Example Transport Engineering Guide (TEG): DSX-1 Rear Cross...

BOTC-TEG-2290

Example Transport Engineering Guide (TEG): DSX-1 Rear Cross Connect

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 Equipment requirements 4

4 Relay rack and lineup layouts 5

5 Relay rack fuse panel input power feeder source and peak/LIST 2 amperage

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 (32 per panel). The DSX-3 color standard is red for DS3 and yellow for

STS-1.

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BOTC-TEG-2300

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 11 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 11 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.

6

6 DSX-1 panel label requirements 6

7 Cross Aisle Bridges 6-7

8 Application guide for extended cross connect segments 8-9

9 System connection details 10-12

Issue Revisions Date

1 Original release of Bill Oakes Engineering Guideline for DSX-1. December 8, 1988

20 Revise into Word format. August 17, 2007

21 Change Data Sheet weight for Di-G2CU1 panel from 10 to 28 pounds due to error in ADC documentation. Overall rack weight changes from 320 to 608.

October 2, 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)

[email protected], 831-476-0453

Copyright 1989. All rights reserved.

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BOTC-TEG-2290

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 Requirement

Weight 608 pounds

Timing (BITS) N/A

Alarms 1 discrete

Remote

managementN/A

DF blocks See remarks

PWFYAL2CAA

T3MYAZ1CAA

T3MYAWJCAA

T1JYABHBAA

None

TECYAH7HAA ADC COMP-21 comm panel.

CLEI codes (see

BOTC-SEG-0600

section 4)

Nominal/LIST 1

amperage at

52V

N/A

LIST 1 does not apply since power requirement is for occasional use of

panel tracer lamps only. LIST 2 must account for maximum probable

activation.

Heat

dissipationN/A

Does not apply since heat is a function of LIST 1. See BOTC-SEG-0600

section 8.

ADC DSX-IB-23A DSX-1 interbay patch panel.

No timing requirement for DSX-1 racks.

1 status point required on CO alarm system for DSX-1 rack fuse panel

alarm

Normally no DF connection for DSX-1 racks. Possible connection for

optional Comm panel telephone lines per section 9E.

No Ethernet or RS232 TL1 remote management requirements for DSX-1

racks.

Telect 0HPGMT07R fuse panel.

ADC Di-G2CU1 DSX-1 cross connect panel.

ADC DSX-IB-23B DSX-1 interbay patch panel.

ADC DSX-CAP-BEST/100 DSX-1 cross aisle panel.

Peak/LIST 2

amperage at

42.6V

See remarks

Per section 3 and figure 4C, only middle Maintenance (M) rack of every 5

has single load BDFB feed. M rack LIST 2 is 20 amps per section 5.

Data sheet for DSX-1 rear cross connect relay rack

Footprint

Remarks

One relay rack: 120 pounds. One fuse panel: 10 pounds. Two troughs: 30

pounds. Worst case mix of equipment shelves/panels/units (16 Di-G2CU1

panels at 28 pounds each): 448 pounds.

33.5" wide x 15"

deep

26" wide rack. 7.5" wide spacer between adjacent racks. 5" wide spacer at

ultimate end of lineup. 2" deep front guard box. 8" deep rear guard box.

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BOTC-TEG-2290

1. Overview:

DSX-1 panels are used to terminate DS1 (1.544 Mb/s) signals that require a manual cross connect. Each panel has

84 fixed (not field removable) jack circuits. The circuits have front side IN, OUT, Monitor-OUT Bantam jacks for

temporary In-Service/Out-of-Service patching routines and various testing functions. The panels have two sets of

rear side wire wrap pinfields for NE cable and permanent cross connects. This type of DSX-1 panel design is called

Rear Cross Connect (RX). DSX-1 circuits with terminated NE cable are referred to in this TEG as “active jacks”.

