Example Transport Engineering Guide (TEG): DSX-3 Rear Cross Connect

Transcription

1 Example Transport Engineering Guide (TEG): DSX-3 Rear Cross Connect BOTC-TEG-2300 Section Table of Contents Page DS Data Sheet (weight, footprint, power, heat, timing, alarms/rm, DF blocks, CLEI) 2 1 Overview 3 2 Network Element IN/OUT connections 3 3 Front side patching jacks (440 versus 358) 3 4 Equipment requirements 4 5 Relay rack and lineup layouts 5 6 DS3 and STS-1 terminations V condition 6 8 Open space between racks 7 9 Relay rack fuse panel input power feeder source 7 10 DSX-3 panel label requirements 7 11 Cross Aisle Bridges Application guide for extended cross connect segments System connection details Issue Revisions Date 1 Original release of Bill Oakes Engineering Guideline for DSX-3. October 9, Revise into Word format. July 29, 2007 Acronyms: American Wire Gauge (AWG), Battery Distribution Fuse Board (BDFB), Central Office (CO), Digital Cross connect System-electronic (DCS), Digital System Cross connect-manual (DSX), Distributing Frame (DF), Enclosed Network Extension-RT/CEV/Hut/Prem (ENE), IntraOffice Repeater (IOR), Network Element (NE), Receive (RX), Support Engineering Guide (SEG), Transmit (TX). Bill Oakes Telecom Consultants (BOTC) bill.oakes@att.net, Copyright All rights reserved. 1

2 Data Sheet: The preface section of all BOTC-TEGs is a data sheet that provides quick view information for weight, relay rack footprint, peak (LIST 2)/nominal (LIST 1) power amperage, heat dissipation wattage, timing, alarms/remote management, DF block and CLEI code requirements. The data shown is an ultimate condition (relay rack fully loaded with equipment as designed in associated BOTC-TEG). Even though many relay rack deployments are partially equipped, BOTC recommends basing initial space/engineering planning on ultimate data since existing rack layouts typically grow to conclusion without follow-up involvement by planning personnel. Category Weight Footprint Peak/LIST 2 amperage at 42.6V Nominal/LIST 1 amperage at 52V Heat dissipation Timing (BITS) Alarms Remote management DF blocks CLEI codes (see BOTC-SEG-0600 section 4) Data sheet for DSX-3 rear cross connect relay rack Requirement Remarks One relay rack: 120 pounds. One fuse panel: 10 pounds. Two troughs: pounds pounds. Ten ring kits: 40 pounds. Worst case mix of equipment shelves/panels/units (15 DSX4R panels at 40 pounds each): 600 pounds. 33.5" wide x 15" 26" wide rack. 7.5" wide spacer between adjacent racks. 5" wide spacer at deep ultimate end of lineup. 2" deep front guard box. 8" deep rear guard box. See remarks N/A N/A N/A 1 discrete N/A See remarks PWFYAL3CAA T3MYAGCAAA T3MYAFKAAA T3MYAJBAAA None TECYAH7HAA Per section 9, only middle rack (M) of every 5 has single load BDFB feed. M rack LIST 2 depends on planned quantity and type of panels in M rack and 4 associated C racks. System Connection Details section has LIST 2 for each panel type. For example, full C rack of 15 DSX4R panels would be 4.8 amp (.32 per panel). LIST 1 does not apply since power requirement is for occasional use of panel tracer lamps only. LIST 2 must account for the rare case of full activation (all lamps at all panels). Does not apply since heat is a function of LIST 1. See BOTC-SEG-0600 section 8. No timing requirement for DSX-3 racks. 1 status point required on CO alarm system for DSX-3 rack fuse panel alarm No Ethernet or RS232 TL1 remote management requirements for DSX-3 racks. Normally no DF connection for DSX-3 racks. Possible connection for optional Comm panel telephone lines per section 13F. Telect 0HPGMT08R fuse panel. ADC DSX4R-D32 DSX-3 cross connect panel. ADC DSX4H-W0C DSX-3 cross connect panel. ADC DSX-XA-BB-24R DSX-3 cross aisle panel. ADC DSX-IB-MB-24L DSX-3 interbay patch panel. ADC COMP-21 comm panel. 2

3 1. Overview: DSX-3 panels are used to terminate DS3 (traditional Mb/s) and STS-1 (Sonet Mb/s) signals that require a manual cross connect. Each panel has up to 24 (ADC DSX4H series) or 32 (ADC DSX4R series) module positions. The modules have two sets of rear BNC connectors (for NE coax and permanent cross connects) and front side jacks (for temporary In Service/Out of Service patching routines and various testing functions). This type of DSX-3 module design is called Rear Cross Connect (RX). DSX-3 modules that terminate NE coax are referred to in this TEG as active jacks. Double ended duplex (two coax and one tracer lamp lead) cords are used to complete the permanent cross connect between modules. These cords are supported by rear side vertical rings and horizontal troughs within a given DSX-3 lineup. When 7 DSX-3 lineups are contiguous, low cable racks (called Bridges in section 11) can be used to support the cords that run between lineups (one cord from active jack in one lineup to active jack in other lineup). Non-contiguous DSX-3 lineups must use Cross Aisle panels (cord from active jack in each lineup to Cross Aisle panel in same lineup with engineered coax between Cross Aisle panels). The total cross connect length (active jack to active jack including any cross aisle coax) has a footage limit that is