Network expansion. Economic approach to distribution of synchronisation references to network elements. Introduction

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2 Network expansion Economic approach to distribution of synchronisation references to network elements. Introduction The explosion in demand for telecommunications services has resulted in the implementation of complex networks.these often contain a large number of network elements, all of which must be synchronised to ensure that the quality of service meets the international standards and the demands of network users. Very often, extra output capacity is required at the network nodes to synchronise all its elements and it is thus necessary to implement expansion equipment. To meet this requirement, Oscilloquartz has introduced two synchronisation distribution units (SDU), models OSA 5533C and OSA 5530B SDU.

3 Economic approach OSA 5533C SDU The Synchronisation Distribution Unit OSA 5533C SDU provides up to 48 outputs from one or two inputs. It is ideally suited to stand-alone clock distribution requirements in SDH or SONET nodes where a stable reference is available.the unit provides an economic approach to distribution of synchronisation references to network elements, such as switches, cross-connects and multiplexers. The OSA 5533C SDU can also extend the output capacity of Oscilloquartz synchronisation systems such as OSA 5548B SASE or OSA 5542B CTO. The equipment is available with single or dual inputs at 2.048MHz, optionally Mbit/s, 1.544Mbit/s, 1, 1.544, 5 or 10 MHz. Should the selected input fail, the unit automatically switches to the secondary synchronisation input. A highly functional Holdover Unit (HOU) ensures that the OSA 5533C SDU continues to deliver output references even when all inputs are lost. The Holdover Unit contains an oven controlled crystal oscillator whose stability is typically better than 5 x /day, which exceeds the requirements of ITU-T G.812 Type III SSU. The HOU also ensures that input switchover is hitless and maintains output phase changes to within the limits specified in G.812, Paragraph 11.1 (25ns for 0.001<T<0.003s). The OSA 5533C provides up to 48 synchronisation outputs that are referenced to the selected input or the Holdover Unit. Output protection is available for up to 32 of the outputs. A 64 output version is also available using 1.0/2.3 connectors. Re-timing is also available for up to 24 channels. The equipment communicates with a local terminal or a PC loaded with the Oscilloquartz local management software for alarm reporting and control. Remote management by SyncView, Oscilloquartz's professional Network Management System, will be available as a future upgrade option. Summary of Features Single or dual inputs 16, 32 or 48 outputs SSM on Mbit/s inputs and outputs Wide choice of output interfaces Holdover typically < 5 x /day, exceeds ITU-T G.812 Type III SSU Noise generation to ITU-T G.812 Type I SSU (with ideal reference) Re-timing of up to 24 channels SyncView network management Totally maintenance-free

4 Extended capacity OSA 5530B SDU The Synchronisation Distribution Unit OSA 5530B SDU is designed primarily to extend the output capacity of our synchronisation systems such as OSA 6500B PRC, OSA 5548B SASE or OSA 5542B CTO. It can also be used in stand-alone applications where a stable reference is available.the unit provides distribution of synchronisation references to network elements, e.g. switches, cross-connects and multiplexers. The OSA 5530B SDU's protected front-end accepts two external synchronisation reference inputs at MHz and provides up to protected or unprotected synchronisation outputs, which are referenced to the selected synchronisation input. Should the selected input fail, the unit will automatically switch to the secondary synchronisation input. Output phase coherence after changeover operations is maintained well below 1/8UI (61ns), typically 5ns.This is important for SDH/SONET networks that are more sensitive to phase variations. Switchover is normally made automatically. Manual switching is done via RS232. The OSA 5530B also includes redundant output ports to drive further SDUs. The equipment communicates with a local terminal or a Personal Computer (PC) for alarm reporting and equipment control. When used in conjunction with an OSA 5548B, the unit can be managed by the SyncView synchronisation network management system for alarm reporting and control functions. Summary of Features Two inputs Up to protected or unprotected outputs Wide choice of output interfaces Modular approach ETSI or 19" rack mount versions SyncView network management Totally maintenance-free