Five wire (TX/RX pairs and one tracer lamp lead) jumpers are used to complete the permanent cross connect

between DSX-1 panel circuits. These jumpers are supported by rear side vertical rings and horizontal troughs

within a given DSX-1 lineup. When 7’ DSX-1 lineups are contiguous, low cable racks (called Bridges in section 7)

can be used to support the jumpers that run between lineups (continuous jumper from active jack in one lineup to

active jack in other lineup). Non-contiguous DSX-3 lineups must use Cross Aisle panels (jumper from active jack in

each lineup to Cross Aisle panel in same lineup with engineered cable between Cross Aisle panels). The total cross

connect length (active jack to active jack including any cross aisle cable) has a footage limit that is related to NE

cable length limits (see BOTC-SEG-0100 section 5 and 6). When the cross connect limit is exceeded, Intra-CO fiber

spans or ADC DS1 IntraOffice Repeaters (IOR) may be required. Section 8 provides an Application Guide for DSX-1

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 Repeater (BR) 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 needed 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 cable between panels).

Since the 1980s, DSX-1 cross connect and Interbay Patch panels have been deployed with small diameter Bantam

front side patching jacks. Since many older embedded panels have large diameter 310 (also known as Longframe)

patching jacks, some COs may require three types of various length patch cords (Bantam/Bantam, Bantam/310

and 310/310).

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 jumpers (if DSX-1) or

internal electronic switching (if DCS).

TX and RX cable between DSX-1 Cross Aisle panels must also roll since the cross connect jumper roll (NE DSX-1

circuit to Cross Aisle pins) at both ends will cancel each other out. DSX-1 Interbay Patch panel cabling has this

same requirement (roll cable between panels since NE DSX-1 jack to Interbay Patch jack patch cord rolls at both

ends will cancel each other out).

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BOTC-TEG-2290

3. Equipment requirements:

This section provides part number and usage details for equipment mounted in DSX-1 relay racks. Layouts for

DSX-1 Maintenance (M) and Concentration (C) racks are shown in figure 4A and 4B. Per the figure 4C 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-0600.

B) Fuse panel (M and C racks): One Telect 0HPGMT07R. 1.75” high. See BOTC-SEG-0500.

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-21. 3.5” 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. 1.75” high.

E) Cross Aisle panels (M racks only): ADC DSX-CAP-BEST/100. 4” high. These panels are required when there

are non-contiguous DSX-1 lineups in the CO and may also be needed for contiguous lineups if section 7 Bridges are

not used. The number of Cross Aisle panels per M rack is dependent on variable conditions (number of other DSX-

1 lineups, expected quantity of permanent cross connects between lineups). Panel mounts on rear side rack

uprights with front of panel (4” x 4” ring/trough side) facing the rear aisle.

F) Interbay Patch panels (M racks only): One ADC DSX-IB-23A (25 circuit, 4” high) or DSX-IB-23B (28 circuit,

3.5” high). In COs with embedded 25 circuit Interbay Patch panels, continuation of the 25 circuit pattern is

recommended. Introduction of 28 circuit panels (into existing 25 circuit mult) results in a circuit 26-28 “patch in”

with no “patch out” capability at any of the 25 circuit panel locations. These panels are required when there is

more than one DSX-1 M rack in the CO. The panels mult between all M racks in the DSX-1 areas (including other

floors). For example, from 1st M rack to 2nd to 3rd, 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 (M and C racks): Two ADC DSX-CT-PB troughs (6” high, 8” deep). Upper trough in M rack

is not required if Bridge (section 7) terminates in that rack (end of Bridge takes care of trough function). Initial

installation of rack should provide the full complement of troughs (regardless of the number of DSX-1 panels

added) so that all cross connect jumpers (rack to rack pass through or intra-rack) can be managed correctly.

H) DSX-1 cross connect panels (M and C racks): ADC Di-G2CU1. 4” high. Quantity depends on job condition.

Mount from plate 3 upward as shown in figure 4A and 4B. Each panel has 84 fixed (not field removable) light

weight jack modules. Panels with removable jack modules (ADC D1M-1F0001 for example) are not recommended

since the modules may become partially unseated when CO personnel remove front side patch cords.

J) Vertical jumper rings (M and C racks): Rings are used for vertical management of rear side permanent cross

connect jumpers. Di-G2CU1 (part H) panels are shipped with two 4” x 4” rings that must be mounted on the

panel’s left/right rear side by installation. When DSX-1 racks are only equipped with the first few panels (lower

part of rack) there is usually no need for separate vertical rings (on the top portion of rack) since:

1. Jumpers run through a rack on horizontal troughs (vertical rings not used).

2. Jumpers associated with lower panels run through rings (provided with panels) to a lower trough in most cases.

3. Jumpers from the upper trough to lower panels can be run across the trough so they naturally fall into a vertical

column down to the panel rings.