related to NE coax length limits (see BOTC- SEG-0200 section 3 and 4). When the cross connect limit is exceeded, ADC DS3/STS-1 IntraOffice Repeaters (IOR) may be required. Section 12 provides an Application Guide for DSX-3 cross connect segments. Double ended single (one coax and one tracer lamp lead) cords are used for temporary front side patching routines. If the routine is In Service, a portable Bridging Office Repeater (BOR) unit is required (boosts active jack front side MON port from monitor level to full strength so patching can be done without disrupting NE service). Interbay Patch (also known as Beltline) panels are used so local CO personnel can patch/restore these circuits without using excessively long cords (short cords run to the panel on either end with engineered coax between panels). 2. NE IN/OUT connections: To provide a uniform method of connecting different types of NEs, a basic set of guidelines was developed by the Bell System. Engineering/installation documents (BOTC-TEGs for example) must always agree with these guidelines so that transmission IN/OUT continuity is maintained between NE, DSX and DCS (Lucent DACS, Tellabs Titan) equipment. If you (NE or DCS) face a DSX, your TX goes to the DSX OUT jack and your RX comes from the DSX IN jack. If you (NE, DSX or DCS) face a DCS, your TX goes to the DCS IN port and your RX comes from the DCS OUT port. The roll of TX and RX between NEs is accomplished by IN to OUT/OUT to IN duplex cross connect cords (if DSX-3) or internal electronic switching (if DCS). TX and RX coax between DSX-3 Cross Aisle panels must also roll since the cross connect cord roll (NE DSX-3 jack to Cross Aisle jack) at both ends will cancel each other out. DSX-3 Interbay Patch panel cabling has this same requirement (roll coax between panels since NE DSX-3 jack to Interbay Patch jack patch cord rolls at both ends will cancel each other out). 3. Front side patching jacks (440 versus 358): As shown in section 1, DSX-3 RX modules have front side jacks for temporary In Service/Out of Service patching routines and testing functions. In the industry, these jacks can be small diameter 440 (also known as Mid-Size or Mini-Weco) or large diameter 358 (also known as Standard) design. DSX4R series modules and DSX-IB-MB-24L Interbay patch panels (see section 4) have 440 jacks. DSX4H series modules can be 440 or 358. Although most Service Providers/Telcos now prefer 440 jacks for all new DSX-3 module deployment, some jobs may still require DSX4H series modules with 358 jacks due to an embedded CO base of patch cords with 358 plugs. 3

4 4. Equipment requirements: This section provides part number and usage details for equipment mounted in DSX-3 relay racks. Layouts for DSX-3 Maintenance (M) and Concentration (C) racks are shown in figure 5A and 5B. Per the figure 5C lineup layout, an M rack should be placed in the middle of each five rack group with two C racks on either side. A) Relay rack (M and C): One 7 Network rack with 2 x 23 drilling code and 5 rear welded guard box. One set of 2 front and 3 rear field mount guard box material must be ordered as a separate item so that the footprint depth is 15 (2 front, 5 rack, 8 rear). See BOTC-SEG B) Fuse panel (M and C racks): One Telect 0HPGMT08R high. See BOTC-SEG C) Comm panel (M racks only): Some Service Providers/Telcos use intra-co wireless communication systems (no Comm panel in M rack). If Comm panel is required, provide one ADC COMP high. Also provide one ADC COMP-HNR-P headset/handset holder and mount on left front rack upright next to Comm panel. D) Writing shelf (M racks only): One ADC RWS23-PUT high. E) Cross Aisle panels (M racks only): ADC DSX-XA-BB-24R. 4 high. Leave one mounting plate space open below panel for cable access. These panels are required when there are non-contiguous DSX-3 lineups in the CO and may also be needed for contiguous lineups if section 11 Bridges are not used. The number of Cross Aisle panels per M rack is dependent on variable conditions (number of other DSX-3 lineups, expected quantity of permanent cross connects between lineups). F) Interbay Patch panels (M racks only): One ADC DSX-IB-MB-24L. 6 high. These panels are required when there is more than one DSX-3 M rack in the CO. The panels mult between all M racks in the DSX-3 areas (including other floors). For example, from 1 st M rack to 2 nd to 3 rd, etc within each lineup and then between lineups. This allows CO personnel to patch-in at one M rack and then patch-out at any other M rack in the CO. G) Horizontal troughs and vertical rings (M and C racks): Two ADC AUX-2D0028 troughs (8 high, 8 deep) and ten ADC DSX-4R-CBL-1 Ring kits (part number provides one set of left/right vertical rings, 6 wide and 7.5 deep). Mount rings on rear side of rack uprights at about 6 intervals (except at trough locations). Upper trough in M rack is not required if Bridge (section 11) terminates in that rack (end of Bridge takes care of trough function). Initial installation of rack should provide the full complement of troughs/rings (regardless of the number of DSX-3 panels added) so that all cross connect cords (rack to rack pass through or intra-rack) can be managed correctly. H) DSX-3 cross connect panels and modules: DSX4H panels are 6 high. DSX4R panels are 4 high. Both panel types can be mixed in the same rack. 3 port modules (has front side patching jacks for IN, OUT and Monitor-OUT) should be used for all regular conditions. 