67000 km INFINITE TECHNOLOGIES. of backbone DWDM networks G PERFORMANCE DWDM SYSTEMS VOLGA DEVELOPMENT PRODUCTION DESIGN INSTALLATION

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1 INFINITE TECHNOLOGIES km of backbone DWDM networks 400G PERFORMANCE DWDM SYSTEMS VOLGA DEVELOPMENT PRODUCTION DESIGN INSTALLATION

2 OUR ACHIEVEMENTS 100Gbit/sec channel in a 4,250 km fiber optic line Moscow-Novosibirsk without regeneration 2 07/2015. In April 2015, T8 put into operation a 100G channel Moscow Novosibirsk on Volga DWDM equipment without signal regeneration. The 100G channel was implemented in two routes via Samara and via Yekaterinburg, with 1+1 redundancy. The length of two legs of the line is 4,250 km and 3,400 km, respectively. The channels were organized within the existing multiplex DWDM system built on equipment from international manufacturers. Equipment has proved to be efficient, thereby providing a substantial signal/noise margin on OSNR.

3 About the Company... 4 DWDM Equipment Volga DWDM Platform... 6 Cross-connect DWDM Platform Volga G Equipment G Equipment G Equipment G Equipment G Equipment ,5G Equipment and Below EDFA & RAMAN Optical Fiber Amplifiers Hybrid Amplifier EDFA + RAMAN Remote Optically Pumped Amplifier ROPA Optical unit with EADM amplifier Optical Units Vmux Optical Spectrum Analyzer OPM ROADM the Solution for Multichannel Networks DWDM and СWDM Compact Systems 3U Compact Metro DWDM System G DWDM System V1-MS-100E DWDM System 10*10 Gbit/s V1-TT-C10E Irtysh Up to 10 Gbit/s Irtysh Up to 2.5 Gbit/s Network Management System Network Management System NMS Fractal Solution and Services Research and Development Center DWDM Network Designs and calculation Technical Support & Learning Fiber Optic Security System Dunay Distributed Fiber Optic Security System... 31

4 About the Company T8 Technologies of Infinity About the company T8 is the leading manufacturer of wavelength-division multiplexing telecommunication equipment (DWDM and CWDM) in Russia and CIS countries. We develop and manufacture a line of DWDM and CWDM equipment with channel speed up to 400 Gbit/s. The entire T8 equipment is being designed and manufactured in Russia. Company headquarter is located in Moscow; there is a regional representative office in Saint Petersburg. There are over 200 staff members in the company, including 2 Professors and 17 PhDs. 4 The company got short-listed among the Top 10 of Russia most innovative companies according to the TECHUP-2014 rating and among the Top 30 rapidly developing companies according to TECHUP T8 has been a CNEWS AWARDS winner in Russian Technologies nomination. In 2014, the company won a competition of ROSTEC, Russian state corporation in the field of photonics with a project for a new DWDM system. In 2015, the company became the nominee for the «Industry» award. A substantial part of our profit is re-investing to scientific research and development activities that allow us to manufacture world-class CWDM and DWDM equipment. T8 has the own R&D Center, T8 Scientific and Technical Center LLC, which is a resident of the Skolkovo Innovation Center, as well as the bestequipped measurement laboratory in Russia. Every year our specialists publish dozens of scientific articles in Russian and international journals. We obtain patents for new scientific research results year by year. Based on researches performed in our R&D Center, we established several world records in 100 Gbit/s signal transmission: 100G transmission over 4250 km in real Moscow - Novosibirsk DWDM system without dispersion compensator modules (DCM) or signal regeneration; 10x100G transmission over 500 km in a singlespan fiber optic line using of remote optically pumped amplifiers (ROPA) One of direction developing fiber optic products is the Dunay distributed acoustic sensor. The Dunay team has its separate company, T8 SENSOR LLC. The device is intended for monitoring of security zones of long- General Director of T8, Treshchikov Vladimir PhD distance objects: oil and gas pipelines, communication lines, state borders, perimeters of large areas, such as industrial and specialized objects. The development of modern telecom equipment and the implementing of innovative technologies require high professionalism and creative approach of the employees. Not only state-of-the-art technology gurus but also recent graduates work in our company. We have established a school for training and education of young specialists; we select and promote the best graduates of leading Russian universities such as MIPT, MSU, Bauman MSTU, and others. The company has established several telecommunication laboratories in MTUCI and in the Saint Petersburg State University of Telecommunications named after Prof. M.A. Bonch- Bruevich. Training courses for specialists are an opportunity to extend one's knowledge in the area of wavelength division multiplexing technology and to work practically with the telecommunication technologies. T8 offers integrated solutions for building DWDM systems on a turnkey basis: design, supply, installation and maintenance of the equipment. The qualification of the company specialists makes possible to implement projects of any complexity both for regional and backbone DWDM networks. The in-house design department calculates DWDM networks within a short period of time.

5 About the Company The main areas of T8 company activities: Development and manufacture of CWDM and DWDM equipment; Pre-design analysis of fiber optic lines; Development of design concept, calculation and engineering design of networks; Equipment installation; Maintenance and technical support of equipment; Distributed acoustic sensors development; Laser physics and optoelectronics research and development activities. The company has ample technical capabilities permitting to solve any types of tasks that may appear. The vast practical experience in the installation of high-complexity systems in various climatic conditions makes it possible for our specialists to manage the most challenging situations within short time and with high quality. The company has full-time mobile groups of engineers that can provide immediate response to any situation. The high quality of projects implementation is confirmed by positive feedback and references. The company is ISO 9001 certified. 5 We have put in operation over 67,000 km of DWDM lines, and more than 10,000 km of them are high-speed (100 Gbit/s) lines. Communications providers, system integrators, state authorities, data processing centers, plants and factories are among our clients. One of the key customers in Russia is Rostelecom Company. Our customers: The company built a DWDM network for Sochi 2014; part of the network was built using 100G DWDM system Volga