In some cases, CO personnel may not realize that condition 3 jumpers should be run across the upper trough. This

can create a slanted jumper column between two DSX-1 racks. To prevent these slanted columns from occurring,

two (left/right) temporary ADC HDW-100433 ring assemblies should be provided when racks are only equipped

with the first few panels. Mount on rear of rack uprights just below the upper trough. When the rack fills with

panels, these temporary rings can be removed and reapplied on other new partially filled DSX-1 racks.

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BOTC-TEG-2290

4. Relay rack and lineup layouts:

GQ or 38 GQ or 38

GP or 37 GP or 37

GN or 36 GN or 36

GM or 35 Fuse panel GM or 35 Fuse panelGL or 34 GL or 34

GK or 33 GK or 33

GJ or 32 GJ or 32

GH or 31 GH or 31

GG or 30 GG or 30GF or 29 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 GA or 24

EV or 23 EV or 23

EU or 22 EU or 22

ET or 21 ET or 21

ES or 20 ES or 20

ER or 19 Writing shelf ER or 19EQ 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 EK or 13

EJ or 12 EJ or 12

EH or 11 EH or 11

EG or 10 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 FC or 1

FD or 0 FD or 0

2 x 23 2 x 23

FIGURE 4A FIGURE 4B

DSX-1 Maintenace rack DSX-1 Concentration rack

See section 3 See section 3

Trough

Trough or Cross Aisle Bridge

connection (see section 7)

Area for mounting DSX-1

panels

Trough or Cross Aisle Bridge

connection (see section 7)

Trough

Area for mounting DSX-1

panels

(Writing shelf mounts at plate

21 if Comm panel is not used)

Comm panel (optional)

Interbay Patch panel

Area for mounting Cross Aisle

or DSX-1 panels

01 02 03 04 05 06 07 08

5" C 7.5" C 7.5" M 7.5" C 7.5" C 7.5" 7.5" 7.5" M

8" rear guard boxes (5" welded plus 3" field mount)

FIGURE 4CLineup footprint for DSX-1 racks. The 1st DSX-1 rack in every group of 5 should be

an M rack. To provide a path for cross connect jumpers, subsequent M rack jobs

(rack 08 in this example) should add empty racks (06, 07) with upper/lower

troughs between the M rack and existing C rack (05) in the lineup.

2" front field mount guard boxes

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BOTC-TEG-2290

5. Relay rack fuse panel input power feeder source and peak/LIST 2 amperage: DSX-1 racks have a fuse panel that requires an input power feeder. To prevent low amperage DSX-1 rack

equipment (usually tracer lamps only) from consuming valuable BDFB output assignments, DSX-1 Concentration

(C) rack fuse panel inputs should be fused from their associated DSX-1 Maintenance (M) rack. As shown in figure

4C, 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.

Tracer Lamps (TL) on DSX-1 panels have a peak/LIST 2 drain of .01 amps (.84 amps for 84 circuit panel if all TLs

are activated). Since it’s very unlikely that all TLs for all panels in a DSX-1 rack will be activated at the same time,

using a true LIST 2 total drain value would falsely load BDFBs. BOTC recommends a design of 4 amps LIST 2 for

DSX-1 C racks and M racks. This sums up to a 20 amp LIST 2 for the M rack BDFB power feeder (since M rack

serves itself and four C racks).

6. DSX-1 panel label requirements: DSX-1 panels require two sets of labels (one for NE cable assignments and one for cross connect assignments made

by CO personnel). Di-G2CU1 panels (see section 3H) include three label sets. Installers should mount one set of

labels (.25” high strips) below the front side LEDs and use them for NE cable assignments. The second label set

should be mounted on left and right front side flip/back panels (three per side) so they can be optionally used by

CO personnel for cross connect assignments. Mount the third label (1.25” high, 20.5” wide) on the panel’s rear side

jumper trough so it provides an alternate choice (if preferred by CO personnel) for cross connect designations.