6 port modules (has front side patching jacks for IN, OUT, Monitor-OUT, Monitor-IN, X-OUT and X-IN) should only be used when special maintenance routines are required (for example, final handoff to a CLEC or IXC). 6 port modules provide additional test points that can fully identify network problems upstream or downstream from the DSX-3 module. ADC part numbers: DSX4H-W0C: 24 slot DSX-3 panel without modules or rear left/right rings. DSX-4H-MBRC: 3 port/440 jack module for DSX4H-W0C panel (up to 24 per panel). DSX-4H-MBRC-BA: 6 port/440 jack module for DSX4H-W0C panel (up to 24 per panel). DSX-4H-SBRC: 3 port/358 jack module for DSX4H-W0C panel (up to 24 per panel). DSX-4H-SBRC-BA: 6 port/358 jack modules for DSX4H-W0C panel (up to 24 per panel). DSX4R-D32: 32 slot DSX-3 panel without modules or rear left/right rings. DSX-4R-MB130: 3 port/440 jack module for odd position on DSX4R-D32 panel (up to 16 per panel). DSX-4R-MB230: 3 port/440 jack module for even position on DSX4R-D32 panel (up to 16 per panel). DSX-4R-MB160: 6 port/440 jack module for odd position on DSX4R-D32 panel (up to 16 per panel). DSX-4R-MB260: 6 port/440 jack module for even position on DSX4R-D32 panel (up to 16 per panel). 4

5 5. Relay rack and lineup layouts: BOTC-TEG-2300 GQ or 38 GQ or 38 GP or 37 Trough or Cross Aisle Bridge GP or 37 Trough or Cross Aisle Bridge GN or 36 connection (see section 11) GN or 36 connection (see section 11) GM or 35 GM or 35 GL or 34 Fuse panel GL or 34 Fuse panel GK or 33 GK or 33 GJ or 32 GJ or 32 GH or 31 GH or 31 GG or 30 Area for mounting Cross Aisle GG or 30 GF or 29 or DSX-3 panels GF or 29 GE or 28 GE or 28 GD or 27 GD or 27 GC or 26 GC or 26 GB or 25 GB or 25 GA or 24 Interbay Patch panel GA or 24 EV or 23 EV or 23 EU or 22 EU or 22 ET or 21 Comm panel (optional) ET or 21 ES or 20 Writing shelf ES or 20 ER or 19 ER or 19 EQ or 18 EQ or 18 EP or 17 EP or 17 EN or 16 EN or 16 EM or 15 EM or 15 EL or 14 EL or 14 EK or 13 Area for mounting DSX-3 EK or 13 EJ or 12 panels EJ or 12 EH or 11 (Writing shelf mounts at plate EH or 11 EG or if Comm panel is not used) EG or 10 EF or 9 EF or 9 EE or 8 EE or 8 ED or 7 ED or 7 EC or 6 EC or 6 EB or 5 EB or 5 EA or 4 EA or 4 FA or 3 FA or 3 FB or 2 FB or 2 FC or 1 Trough FC or 1 Trough FD or 0 FD or 0 2 x 23 2 x 23 FIGURE 5A DSX-3 Maintenace rack Area for mounting DSX-3 panels FIGURE 5B DSX-3 Concentration rack See section 4 See section 4 8" rear guard boxes (5" welded plus 3" field mount) " C 7.5" C 7.5" M 7.5" C 7.5" C 7.5" 7.5" 7.5" M 2" front field mount guard boxes FIGURE 5C Lineup footprint for DSX-3 racks. The 1st DSX-3 rack in every group of 5 should be an M rack. To provide a path for cross connect cords, subsequent M rack jobs (rack 08 in this example) should add empty racks (06, 07) with troughs/vertical rings between the M rack and existing C rack (05) in the lineup. 5

6 6. DS3 and STS-1 terminations: A) Signal mixture: DS3 and STS-1 terminations from NE equipment can be mixed on the same DSX-3 panel. There is no requirement that DS3 and STS-1 signals be terminated on separate DSX-3 panels. B) Tracer Lamp (TL) colors: TLs are used to identify near and far end cross connect points in the DSX-3 environment. DSX-XA-BB-24R Cross Aisle and DSX4H series DSX-3 panels (see section 4) have one TL LED for each position (24 per panel). DSX4R series DSX-3 panels have two TL LEDs (front and back of panel) for each position (64 total per panel). The DSX-3 color standard is red for DS3 and yellow for STS-1. All ADC panels with TL capability are shipped with -48V red LEDs. If the panel position usage is DS3 or unknown, the red LEDs should be left in place. If the panel position usage is STS-1, the red LEDs should be replaced with yellow LEDs. These ADC part numbers can be used to order -48V yellow LEDs (see section 7 for -24V condition): FLEDY: 1 yellow LED for DSX4H DSX-3 or DSX-XA-BB-24R Cross Aisle panel. STS-KIT-Y: Kit of 24 yellow LEDs for DSX4H DSX-3 or DSX-XA-BB-24R Cross Aisle panel. FLED-A-YEL: 1 yellow LED for DSX4R DSX-3 panel. FLED-A-KIT-YEL: Kit of 100 yellow LEDs for DSX4R DSX-3 panel. In some cases, panels with yellow LEDs may need to be converted back to red (STS-1 termination changed to DS3). These ADC part numbers can be used to order -48V red LEDs (see section 7 for -24V condition): FLEDR: 1 red LED for DSX4H DSX-3 or DSX-XA-BB-24R Cross Aisle panel. FLED-A-RED: 1 red LED for DSX4R DSX-3 panel V condition: In the early 1980s many Service Providers/Telcos deployed Bell System DSX-3 panels that had a -24V Tracer Lamp (TL) design. The DSX industry then evolved to -48V TL panels which created voltage compatibility problems (-48V was connected to -24V via the DSX-3 cross connect cord TL lead). The most common solution was to have -48V panel operation whenever possible by modifying the