6 DWDM Equipment Volga DWDM Platform Increase your network performance using our high-speed device High-speed multiservice and multiprotocol DWDM platform Volga consists of the range of chassis with different capacities and optimized for various optical network deployments: from compact solutions for density and distance increasing of existing city and regional networks or data center interconnect to organization of high capacity and long-haul transport infrastructure for multiservice optical networks. All chassis of DWDMplatform Volga use common software and hardware, control and monitoring systems, ensuring compatibility, manageability and interchangeability of modules in all product lines. 6 4 chassis types: 10U with 13 slots, 6U with 7 slots, 3U with 3 slots or 1U with 1 slot; Support up to 400G; Optic amplifiers: EDFA, RAMAN and gybrid EDFA+RAMAN; ROADM: WSS 1x1, 1x2, 1x4, 1x9; Redundant AC/DC power supplies: 650, 850, 1200 or 1600W. Powerful DWDM transmission: 40, 80 or 96 channels 100G each, 48 channels 400G Transponders support various line speeds 400 (2x200), 200, 100, 40, 10, 2.5G. The hot upgrade without traffic interruption is possible. Coherent detection and SD- FEC/Soft-FEC in 400G/100/40/10G transponders makes the transmission characteristics of these transponders very solid and enables them to work in old lines together with existed 2,5G channels. Due to high fault-tolerance of 100G DWDM transponder, the transmission on distances of up to 4250 km without dispersion compensators in the line with cascade of amplifiers is possible, as well as the 500 km point-topoint transmission with the use of Remote Optically Pumped Amplifiers (ROPA). The newest 400Gbit/s equipment is intended for the organization of transport infrastructure of data centers and city networks. Space efficiency in the rack A line of different form-factor chassis with 13 slots, 7 slots, 3 slots for the convenience of network construction and subsequent renovation and expansion of channel Versions of the platform «Volga» height 10U, 6U and 3U capacity. Each transponder of the Volga platform is also available in 1U standalone version, including 400 Gbit /s equipment. Flexibility and network protection: OTN, 1+1 and add/drop, ROADM ROADM is a flexible output of optical channels for network protection and upgrade Protection 1+1 at speeds of 2.5, 10G - two line interfaces Aggregators 10x10G, 4x10G, 4x2.5G, 8x1GE BS cards optical protection of expensive interfaces 40G and 100G/400G Modules of the platform support OTN X-connect with capacity of switching matrix of 40 or 100 Gbit/s. The next generation of equipment will support OTN Switch with capacity of up to 1 Tbit/s. DWDM system Volga supports up to 96 channels in C-band and have an option of additional extension in L-band to achieve transmission capacity of up to 27 Tbit/s. All Volga equipment provides a full support of OTN technology. System elements (optical transponders, amplifiers, aggregators, control units or power supplies) can be replaced in a hot mode, i.e. without turning off the equipment and traffic loss. Optical switching cards enable building 1+1 protection networks and ring topology networks.

7 DWDM Equipment The Volga Platform Key Features High channel capacity Transmission of up to 96 DWDM channels, up to 100 Gbit/s each or 48 up to 400Gbit/s. Up to 270 channels in expanded C+L band. Client interfaces SDH, OTN, Ethernet: 400G: 100GE, 150GE, 200GE 100G: 100GE 40G: STM256, OTU3, 40G Ethernet 10G: 10GbE, STM64, OTU2, 4/8/10GFC 2,5G: GbE, STM1/4/16, OTU1 OTN technology support Transponders and muxponders-aggregators transfer traffic in the OTN OTU1/2/3/4 format. OTN capacity matrix: 40 or 100 Gbit/s. Next generation will support OTN-matrix up to 1Tbit/s. Support FEC: Soft-FEC, Super- FEC and SD-FEC error correction algorithms increase the signal transmission quality. Implementation of complex topologies Due to using of WSS ROADM 1x2, 1x4, 1x9 and different types of aggregators and path-protection cards the Volga platform perfectly fits for constructing different topologies DWDM networks: with 1+1 protection, both ring and mesh. High speed optical end electronic switches, powerful digital signal processor in 100G transponders make possible to build redundant links with very fast reconfiguration (<50 ms) in case of failure. Wide range of optical amplifiers Low-noise erbium-doped fiber amplifiers (EDFA), Raman amplifiers (RAMAN) with a power of up to 33 dbm, remote optically pumped amplifiers (ROPA), hybrid amplifiers EDFA + RAMAN. Fractal network management system Enables control and management of all nodes at the network map with a color-coded indication. The graphical framework Fractal and the built-in Webserver significantly simplify operations on remote configuring of the Volga platform. Dimensions and power consumption Doubled power units: DC or AC 220 V 50Hz. Power consumption is not more than 1200 W. Chassis height 1/3/6U and 10U, depth 300 mm, rack mounting in 19 and 21 inch racks. Cross-Connect DWDM Platform Volga The first Russian OTN cross-connector Volga performs digital switching of ODU0/1/2/3/4 streams in nonblocking mode with a total capacity of up to 900 Gbit/s. OTN cross-switch is in development. OTN cross-connector provides telecom operator with a powerful tool for remote management of client traffic allocation over transport optical channels. With the OTN cross-connection, each client port is no more linked permanently to a particular transport channel (as in the muxponder): client traffic can be switched manually to any line interface using the management system, or switched automatically depending on the current load of transport channels. Efficient use of the huge bandwidth of the upcoming super-channels (500G, 1T) is possible only with the use of OTN cross-connectors with digital switching matrix. New cross-connector Volga will help telecom operators to achieve new level of network control and provide unmatched management flexibility. full support The cross-switch Volga Up to 900 Gbit/s in one chassis (10U size) 2 control and intercommunication units 4 slots for power supplies 1600 W Power consumption 3200 W Flexibility and Network Protection Supports 1+1 redundancy for crossconnector card, 2+2 for power supply units, and 1+1 for control unit. 7 Technical characteristics of Volga cross-connector: Up to 9 cards of two types in any combination: 10x10G client card and 100G line card 1 or 2 cross-connection cards ROADM Capability Reconfigurable optical add-drop multiplexers (ROADMs) can be used for management of separate wavelengths in DWDM network, for example, for their redirection to one or another route.

8 400G Equipment Aggregating Transponder MS-400E Transmits 4x100 Gbit/s client signals in two subcarriers DWDM channel 2xDP-16QAM Transmits up to 4 client signals 100GE ( Gbps) or OTU4 RS FEC ( Gbps) SD-FEC 15% and 25% error correction algorithm Reconfigurable in C-band laser 2xDP-16QAM Line interface/flex rate 8 Aggregating transponder (muxponder) combines 4x100 Gbit/s client channels and transmits them in a two DWDM channels. The MS-400E, converts data into the OTN format and uses the new coherent SD- FEC error correction.the laser with a reconfigurable according to ITU-T 100 GHz enables organizing up to 48 DWDM channels 400G within the C-band according to ITU-T 100 GHz. Transponder supports both differential phase and absolute phase for all the modulation formats. Supports two individual line-side channels and each channel can be programmed to 100G PM-QPSK, 150G PM-8QAM and 200G PM-16QAM for optimization of reach versus capacity. Line Out 1 λ 1 Line In 1 Line Out 2 λ 2 Line In 2 Optical Characteristics Parameter Value Line interface, line bit rate / payload (1 or 2) x 100 Gbit/s (1 or 2) x 150 Gbit/s 2 x 200 Gbit/s Client signals (1 or 2) x 100 GE 3 x 100 GE (1, 2, 3 or 4) x 100 GE Operational wavelength range of a transmitter nm Receiver overload (BER=10-12 ) 0 dbm Receiver sensitivity (BER=10-12 ) -18 dbm Output power with an optical amplifier dbm OSNR T (0.1 nm, BER=10-12 ) 10,2 db 14,7 db 18,1 db Modulation 25% OH SD-FEC DP-QPSK DP-8QAM DP-16QAM Automatic dispersion correction up to ± 70 ns/nm ± 30 ns/nm ± 30 ns/nm Power consumption 150 W

