Table Of Contents

Cabling Summary

Introduction

T3 Trunk Cabling

IMATM T1/E1 Connectors

Frame Relay Cabling

T1 Cabling

E1 Cabling

X.21 Port Connectors

HSSI Port Connectors

Cabling for RJ-48 Connectors on T1 and E1 Ports

DC Power Cabling

AC Power Cabling

Control and Clock Cabling

Maintenance and Control Ports

Modem Cable

External Clock Input Cabling

External Alarm Cabling

Standard MGX 8220 Cables

Redundancy Y-Cables

Cabling Summary

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Introduction

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

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

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T3 Trunk Cabling

Trunk cables connect the T3 port on the BNM backcard to the BNI T3 port on the colocated BPX node. See 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. (See Figure 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). See 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 (one transmit and one receive).
Cable Connector	Male DB-15 subminiature.
Max. Cable Length	533 ft (162 m) max. 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

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Note Transmit direction is toward the T1 trunk.

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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). (See 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. See Tables A-2 and A-3 for pinouts.
Max. Cable Length	Approx. 100 meters max. 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

DB-15 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). (See 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 (one transmit and one receive).
Cable Connector	Male DB-15 subminiature.
Max. Cable Length	533 ft (162 m) max. 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

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Note Transmit direction is toward the E1 trunk.

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X.21 Port Connectors

The X.21 ports use DB-15 female connectors (DCE type according to ISO 4903.) (See 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). (See 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			_
9	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 using RJ-48 connectors on 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.) See Table A-11 and Table A-12 for acceptable cable and wire types.

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

Table A-11 DC Power Wiring

Cable Parameter	Description
Wiring	Three conductor, 12 AWG recommended wire gauge, min. 60ЧC insulation rating, copper conductors only. Solid or stranded wires. Wire insulation stripped back 0.25 in. (6 mm) at the MGX 8220 connector end.
Connection	Euro-block.

Figure A-3 DC Power Connections

AC Power Cabling

AC power cables can be provided by the customer or ordered from Cisco. Several standard cables are available. (See Table A-12.) AC cables with other plugs or different lengths can 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 ft (2.3 m) of 3-conductor wire with plug.
Plug: customer end	20A NEMA L620, 3-prong plug (domestic) 13A 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 is 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

1 Used 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 T3/E3-D, T3/E3-B, and SMF-155 EXT. TMG. connectors. The clock is 1.544 Mbps for T3/E3-D or 2.048 Mbps for T3/E3-D. (See Table A-15 through Table A-18.)

T1/E1 Clock Cabling

The DB-15 clock port can be used for accepting a T1 or E1 BITS clock input.

Table A-15 External Clock Cabling—T3/E3-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 (one receive).
Cable connector	Male DB-15 subminiature. Refer to Table A-16 for pinouts.
Max. cable length	533 ft (162 m) max. between the MGX 8220 shelf and the first repeater or CSU. Selection of cable length equalizers is used. Wire buildout is required.

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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, T3/E3-D, or SMF-155

Table A-17 E1 Clock Cabling—T3/E3-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 DB-15 for balanced connection.
Max. cable length	Approx. 100 meters max. 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 (see Table A-19) connects 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 can 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 feet (3 m), 25 feet (7.6 m), 50 feet (15 m), 75 feet (22.8 m) and 100 feet (30 m). Lengths of 101 feet (30 m) to 600 feet (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 DB-25 at both ends.

Table A-21 Standard Cables Available from Cisco

Model No.	Description	Usage
T3/E3-10 T3/E3-25 T3/E3-50 T3/E3-75 T3/E3-xx	75 W coax/BNC-BNC, 10 ft 25 ft 50 ft 75 ft length to be specified	T3 or E3 trunk interface
5620	RS-232/M25-F25	Control port to control terminal 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-Cables

The redundancy cables are special Y-cables available from Cisco. These cables 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	Part No.
E3/T3 trunk	T3/E3-D T3/E3-B	CAB-T3/E3-Y

Posted: Wed Nov 10 21:49:23 PST 2004
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