old -24V DSX-3 racks to -48V. In some cases, it was decided to continue -24V operation for all new DSX-3 panels in COs that had any existing -24V DSX-3. None of the following procedures: Are required in COs that have all (same or other floors) existing DSX-3, Interbay Patch and Cross Aisle panels on -48V operation. Apply to DSX4R series DSX-3 panels since their LEDs run on -8V (6800 Ohm resistor between LED and -48V panel fuse). DSX4R panels cannot be used in COs with -24V DSX-3 operation. When adding new Interbay Patch, Cross Aisle or DSX4H series DSX-3 panels in COs that have -24V DSX-3 operation (same or other floors): A) Remove -48V TL LEDs from the panel and replace with -24V LEDs using these ADC part numbers: FLEDR-24: 1 red LED for DSX-XA-BB-24R Cross Aisle, DSX-IB-MB-24L Interbay Patch or DSX4H DSX-3 panel. FLEDY-24: 1 yellow LED for DSX-XA-BB-24R Cross Aisle, DSX-IB-MB-24L Interbay Patch or DSX4H DSX-3 panel. B) Provide one ADC DSX4H-ZENER diode kit for each new panel that is powered from a -48V rack fuse panel. This step is not required if the panel will be powered from an existing -24V rack fuse panel. C) Use the -48V operation maximum amperage drain and fuse size as shown in section 13 (Wiring). Testing by ADC confirms that -24V and -48V LEDs have the same current drain. 6

7 8. Open space between relay racks: Since DSX-3 RX racks have NE cable and permanent cross connect cords on the rear side, 7.5 of open space is required between adjacent racks and the footprint depth is 15 (2 front, 8 rear guard boxes). As cross connect cord volume increases in the vertical rings, access to the NE cable area (between rack uprights) becomes more difficult from the rear side. To provide ongoing NE cable area access, front side full height vertical spacer plates should not be added between the racks. This will allow easy access to the NE cable area (by installers and CO personnel) from the front side. As always, base guard boxes should be fully extended across the 7.5 space between racks. 9. Relay rack fuse panel input power feeder source: DSX-3 racks have a fuse panel that requires an input power feeder. To prevent low amperage DSX-3 rack equipment (usually tracer lamps only) from consuming valuable BDFB output assignments, DSX-3 Concentration (C) rack fuse panel inputs should be fused from their associated DSX-3 Maintenance (M) rack. As shown in figure 5C, each M rack serves up to four C racks (two on either side). Size power inputs for new M racks to serve all projected equipment in a five rack configuration (M rack, four C racks). Feed fuse panel inputs for new C racks from their M rack fuse panel outputs using 12 AWG wire (see BOTC-SEG-0700 section 9). Size M rack fuse panel output fuses at least 125 percent of the C rack ultimate LIST 2 amperage requirement. Some embedded M rack fuse panels may not have enough output positions to feed panel equipment in their own rack and adjacent C rack fuse panel inputs. In this case, C rack fuse panel inputs must be run directly to a BDFB. 10. DSX-3 panel label requirements: DSX4H and DSX4R series DSX-3 panels require two sets of labels (one for NE cable assignments and one for cross connect assignments made by CO personnel). DSX-4R-CBL-1 ring sets (see section 4G) include labels for cross connect far end stenciling (by CO personnel) when the rings are associated with a DSX4H panel. Two labels are provided (1-12 for the right side and for the left side as viewed from the rear). If the ring association is DSX4H or unknown (full rack complement of rings is being provided for future panels), the labels should be mounted on the rings. If the rings are associated with a DSX4R panel, the labels should not be mounted (DSX4R rear side panel label will be used for cross connect designations). DSX4H panel modules have front side labels that should be used by installers to stencil NE cable assignments. Since DSX4R modules are too small for labels, DSX4R panels are shipped with two label strips (for NE stenciling) that should be mounted adjacent to the panel on the left/right front side rack uprights. 11. Cross Aisle Bridges: A) Overview: As shown in section 1, Cross Aisle Bridges can be used to support cross connect cords that run between 7 DSX-3 contiguous lineups. Non-contiguous lineups must use Cross Aisle panels per section 4E. In addition to a long list of smaller parts, Bridge assemblies consist of a swivel center section, two ramps and two horizontal troughs. The troughs are designed to mount in the standard upper trough position in DSX-3 racks (see figure 5A and 5B). When doing a Bridge retrofit in existing DSX-3 areas, engineering vendors should consult with Service Provider/Telco personnel if the upper trough position is lower than normal (may be too low for CO personnel to pass underneath installed Bridge). B) Bridge part numbers: See ADC drawing for assembly details. AUX-0X0421 (horizontal trough ends are 5 high and 5 deep). AUX-0X0422 (horizontal trough ends are 5 high and 8 deep). AUX-0X0425 (horizontal trough ends are 8 high and 5 deep). AUX-0X0420 (horizontal trough ends are 8 high and 8 deep). C) Aisle width and rack offset measurements: The aisle width capability of Bridges is defined as ramp mounting ear flange on one end to ramp mounting ear flange on the other end (not including the depth of troughs provided for each end). In other words, the rack upright to rack upright measurement must be reduced by the 7