9 200G Equipment Aggregating Transponder MS-200E Transmits up to 20 x 10 Gbit/s client signals in channel 200 Gbit/s Transmits up to 20 client: 10GE, STM-64, OTU2, 8/10 GFC Soft-FEC 20% error correction algorithm Coherent DP-16QAM, DP-QPSK modulation format Reconfigurable in C-band laser Automatic dispersion correction up to ± ps/nm OSNR T from 11,6 дб (0,1 nm, BER = ) Aggregating transponder (muksponder) transmits client channels to one OTU-4 DWDM channel. MS-200E transmits data in OTN format using Soft-FEC error correction of 20%. Supports differential and absolute phase modulation format for all modes of operation. Supports the transfer of channels in 200G mode DP- 16QAM, 100G DP-QPSK. 9 Optical Characteristics Parameter MS-200E-T10 MS-200E-Т20 Line interface, line bit rate / payload OTU4, 100 / OTUC2, 100 / max 10 x 10 Gbps max 20 x 10 Gbps Client signals 10GE, STM-64, OTU2, 8/10 GFC Output power dbm Operational wavelength range of a transmitter 1528,7 1567,1 nm Receiver sensitivity (BER=10-12 ) -18 dbm Receiver overload (BER=10-12 ) 0 dbm Automatic dispersion correction up to до ± 55 ns/nm OSNR T (0,1 нм, BER=10-12 ) c Soft-FEC 20% 11,6 db 12,5 db 18 db Service channel yes Power consumption 170 W 200 W

10 100G Equipment Оборудование DWD Transponder ТS-100E Transmits 100GE client signals in 100 Gbit/s DWDM channel with Soft-FEC Transmits 100 Gigabit Ethernet client signals Supports 100G clients protocol L4 (4x25G) and SR10 (10x10G) OTU4 line interface, 120 Gbit/s Coherent DP-QPSK modulation format Reconfigurable in C-band laser Up to 96 channels in accordance with 50 GHz wavelength channel plan 15% Soft-FEC error correction algorithms Automatic dispersion correction up to ± ps/nm OSNR T from 11 db (0.1 nm, BER = ) 10 TS-100E transponder executes 3R regeneration and transforming of 100 Gbit/s 100 Gigabit Ethernet client signal into an OTN, transmits data into a line using the OTN OTU4 format and uses powerful Soft-FEC error correction algorithms. Data transmission is executed at a stabilized wavelength according to a DWDM grid. The reconfigurable laser enables organizing up to 96 DWDM channels within the C-band according to ITU-T 50 GHz. Client In 100GE Client Out CFP 3R OTN FEC Coherent Line Out OTU4 Line In Optical Characteristics Parameter Line interface, line bit rate / payload Output power with an optical amplifier Operational wavelength range of a transmitter Value OTU4, 120 / 103 Gbit/s dbm nm Receiver sensitivity (BER=10-12 ) -18 dbm Receiver overload (BER=10-12 ) 0 dbm OSNR T (0.1 nm, BER=10-12 ) 11,5 db (Soft-FEC 20%) 12,5 db (Soft-FEC 15%) Power consumption 150 W

11 M 100G Equipment Aggregating Transponder MS-100E Оборудо Transmits 10x10 Gbit/s client signals in 100 Gbit/s DWDM channel with Soft-FEC Transmits 10 client signals of 10GE, STM-64, OTU2, 8/10 GFC Service channel ESC in line interface Soft-FEC 15% error correction algorithm Coherent DP-QPSK modulation format Automatic dispersion correction up to ± ps/nm OSNR T from 11 db (0.1 nm, BER = ) The unit is certified by Aggregating transponder (muxponder) combines 10x10 Gbit/s client channels and transmits them in a DWDM channel. The MS-100E-T10 executes 3R regeneration, converts data into the OTN OTU4 format and uses the powerful Soft-FEC error correction algorithm.the transponder transfers data at a stabilized according to ITU-T 50 GHz according to the DWDM grid. The laser with a reconfigurable according to ITU-T 50 GHz enables organizing up to 96 DWDM channels within the C-band according to ITU-T 50 GHz. MS-100E-T10 is certified by BROCADE, for more information, visit the company's website. 11 Optical Characteristics Parameter MS-100E-T10 MS-100E-Т10-SH Line interface, line bit rate / payload OTU4, 120 / 10x10 Gbit/s Client interfaces standards 10GE, STM-64, OTU2, 8/10 GFC Output power dbm dbm Operational wavelength range of the transmitter nm Receiver sensitivity (BER=10-12) -18 dbm -21 dbm Receiver overload (BER=10-12) 0 dbm -2 dbm Automatic dispersion correction up to ± 70/125 ns/nm up to ± 40 ns/nm 11 db (Soft-FEC 20%) OSNR T (0,1 nm, BER=10-12) 12.5 db (Soft-FEC 15%) 13.3 db (Soft-FEC 15%) Service channel optional - Power consumption 165 W 100 W

12 40G Equipment 40 Gbit/s Transponder & Muxponder Transmits 40 Gbit/s client signals via DWDM channel with Super-FEC OTU3 line interface, 43 Gbit/s Super-FEC G.975 I.7 error correction algorithm Coherent DP-QPSK modulation format Reconfigurable in C-band laser Up to 88 channels in accordance with 50 GHz wavelength channel plan Automatic correction dispersion up to ± ps / nm OSNR T = 9.0 db (0.1 nm, BER = ) 12 Transponder executes 3R regeneration and transforming of a 40 Gbit/s SDH STM-256 client signal into an OTN, transmits data using the OTN OTU3 format (43 Gbit/s). Aggregating transponder (muxponder) combines 4x10 Gbit/s client channels and transmits them into a DWDM channel. In any of the 4 channels change the type of client load can be non-stop line of traffic. Client In STM-64 Client Out Client In 1 10GE, STM-64, OTU2 Client Out 1 XFP DFB OTN FEC Coherent Line Out OTU3 Line In D Equipment executes 3R regeneration, and uses the powerful Super-FEC G.975 I.7 error correction algorithm. Data transmission is executed at a stabilized wavelength according to a DWDM grid. The laser with a reconfigurable wave length enables organizing up to 96 DWDM channels with the C-band ITU 50-GHz wavelength channel plan. Client In 2 10GE, STM-64, OTU2 Client Out 2 Client In 3 10GE, STM-64, OTU2 Client Out 3 Client In 4 10GE, STM-64, OTU2 Client Out 4 XFP DFB XFP DFB XFP DFB OTN FEC DWDM Line Out OTU3 Line In Optical Characteristics Parameter TS-40E MS-40E Client signals STM-256, 40GE 4 x ( 10GE, STM-64, OTU2, 8/10GFC) Line bit rate OTU3, 43 Gbit/s Output power without an optical amplifier dbm Operational wavelength range of a transmitter nm Receiver sensitivity (BER=10-12) -20 dbm Receiver overload (BER=10-12) 0 dbm Power consumption 100 W

