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Table of Contents

Cabling Summary

Cabling Summary

Introduction

This appendix contains details on the MGX 8250 cabling.


Note   In all cable references, the transmit direction is away from the switch, and the receive direction is toward the switch.

T3 Trunk Cabling

A trunk cable connects each T3 port on the BNC-2T3 back card to a T3 port on the co-located BPX-8600-series node. See Table B-1 and Table B-2 for details.


Table B-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 8600-series node and the MGX 8250 node.

Connector:

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


Table B-2: T3 Connector Pin Assignments
Connector Description

Rx BNC

Receive T3 from trunk

Tx BNC

Transmit T3 to trunk

Frame Relay Cabling

This section describes the cabling and connector pinouts for the Frame Relay cards.

1 Cabling

Trunk cables connect the customer DSX-1 cross-connect point or T1 Channel Service Unit (CSU) to the node at the T1 back card.See Table B-3 and Table B-4 for details.


Table B-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 8250 node and the first repeater or CSU. Selection of cable length equalizers.


Table B-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 toward the T1 trunk.

E1 Cabling

E1 cables are equipped with either BNC connectors or DB15 connectors.

BNC Connector

E1 trunk cables connect the customer DSX-1 cross-connect point or E1 Channel Service Unit (CSU) to the node at the FRSM E1 back card (BNC-8E1). See Table B-5 and Table B-6.


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

Cable Type: BNC-8E1

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. See Tables A-2 and A-3 for pinouts.

Max. Cable Length

Approximately 100 meters maximum between the MGX 8250 node and the first repeater or CSU. Equalizer for cable length.


Table B-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 cross-connect point or E1 CSU to the node at the FRSM E1 back card (DB15-8E1). See Table B-7 and Table B-8.


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

Cable Type: DB15-8E1'

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 8250 node and the first repeater or CSU. Selection of cable length equalizers.


Table B-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 toward the E1 trunk.

12IN1-S4 V.35/X.21 Back Card

The back card for the MGX-FRSM-HS1/B is the 12IN1-S4. Each port on the back card connects through a DTE version or DCE version of the Cisco 12IN1 cable. For the signals on the back card, see Table B-10 and Table B-11. The tables show the signal acronym, signal name, and signal source. The signal depends whether the back card connector is either DTE or DCE and whether the back card has been set as either X.21 or V.35 as listed in Table B-9. For the part numbers of the standard and nonstandard versions of the 12IN1 cables, see Table B-12.


Table B-9: 12IN1-S4 Cable Types
Cable Type X.21 V.35

DCE

X.21 DCE

V.35 DCE

DTE

X.21 DTE

V.35 DTE


Note   The cable type and part number are printed on a plastic band located near the smaller connector.


Table B-10: V.35 Signals
Signal Name Source

RTS

Request to Send

DTE

DTR

Data Terminal Ready

DTE

CTS

Clear To Send

DCE

DSR

Data Set Ready

DCE

DCD

Data Carrier Detect

DCE

GND

Ground

both

B_LL

Local Loopback

DTE

GND

Ground

both

TxD+

Transmit Data

DTE

TxD-

Transmit Data

DTE

RxD+

Receive Data

DCE

RxD-

Receive Data

DCE

TXCE

Secondary Clear to Send

DTE

TXCE

Secondary Clear to Send

DTE

RxC+

Receive Clock

DCE

RxC-

Receive Clock

DCE

TxC+

Transmit Clock

DCE

TxC-

Transmit Clock

DCE


Table B-11: X.21 Signals
Signal Name

Mode_2

Local connections

Mode_DCE

Local connections

Ground

Shield Ground

O_TXD/RSC+

Transmit +

OTXD/RXD-

Transmit -

O_RTS/CTS+

Control +

O_RTS/CTS-

Control -

I_RDX/TXD+

Receive +

I_RXD/TXD-

Receive -

ICTS/RTS+

Indication +

I_CTS/RTS-

Indication -

I_RXC/TXCE+

Timing +

I_RXC/TXCE-

Timing -

GND

CCT Ground


Table B-12: Cable Part Numbers for MGX-FRSM-HS1/BV
Type of Cable Far End Connector Part Number

X.21 DTE

male

72-1440-01

X.21 DCE

female

72-1427-01

V.35 DTE

male (standard)

72-1428-01

V.35 DTE

female (atypical)

72-1436-01

V.35 DCE

female (standard)

72-1429-01

V.35 DCE

male (atypical)

72-1437-01

V.35 DTE-DCE

72-1441-01

Straight-through

72-1478-01

Loopback plug

72-1479-01

HSSI Port Connectors

The High Speed Serial Interface (HSSI) port connects through a female SCSI-II connector. This connector accords with ANSI/TIA/EIA-613. See Table B-13 for the pinouts.


Table B-13: 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 T1 and E1 ports that connect through a RJ-48 connector, each connector has

An illustration of the connector wiring appears in Figure B-1.


Figure B-1: RJ-48 Connectors


DC Power Cabling

DC Power connections are made to the DC Power Entry Modules at the rear of the MGX 8250 node. (See Figure B-2.) See Table B-14 and Table B-15 for acceptable cable and wire types. Cisco normally does not provide wiring for DC-powered systems. See Table B-14 for details on DC wiring.


Table B-14: 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 in (6 mm) at the MGX 8250 connector end.

Connection:

EURO Block.