8 Bridge s (not the existing) trough depth on both ends. If the two connecting racks are directly aligned with each other (no offset), the aisle width can be a minimum of 36 to a maximum of 49. For example, if the rack upright to rack upright measurement was 65, AUX-0X0420 could be used (assuming no offset) since each Bridge trough is 8 deep (65 minus 16 for the two troughs is 49 ). If the two connecting racks are offset from each other, the 49 no offset maximum is reduced by a.65 to 1 ratio. For each 1 of offset, the maximum aisle width is reduced by.65 on a linear scale. The maximum offset is 20. At full offset (20 ) the aisle width maximum is 36 (20 times.65 is 13 and 49 minus 13 is 36 ). At 50 percent allowable offset (10 ), the maximum aisle width is Keep in mind that the Bridge trough depth at both ends must be added to aisle width calculations when measurements are taken between rack uprights. All of the above assumes that both ends of a Bridge mount on the Cross Connect (CC) side of DSX-3 racks. When a Bridge mounts on the Non-Cross Connect (NCC) side of a DSX-3 rack, the Bridge ramp mounting ear flange is attached directly to the rack upright (using extender brackets provided with Bridge). The Bridge s trough is then used on the CC side. This means that rack upright to rack upright measurement is not reduced by the Bridge s trough depth on NCC side ends. For example, any of the Bridges in part B could be used if both ends were NCC, there was no offset and rack upright to rack upright measurement was no more than 49. Due to variables in their swivel/slide sections, some of the Bridges in part B may require an adjustment to work at certain points along the 49 (zero offset) to 36 (20 offset) range. In these cases, separately provided stand-offs (see BOTC-SEG-0600 section 11 manufacturers) can be placed between the ramp mounting ear flange and horizontal trough connection. D) Back panels: Regular DSX-3 horizontal troughs have a back panel that is fixed (cannot be removed). Bridge troughs have a removable back panel. If the Bridge mounts to a DSX-3 rack and there is no Bridge on the rack s opposite side (for cords from lineup 1 passing through lineup 2 and going on to lineup 3), the back panel should be mounted in the trough. If there is another Bridge on the rack s opposite side, the back panel should not be mounted (so that cords can go on to the next lineup). E) Blank panels: As mentioned in part C, Bridges can mount on the NCC side of a DSX-3 rack. In this case, the Bridge trough (back panel removed) is then used on the CC side. If there is not a Bridge on the CC side that goes on to another lineup, a Blank finishing panel is required on the trough s front side. The following ADC Blank panels should be used for this condition (see ADC drawing for details). AUX-0X0083 (for 5 high trough per part B). AUX-0X0085 (for 8 high trough per part B). AUX-0X0084 (for 6 high trough if needed for special conditions). F) Trough extensions: Cross connect cords within a lineup are supported by horizontal troughs and vertical rings. When cords span the gap between upper troughs in adjacent DSX-3 racks, a trough extension is required to prevent sagging of the cord bundle. The extension also helps cords make the vertical to horizontal transition. Since Bridge troughs do not come with left/right extensions, one of the following ADC Trough Extensions should be provided for each Bridge trough (match the Extension height/depth dimensions to the trough s). See ADC drawing for additional details. Each part number provides one set of left/right Extensions. The space dimension is minimum space required between DSX-3 racks. AUX-0X5037 (5 high, 5 deep, 7.5 or 5 space). AUX-0X5038 (5 high, 8 deep, 7.5 or 5 space). AUX-0X5041 (8 high, 5 deep, 7.5 or 5 space). AUX-0X5042 (8 high, 8 deep, 7.5 or 5 space). AUX-0X5047 (8 high, 5 deep, 10 space). AUX-0X5048( 8 high, 8 deep, 10 space). G) Deployment frequency: The potential number and routing of cross connects between DSX-3 lineups is difficult to forecast. With this in mind, Bridge deployment frequency becomes a unique issue for each group of lineups. Engineering vendors should consult with Service Provider/Telco personnel on this question prior to Bridge placement in new or retrofitted areas. Some of the items to be considered: Each Bridge can accommodate about C duplex cross connect cords. Not placing enough Bridges can result in abnormally long cross connect lengths (may drive the need for IORs). 32 jack DSX4R panel lineups have a higher potential for cross connect than 24 jack DSX4H panel lineups. BOTC recommends an initial consideration of one Bridge for each group of five DSX-3 racks (middle rack of five to minimize cross connect lengths). 8

