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Table of Contents

Cabling Summary

Cabling Summary

Introduction

This appendix contains details on the MGX 8850 cabling.

Note In all cable references, the transmit direction is away from the switch, and the receive direction is towards 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. Refer to 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 8850 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.

T1 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. Refer to 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 8850 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 towards the T1 trunk.

E1 Cabling

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). Refer to 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. Refer to Tables A-2 and A-3 for pinouts.

Max. Cable Length:

Approximately 100 meters maximum between the MGX 8850 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). Refer to 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 8850 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 towards the E1 trunk.

V.35

The back card for the MGX-FRSM-HS1/B is the 12IN1-S4. Each port on the back card connects through the DTE version or DCE version of the Cisco 12IN1 cable. The part number for a DTE 12IN1 cable is 72-1428-01 (or later). The part number for a DCE 12IN1 cable is 72-1429-01. For the pinouts in DTE mode, see Table B-9. For the pinouts in DCE mode, see Table B-10.


Table B-9: V.35 DTE Port Pin Assignments

Pin # Name Source Direction Description

7/14

SG

Both

---

Signal Ground

9/22

RxC

DCE

Input

Receive Clock

5/18

TxC

DCE

Input

Transmit Clock

3/16

RxD

DCE

Input

Receive Data

2/15

TxD

DTE

Output

Transmit Data

6/19

XTC

DTE

Output

External Transmit Clock

4/17

DTR

DTE

Output

Data Terminal Ready

10/23

DSR

DCE

Input

Data Set Ready

11

RTS

DTE

Output

Request To Send

24

CTS

DCE

Input

Clear To Send

12

LLB

DTE

Output

Local Loopback Command

13

RLB

DTE

Output

Remote Loopback

26

TM

DTE

Output

Test Mode

20

SG

Both

---

Signal Ground

25

DCD

DCE

Input

Data Carrier Detect

1

---

DCE

Input

Port in DCE Mode
Table B-10: V.35 DCE Port Pin Assignments

Pin # Name Source Direction Description

7/14

SG

Both

---

Signal Ground

8/21

RxC

DCE

Output

Receive Clock

6/19

TxC

DCE

Output

Transmit Clock

3/16

TxD

DTE

Input

Transmit Data

2/15

RxD

DCE

Output

Receive Data

9/22

XTC

DTE

Input

External Transmit Clock

4/17

DSR

DCE

Output

Data Set Ready

10/23

DTR

DTE

Input

Data Terminal Ready

11

CTS

DCE

Output

Clear To Send

24

RTS

DTE

Input

Request To Send

25

LLB

DTE

Input

Local Loopback Command

26

RLB

DTE

Input

Remote Loopback

13

TM

DTE

Output

Test Mode

20

SG

Both

---

Signal Ground

12

DCD

DCE

Output

Data Carrier Detect

1

---

DTE

Input

Port in DTE Mode

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. Refer to Table B-11 for the pinouts.


Table B-11: 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 8850 node. (See Figure B-2.) Refer to Table B-12 and Table B-13 for acceptable cable and wire types. Cisco normally does not provide wiring for DC-powered systems. Refer to Table B-12 for details on DC wiring.


Table B-12: 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 8850 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-13 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-13: 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 U.S.)
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

This section describes the cables that can connect to the PXM-UI 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. Refer to Table B-14 for a description of the cabling and Table B-15 for the pinout of the associated RJ-48 connector.


Table B-14: 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-15 contains a list of the port pin assignments.

Max. Cable Length:

50 feet (15 m)
Table B-15: 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 8850 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. Refer to Table B-16 through Table B-19.

T1/E1 Clock Cabling

The DB15 clock port can accept a T1 or E1 BITS clock input.


Table B-16: 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 B-17 for pinouts.

Max. Cable Length:

533 ft. (162 m) maximum between the MGX 8850 node and the first repeater or CSU. Selection of cable length equalizers is used. Wire build-out is required.
Table B-17: 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


Table B-18: E1 Clock Cabling---T3E3-B
Cable Parameter Description

Cable Type

75-ohm coax cable for unbalanced connection. One cable pair per E1 clock input.

Cable Connector:

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

Max. Cable Length:

Approximately 100 meters maximum between the MGX 8850 node and the first repeater or CSU. Equalizer for cable length.
Table B-19: E1 Connector Pin Assignments for EXT.TMG (unbalanced)
Connector Description

Rx BNC

Receive E1 from trunk

External Alarm Cabling

The external alarm cable connects to the Alarm connector on the PXM-UI card. See Table B-20 for physical characteristics of the cable and Table B-21 for the pinouts.


Table B-20: External Alarm Cabling
Cable Parameter Description

Interface:

Dry-contact relay closure.

Wire:

24 AWG, shielded, 6-pair.

Connector:

DB-15, Subminiature, male.
Table B-21: 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 8850 Cables

For a list of the standard cables that Cisco can supply for the MGX 8850 switch, see Table B-22. 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-22 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-22: 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

EIA/TIA-232/M25-F25

PXM-UI maintenance port to control terminal, 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-23 lists the Y-cables used with various MGX 8850 cards.


Table B-23: Y-Cable Product Names for Applicable Cards
Applicable Card Name Connector Hardware Type/Standard Interface Product Number

PXM-UI

RJ45

EIA/TIA-232

CAB-5684-06 (6-inch Y)

PXM-UI

RJ45

EIA/TIA-232

CAB-5684-18

PXM-UI

RJ45

T1 BITS Clock

CAB-5686-06 (6-inch Y)

PXM-UI

SMB

E1 BITS Clock

CAB-5681-06 (6-inch Y)

PXM-UI

SMB

E1 BITS Clock

CAB-5681-18 (18-inch Y)

PXM-UI

DB15

Alarm Output

CAB-5607-10 (10-inch Y)

PXM-4-155

SC

SMF, MMF

CAB-SMF-Y-SC

PXM-1-622

SC

SMF

CAB-SMF-Y-SC

PXM-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: Wed Jul 21 17:03:05 PDT 1999
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