Figure B-2:
DC Power Connections


AC Power Cabling

Either Cisco Systems or the customer can provide the AC power cord. See Table B-15 for the power cords that Cisco can supply. In addition, you can special-order AC cables with other plugs or different lengths. If you want to construct the power cord, it must mate with an IEC320 16/20A male receptacle on the back of the AC power module.


Table B-15: AC Power Cables
Cable Parameter Description

Cable

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

Plug: customer end

20A NEMA L620, 3-prong plug (U.S.)
13A 250 VAC BS1363, 3-prong fused plug (U.K., Ireland)
CEE 7/7 (Continental Europe)
AS3112 (Australia, New Zealand)
CEI23-16/VII (Italy)

Control and Clock Cabling

This section describes the cables that connect to the PXM-UI-S3 card.

Maintenance and Control Ports

The maintenance (or modem) port and the control (or console) port connect a node to an ASCII terminal, workstation, or modem for remote alarm reporting or system monitoring. See Table B-16 for a description of the cabling and Table B-17 for the pinout of the associated RJ-48 connector.


Table B-16: Maintenance and Control Port Cabling
Cable Parameter Description

Interface

EIA/TIA-232—both are DTE ports.

Suggested Cable

24 AWG, 25-wire. A straight-through EIA/TIA-232 cable provides a terminal or printer connection. For an interface with modems on either port, a null modem cable may be necessary.

Cable Connector

RJ-48, subminiature, male. Table B-17 contains a list of the port pin assignments.

Max. Cable Length

50 feet (15 m)


Table B-17: Maintenance and Control Port Pin Assignments
Pin No. Name Description

1

RTS out

Request to Send

2

DTR out

Data Terminal Ready

3

TxD

Transmit Data

4

GND

Chassis ground

5

GND

Chassis ground

6

RxD

Receive Data

7

DSR

Data Set Ready

8

CTS

Clear to Send

Modem Cable

Figure B-3 shows a modem cable that is used for connecting modems to the MGX 8250 control and maintenance ports.


Figure B-3: 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.

External Clock Input Cabling

The MGX 8250 has two external clock input connectors:

    1. T1 RJ-48 connector

    2. E1 SMB connector.

T1 Clock Cabling

The clock port can accept a T1 or E1 BITS clock input. (See Table B-18)


Table B-18: 7T1 Clock Cabling
Pin No. Name

1

Tx ring out

2

Tx tip out

3

Ground

4

Rx ring in

5

Rx tip in

6

No comment

7

Test point ring out

8

Test point tip out

External Alarm Cabling

The external alarm cable connects to the Alarm connector on the PXM1-UI card. See Table B-19 for physical characteristics of the cable and Table B-20 for the pinouts.


Table B-19: External Alarm Cabling
Cable Parameter Description

Interface

Dry-contact relay closure.

Wire

24 AWG, shielded, 6-pair.

Connector

DB-15, subminiature, male.


Table B-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 8250 Cables

For a list of the standard cables that Cisco can supply for the MGX 8250 switch, see Table B-21. The suffix to the model number indicates the length of the cable. For example, 5610-50 indicates a 50-foot cable. Cables are 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 100 ft. (30 m) to 600 ft. (183 m) are available through a special order.

Where applicable, Table B-21 includes the gender of the connector and the number of pins. For example, EIA/TIA-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.


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

T3 or E3 trunk interface

5620

EIA/TIA-232/M25-F25

PXM1-UI maintenance port to control terminal, Cisco WAN Manager, or external window device

5621

EIA/TIA-232/M25-M25 special

Control or maintenance port to modem

5601

Ground cable

DC power

5670

Molex-pigtail

DC power

5671

Spade lug-pigtail

DC power

Redundancy Y-Cable

Special Y-cables provide line redundancy where applicable. (The Service Resource Module can also provide redundancy where certain Y-cables do not apply.) Table B-22 lists the Y-cables used with various MGX 8250 cards.


Table B-22: Y-Cable Product Names for Applicable Cards
Applicable Card Name Connector Hardware Type/Standard Interface Product Number

PXM1-UI

RJ-45

EIA/TIA-232

CAB-5684-06 (6-inch Y)

PXM1-UI

RJ-45

EIA/TIA-232

CAB-5684-18

PXM1-UI

RJ-45

T1 BITS Clock

CAB-5686-06 (6-inch Y)

PXM1-UI

SMB

E1 BITS Clock

CAB-5681-06 (6-inch Y)

PXM1-UI

SMB

E1 BITS Clock

CAB-5681-18 (18-inch Y)

PXM1-UI

DB15

Alarm Output

CAB-5607-10 (10-inch Y)

PXM1-4-155

SC

SMF, MMF

CAB-SMF-Y-SC

PXM1-1-622

SC

SMF

CAB-SMF-Y-SC

PXM1-2T3E3

BNC

75 ohm, coaxial

CAB-T3E3-Y

MGX-BNC-3T3-M

BNC

75 ohm, coaxial

CAB-T3E3-Y

MGX-FRSM-2T3E3

BNC

75 ohm, coaxial

CAB-T3E3-Y

MGX-CESM-T3E3

BNC

75 ohm, coaxial

CAB-T3E3-Y

MGX-FRSM-HS2

SCSI2

CAB-SCSI2-Y

SMSCFC010250-01M

SC to FC

72-1246-01


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Posted: Sat Sep 7 06:48:03 PDT 2002
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