13 10G Equipment Transmits client signals of 10GE, SDH STM-64, 8/10 GFC Line interface OTN OTU2 10 transponders on the 10G in a single unit Super-FEC G.975 I.7 error correction algorithm Line and client interfaces SFP+ Client In 1 10GE, STM-64, 8GFC/10GFC Transponder ТT-C10E 10 transponders 10 Gbit/s with Super-FEC and OTN X-connect full support 10-channel 10G transponder with Super-FEC supports any 10 Gbit/s data formats on client interfaces: 10 GE, STM-64 etc. Each client channel is converted in OTN OTU2 format and sent to the selected line port. All channels on the line side can be combined by an external multiplexer for transmission in a single fiber using CWDM or DWDM technology. Tunable SFP+ or color SFP/SFP+ with a fixed wavelength can be used on each line port. The use of standard SFP+ connectors significantly increases the cost-efficiency of the solution. High port density enables effective usage of the rack space. The device can be configures in 5-channel mode with a line redundancy 1+1. In this case each client channel is sent to two line ports: main and backup. These two line channels bearing the same client channel can be transmitted on different fibers or with OTN X-connect between the channels. The transponder supports Super-FEC error correction that guarantees a high quality of 10G signal. Equipment Client Out 1 Client In 2 10GE, STM-64, 8GFC/10GFC Client Out 2... Client In 10 10GE, STM-64, 8GFC/10GFC Client Out 10 SFP+ SFP+... SFP+ TT-10E OTN Super FEC X- Connect DFB SFP+ DFB SFP+ DFB SFP+ DWDM Line Out 1 OTU2 λ 1 Line In 1 Line Out 2 OTU2 λ 2 Line In 2 Line Out 10 OTU2 λ 10 Line In 10 is fully compatible with OTN networks. OTN provides powerful capabilities for channel management, signal monitoring, and traffic statistic analysis. 13 Optical Characteristics Parameter Value Line bit rate OTU2, 10 Gbit/s Output power without an optical amplifier dbm * Quantity SFP/SFP+ 10 Operational wavelength range of a transmitter nm Receiver sensitivity (BER=10-12 ) -24 dbm * Receiver overload (BER=10-12 ) -7 dbm * Power consumption 80 W *Depending on the type SFP+

14 10G Equipment Transponder TD-10E Transmits 10 Gbit/s client signals in DWDM channel with Super-FEC Transmits 1/2 client signals of 10GE, STM-64, OTU2, 4/8 GFC OTN OTU2 line interface Super-FEC G.975. I.7 with a redundancy up to 25% or FEC G protection for linear and ring DWDM systems Reconfigurable in C-band laser Up to 88 channels in accordance with 50 GHz wavelength channel plan OSNR T = 9.0 db (0.1 nm, BER = ) 14 Dual TD-10E transponder executes 3R regeneration of a 10 Gbit/s client optical signal and transforms a wavelength into an optical DWDM channel. Reconfigurable in C-band laser can be used for organization of up to 96 DWDM channels in accordance with the 50 GHz wavelength channel plan. The FEC version corrects errors according to FEC G.709 or Super-FEC ITU G.975 I.7 standards. Client In 1 10GE, STM-64, OTU2 Client Out 1 Client In 2 10GE, STM-64, OTU2 Client Out 2 XFP XFP OTN FEC Line Out 1 OTU2 Line In 1 DWDM Line Out 2 OTU2 Line In 2 Optical Characteristics Parameter TD-10 TD-10F TD-10E Line bit rate OTU-2, from Gbit/s Client interfaces standards 10GE, STM-64, OTU2 Output power <+4 dbm Operational wavelength range of the transmitter nm Receiver sensitivity -18 /- 24 dbm * Receiver overload dbm Error correction algorithm none FEC G.709 SuperFEC ITU G.975 I.7 Power consumption 45 W * Specifying in order

15 10G Equipment Aggregator MS-DC10FXP Transmits up to 8 client signals in OTU2 channel with FEC and OTN X-connect full support Transmits client signals of GE and SDH STM-1/4/16, OTU1 2 lines interfaces OTN OTU2, 10 Gbit/s Error correction algorithm G.709 Aggregates 4xSTM-16, 8xSTM 1/4, 4xOTU1, 8xGE or multipurpose channels up to 10 Gbit/s OTN X-connect matrix from 40 Gbit/s 2 lines outputs DWDM XFP and SFP+ or reconfigurable in C-band laser (MSA) Up to 88 channels in accordance with 50 GHz wavelength channel plan Aggregator MS-DC10FX combines 8 client channels Gigabit Ethernet, SDH STM-16 (or their arbitrary combination) in two line channels OTN OTU2, 10 Gbit/s. The device supports cross-commutation on the ODU0/ ODU1 level. Aggregator performs 3R-regeneration of the signal, and error correction according to G.709. Two types of line interfaces are supported: XFP-modules and tunable lasers. Client In 1 GE, OTU1 STM-1/4/16 Client Out 1 Client In 2 GE, OTU1 STM-1/4/16 Client Out 2... SFP DFB SFP DFB... OTN FEC X- Connect DFB XFP DFB XFP DWDM Line Out 1 OTU2 λ 1 Line In 1 Line Out 2 OTU2 λ 2 Line In 2 15 Client In 8 GE, OTU1 STM-1/4/16 Client Out 8 SFP DFB Optical Characteristics Parameter MS-DC10FXP-Q3F MS-DC10F-Q3F Line bit rate 2xOUT2, 10.7 Gbit/s Interface type XFP, SFP+ MSA Quantity client interfaces 4/8 Client interfaces standards 4 x (STM-16/OTU1) или 8 х (GbE/STM-1/STM-4) Output power defined by XFP < +4 dbm Operational wavelength range of the transmitter nm Receiver sensitivity / -24 dbm Receiver overload dbm Power consumption 45 W

16 2,5G Equipment and Below 2,5 Gbit/s Transponder & Aggregator 4 transponders up to 2,67 Gbit/s in DWDM channel with Super-FEC Useful for organizing 1+1 and ring protection Super-FEC G.975 I.3 or FEC G.709 error correction algorithm OTN OTU1 line interface OSNR T = 7.0 db (0.1 nm, BER = ) Aggregator MD-D3ES transmits 1 client channel STM- 16, or combines 2 client channels GE, STM-1/4 in a line channel OTN OTU1. The aggregator performs 3R-regeneration of the signal, and error correction according to G.709 or G.975 I.3 (Super-FEC). Two aggregators are combined in a single card. 16 TQ-3ES transponder executes 3R regeneration of a 10 Gbit/s client optical signal and transforms a wavelength into an optical DWDM channel. Reconfigurable in C-band laser with the 50 GHz wavelength channel plan. The FEC version corrects errors according to FEC G.709 or Super-FEC ITU G.975 I.3 standards. SFP module is used as a line interface of the aggregator. DWDM SFP can be used for data transmission in DWDM network. Aggregator MD-D3ES Optical Characteristics Parameter TQ-3ES MD-D3ES Line bit rate 2,67 Gbit/s, OTU1 2 х (STM16,FC200) or 4 х (GE, STM- Client interfaces standards 4 х (GE, STM-1/4/16) 1/4), and any combination Error correction algorithm Super-FEC G.975 I.3 or FEC G.709 Operational wavelength range of a transmitter 1528,7 1567,1 nm Power consumption 25 W 30 W