9 12. Application guide for extended cross connect segments: See BOTC-SEG-0200 section 3 for an overview of DS3/STS-1 attenuation. This section 12 is a detailed continuation of section 3E. DSX-3 cross connects are defined as extended when their conductor attenuation (sum of cross connect cords and any coax between Cross Aisle panels) exceeds 1dB. As their network evolved into many COs with multiple DSX-3 lineups, many Service Providers/Telcos developed planning guidelines to minimize the impact (direct cabling of NEs to DACS/Titan DCS, strategic placement of DSX-3 lineups, lineup lengths, etc). In spite of these planning efforts, some COs now have multiple DSX-3 lineups with extended cross connects. The most cost effective method of dealing with this issue is to first evaluate a per CO, customized reduction in NE to DSX-3 coax footage limits before considering these more expensive solutions: A) Add DS3/STS-1 IOR equipment for all extended cross connect circuits. Estimated cost (CO floor space, rack, fuse panel, BDFB power, IOR equipment, cabling, vendor labor) is about $1100 per circuit. B) Add intra-co fiber spans for all extended cross connect circuits. Estimated cost is about $2500 per circuit. C) Recable all NE to DSX-3 circuits that originally used 735 coax, and have an extended cross connect, with 734 coax. This would also include changing that CO from 735 as a first choice to 734 as a first choice on all going forward NE jobs. Estimated cost is very hard to define since it involves not only recabling/new cabling efforts but also congestion problems in CO overhead and DSX-3 areas. See BOTC-SEG-0200 section 4B for exponential relationship of coax diameter and build-up impact. D) Add or grow DCS equipment. Recable all NE to DSX-3 circuits, that have an extended cross connect, to DCS. Estimated cost for this choice is also hard to define since it involves so many DCS variables. When CO DSX-3 cross connects are extended, BOTC recommends a first step review prior to the more expensive solutions shown above. This basically involves taking some of the DSX-3 to final NE RX section db allowance (in both directions so that LBO routines are not changed for field personnel per BOTC-SEG-0200 section 3A) and moving it into the middle cross connect section. Cross connects within a DSX-3 lineup or between adjacent parallel DSX-3 lineups should be considered to be within the BOTC-SEG-0200 section 3E general network condition (they are not extended). This allots up to.2db of the 1dB cross connect conductor attenuation limit to Cross Aisle panel coax between lineups. If DSX-3 lineups are not adjacent parallel, cross connects between them are extended. This requires taking some of the DSX-3 to final NE RX 4.9dB allowance and moving into the Cross Aisle coax segment. To calculate this ratio, multiply the end to end coax footage between Cross Aisle panels by.0118 (per foot db for 734C that is always required between these panels to reduce signal loss). Subtract the result from 5.1dB (total general network condition allowance for Cross Aisle coax and DSX-3 to NE RX). This provides a new DSX-3 to NE RX db limit for the CO. To find the new NE to DSX-3 footage limits, divide the new DSX-3 to NE RX db by.023 for 735C or by.0118 for 734C. See figure 12 for examples of DSX-3 general network condition and extended cross connects. If the new NE to DSX-3 734C footage limit does not cover all portions of the ultimate NE growth area, future NE placement in those areas must use one of the more expensive solutions shown above or be restricted to the new 734C footage limit. Without this, future NE to DSX-3 to NE circuits may exceed the end to end db allowance. Once a CO has established extended DSX-3 cross connects, Service Provider/Telco personnel and engineering vendors must manage the condition over time since it reduces the general network condition NE to DSX-3 footage limits shown in BOTC-SEG-0200 section 4A. 9

10 Beyond 415': All NE in this area must use one of the more expensive solutions. Beyond 382': All NE in this area must use one of the more expensive solutions. Beyond 332': All NE in this area must use one of the more expensive solutions. Up to 415': All 734 coax NE in this area are OK. All 735 coax NE in this area must use one of the more expensive solutions. Up to 382': All 734 coax NE in this area are OK. All 735 coax NE in this area must use one of the more expensive solutions. Up to 332': All 734 coax NE in this area are OK. All 735 coax NE in this area must use one of the more expensive solutions. Up to 215': All NE in this area are OK regardless of the coax type (735 or 734). Up to 196': All NE in this area are OK regardless of the coax type (735 or 734). Up to 170': All NE in this area are OK regardless of the coax type (735 or 734). DSX-3 lineup DSX-3 lineup DSX-3 lineup 17' coax between Cross Aisle panels. 50' coax between Cross Aisle panels. 