COMMUNICATION & NETWORK DESIGN STANDARD CABLING STANDARDS. Version AUTHOR: Gary Hill, Anatoli Bogajewski

Transcription

1 COMMUNICATION & NETWORK DESIGN STANDARD CABLING STANDARDS Version 1.26 AUTHOR: Gary Hill, Anatoli Bogajewski

2 DOCUMENT CONTROL Version Changed By Description Date 1.0 Gary Hill Document created / Draft Gary Hill Updating document Gary Hill Minor amendments and added Annex A 1.1 Gary Hill Updating UTPcable standard to Cat6a x Anatoli Bogajewski Document review, New doc template New content 1.24 Ruth Rodríguez Review Anatoli Bogajewski Reworked fibre optics chapter and specified the use-cases for SMF and MMF Added chapter 5.1. Network connectivity in factories, including Ring and Star topology templates for internal discussion 1.26 Anatoli Bogajewski Few minor adjustment after internal review 1.27 Anatoli Bogajewski Added approvers PEER REVIEW Version Reviewed By Date 1.27 Tim Davies Ruth Rodriguez Quesada

3 CONTENT DOCUMENT CONTROL... 2 PEER REVIEW... 2 CONTENT... 3 ABOUT THIS DOCUMENT Regulations and standards Execution regulations and standards Planning requirements Fasteners and anchoring devices Cable channels Cable installation Minimum separation Copper Cabling and Connection Standards Approved copper cabling type Symmetrical data cabling in the horizontal area Maximum copper cable lengths Symmetrical copper cabling in the building backbone Connection components Copper cabling connection types Standard connection technology (e.g. panels, outlets) RJ45 patch leads Copper GBIC / SFP Modules Fibre Optics Standards Fibre cables Fibre Optic connectors Optical fibre hardware Requirements for the installation of optical fibre Vendor selection policy for fibre optics products Fibre optic GBIC / Cisco SFPs Measurement standards Measurement requirements for copper systems Measurement requirements for symmetrical data cable Measurement requirements for optical fibre cable Installation drawings... 17

4 5 Templates and examples for cabling installations Network connectivity in factories SMF ring cabling template MMF redundant star cabling template Offices Example 1 - New office building is over multiple floors New office building is over multiple floors and longer than 100m New ASRS to be added to existing factory environment Approved product examples... 24

5 ABOUT THIS DOCUMENT Introduction In 2018 there is a mixture of copper, fibre, connection types and technologies existing within CCEP. The aim of CCEP is to harmonize the situation and ensure a consistent installation of fibre / copper cabling as well as any of the communication equipment. This document is aimed as a guide to provide sufficient information, knowledge and standards to ensure consistency of cabling installation throughout the CCEP. This document is a guide for employees as well as for external partners of CCEP: Scope The following standard applies to cabling for all of CCEP sites. It applies to cabling of all kinds on-site (backbone, vertical and if-applicable horizontal) The standard does not apply to data centre sites. Acronyms Acronym AWG GBIC MMF SFP SMF UTP SFTP WLC SFP LAN RJ MHz ISO IEC EN Cat CAD PoE Meaning American wire gauge Gigabit Interface Card Multimode Fibre Small Form-Factor Pluggable Single Mode Fibre Unshielded Twisted Pair Screened Foiled Twisted Pair Wireless LAN Controller Small Form-Factor Pluggable Local Area Network Registered Jack Megahertz International Organization for Standardization International Electrotechnical Commission European Standard Category Computer-aided design Power over Ethernet

6 1 Regulations and standards 1.1 Execution regulations and standards The vendor must adhere to the latest international regulations and standards, e.g. ISO/ IEC and EN. ISO / IEC 11801, Generic Cabling Standard for Customers Premises EN Part 1-5, Performance Requirements for Structured Cabling The manufacturer s installation instructions and data sheets The data network is to be implemented as an application-neutral Local Area Network (LAN) as per EN Cabling is to be installed throughout the buildings. Particular attention must be paid to sufficient reservation of capacity in transmission speed and electromagnetic compatibility (EMC) according to EN 55022, EN and EN Furthermore, country-specific regulations and standards, e.g. DKE (the German electro technical standards body) and VdS Schadenverhütung (The Authority for Safety and Security) must be applied correspondingly. Existing older networks cannot generally be integrated into the LAN and if necessary must operate separately or preferably be removed, in order to reduce fire load and save space in cable channels. 1.2 Planning requirements The cabling system is to be designed according to the Standards ISO/IEC 11801, EN and EN50174 Series. According to these Standards, the network consists of three areas: Primary area: the connection between various buildings. Secondary area: the connection between the building main distributor and the storey distributor (riser cabling). Tertiary area: the connection between the storey distributors and the outlet at the individual workstation. Figure 1: Cabling structure