17 2,5G Equipment and Below Aggregator STM1-21E1 Transmits up to 21 E1 client interface in STM-1 channel Transfer client signals E1 STM-1 Line Interface Internal or external synchronization The E1 channel aggregator STM1-21E1 is designed for receiving / transmitting twenty-one streams in E1 format (2048 Kbit / s) from / to the SDH transport network of the STM-1 level. Each port of the device works in fullduplex mode. The client E1 channels are connected to the device via RJ-45 connectors. The signals can be synchronized with two inputs (2048 khz) and two outputs (2048 khz), in accordance with G.703 / Optical Characteristics Parameter Value Line bit rate STM-1 Standarts of client interfaces E1 (2048 Kbit/s) Quantity client interfaces 21 Operational wavelength range of a transmitter nm Power consumption 20 W

18 Optical Amplifiers EDFA & RAMAN Optical Fiber Amplifiers The optical amplifiers family includes preamplifiers, boosters and linear erbium doped amplifiers (EA), and also Raman amplifiers (RA) with power up to 2 W 1 and 2 cascaded amplifiers Controls transient processes when adding channels Low noise figure Flat amplifying grid in C-band Raman amplifiers with pump power up to 2 W (33 dbm) Stabilization modes for an output power and amplification factor 18 Amplifiers increase the power of optical signals without an optical-to-electrical transduction. Amplifiers with one, two or three amplification stages are available. In multi-stage amplifiers, inter-stage access if provided for connection of dispersion compensators. The use of gain flattening filters (GFFs) guarantees a flat gain grid in С-band. Each amplifier has a built-in tunable attenuator that enables smooth gain adjustment. K1 K2 EDFA DWDM In EDF GFF VOA EDF EDF GFF % 1% 1% 1% 1% Out DWDM ФП1 ДН1 ДН2 ФП2 ФП3 ДН3 Out2 In2 ФП4 MON In Out DCU Optical Characteristics Parameter RA EA Spectral range nm Output power +30 dbm (RAMAN) dbm Number of amplifying stages Number of leveling GFF filters Spectral flatness per 10 db of amplification - 0,5 db Power adjustment range with an attenuator ; ; 25-36

19 Optical Amplifiers Hybrid Amplifier EDFA + RAMAN Combination of Raman and erbium-doped fiber amplifier in one case EDFA + RAMAN in one case High spectral flatness Low noise figure Hybrid amplifier is a combination of Raman amplifier and erbium-doped fiber amplifier (EDFA). Raman pumping with the power of up to 600 mw amplifies the emission in the line before its input to EDFA and decrease an effective noise factor of the amplifier. Due to lower noise factor it is possible to achieve larger distances between amplifiers and decrease network operating costs. Interstage access for connection of dispersion compensators can be optionally provided. DWDM In Signal Counter pumping Pump1 WDM λ 1 MUX EDFA λ 2 Pump2 Signal Out DWDM 19 Remote Optically Pumped Amplifier ROPA Increase of spans between two network nodes due to remote amplification of signal The use of ROPAs makes it possible to increase the distance between two network nodes. The ROPA is an erbium-doped fiber amplifier that is pumped remotely using wavelength 1480 nm either in working fiber or in an additional fiber. The device consists of two functional units: a passive unit (hermetically sealed box with a fiber-optic circuit) and an active unit (one or two pumping lasers). Two types of ROPA configuration are used: with a backward pumping (i.e. the pumping is provided from the receiver side) and with a forward pumping (i.e. the pumping is provided from the transmitter side). Working modes of amplifiers and the gain in distance can vary in different configurations, and depend on the required link capacity. The application of the ROPA scheme for a span of 500 km

20 DWDM Equipment Оборудование DWDОб Optical unit with EADM amplifier Aggregation, dispersion compensation and amplification in one unit Managed multiplexer / demultiplexer up to 16 channels Optional built-in amplifier, preamplifier and dispersion compensator Adjustment step of attenuator 0.1 db Transmission range up to 90 km (SH), up to 150 km (LH), up to 230 km (ULH) The optical unit provides multiplexing of 16 channels in an optical fiber and their demultiplexing in the return channel, and also (optionally) their amplification and dispersion compensation. 20 When combined with a 10-channel 10G transponder TT- C10E, the unit allows to build a wide range of economical DWDM or CWDM-systems with transmission range up to 230 km along a pair of optical fibers. There are three variants of the block layout: Without amplifiers (SH-short haul): A multiplexer in the forward channel; A demultiplexer in the reverse channel; With one amplifier (LH-long haul): A multiplexer in the forward channel; Amplifier, dispersion compensator and demultiplexer in the return channel; With two amplifiers (ULH-ultra long haul): Multiplexer and amplifier in a forward channel; Amplifier, dispersion compensator and demultiplexer in the return channel. The range calculation is performed for the following characteristics of the fiber: attenuation 0.22 db / km, dispersion 19 ps / nm / km. Short distances of up to 90 km The average distances are km Large spans km

21 Mорудование DWDM DWDM Equipment Optical Units Vmux Variable optical multiplexer and demultiplexer Managed multiplexer / demultiplexer Step size 0.1 db attenuator Controls transient processes when adding channels Low noise figure Flat amplifying grid in C-band Units are designed to combine separate DWDM channels in one multi-channel line DWDM signal (multiplexer) or to extract separate DWDM channels from a multi-channel line DWDM signal (demultiplexer). Optical power in each channel can be adjusted using built-in optical attenuator. Attenuation value for each channel can be managed using a network management system (NMS). Units support up to 40 or 48 channels. Optical Spectrum Analyzer OPM Measurements of the spectra in DWDM systems 21 C-band nm Frequency grid 50 GHz 4-lines optical switch The unit performs spectrum measurement for signal rates 2.5 Gbit/s (direct and external modulation), 10G, 40G and 100G (with limitations). Channel optical power can be measured in the range dbm. Noise floor is -55 dbm. The unit is managed using a web interface that displays the spectrum of multi-channel optical signal and a list of channel powers for different formats of modulation. The unit is designed for use in the Volga chassis.