5 Two choices Specification OSA 5533C OSA 5530B No. of inputs 1 or 2 2 Type of inputs 2.048MHz or 2.048Mbit/s 1.544, 5 and 10MHz also available 2.048MHz Switchover Automatic Automatic Phase after input changeover 25ns for 0.001<T<0.003s <61ns, typically 5ns Number of outputs Up to 48 (or 64 with 1.0/2.3 connectors) Up to 96 Type of outputs 2.048MHz, 2.048Mbit/s, 1.544Mbit/s, 64kbit/s CC, 1.544, 5 or 10MHz 2.048MHz, 2.048Mbit/s, 1.544Mbit/s, 64kbit/s CC, 1.544, 5 or 10MHz Output card protection 32 outputs can be protected 96 outputs can be protected Holdover capability Exceeds ITU-T G.812 Type III SSU No Re-timing function Local alarms display Relay contacts Local RS232 port SyncView management Please refer to factory for availability Via OSA 5548B SSM support When used with OSA 5548B SASE or OSA 6500B PRC ETSI subrack 6U: 266 x 535 x 265 mm 9U: 399 x 535 x 265 mm 19" subrack Please refer to factory for availability 6U: 266 x 483 x 265 mm Table illustrating some of the main differences between the two models.

6 Common features Well-proven design The OSA 5533C and OSA 5530B SDUs use the well proven modular approach from Oscilloquartz and are totally maintenance-free. Partially equipped configurations are also available with upgrade capability to the full configuration.all plug-in cards can be replaced in a hot condition. Output Flexibility Various output interface modules are available each with 16 outputs.interface types include Mbit/s, MHz,1.544 Mbit/s,64 kbit/s CC,1,5,10 MHz and many more. The units offer a highly versatile choice of output connectors that can be configured in groups of four at the factory or in the field. The choice of connectors includes D type for 100,120 or 133 Ohm ports and BNC,1.6/5.6,1.0/2.3 or type 43 for 75 Ohm ports. Several hundreds of outputs can be achieved by adding more OSA 5530B expansion subracks. Alarms and Monitoring Both models include a Monitoring and Alarms Controller (MAC2) card.the card concentrates all shelf alarms,provides visual indicators,relay contacts for in-station monitoring and a local RS232 port.it also features Urgent and Non- Urgent indications as well as a Receiving Attention function to acknowledge active alarms and an audible alarm.with OSA's easy-touse local management software,the user can configure the system,receive spontaneous events and view the alarm list. Output Interface 1 Input 1 Input Interface 1 Holdover Unit Output Interface Splitter Input 2 Input Interface 2 By-pass Switch Output Interface 3 Power Supply 1 Power Supply 2 Output Interface 4 Management Module (MAC2-R or RMU) Schematic of OSA 5533C illustrating functional blocks To Local or Remote Management System

7 Upgrade options Choice of Subracks The 5530B subrack is available in ETSI or 19" rack mount formats.the 5533C is housed in an ETSI,6U high subrack.both models are equipped with redundant power supply modules.these can be DC,AC or a combination of the two. As with all our solutions,the units have been certified to European EMC and Safety standards and thus carry the CE mark. Upgrade Options In accordance with the company's policy with regard to continuous improvement of its solutions,oscilloquartz plans to introduce new features for both models to provide added functionality. Upgrades will include: Re-timing Unit (RTU) to re-time up to eight Mbit/s channels Remote Management Unit to enable management by SyncView,Oscilloquartz s professional Network Management System Please contact factory for release dates of these and other upgrade options. We have a very detailed Product Booklet for both the 5533C & 5530B. Call your local representative to obtain your free copy MHz Input MHz Input 2 Phase Stepper Switch Channel 1 Phase Stepper Switch Channel 2 Passive Combiner Splitters OIU 1 OIU 2 OIU 11 OIU 12 Outputs to SDU 16 Protected Sync Outputs 16 Protected Sync Outputs Monitoring & Alarms Controller Alarm & Control Power 1 Power Supply Unit 1 Power Feed to Units SSM Interface Unit 1 SSM 1 SSM In 1 SSM Out 1 Power 2 Power Supply Unit 2 SSM Interface Unit 1 SSM 1 SSM In 2 SSM Out 2 Schematic of OSA 5530B illustrating functional blocks

8 Oscilloquartz SA CH-2002 Neuchâtel 2 Switzerland Telephone: Facsimile: osa@oscilloquartz.com Ed 02/15/9/99 FECH