7 1.3 Fasteners and anchoring devices Conspicuous fasteners and anchoring devices required onsite for considerable lengths of time must be approved by the CCEP. All equipment fixtures must be removable. Approved plugs are to be used only and certificates of approval must be produced before installation. Plugs must be selected and installed with consideration for their bearing load. The use of plugs in ceilings, floors and other areas is to be agreed in consultation with the structural designer. All drilling work in visible areas is to be carried out with due care and without damage to insulation or cladding. 1.4 Cable channels Before re-use of existing cable channels it should be ensured upfront that cable trays and channels meet their needs. New cable channels needs to be installed correspondingly. 1.5 Cable installation The cables are to be laid in cable trays and channels, unless otherwise requested. Cable routes are to be documented on building plans, preferably in CAD format, and provided alongside the requested documentation on a memory stick or CD. The cable routing must satisfy the requirements of the site engineer and project team. Vertical routes will require the necessary strain relief. Cables are to be laid untwisted in channels and trays. The existing cable channels onsite will provide the basic outline for the cable routing. The cable laying must be agreed with CCEP architects team, or with someone appointed by the team, so that, all things considered, the routes chosen are those most sensible for the company. In principle, the cables are to be laid without any additional connectivity (closures etc.). Exceptions must be agreed with the architects, or with someone appointed by the designer. Any materials needed to lay the cables (cable ties, screws, plugs etc.), cable cutting and any possible copper adders must be calculated in the unit price and will not be paid for separately. The installation instructions of both the cable manufacturer (concerning tensile strength, bend radii etc.) and the component manufacturer must be adhered to. 1.6 Minimum separation The minimum separation requirement between IT cabling and power cables must be observed according to EN , VDE 0100 and other standards.

8 2 Copper Cabling and Connection Standards 2.1 Approved copper cabling type Approved copper cabling type within CCEP Name Specification Cable type Cat 7 A S/FTP Max distance 100m, see 0 Max. transmission speed 10 Gbit/s up to max distance of 100m 2.2 Symmetrical data cabling in the horizontal area Channel Class EA symmetrical data cabling with a full braid shield is to be used for the horizontal area, according to ISO/IEC and EN The data cable must have 8 solid AWG-22 copper wires in twisted pairs, with foil shielding for each pair as well as a full braid shield. The cable must comply with the following conditions: Halogen-free (LSZH) CPR class Dca Flame retardant according to IEC and EN Non-corrosive according to IEC und EN Low smoke according to IEC and EN Fulfils the requirements of the standards EN , IEC up to 1000 MHz and IEC up to 1200 MHz Figure 2: S/FTP cable structure

9 FutureCom 10 TEN Maximum copper cable lengths According to ISO/IEC and EN50173 Series, copper cable may only be laid up to a maximum length of 90m + 2 x 5m between the cross connect and the outlet. The attenuation of the entire transmission length, including patch panels and patch cords, must remain within the acceptable value range as prescribed by the Standards ISO/IEC and EN Symmetrical copper cabling in the building backbone Generally, there is no copper cabling intended for the riser area. This will only be permitted on an exceptional basis and for small CCEP sites only. 2.5 Connection components Connection components refer to both the patch panels and the outlets. Together with the cables, they form a link which defines the transmission properties of the tertiary area. Certain marginal conditions have to be fulfilled in order to achieve a good signal interference ratio combined with adequately high interference resistance: Patch panel CORNING Horizontal cabling Outlet CORNING FutureWAY Permanent Link Patchcords Figure 3: Diagram of a permanent link The connection components must be suitable for a link fulfilling network application class EA. This applies to both the permanent link and to the channel. In order to achieve high reflection attenuation, the impedance of the connection components must be 100 Ohm and must be coordinated with the data cable across the relevant frequency range. The connection technology used in the connection components must allow the pair shielding to be removed up to a maximum length of 10 mm. Compliance with these values under site conditions is to be verified by experience onsite. The connection components must be capable of accommodating the complete screening of the data cable all round (360 ). This is the only way to guarantee that high frequency interference (e.g. mobile networks or radar systems) can be quickly dissipated.