22 DWDM Equipment ROADM the Solution for Multichannel Networks Versatile add/drop of lightpath channels for the network upgrade and protection Reconfigurable multiplexers ROADM-x/1 (x=2, 4,9) are intended for flexible routing and cross-connect of optical channels on core network nodes. Multiplexers ROADM- 1T/40C enables you to extract several optical channels from input DWDM signal, and to add client channels into output DWDM signal. Multiplexers ROADM-x/1 (x=2,4,9) enables you to extract arbitrary channels from 2, 4, or 9 input DWDM signals and combine them into one output DWDM signal. An optical equalizer has one DWDM input port and one DWDM output port. An output signal power in each multiplexer can be tuned channelby-channel in the Network Management System (NMS) using internal attenuators. All ROADM units support the WSS redundancy that allows you to reconfigure the path of optical channel when receiving the control signal. This technology allows you to provide redundancy for high bit-rate channels 100G and 40G at a minimal cost. The reconfiguration of the route takes less than 40 sec. Functional Diagram 22 Optical Characteristics ROADM parameter 1/1 CA 2/1 4/1 9/1 Span between channels 50Ghz Number of input / output channels 96/96 96 x 2/96 96 x 4/96 96 x 9/96 Frequency band Thz Thz Channel loss ( Line in / Line out ) 6.5 db 6.5 db 7.5 db Channel loss ( add ) 6.5 db 6.5 db 7.5 db Channel loss ( drop ) --- Channel loss ( blocked ) 40 db Tuning range of attenuator 15 db Tuning step of attenuator 0.1 db Time of channel switch 250 ms Time of attenuator switch 50 ms Power consumption 10W

23 Compact Systems 3U Compact Metro DWDM System 16 channels universal compact solution Volga Metro Compact System Volga Metro is solution for regional and metro networks using DWDM or CWDM technologies. Main load is 10x10Gbit/s also you can use 100G or 400G. The system provides the ability operator to organize the traffic at distances up to 230 km with 16 channels up to 10 Gbit/s each. Equipment Volga fully supports OTN technology. The system is controlled by the built-in EMS management system. Compact solution Volga Metro with three slots: Expansion Slot Optical Slot Transponder Slot Slot TT-S10E fully supports the OTN Cross-Connect Matrix up to 40 Gbit/s. Tunable SFP+ or color SFP+ with a fixed wavelength can be used on each line port. Expansion Slot : can remain free and be used to increase the System capacity. For example in the Expansion Slot can be set the Transponder Unit MS100G, TQ-3ES or Aggregator Unit MD-D3ES to organize backup or expansion the System up to 16 channels. Optical Slot: provides multiplexing multiplexes the 16 channels in a optical fiber and their demultiplexing in a return channel; and (optionally) its amplification and dispersion compensation. The chassis has two types of a redundant power supply: DC V or AC 220 V. The chassis has height of 3U and depth of 300 mm for installation in a standard rack 19/21''. The System is controlled by a built-in element management system EMS. The control unit allows you to organize the service channels at the operating wavelength. System configuration options - Chassis - Block Ural - Unit TT-10E (10x10G) - Free slot - Chassis - Block Ural - Unit TT-10E (10x10G) - Block TQ-3ES (4x2.5G) 23 Transponder Slot: transponder TT-C10E supports 10x Client signals in such formats as Ethernet, SDH,and Fiber Channel with flows up to 10 Gbit/s. Due to Forward error correction function Super-FEC the System provides a high-quality signal over long distances. Transponder - Chassis - Block Ural - Unit TT-10E (10x10G) - Block MS-100E (100G) Standard Configuration Parameter Basic Low-speed channels Extension 100G Linear interface OTU2 OTU1, OTU2 OTU1, OTU2, OTU4 Operational wavelength range of the transmitter 1528,7 1567,1 nm Client ports SFP / SFP Power consumption up to 285 W 310 W 450 W Control system Built-in EMS

24 Compact Systems Compact 100G DWDM System V1-MS-100E Transmission of 10 client signals 10 Gbit/s each in a DWDM channel 100 Gbit/s with Soft-FEC Transmission of 10 client signals 10GE, STM-64, OTU2, 8/10 GFC Line interface OTU4, 120 Gbit/s Error correction Soft-FEC Coherent modulation format DP-QPSK Automatic dispersion compensation up to ps/nm OSNRR = 12.5 db (0.1 nm, BER=10-12 ) System V1-MS-100E-T10 aggregates 10 client interfaces 10 Gbit/s and transmits them into a single 100G DWDM channel. The traffic protocol on 10G client ports can be changed without interruption of the line traffic. Muxponder performs 3R-regeneration of the signal, converts data to OTN OTU4 format and implements Soft- FEC error correction. A stabilized wavelength is used for data transmission in accordance with standard DWDM grid. The laser can be tuned across the C-band to cover any of up to 96 channels (with 50 GHz spacing). The system has an Ethernet port that enables to arrange service channel on a working wavelength. The device consists of: channel-forming DWDM unit, control unit, two power supply units, and fans unit. Specifications Linear interface, the transmission speed in the line OTU4, 120/103 Gbit / s Input power dbm Receiver Sensitivity (BER = ) -18 dbm Receiver overload (BER = ) 0 dbm OSNRT (0.1 nm, BER = ) 12.5 db Power consumption is not more than 235 W 24 Compact DWDM System 10x10 Gbit/s V1-TT-C10E Transmission of 10 client signals 10 Gbit/s with Super-FEC and OTN X-Connect Transmission of 10 client signals 10GE, SDH STM-64, 8/10 GFC Line interface OTU2 Up to ten transponders, up to 10G each Super-FEC G.975 I.7 error correction algorithm Lines and clients interfaces SFP+ ESC control channel at a separate wavelength Compact standalone unit 1U, 19 Compact system for transmission of 10 Gbit/s signals with Super-FEC. The system supports any 10 Gbit/s data formats on client interfaces: 10 GE, STM-64 etc. Each client channel is converted in OTN OTU2 format and sent to the selected line port. All channels on the line side can be combined by an external multiplexer for transmission in a single fiber using CWDM or DWDM technology. Tunable SFP+ or color SFP/SFP+ with a fixed wavelength can be used on each line port. The use of standard SFP+ connectors significantly increases the cost-efficiency of the solution. High port density enables effective usage of the rack space. The device can be full support configures in 5-channel mode with a line redundancy 1+1. In this case each client channel is sent to two line ports: main and backup. These two line channels bearing the same client channel can be transmitted on different fibers or with OTN X-connect between the channels. The transponder supports Super-FEC error correction that guarantees a high quality of 10G signal. Equipment is fully compatible with OTN networks. OTN provides powerful capabilities for channel management, signal monitoring, and traffic statistic analysis. Specifications* Linear interface, transmission speed OTU2, 10 Gbit / s Number of client SFP / SFP + 10 Power consumption no more than 155 W * Receiver parameters depend on SFP +

