Cabling Summary

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.

Connector	Description
Rx BNC	Receive T3 from trunk
Tx BNC	Transmit T3 to trunk

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.

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.

Pin No.	Description
1	Transmit, Tip
2	Transmit Pair Shield
3	Receive, Tip
4	Receive Pair Shield
9	Transmit, Ring
11	Receive, Ring

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.)

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.

Connector	Description
Rx BNC	Receive E1 from trunk
Tx BNC	Transmit E1 to trunk

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.)

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.

Pin No.	Description
1	Transmit, Tip
2	Transmit Pair Shield
3	Receive, Tip
4	Receive Pair Shield
9	Transmit, Ring
11	Receive, Ring

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 .)

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

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.)

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

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.)

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.

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.

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)

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.

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)

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

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.

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.

Pin No.	Description
1
2	Transmit Pair Shield
3	Receive, Tip
4	Receive Pair Shield
9
11	Receive, Ring

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

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.

Connector	Description
Rx BNC	Receive E1 from trunk

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.

Cable Parameter	Description
Interface:	Dry-contact relay closure.
Wire:	24 AWG, shielded, 6-pair.
Connector:	DB-15, Subminiature, male.

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.

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.

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

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.

Y- Cable	Used On	P/N
E3/T3 trunk	T3E3-D T3E3-B	T3-E3-Y

Table A-22: Redundancy Y-Cables

Y- Cable Used On P/N

E3/T3 trunk

T3E3-D
T3E3-B

T3-E3-Y

Table of Contents

Cabling Summary