10 2.6 Copper cabling connection types Approved connector type within CCEP Name Connector type Specification RJ45 Figure 4: RJ45 Jacks i The RJ45 jacks are certified for Cat 6a only. While using with the Cat7/a cabling RJ45 connector will limit and reduce the overall standard of the connection. Only systems with a high degree of system reserves should be used for installations. Required characteristics of RJ45 connectors 3-Connector Permanent Link / Channel, confirmed neutral and independent Fulfils all requirements in 2 and 4 connector model according to class EA Suitable for applications of class EA according to ISO/IEC Ed.2.2 and EN Series Industry standard Keystone dimensions Supports Power over Ethernet (PoE / PoE+) IDC contacts: Suitable for AWG solid wires, Reproducibility: Several times reusable Cable entry: 0 with 360 shield contact and strain relief 2.7 Standard connection technology (e.g. panels, outlets) The connection technology must fulfill the following general conditions: Outlets The outlets must be suitable for accommodating two highly screened data cables. The structure of the outlets must allow for the data cables to be connected in the outlet without undercutting the tolerable bending radius. This also applies if several outlets are connected in a device cup/ cable channel. The jacks must be positioned to allow for patching with straight plugs, without compromising the tolerable bending radius of the patch cables. The outlets must be screened. A covered label panel must be available to label the outlet. This allows for indelible, neat labeling, and also for rapid corrections of any mistakes. The labeling must be coordinated with the client before installation.

11 Panels Applicable for all 19" racks Keystone footprint Port labeling 2.8 RJ45 patch leads Patch leads are used to connect the end device and within comms cabinet for connection. Patch leads should not exceed 3 metres in length. 5 metres is maximum. Patch lead colour scheme # Patch lead colour Purpose a. White Backbone cabling b. Yellow Servers c. Red Active Network Devices d. Orange Wireless APs e. Grey / White / Purple / Blue f. Green Analog Phones End point devices, e.g. Users (laptops, desktops ) and Video Equipment (TPs...) 2.9 Copper GBIC / SFP Modules The industry-standard Cisco Small Form-Factor Pluggable (SFP) Gigabit Interface Converter links switches and routers to the network. The hot-swappable input/output device plugs into a Gigabit Ethernet port or slot. Figure 5: Cisco 1000BASE-T Copper SFP Following Cisco SFP modules for copper connectivity is an example and can be used in CCEP. Type GLC-TE= Description 1000BASE-T SFP transceiver module for Category 5 copper wire, RJ-45 connector, Extended Temperature For further details, please refer to CCEP Network Hardware Standard.

12 3 Fibre Optics Standards 3.1 Fibre cables Fibre will be run between floors (vertical) to the mains comms room to provide the backbone of the network. Approved fibre characteristics: Cable type Cable class Colour Core Size Data rate / Max distance Laser-Optimized Multimode OM4 Aqua or Magenta 50/125µm 1 Gbit/s 550m 10 Gbit / s 400m Figure 6: OM4 patch cable The use of single-mode fibres with a classification according to OS1 or OS2 is dependent to the distance. If the overall distance of cable is beyond the above-named specification for multi-mode cables, single mode cables need to be used. Relevant hereby is the overall distance possibly as a sum of all part sections between two transceivers. In this case the cable class depends on the distance as well on the primary use indoor or outdoor. Primarily and unless it is obligatory required, OS1 cables should be used. Name OS1 OS2 Standards ITU-T G.652 A/B/C/D ITU-T G.652 C/D Cable construction Tight-buffered Loose tube Maximum attenuation 1 db/km 0.4 db/km Max 2 km 10 km Application indoor outdoor i For further information and examples for the proper selection of specific fiber-optic cables in face of specific use-cases please see Chapter 5 Templates and examples for cabling installations