7. Cross Aisle Bridges: A) Overview: As shown in section 1, Cross Aisle Bridges can be used to support cross connect jumpers that run

between 7’ DSX-1 contiguous lineups. Non-contiguous lineups must use Cross Aisle panels per section 3E. 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-1 racks (see

figure 4A and 4B). When doing a Bridge retrofit in existing DSX-1 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 1124437 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

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 42.5”. Keep in mind

that the Bridge trough depth at both ends must be added to aisle width calculations when measurements are taken

6

BOTC-TEG-2290 between rack uprights. All of the above assumes that both ends of a Bridge mount on the Cross Connect (CC) side

of DSX-1 racks. When a Bridge mounts on the Non-Cross Connect (NCC) side of a DSX-1 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-1 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-1 rack and there is no Bridge on the rack’s

opposite side (for jumpers 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 jumpers 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-1 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 1098038 for details). AUX-0X0083 (for 5” high trough per part

B). AUX-0X0085 (for 8” high trough per part B).

F) Trough extensions: Cross connect jumpers within a lineup are supported by horizontal troughs and vertical

rings. When jumpers span the gap between upper troughs in adjacent DSX-1 racks, a trough extension is required

to prevent sagging of the jumper bundle. The extension also helps jumpers 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 1124436 for additional details. Each part number provides one set of left/right

Extensions. The space dimension is minimum space required between DSX-1 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).

G) Deployment frequency: The potential number and routing of cross connects between DSX-1 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 5000 five wire jumper circuits.

Not placing enough Bridges can result in abnormally long cross connect lengths (may drive the need for IORs).

84 jack panel lineups have a higher potential for cross connects than embedded 56 jack panel lineups.

BOTC recommends an initial consideration of one Bridge for each group of five DSX-1 racks (middle rack of five

to minimize cross connect lengths).

7

BOTC-TEG-2290 8. Application guide for extended cross connect segments: See BOTC-SEG-0100 section 5 for an overview of DS1 attenuation. This section 8 is a detailed continuation of -

0100 section 5E. DSX-1 cross connects are defined as “extended” when their conductor attenuation (sum of cross

connect jumpers and any cable between Cross Aisle panels) exceeds 1dB. As their network evolved into many COs

with multiple DSX-1 lineups, many Service Providers/Telcos developed planning guidelines to minimize the impact

(direct cabling of NEs to DACS/Titan DCS, strategic placement of DSX-1 lineups, lineup lengths, etc). In spite of

these planning efforts, some COs now have multiple DSX-1 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-1 cable

footage limits before considering these more expensive solutions:

A) Add intra-CO fiber spans for all extended cross connect circuits. Estimated cost is about $165 per circuit based

on the use of Fujitsu FW4100ES.

B) Add ADC DS1 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 $260 per circuit.

C) Recable all NE to DSX-1 circuits that originally used 1249C 26 AWG cable, and have an extended cross connect,

with 600C 22 AWG cable. This would also include changing that CO from 1249C as a first choice to 600C 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-1 areas. See BOTC-SEG-

0100 section 6B for exponential relationship of cable diameter and build-up impact.

D) Add or grow DCS equipment. Recable all NE to DSX-1 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-1 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-1 to final NE RX section dB allowance (in

both directions so that LBO routines are not changed for field personnel per BOTC-SEG-0100 section 5) and

moving it into the middle cross connect section. These type of cross connects should be considered within the

BOTC-SEG-0100 section 5E “general network condition” (they are not extended):

Within a given DSX-1 lineup.

Between several DSX-1 lineups that are Bridged together (per section 7) with no more than 120 feet of cross

connect jumpers from one DSX-1 panel to another.

Between DSX-1 lineups that are connected with up to 100 feet of 22 AWG cross aisle cable (see section 9C).

This keeps the conductors (jumpers and any engineered cross aisle cable) within the 1dB cross connect

attenuation limit. If DSX-1 lineup separation is beyond the these conditions, cross connects between them are

extended. This requires taking some of the DSX-1 to final NE RX 2.5dB allowance and moving into the Cross Aisle

cable segment. To calculate this ratio, multiply the end to end cable footage between Cross Aisle panels by .0042

(per foot dB for 600C that is always required between these panels to reduce signal loss). Subtract the result from

2.92dB (total “general network condition” allowance for cross aisle cable and DSX-1 to NE RX). This provides a

new DSX-1 to NE RX dB limit for the CO. To find the new NE to DSX-1 footage limits, divide the new DSX-1 to NE RX

dB by .0065 for 1249C or by .0042 for 600C. See figure 8 for examples of DSX-1 “general network condition” and

extended cross connects.