25 Compact Systems Irtysh Compact CWDM System Up to 10 Gbit/s The best solution for organizing cost-effective speed channel Client interfaces STM-64, 10GE, OTU2, (Fiber Channel 1/2/4/8/10 GFC option) and STM- 1/4/16, GE, OTU1 Built-in CWDM MUX / DEMUX Possibility of line reservation Up to 8 CWDM channels: 2x10G + 6x2.5G; 4x10G; 8x10G Redundancy of power supplies Power consumption 60 W Optical control channel Compact housing 1U, 19 «The Irtish allows organizing up to 8 CWDM channels in 2 directions. The equipment executes 3R regeneration of a signal, transforms it into spectral channels which are combined into a baseband CWDM signal by a builtin optical multiplexer. All the optical connections with a multiplexer are done inside the unit; this increases its reliability and usability. Specifications Number of optical channels: 8 Path redundancy Transmission length: 40 or 60 km Doubled power units: V DC, power consumption 60 W Network management system: SMNP, Fractal Built-in Ethernet Switch, 2 x SFP GE, 6 x RJ-45 Fast Ethernet Irtysh Compact CWDM System Up to 2.5 Gbit/s 25 Increases a fiber-optic communication line bandwidth using Coarse Wavelength-Division Multiplexing technology Client interfaces STM-1/4/16, GE, OTU1, connection of client interfaces with proprietary protocols at speeds up to 2.5 Gbit / s Built-in CWDM MUX / DEMUX Up to 8 CWDM channels, when cascading up to 16 Redundancy of power supplies Optical control channel Compact housing 1U, 19' The Irtysh system allows transmitting client signals up to 8 CWDM channels. The equipment executes 3R regeneration of a signal, transforms it into spectral channels which are combined into a baseband CWDM signal by a built-in optical multiplexer. Specifications Number of optical channels: 4, 8 Transmission length: 60, 80 or 120 km Doubled power units: V DC, power consumption 60 W Network management: SMNP, Fractal Built-in Ethernet Switch 2xSFP GE, 6xRJ-45 Fast Ethernet

26 Network Management System Ра Network Management System NMS Fractal 26 The optical network management system NMS Fractal is a multi-user, multi-level control environment, and is intended for operation control and monitoring of digital transport systems PreOTN, OTN, including DWDM, CWDM. «Fractal» provides network configuration management, monitoring and management of troubleshooting, quality management and security management, as well as logging. Flexible filter settings allow you to quickly and accurately analyze the operation of the system and identify pre-emergency situations in the early stages. Thus, the level of equipment management is combined with the elements of the network management layer. NMS supports the following main functions: Configuration management Setting the parameters of network elements, including the input of passive network elements that do not have electronic identification elements (microcontrollers); Synchronization of NMS databases and network element for all supported types and versions of network elements; Collection of identification information about the elements of the network; Graphical representation of sections (bayface layout), installed boards and devices, as well as their technical state, including color indication of the emergency state of connections, both optical levels of OTN (channels, multiplex sections, etc.) and electrical levels of OTN (OTU1-4, ODU0-4); Troubleshooting control and management Providing information about faults and changes in the status of monitored network elements ( 1 min); Maintenance of detailed fault logs; Support of sensors for monitoring and control of external alarm at the facility; Notification by , as well as audible warning of the operator when a fault occurs; Control of health monitoring modes and the receipt of emergency and other messages from network elements, blocks and I / O ports (including «masking» and changing the category of alarm); Quality management Activation/deactivation of quality parameters measurement for network elements and sections; Maintenance of a detailed system log of quality parameters on VC, MS, RS, and OTU (FEC) levels with an option to print all available information or to save it on an external storage. Integrated element manager (EMS). Operation of a Volga chassis Principal scheme of the network is displayed Security management Identification and authentication of the user, as well as the demarcation of access rights based on the role model; Domain organization of network elements; Logging and passive audit; Control the integrity and security of stored and transmitted information; Scalability NMS Fractal is implemented according to the «clientserver» architecture in the Windows environment (Microsoft SQL Server is additionally required) and can be delivered in the following variants, differing in the management structure: Management of a single administrative domain: «Standard» - up to 400 network elements, «Extended» - more than 400 network elements, monitoring the integrity and security of stored and transmitted information; Management of many distributed administrative domains, with a central management node. The maximum number of domains is up to 100.

27 зработка и проектирование Solutions and Services Research and Development Center The biggest Russian competence center for fiber optics The T8 research laboratory was established in The laboratory of the T8 Scientific and Technical Center carries out research in the field of laser physics and optical science. The T8 Scientific and Technical Center is a resident of the Skolkovo Innovation Center. Telecommunications field is a priority for the laboratory. The majority of research is done for T8, but the center also carries out research and development as a commercial service. Long-distance data transmission is a priority research and development area. The T8 Scientific and Technical Center measurement laboratory is equipped with state-of-the-art tools and is the largest in Russia. More than 200 devices are available for performing experiments and research on optical effects. The key scientific developments of the laboratory are covered with patents. The Center keeps working to reduce the dependence on imported components. The 100G optical module based on discreet elements has been completed. This module is to be the heart of the next-generation system. At that, the use of Russian-made 100G module instead of foreign analogues is an important step towards the further development of the Russian optical telecommunication systems. 27 One of the critical areas of the center research is development of a platform supporting up to 40 Tbit/s per single fiber. In order to implement the project, the team is working on technical solutions for transmission of up to 400 channels in a 25 GHz grid. In addition, the developing of a 1-Tbit/s bandwidth DWDM platform with OTN cross-connect is continuing actively. Transponders and aggregators with OTN cross-connect matrix with a capacity of 40 Gbit/s are already available for customers. All equipment being developed is fully compatible with the Volga platform. T8 Scientific and Technical Center specialists regularly participate in scientific conferences and publish articles in leading Russian and international scientific journals. Scientific articles of our specialists are available on our T8 website. The Scientific and Technical Center T8 has completed the development of a high-speed dense wavelength division multiplexing platform with total bandwidth of 27 Tbit/s.

28 Solutions and Services DWDM Network Designs and Calculation Engineering department of the company performs calculation of DWDM networks of any complexity in short terms. Our engineers calculate more than 200 projects every year, and dozens of them reach the practical implementation stage. Based on initial data provided by customer (scheme of the network and distances between nodes, type and quantity of fibers on each span, plans of the network development) the engineering department solves the following tasks: Development of a channelizing scheme and a principal scheme of the network Calculation of estimated quality of transmission in designed communication channels, and network reliability analysis; Optimization of networks to decrease capital and operating expenses. We have a profound experience in designing telecommunication systems based on new formats of modulation of the optical signal. We developed methods of optimization that make it possible to achieve optimal performance for combined networks where both coherent channels 100/200 Gbit/s and noncoherent channels 10 Gbit/s are transmitted simultaneously. Due to this our customers successfully put in operation 100G channels on an old infrastructure that was intended for 10G channels. We use self-engineered specialized software for most effective design of DWDM networks. For calculation of networks of high complexity a working group is usually created with experts of R&D department of the company. R&D department performs theoretical analysis and numerical simulation of DWDM networks of complex topology, simulation of new components (optical amplifiers, transponders and other devices), simulation and analysis of linear and nonlinear effects using the OptSim software and other tools. 28 Multispan DWDM lines 100G transponders in traditional DWDM line with passive dispersion compensators In existed DWDM lines there are passive dispersion compensators, which were placed at intermediate amplification nodes. The most economical way of the bandwidth Increasing of such a lines is step-by-step substitution of old low speed channels on new higher speed channels. In this case for the long time period it is possible coexistence of channels of different speeds and different modulation formats like 10G NRZ, 40G DPSK, 100G DP-QPSK, 200G DP-16QAM. In these configurations there is a necessary to use periodical passive dispersion compensation. T8 engineers investigated functionality of the 100G transponders in DWDM line with periodical dispersion compensation. The OSNR margin in 1600 km DWDM line is equal to 7.5 db. Coherent DWDM systems of a new generation The use of coherent transponders makes it possible to build DWDM lines without passive dispersion compensators. Mathematical dispersion compensation takes place in the receiver s DSP (digital signal processor). 10 TX 40 TX 100 TX DCU 100 TX 100 TX 100 MUX 100 km N EDFA EDFA DCU DEMUX TX 10 TX 40 TX G transponders TD-10, MS-10FX 40G transponders TS-40E, MS-40E-Q10 Coherent 100G transponders TS-100E, MS-100E-T10 Dispersion compensator MUX 100 km N EDFA EDFA RX 100 DEMUX Coherent 100G transponders TS-100E, MS-100E-T10 RX 100