13 3.2 Fibre Optic connectors The standard connector type to be used within CCEP on all cable ends is LC. Only LC connectors that conform to TAI/EIA A and IEC are permitted for use in new installations. It must be possible to use the selected type equally for multimode fibres and single-mode fibres. Required characteristics The insertion attenuation for single-mode fibres is to be typically < 0.1 db / max. < 0.4 db and the return loss min. 50 db. The insertion attenuation for multimode fibres is to be max. < 0.5 db and the return loss min. 20 db. When using single-mode fibres with angled physical contact (APC) end face instead of lentoid coupling, the return loss is increased to min. -60 db. The duplex version, the LC duplex connector, is prescribed for connection into the telecommunications outlet. Figure 7: LC connector with OM4 cables Only connectors with high quality pre-polished fiber stubs that can be spliced inside the connector are permitted. The installation method for direct termination of the fiber connectors within the cabling system must offer a visual means of testing and a guaranteed testing method while the system is in operation. Appropriate labeling is to guarantee the clear designation of installed fibers. 3.3 Optical fibre hardware The splice panels must be modular and multifunctional for various applications in 19-in racks and main distribution frames. The sliding and tilting housings can be equipped with industry common adapter types in different fibre categories and are suitable for direct field termination, fusion splicing with pigtails as well as pre-terminated solutions.

14 3.4 Requirements for the installation of optical fibre When routing and installing optical fibre lines, care must be taken to ensure that the attenuation of a complete optical fibre line does not exceed the limit values of standard ISO/IEC The optical fibre cables must be routed correctly in channel and tray systems. The cables must only be installed within the tolerable temperature range. The limits for the tolerable minimum bending radius and the tolerable maximum tension and lateral pressure forces must not be exceeded under any circumstances. 3.5 Vendor selection policy for fibre optics products Only fibres from one manufacturer (e.g. only from Corning) are to be used within one project and within one fibre type (e.g. multimode or single-mode). All routed optical fiber cables must be clearly recognizable as optical fiber cables at all visible and accessible points. The selection of different optical fiber products from different manufacturers (e.g. of pigtails, patch cords, optical fiber cable, adapters) is not permitted. 3.6 Fibre optic GBIC / Cisco SFPs The industry-standard Cisco Small Form-Factor Pluggable (SFP) Gigabit Interface Converter links switches and routers to the network. The hot-swappable input/output device plugs into a Gigabit Ethernet port or slot. Figure 8: Cisco Optical Gigabit Ethernet SFP Following Cisco SFP modules for fiber optics connectivity are examples and can be used in CCEP. Type GLC-SX-MMD= GLC-LH-SMD= SFP-10G-SR-S= Description 1000BASE-SX short wavelength (850nm); with DOM For use with MMF cables Clip is Brown in colour. 1000BASE-LX/LH long-wavelength (1310nm); with DOM For use with MMF (up to 550m) or SMF(up to 10000m) cables Long Haul clip is blue in colour 10GBASE-SR SFP Module, EnterpriseClass For further details, please refer to CCEP Network Hardware Standard.

15 4 Measurement standards For each cable installation and prior to taking a new connection into service a full measurement needs to be conducted. The vendor is obliged to duly meet the performance requirements. Measurements of all links must be provided as evidence of this. The vendor is to supply all necessary test equipment, including test adapters, and is to provide a digital copy of test certificates to a member of personnel named by the customer. 4.1 Measurement requirements for copper systems Specification of a class E or EA channel The word link used in this text refers to the connection between patch cord, patch panel, data cable and outlet. The corresponding standards also refer to this link as a channel". Channel (100m max.) 5m Permanent Link (90m max) CP Link (Optional) 5m EQP C C C C C TE Patch Cord / Jumper Installed Link CP TO Patch Cord / Jumper Figure 9:Channel The acceptance inspection will not provide the data for each individual component but only those of the link. Corresponding manufacturer guarantees and reference measurements will be demanded for the component properties outlined in this specification. The guarantee period, in accordance with the system guarantees, must comprise a minimum of 25 years. Standards ISO/IEC , minimum requirements for transmission permanent link or channel class EA. 4.2 Measurement requirements for symmetrical data cable The following measurements are required for a permanent link or channel measurement according to the standard ISO/IEC11801 or EN for the transmission class EA.

