Installation and Configuration, Release 4.1
Cabling Summary
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Cabling Summary

Cabling Summary

Introduction

This appendix provides details on the cabling required to install the MGX 8220 shelf.

Note In all cable references, the transmit direction is from the MGX 8220 shelf, receive is to the MGX 8220 shelf.

T3 Trunk Cabling

Trunk cables connect the T3 port on the BNM backcard to the BNI T3 port on the collocated
BPX node. Refer to Table A-1 and Table A-2 for details.


Table A-1: Trunk Cables
Cable Parameter Description

Type:

75-ohm coax cable (RG-59 B/U for short runs, AT&T 734A for longer runs). Two per T3 line (XMT and RCV).

Max. Length:

450 feet max. between the BPX node and the MGX 8220 shelf.

Connector:

Terminated in male BNC; Rx is received from trunk, Tx is transmitted to trunk.

Table A-2: T3 Connector Pin Assignments
Connector Description

Rx BNC

Receive T3 from trunk

Tx BNC

Transmit T3 to trunk

IMATM T1/E1 Connectors

The IMATM backcard can have eight RJ-48 connectors or eight SMB connectors. Connections are made through short pigtail cables, two adapter cables, and two Y-cables for use with redundant IMATM cards. (Refer to Table A-1.)


Figure A-1: IMATM T1/E1 Pigtail Cables


Frame Relay Cabling

T1 Cabling

Trunk cables connect the customer DSX-1 crossconnect point or T1-E1 Channel Service Unit to the MGX 8220 node at the FRSM T1 back card (DB15-4T1). Refer to Table A-3 and Table A-4 for details.


Table A-3: T1 Trunk/Circuit Line Cabling Specification
Cable Parameter Description

Cable Type:

Western Electric 22 AWG, ABAM individually shielded twisted pair
(100 ohm balanced). Two pair per T1 line (1 transmit and 1 receive).

Cable Connector:

Male DB-15 subminiature.

Max. Cable Length:

533 ft. (162 m) maximum between the MGX 8220 shelf and the first repeater or CSU. Selection of cable length equalizers.

Table A-4: T1 Connector Pin Assignments
Pin No. Description

1

Transmit, Tip

2

Transmit Pair Shield

3

Receive, Tip

4

Receive Pair Shield

9

Transmit, Ring

11

Receive, Ring
Note Transmit direction is towards the T1 trunk.

E1 Cabling

BNC Connector

E1 trunk cables connect the customer DSX-1 crossconnect point or E1 Channel Service Unit to the MGX 8220 node at the FRSM E1 back card (BNC-4E1). (Refer to Table A-5 and Table A-6.)


Table A-5: E1 Trunk/Circuit Line Cabling Specification
Cable Parameter Description

Cable Type: BNC-4E1

75-ohm coax cable for unbalanced connection. Two cables/pairs (1 transmit, 1 receive) per E1 line.

Cable Connector:

Two female BNC for unbalanced connection; male DB15 for balanced connection. Refer to Tables A-2 and A-3 for pinouts.

Max. Cable Length:

Approx. 100 meters maximum between the MGX 8220 shelf and the first repeater or CSU. Equalizer for cable length.

Table A-6: E1 Connector Pin Assignments (unbalanced)
Connector Description

Rx BNC

Receive E1 from trunk

Tx BNC

Transmit E1 to trunk

DB15 Connector

E1 trunk cables connect the customer DSX-1 crossconnect point or E1 Channel Service Unit to the MGX 8220 node at the FRSM E1 back card (DB15-4E1). (Refer to Table A-7 and Table A-8.)


Table A-7: E1 Trunk/Circuit Line Cabling Specification
Cable Parameter Description

Cable Type: Db15-4E1

Western Electric 22 AWG, ABAM individually shielded twisted pair
(120 ohm balanced). Two pair per T1 line (1 transmit and 1 receive).

Cable Connector:

Male DB-15 subminiature.

Max. Cable Length:

533 ft. (162 m) maximum between the MGX 8220 shelf and the first repeater or CSU. Selection of cable length equalizers.

Table A-8: E1 Connector Pin Assignments
Pin No. Description

1

Transmit, Tip

2

Transmit Pair Shield

3

Receive, Tip

4

Receive Pair Shield

9

Transmit, Ring

11

Receive, Ring
Note Transmit direction is towards the E1 trunk.