29 Solutions and Services DWDM Lines With Long Spans Basic configurations The most cost-efficient solutions used erbium doped fiber amplifiers (EDFA). The simultaneous use of a power amplifier and a preamplifier allows transmission of 16 optical channels for a distance up to 155 km and 80 channel for a distance up to 130 km. Simultaneous use of the transmission amplifier and preamplifier allows to organize 16x100 Gbps channels in lines up to 225 km or 80 channels in lines up to 205 km in length. Stock 3 db was taken into account in the middle of the span. Transponders DWDM line up to 155 km Transponders Transponders DWDM line up to 225 km Transponders Raman amplifying Using Raman amplifier units in addition to EDFA transmission and receiving amplifiers allows to organize transmission of 100 Gbit/s channels for a span length up to 260 km in systems with 16 optical channels. Transmit is possible 80x100Gbit/s channels with up to 235 km span. Stock 3 db in the middle of the span. Adding the accompanying Raman pumping allows us to increase these figures, respectively, to 275 km and 250 km. up to 260 km Counter Raman pumping Associated Raman pumping up to 275 km Counter Raman pumping Transponders DWDM line Transponders Transponders DWDM line Transponders 29 ROPA Extra-long sections of DWDM line up to 475 km. The ROPA technology (remote optical pumped amplifier) is used for remote pumping of the erbium doped fiber (EDF). Amplifier is pumped in a separate fiber. In the laboratory of T8 demonstrated a dense wavelength division multiplexing system transmitting 10 x 100 Gbit/s per channel over 500 km without the use of regenerators or erbium doped fiber amplifiers. Transponders 10x100G Transponders 10x100G TX TX Amplifier with remote Pumping (ROPA1) Amplifier with remote Pumping (ROPA2) RX RX TX TX TX TX TX TX TX MUX DCF EDFA1 EDF EDF WDM WDM WDM WDM Span1 Span2 Span3 EDFA2 DEMUX RX RX RX RX RX RX RX TX RX λ 1 λ 2 λ 1 λ 2 λ 3 λ 4 Remote pumping λ 3 λ 4 Counter Raman pumping

30 Solutions and Services Оп Technical Support & Learning We provide full technical support of DWDM and CWDM telecommunication equipment. Services are available 24/7 for all customers with a service contract in place. The scope of technical support depends on a program that was chosen by customer. Response time to customer inquiries starts from 15 min depending on the terms of the contract. We have large equipment replacement fund and are ready to deliver and replace the necessary equipment promptly for our customers at the entire territory of Russia. Customer inquiries are handled using an automated inquiry management system (IMS). Our customers are provided with access to an information portal of the Service Desk. An integral part of training is theoretical preparation Technical support includes the following services 30 Remote fault diagnostics (using phone, , or remote access provided by customer); On-site fault diagnostics; Installation and connection of replacement equipment, recovery of configurations; Preventive upgrade software; Provision of access to an information portal of the Service Desk; Preventive audit of the network; Repair of the failed blocks; Recommendations and guidelines for installation and commissioning of equipment Special attention is paid to practical work with equipment For our customers we organize different trainings. The main purpose of course is expanding theoretic knowledge of DWDM technology, and acquiring practical experience in managing and configuring of real WDM. The considerable part of course s time is dedicated to practical questions of construction and operation of DWDM networks.

31 тическое КТВ Fiber Optic Security System Dunay Distributed Fiber Optic Security System Distributed sensor of vibration and acoustic actions based on the coherent reflectometer for security systems Distributed acoustic sensing (DAS) uses standard singlemode optical fiber (G.652) as highly-effective distributed sensitive element, detecting soil vibrations (acoustic vibrations) at distance of up to dozens of kilometers along the optical cable. Dunay system Hardware detect, localize, classify and alert on activity along the entire length of the cable. It offers cost-effective method of around-the-clock automated environment activity monitoring over long-distance linear objects. «Dunay» system is designed in 3U chassis to be installed in standard 19 telco rack. Chassis has three slots for: receiving/transmitting unit (coherent reflectometer), amplifier module, and industrial computer for data processing and transmission to remote server. «Dunay» system can operate independently or may be integrated to any exiting security system. Open API allows developers connect Dunay system to all modern security applications using Ethernet channels. The system operation is based on coherent reflectometry principle. Optical impulses are sending to the fiber periodically, part of the light is backscattered by fiber irregularities. Fiber microdeformations caused by vibroacoustic impact change the parameters of the scattered (reflected) signal. The changes in the backscattered signal interference pattern analyzing to identify the spot and nature of the impact on fiber. One of the main Dunay applications is the development of early detection systems for critical infrastructure. Since an acoustic sensor allows detecting signals from sources located at dozens or even hundreds of meters from a source, a system operator gets an alarm signal before a trespassing. One standard optical block of the system monitors a zone of up to 40 km, or up to 75 km with remote signal pumping (ROPA). Dunay detects: various events throughout a zone with an accuracy of 10 meters: approach to a guarded zone, movement along the border, or trespassing the monitored zone border. Detection accuracy increases greatly if several monitoring zones are arranged. If a person or car approaches, or if works are in progress near a protected object, the Dunay system is transmitting an alarm event to the operator s computer indicating the source location. The system permits to detect any kind of activity that is causing water or soil vibrations. When installing the system with a client, T8 specialists set Operator window with maps and a list of events at the turn. the system individually by taking into consideration the particular features of every facility. Areas of application of the system: Pipelines monitoring and diagnostics: Routine works monitoring. Protected zone monitoring. Perimeter guarding. Transportation infrastructure objects monitoring: Rail tracks. Flight strips. Bridges, tunnels, highways. Communication lines guarding. 31 OPTICAL FIBER

32 T8 Company 44-1, Krasnobogatyrskaya street, Moscow, , Russia Tel.: +7 (499) , +7 (495) Fax: +7 (495) J, Magnitogorskaya street, St. Petersburg, , Russia Tel.: +7 (812) Tel.: +7 (812) The information in this document is provided for general acquaintance with the company T8, manufactured equipment and new developments. The information provided may be predictive and may differ from actual results. The published information is not a public offer and an offer to conclude deals. T8 reserves the right to change this information at any time without prior notice. Is a registered trademark of Ltd. T8. All rights reserved.