16 Test parameters for full duplex transmission: Wiring (Wire Map) Attenuation Near-end crosstalk attenuation (NEXT) Far-end crosstalk attenuation (FEXT) Equal level far-end crosstalk (ELFEXT) Power sum ELFEXT Attenuation to crosstalk ratio (ACR) Power Sum ACR Return loss attenuation Impedence Propagation Delay Skew Delay Return loss attenuation 4.3 Measurement requirements for optical fibre cable Tier 1 testing is the minimum level of testing that is required. This level of testing consists of link attenuation testing, link length, and a polarity check. The fibre optic link attenuation is tested using an optical loss test set (OLTS) or a light source and power meter (LSPM). This type of testing is the most accurate testing available and is the most accurate characterisation of the fibre optic system s capability. Testing with an OLTS/LSPM can be conducted at one or more wavelengths, but at a minimum, it is recommended that testing be performed at the wavelength that the network will operate (for example 850 nm for a laseroptimised fibre network where a VCSEL will be used for data transmission). Unidirectional testing is the minimum level, but the system owner may require that a bidirectional test be performed (testing performed from both directions). The link length can be obtained by recording the sheath distance found on the cable jacket or with the OLTS if it has this capability. Polarity verification is performed by either using a visual fault locator (VFL) or while performing the attenuation testing with the OLTS/LSPM. Tier 2 testing involves the use of an optical time domain reflectometer (OTDR) to provide a trace (visual picture) of the installed fibre optic network. The wavelength(s) used for acquiring the OTDR traces should be the same as the wavelengths used for the Tier 1 testing. Tier 2 testing is listed as optional in TIA-568-C.0, but this does not mean it is not important. The OTDR trace can be used for cable acceptance, splice and connector loss, documentation, troubleshooting, fault location, optical return loss, and to measure the length of the system. The OTDR trace can provide a visual picture of the fibre link that the OLTS/LSPM cannot. Even though the OTDR is a powerful tool, it does not replace the need for Tier 1 testing, because OTDR testing results can vary as a result of user setup. To get a true measurement of an event with an OTDR, a trace needs to be shot from both directions and the average of the losses needs to be calculated. The following measurements are required as per ISO/IEC11801 or TIA/EIA 568 C.0.

17 The maximum fibre loss value according to ISO/IEC11801 standard: OM3/ OM4 at 850nm max. 3.5 db/km OM3/ OM4 at 1300nm max. 1.5 db/km OS1 at 1310nm and 1550nm max. 1.0 db/km OS2 at 1310nm and 1550nm max. 0.4 db/km The maximum loss value according to TIA standards is 0.75 db per connector pair. 4.4 Installation drawings The vendor is to supplement the documentation provided to CCEP with any drawings required for the installation. The documentation is to include all details necessary for the customer (or someone nominated by the customer) to have a clear understanding of the installation. Final installation drawings are to be drawn up detailing any modifications that take place in the course of the installation. This includes the following: Layout drawings with numbered patch panels, cable channel routing and outlets Diagrams Patching diagrams with port and cable numbers Cable listings with the following information: Cable number Cable designation Link length Cable route (from/ to) Coordinates of patching location (port numbers) Building Floor Room Test certificates with measurement method and measurement values, on a CD or memory stick CAD/ELCAD drawings (using the latest version), if agreed using The above documentation is to be provided in the following form after the installation: 1x documentation in digital format. 1x printed copies left in racks 1 copy of each of the following is to be provided together with an index page. Operating instructions for the installed system A list of components and quantities A description of equipment and its function Detailed maintenance instructions Copies of all inspection documents All additional documentation is to be provided in a digital format.

18 5 Templates and examples for cabling installations This chapter consists of typical layer 2/3 network implementation scenarios for specific usecases found at new and existing CCEP sites. Each of the templates is a valid approach in specific situations, but the choice of the right alternative needs to be done case-by-case after a thoughtful analysis and concept. The template-specific design cannot be applied without further alignment between business, project and network operation teams. Templates included and content provided here will be extended as we progress with implementations. 5.1 Network connectivity in factories SMF ring cabling template Especially for factories it should be considered to implement a redundant connectivity as a ring of multimode connections between all racks, whereby each rack is connected via exactly one cable to the previous in ring and one cable to next in-ring racks. The cabling of a factory building might look n a result as shown within Figure 10 Cable runs arranged as a ring Figure 10 Cable runs arranged as a ring In these drawing cabinets 1 and 3 (red) represents core switch locations. The connectivity to each rack is given by the redundant ring connection (purple) across the factory. Only one cable is used to connect each rack in the ring to the next/previous one. Each cabinet is connected to each cable in the ways shown in Figure 11: SMF ring rack cabling principle.