If the new NE to DSX-1 600C 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

600C footage limit. Without this, future NE to DSX-1 to NE circuits may exceed the end to end dB allowance.

Once a CO has established extended DSX-1 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-1

footage limits shown in BOTC-SEG-0100 section 6A.

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BOTC-TEG-2290

Up to 595':

All 600C cable NE in this area OK. All

1249C cable NE in this area must use

one of the more expensive solutions.

Up to 495':




Up to 395':




DSX-1 lineup DSX-1 lineup DSX-1 lineup

DSX-1 lineup DSX-1 lineup DSX-1 lineup

Beyond 495':

All NE in this area must use one of the

more expensive solutions.

Up to 320':

All NE in this area are OK regardless

of the cable type (1249C or 600C).

Up to 320':



Up to 495':




200' cable between cross aisle

panels.

Beyond 395':



Up to 255':



Up to 255':



Up to 395':




300' cable between cross aisle

panels

Beyond 595':



Up to 380':



Up to 380':



Up to 595':




Bridged lineups with no more than

120' of cross connect jumpers or up

to 100 feet of cross aisle cable.

FIGURE 8

Examples of multiple DSX-1 lineup cross connect conditions.

All footages shown are end to end cable (including drops to equipment) and can be same floor or between floors.

EXAMPLE 1:

DSX-1 "general network condition"

cross connect as described in section

8 and BOTC-SEG-0100 section 5.

Beyond 595':



Beyond 495':



EXAMPLE 2:

Moderate size CO. Cross aisle loss is

.84dB. NE 1249C limit is 320' (2.92dB -

.84dB = 2.08dB / .0065 = 320). NE

600C limit is 495' (2.92dB - .84dB =

2.08dB / .0042 = 495).

Beyond 395':



EXAMPLE 3:

Large size CO. Cross aisle loss is

1.26dB. NE 1249C limit is 255'

(2.92dB - 1.26dB = 1.66dB / .0065 =

255). NE 600C limit is 395' (2.92dB -

1.26dB = 1.66dB / .0042 = 395).

9

BOTC-TEG-2290

9. 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). 20 amp recommended LIST 2 for M rack per section 5.

Step 2 (Chassis ground): Provide 1 two hole lug (No.10 studs on .625” centers) for 6 AWG wire. Lug must have

45 degree tongue due to adjacent GMT output terminal block (cannot use flat lug) and panel rear cover (cannot use

90 degree lug). 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) Di-G2CU1 DSX-1 cross connect panel: Step 1 (Power): Connect -48V 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 Di-G2CU1 end and RA484 ring terminals for fuse panel end.

Maximum drain is .84 amp. Fuse at 1.33 amp (see BOTC-SEG-0500 section 14).

Step 2 (Chassis ground): Connect CHASSIS GRD 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 Di-G2CU1 end. Ensure that the

factory provided jumper between CHASSIS GRD and SHIELD GRD lugs remains in place since this provides a

ground for the front side jack sleeve connection (mates with patch cord sleeve lead).

Step 3 (Cables from NEs): Cables normally run on NE job (determines 1249C versus 600C cable). Ground cables

at NE end (do not ground at DSX-1 panel end). NE TX pair connects to Di-G2CU1 OUT T/R wire wrap pins, NE RX

connects to Di-G2CU1 IN T/R wire wrap pins.

C) DSX-CAP-BEST/100 cross aisle panel:

Step 1 (Chassis ground): Panel has two CHASSIS GND lugs but no connection required since panel is not fused

and GND lugs are not needed for cable drain wire path to ground.