100' coax between Cross Aisle panels. DSX-3 lineup DSX-3 lineup DSX-3 lineup Up to 215': All NE in this area are OK regardless of the coax type (735 or 734). Up to 196': All NE in this area are OK regardless of the coax type (735 or 734). Up to 170': All NE in this area are OK regardless of the coax type (735 or 734). Up to 415': All 734 coax NE in this area are OK. All 735 coax NE in this area must use one of the more expensive solutions. Up to 382': All 734 coax NE in this area are OK. All 735 coax NE in this area must use one of the more expensive solutions. Up to 332': All 734 coax NE in this area are OK. All 735 coax NE in this area must use one of the more expensive solutions. Beyond 415': All NE in this area must use one of the more expensive solutions. Beyond 382': All NE in this area must use one of the more expensive solutions. Beyond 332': All NE in this area must use one of the more expensive solutions. EXAMPLE 1: DSX-3 "general network condition" cross connect. DSX-3 lineups are adjacent parallel (front to front or back to back). EXAMPLE 2: Small/Moderate size CO. Cross aisle loss is.59db. NE 735 limit is 196' (5.1dB -.59dB = 4.51dB /.023 = 196). NE 734 limit is 382' (5.1dB -.59dB = 4.51dB /.0118 = 382). EXAMPLE 3: Moderate/Large size CO. Cross aisle loss is 1.18dB. NE 735 limit is 170' (5.1dB dB = 3.92dB /.023 = 170). NE 734 limit is 332' (5.1dB dB = 3.93dB /.0118 = 332). FIGURE 12 Examples of multiple DSX-3 lineup cross connect conditions. All footages shown are end to end coax (including drops to equipment) and can be same floor or between floors. 10

11 13. System connection details: A) Fuse panel: Step 1 (Single load input feeder from BDFB or M rack): See BOTC-SEG-0500 section 11 for BDFB fuse/feeder sizing responsibility and BOTC-SEG-0700 section 9 for wire material. Provide 2 two hole lugs (.25 studs on.625 centers) for input feeder connections (M rack wire size determined by vendor based on job conditions, 12 AWG wire for C racks). LIST 2 depends on planned quantity and type of panels in M rack and 4 associated C racks. Step 2 (Chassis ground): Provide 1 two hole lug (No.10 studs on.625 centers) for 6 AWG wire. Connect lug to relay rack ground using 6 AWG wire (see BOTC-SEG-0700 section 7 and 9). Step 2 (Alarms): Run 24 AWG Black and Red-Black wire pair (see BOTC-SEG-0700 section 8) from fuse panel R set NO/C wire wrap pins to CO alarm system (Dantel) status point. No connection required for V and A set pins. B) DSX4H-W0C DSX-3 cross connect panel: Step 1 (Power): Connect -48VDC and GRD lugs to rack fuse panel output position using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RTN. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminals for DSX4H-W0C end and RA484 ring terminals for fuse panel end. Maximum drain is.24 amp. Fuse at.5 amp (see BOTC-SEG-0500 section 14). If -24V condition per section 7, mount Zener diode kit with band end facing DSX4H-W0C -48VDC lug. Step 2 (Chassis ground): Connect CG lug to relay rack ground using spare 22 AWG Black wire from step 1. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminal for DSX4H-W0C end. Step 3 (Coax from NEs): Coax normally run on NE job (determines 735 versus 734 coax). Each DSX-4H module (up to 24 per panel) requires two straight BNC connectors (see BOTC-SEG-0200 section 6) for termination of NE TX/RX. NE TX connects to module OUT, NE RX connects to module IN. C) DSX4R-D32 DSX-3 cross connect panel: Step 1 (Power): Connect -48V and RET compression connectors to rack fuse panel output position using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RTN. Provide Thomas & Betts (or generic equivalent) RA484 ring terminals for fuse panel end. Even though the actual maximum drain is.64 amp, use.32 amp (prevents false loading of BDFB due to panel tracer lamps). Fuse at 1 amp. Step 2 (Chassis ground): Connect CHAS GND lug to relay rack ground using spare 22 AWG Black wire from step 1. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminal for DSX4R-D32 end. Step 3 (Coax from NEs): Coax normally run on NE job (determines 735 versus 734 coax). Each DSX-4R module (up to 32 per panel) requires two straight BNC connectors (see BOTC-SEG-0200 section 6) for termination of NE TX/RX. NE TX connects to module OUT, NE RX connects to module IN. D) DSX-XA-BB-24R cross aisle panel: Step 1 (Power): Connect -48V and RTN lugs to rack fuse panel output position using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RTN. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminals for -24R end and RA484 ring terminals for fuse panel end. Maximum drain is.24 amp. Fuse at.5 amp (see BOTC-SEG-0500 section 14). If -24V condition per section 7, mount Zener diode kit with band end facing -24R -48V lug. Step 2 (Chassis ground): Connect ground symbol lug to relay rack ground using spare 22 AWG Black wire from step 1. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminal for -24R end. Step 3 (Coax to far end cross aisle panel): Panel is not factory stenciled with IN/OUT designations. Stencil the upper BNC row as OUT and the lower row as IN on both sides of the panel. Run C coax conductors to far end cross aisle panel (see BOTC-SEG-0200 section 5). 735C not used since it increases cross connect signal loss. Roll TX and RX conductors between panels (OUT on one panel goes to IN on other). Each panel requires 48 straight BNC connectors (see BOTC-SEG-0200 section 6) for coax termination. Circuits between panels connect sequentially (1 to 1, 2 to 2, etc). Step 4 (Tracer lamp cable to far end cross aisle panel): Each panel position has two wire wrap TL pins for tracer lamp leads (only connect one of them since common). Run 12 pair 24 AWG 200A type cable to far end cross aisle panel (see BOTC-SEG-0100 section 14). Circuits between panels connect sequentially (1 to 1, 2 to 2, etc). 11