X.21 Port Connectors

The X.21 ports use DB-15 female connectors (DCE type according to ISO 4903).
(Refer to Table A-9 .)


Table A-9: Pinouts for X.21 DB-15 Connectors
Pin No. Name Signal Function Polarity Signal Source

2

TA

Transmit Data

+

DTE

9

TB

-

4

RA

Receive Data

-

DCE

11

RB

-

6

SA

Clock

+

DCE

13

SB

-

5

IA

Indication

+

DCE

12

IB

-

3

CA

Control

+

DTE

10

CB

-

8

SG

Signal Ground

1

FG

Frame Ground

HSSI Port Connectors

The HSSI (High Speed Serial Interface) port uses a female SCSI-II connector (Connector type according to ANSI/TIA/EIA-613). (Refer to Table A-10.)


Table A-10: Pinouts for SCSI-II Connector
Pin No. Name Signal Function Polarity Signal Source

11

SD

Send Data

+

DTE

36

-

4

RD

Receive Data

+

DCE

29

-

6

ST

Send Timing

+

31

-

2

RT

Receive Timing

+

27

_

6

TT

Terminal Timing

+

DCE

13

-

3

CA

DCE Available

+

DCE

28

-

8

TA

DTE Available

+

DTE

33

-

10

LA

Loop Ckt A

+

DTE

35

-

12

LB

Loop Ckt B

+

DTE

37

-

5

LC

Loop Ckt C

+

DCE

30

-

1,26,7,32,13,38,19,44,25,50

SG

Signal Ground

Cabling for RJ-48 Connectors on T1 and E1 Ports

For back cards employing RJ-48 connectors on their T1 and E1 ports, each connector has:

  • Transmit TIP pin

  • Transmit RING pin

  • Receive TIP pin

  • Receive RING pin

  • Two pins for shielded ground

The pins are wired as shown in Figure A-2.


Figure A-2: RJ-48 Connectors


DC Power Cabling

DC Power connections are made to the DC Power Entry Modules at the rear of the MGX 8220 shelf. (See Figure A-3.) Refer to Table A-11 and Table A-12 for acceptable cable and wire types.

DC wiring is generally provided by the customer. (Refer to Table A-11.)


Table A-11: DC Power Wiring
Cable Parameter Description

Wiring:

Three conductor, 12 AWG recommended wire gauge, min. 60ºC insulation rating, copper conductors only. Solid or stranded wires. Wire insulation stripped back 0.25" (6 mm) at the MGX 8220 connector end.

Connection:

EURO Block.

Figure A-3: DC Power Connections


AC Power Cabling

AC power cables may be provided by the customer or ordered from Cisco. Several standard cables are available. (Refer to Table A-12.) AC cables with other plugs or different lengths may be special ordered. For users who wish to construct their own power cables, the cable must mate with an IEC320 16/20A male receptacle on the rear of the AC power module.


Table A-12: AC Power Cables
Cable Parameter Description

Cable:

Provided with 8 feet (2.3 m) of 3-conductor wire with plug.

Plug: customer end

20 A NEMA L620, 3-prong plug (domestic)
13 A 250 Vac BS1363, 3-prong fused plug (UK, Ireland)
CEE 7/7 (Continental Europe)
AS3112 (Australia/New Zealand)
CEI23-16/VII (Italy)

Control and Clock Cabling

Maintenance and Control Ports

The control ports are used to connect one of the nodes in the network to a control terminal, workstation, or modem connections for remote alarm reporting or system monitoring. Refer to
Table A-13 and Table A-14 for details on these cables.


Table A-13: Maintenance and Control Port Cabling
Cable Parameter Description

Interface:

RS-232 DCE ports.

Suggested Cable:

24 AWG, 25-wire. A straight-through RS-232 cable is used for a terminal or printer connection. A null modem cable may be needed when interfacing with modems on either port.

Cable Connector:

DB-25, subminiature, male. Table A-14 contains a list of the port pin assignments.

Max. Cable Length:

50 feet (15 m)

Table A-14: Maintenance and Control Port Pin Assignments
Pin No. Name Source Description

1

FG

both

Frame Ground

2

TxD

DTE

Transmit Data

3

RxD

DCE

Receive Data

4

RTS

DTE

Request to Send

5

CTS

DCE

Clear to Send

6

DSR

DCE

Data Set Ready

7

SG

both

Signal Ground

8

CD

DCE

Carrier Detect

181

LL

DTE

Local loop

20

DTR

DTE

Data Term Ready

211

RL

DTE

Remote loop

221

RI

DCE

Ring indicator
1Used on control port cable only.