Step 2 (TX/RX cables to far end cross aisle panel): Run four (two TX, two RX) 50 pair 600C cables to far end cross aisle panel (see BOTC-SEG-0100 section 14). Connect cable drain wires to rack ground at one end only (do not ground both ends). 1249C not used since it increases cross connect signal loss. Roll TX and RX cables between panels (OUT on one panel goes to IN on other). Panel connections are wire wrap. Circuits between panels connect sequentially (1 to 1, 2 to 2, etc). Panel mounts on rear side rack uprights with front of panel (4” x 4” ring/trough side) facing the rear aisle. 600C cables connect to panel’s rear side (facing front aisle). Step 3 (Tracer lamp cable to far end cross aisle panel): Panel has 100 wire wrap TL pins for tracer lamp leads. Run one 50 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). D) DSX-IB-23A and -23B interbay patch panels:

Step 1 (Power): Connect -48V and 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 panel end and RA484 ring terminals for fuse panel end.

Maximum drain is .28 amp. Fuse at .5 amp (see BOTC-SEG-0500 section 14).

Step 2 (Chassis ground): Connect CHASSIS GRD 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 panel end. Ensure that the

factory provided jumper between CHASSIS GRD and SHIELD GRD lugs remains in place since this provides a

ground for the front side jack sleeve connection (mates with patch cord sleeve lead).

10

BOTC-TEG-2290 Step 3 (IN/OUT cables to far end interbay patch panel): Run two 25 pair (if -23A panel) or 28 pair (if -23B

panel) 600C cables from LEFT side of this panel to RIGHT side of far end interbay patch panel (see BOTC-SEG-0100

section 14). 1249C not used since it increases In-Service patching signal loss. Roll IN and OUT cables between

panels (OUT A/B pins on one panel go to IN C/D pins on other). Connect cable drain wires to rack ground at one

end only (do not ground both ends). Circuits between panels connect sequentially (1 left to 1 right, etc).

Step 4 (Busy lamp cable to far end interbay patch panel): Run 25 pair (if 23A panel) or 28 pair (if 23B panel)

24 AWG 200A type cable from LEFT side E/F pins on this panel to RIGHT side E/F pins on far end cross aisle panel

(see BOTC-SEG-0100 section 14). Do not roll leads (E pin BY, F pin G) within pair. Circuits between panels connect

sequentially (1 left to 1 right, etc).

Step 5 (False load resistors): To ensure compatibility for all new or embedded NE to NE patching combinations,

a 100 Ohm false load is required across left and right side IN pins (C, D) that are unterminated (no cable

connection). Provide and mount one ADC HDW-101072 resistor for each set of unterminated IN pins.

E) COMP-21 panel (optional per section 3C):

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 CA40004130T001 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

CA40004130T001 male). Other end is bulk (see figure 9E for telephone line circuits, lead designations, color

code and DF block layout). BOTC recommends Cablcon T1523-0337-XXX or Great Lakes 97224-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 CA40004130T001 male at this panel and preceding panel in mult). BOTC recommends Cablcon

T1523-0339-XXX or Great Lakes 97226-XXX factory formed cables. –XXX indicates footage.

11

BOTC-TEG-2290

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 L S-BK LG

27 A W-O 40 LG BK-S L

3 L G-W 16 R BL-Y A

28 LG W-G 41 T Y-BL R

4 R BR-W 17 1 SG O-Y T

29 T W-BR 42 Y-O

5 9 A S-W 18 L G-Y

30 A W-S 43 LG Y-G

6 L BL-R 19 R BR-Y

31 LG R-BL 44 T Y-BR

7 3 R O-R 20 S-Y

32 3 T R-O 45 Y-S

8 8 A G-R 21 L BL-V

33 A R-G 46 LG V-BL

9 L BR-R 22 R O-V

34 LG R-BR 47 T V-O

10 R S-R 23 L G-V

35 T R-S 48 LG V-G

11 7 A BL-BK 24 L BR-V

36 A BK-BL 49 LG V-BR

12 L O-BK 25 R S-V

37 LG BK-O 50 T V-S

13 R G-BK

38 T BK-G

FIGURE 9E

Comm panel connector wiring

and DF block layout.

5

6

6

7

7

Spare

Comm panel telephone line circuit layout on

portion of Conventional DF block.

View is from block's front (jumper) side.

1

2 3 4 5 6 7 8 9

1

Comm panel connector telephone line circuits, lead

designations and color code

2

8

9

8

Spare

Spare

2

3

4

4

5

9

12

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