19 Figure 11: SMF ring rack cabling principle This approach has potentially the following advantages: - A significant reduced number of cables, panels, connectors (dependently on the physical situation and conditions). Smaller racks - Unified implementation scheme: Each rack has the same identical standardised layout in each factory. Therefor a consistent technical implementation and operation procedures applies to each site. - Redundancy: each cabinet is connected always via two redundant ways. However, following arguments needs to be considered: - The use of single-mode fibre is presumably required because the length of the connections. - While the type of cabling will be not the major distinguishing criteria, the costs of the overall systems will be increased due the fact that SMF transceivers have significantly higher costs than those for MMF (factor x2) - Multiple rings might be required to connect all cabinets in a redundant way and the advantages of a simple cabling scheme might be negated in particular situations. - The redundant connectivity to each of the cabinets might not be required. Providing redundant connectivity to each cabinet might be a complicated and an extensive effort. Therefore only cabinet s business-critical cabinets must be connected in a fully redundant way. - In this daisy chain-like implementation a failure or a problem of one of the two cable or operation failure for one of the connector elements (e.g. Fibre optics panels) affects elements behind that point of failure. Due the existing redundancy this failure will have no effect as long as the other connection remains intact, but operational risks affects still the whole ring, e.g. if the connectivity failure and the reduction of redundancy level remains firstly undiscovered.

20 5.1.2 MMF redundant star cabling template As an alternative to the above described ring template a star topology can be implemented. For the same scenario as above the implementation of cabling run can be done using the full redundant cable connectivity as shown in Figure 12: Redundant star cabling topology Figure 12: Redundant star cabling topology In these drawing cabinets 1 and 3 (red) represents core switch locations. The connectivity to each rack is given by dedicated direct redundant connection from/to each of the core locations (blue and purple). Additionally, both cores are connected via direct dedicated connection (green). Any of the cables might run possibly in the same tray. Each of the cables connecting any of the access cabinets terminates in both of the core racks, as shown in the Figure 13: Core rack. Figure 13: Core rack

21 This approach has following characteristics: - (Nearby) Full redundancy between each of the cabinets without direct dependency on other connections. No daisy chain. - But possibly increased number of cable runs, more cabling, more panels, more terminations, more used rack space, - Because any of the cable might also run in the same tray (But not have to) the level of physical redundancy can still be lower than a full double-star topology is meant to. - Cables with fewer fibres can be used. - Presumably one cabling standard for all links can be applied (OM4 MMF). - Cheaper transceivers if MMF cables are used. - Redundancy level for particular cabinets can be reduced if needed without changing the overall principle. 5.2 Offices Example 1 - New office building is over multiple floors End to end distance of office environment is 90 metres. Single comms room / comms cabinet per floor is sufficient. Floor outlets are run back to respective comms room. Between each floor to comms room fibre cabling is run using SMF fibre according to the above made specifictaions. For a full redundant implementation each floor cabinet have to be connected in a double-star topology to each of the two core racks in comms room. Distance 90 metres end to end Floor 3 Floor 2 Floor 1 Ground Floor Comms Room Figure 14:Office cabling example 1

22 5.2.2 New office building is over multiple floors and longer than 100m End to end distance in office environment is 120 metres. We know max distance for Cat 7a is 100 m. Easiest option here is to place the comms cabinet / comms room in the middle of the office this ensures that only one cab is required and all floor outlets are within the 100m rule. Backbone would be fibre to the ground floor comms room. Option B lot more expensive would be to place comms room at each end of the office. So in this scenario one comms room would be ideal. Distance 120 metres end to end Floor 3 60m to comms room 60m to comms room Floor 2 60m to comms room 60m to comms room Floor 1 60m to comms room 60m to comms room Ground Floor Comms Room Figure 15: Office cabling example New ASRS to be added to existing factory environment Cab A = Main Comms Room Cab B = ASRS Cab 1 Cab C = ASRS Cab 2 Cab D = Gatehouse Things to look out for? - Distance between cabs add up the distances. - Check against fibre distances table. - ASRS has 2 cabs why? - Physical distance and remember Cat 7A has max distance of 100m (@10Gbit/s) - That s why 2 cabs are here to ensure coverage is maintained. - Redundancy

23 Solution here would be: Cab D Cab A = Approx 450m = OM4 MMF. Cab C Cab A = Approx 300m = OM4 MMF. Cab B Cab A = Approx 200m = OM4 MMF. By having 2 comms cabs in ASRS we have also covered the 100m rule for Cat 7 A (copper cabling). Fibre Fibre Fibre 100m 200m A Comms Room B 100m C ASRS 150m Gatehouse NOT TO SCALE Illustration only D 100m Figure 16: Cabling example ASRS

24 6 Approved product examples BoM examples will be included here for the following components as we continue with the implementations. - Cables - Connectors - Panels - Modules - Outlets