Modem Cable

Figure A-4 shows a modem cable that is used for connecting modems to the MGX 8220 control and maintenance ports.


Figure A-4: Null Modem Cable


External Clock Input Cabling

The external clock input cable connects the external clock inputs through the T3E3-D, T3E3-B and SMF-155 EXT. TMG. connectors. The clock may be 1.544 Mbps for T3E3-D or 2.048 Mbps for T3E3-D. (Refer to Table A-15 through Table A-18.)

T1/E1 Clock Cabling

The DB15 clock port can be used for accepting a T1 or E1 BITS clock input.


Table A-15: External Clock Cabling—T3E3-D or SMF-155
Cable Parameter Description

Cable Type:

Western Electric 22 AWG, ABAM individually shielded twisted pair (100 ohm balanced). One pair per T1 line (1 receive).

Cable Connector:

Male DB-15 subminiature. Refer to Table A-16 for pinouts.

Max. Cable Length:

533 ft. (162 m) maximum between the MGX 8220 shelf and the first repeater or CSU. Selection of cable length equalizers is used. Wire buildout is required.

Table A-16: T1 Connector Pin Assignments for EXT. TMG.
Pin No. Description

1

2

Transmit Pair Shield

3

Receive, Tip

4

Receive Pair Shield

9

11

Receive, Ring

E1 Clock Cabling

T3E-B, T3E3-D, or SMF-155


Table A-17: E1 Clock Cabling—T3E3-B
Cable Parameter Description

Cable Type

75-ohm coax cable for unbalanced connection. One cable pair (1 receive) per
E1 clock input.

Cable Connector:

One female BNC for unbalanced connection; male DB15 for balanced connection.

Max. Cable Length:

Approx. 100 meters maximum between the MGX 8220 shelf and the first repeater or CSU. Equalizer for cable length.

Table A-18: E1 Connector Pin Assignments for EXT.TMG (unbalanced)
Connector Description

Rx BNC

Receive E1 from trunk

External Alarm Cabling

This cable (refer to Table A-19) is for connecting network alarm outputs to the LM-BNM ALARM OUTPUT connector only. Table A-20 lists the pinouts for the network alarm outputs.


Table A-19: External Alarm Cabling
Cable Parameter Description

Interface:

Dry-contact relay closure.

Wire:

24 AWG, shielded, 6-pair.

Connector:

DB-15, Subminiature, male.

Table A-20: Network Alarm Pin Assignments
Pin No. Alarm Description

1

Audible—Major

Normally open

2

Common

9

Normally closed

4

Visual—Major

Normally open

5

Common

12

Normally closed

7

unused

n.c.

8

unused

n.c.

3

Audible—Minor

Normally open

11

Common

10

Normally closed

6

Visual—Minor

Normally open

14

Common

13

Normally closed

15

unused

n.c.

Standard MGX 8220 Cables

Table A-21 lists the various cables that may be ordered directly from Cisco. Cable lengths are specified as a suffix to the model number. For example 5610-50 indicates a 50 foot cable. Cables are generally available in standard lengths of 10 ft. (3 m), 25 ft. (7.6 m), 50 ft. (15 m), 75 ft. (22.8 m), and 100 ft. (30 m). Lengths of 101 ft. (30 m) to 600 ft. (183 m) are available on a special order.

When a cable is connectorized, the connector gender (male-female) will be indicated as well as the number of pins. For example, RS-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.


Table A-21: Standard Cables Available from Cisco
Model Number Description Usage

T3-E3-10
T3-E3-25
T3-E3-50
T3-E3-75
T3-E3-xx

75

coax/BNC-BNC, 10'
25'
50'
75'
length to be specified

T3 or E3 trunk interface

5620

RS-232/M25-F25

Control port to control terminal, StrataView, or ext. window device

5621

RS-232/M25-M25 special

Control or maintenance port to modem

5601

Ground cable

DC

5670

Molex-pigtail

DC

5671

Spade lug-pigtail

DC

Redundancy "Y" Cable

The redundancy cables are a special "Y" cable available from Cisco. They are required for redundant trunk and data interfaces. Table A-22 lists the Y-cables used with various MGX 8220 back cards.


Table A-22: Redundancy Y-Cables
Y- Cable Used On P/N

E3/T3 trunk

T3E3-D
T3E3-B

T3-E3-Y