12 E) DSX-IB-MB-24L interbay patch panel: Step 1 (Power): Connect -48V and B GND lugs to rack fuse panel output position using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RTN. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminals for -24L end and RA484 ring terminals for fuse panel end. Maximum drain is.24 amp. Fuse at.5 amp (see BOTC-SEG-0500 section 14). If -24V condition per section 7, mount Zener diode kit with band end facing -24L -48V lug. Step 2 (Chassis ground): Connect ground symbol lug to relay rack ground using spare 22 AWG Black wire from step 1. Provide Thomas & Betts (or generic equivalent) RA18-6 ring terminal for -24L end. Step 3 (Coax to far end interbay patch panel): Run C coax conductors from RIGHT side of this panel to LEFT side of far end interbay patch panel (see BOTC-SEG-0200 section 5). 735C not used since it increases In- Service patching signal loss. Roll TX and RX conductors between panels (OUT on one panel goes to IN on other). Each side of each panel requires 48 straight BNC connectors (see BOTC-SEG-0200 section 6) for coax termination. Circuits between panels connect sequentially (1 to 1, 2 to 2, etc). Step 4 (Busy lamp cable to far end interbay patch panel): Run 12 pair 24 AWG 200A type cable from RIGHT side BSY wire wrap pins on this panel to LEFT side BSY pins on far end cross aisle panel (see BOTC-SEG-0100 section 14). Circuits between panels connect sequentially (1 to 1, 2 to 2, etc). F) COMP-21 panel (optional per section 4C): Step 1 (Power): Connect screw terminals 11 (-48V) and 10 (RTN) to rack fuse panel output position using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RTN. Provide Thomas & Betts (or generic equivalent) RA484 ring terminals for fuse panel end. Maximum drain is.13 amp. Fuse at.5 amp (see BOTC-SEG-0500 section 14). Step 2 (Chassis ground): Connect screw terminal 12 to relay rack ground using spare 22 AWG Black wire from step 1. Step 3 (Fusing for front side maintenance jack): Consult with Service Provider/Telco personnel about the need for this circuit (surveys show many CO personnel do not use it). If required, connect screw terminals 9 (-48V) and 8 (RTN) to rack fuse panel output position using 22 AWG Black/Red-Black wire pair (see BOTC-SEG-0700 section 8). Use Red-Black lead for -48V and Black lead for RTN. Provide Thomas & Betts (or generic equivalent) RA484 ring terminals for fuse panel end. Maximum drain is negligible. Fuse at 1.33 amp (see BOTC-SEG-0500 section 14). Step 4 (Telephone lines): Comm panel has 50 pin male connector on rear side (see BOTC-SEG-0100 section 7). Consult with Service Provider/Telco personnel on cabling method. Initial Comm panel in lineup normally runs directly to DF block or to CO backboard. Subsequent Comm panels in lineup mult to preceding Comm panel (mult limit is 3 panels). Provide the following for each Comm panel: One CSI CA T001 Bridge cable (connectorized 25 pair 24 AWG 200A type, 4 feet long). Female connector on one end plugs into male on Comm panel. Other end has two male connectors (one for cable from succeeding panel in mult and the other for cable to preceding panel in mult or direct run to DF/Backboard. One 25 pair 24 AWG 200A type cable (per BOTC-SEG-0100 section 14) as follows: If initial Comm panel in lineup (direct run), cable must be female connectorized on one end (to mate with CA T001 male). Other end is bulk (see figure 13F for telephone line circuits, lead designations, color code and DF block layout). BOTC recommends Cablcon T XXX or Great Lakes XXX factory formed cables (see BOTC-SEG-0100 section 7 for manufacturer contacts). XXX indicates footage. If subsequent Comm panel in lineup (mult condition), cable must be female connectorized on both ends (to mate with CA T001 male at this panel and preceding panel in mult). BOTC recommends Cablcon T XXX or Great Lakes XXX factory formed cables. XXX indicates footage. 12

13 Comm panel connector telephone line circuits, lead designations and color code Pin Line Lead Color Pin Line Lead Color 1 R BL-W 14 6 A BR-BK A1 26 T W-BL 39 A BK-BR SG 2 A1 O-W 15 5 L S-BK LG 1 27 A W-O 40 LG BK-S L 3 L G-W 16 R BL-Y A 6 28 LG W-G 41 T Y-BL R 4 R BR-W 17 1 SG O-Y T 2 29 T W-BR 42 Spare Y-O 5 9 A S-W 18 L G-Y 6 30 A W-S 43 LG Y-G 6 2 L BL-R 19 R BR-Y 7 31 LG R-BL 44 T Y-BR 7 3 R O-R 20 Spare S-Y 32 3 T R-O 45 Spare Y-S 8 8 A G-R 21 L BL-V 7 33 A R-G 46 LG V-BL 9 3 L BR-R 22 R O-V 8 34 LG R-BR 47 T V-O 10 R S-R 23 L G-V T R-S 48 LG V-G 11 7 A BL-BK 24 L BR-V 8 36 A BK-BL 49 LG V-BR 12 4 L O-BK 25 R S-V 9 37 LG BK-O 50 T V-S 13 R G-BK 5 38 T BK-G Comm panel telephone line circuit layout on portion of Conventional DF block. View is from block's front (jumper) side FIGURE 13F Comm panel connector wiring and DF block layout. 13