Cisco Systems MGX 8220 manual T1/E1 Clock Cabling, Pin No. Description

Appendix A Cabling Summary

Control and Clock Cabling

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-16for 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.

.

Table A-16 T1 Connector Pin Assignments for EXT. TMG

Pin No. Description

1

2Transmit, pair shield

3Receive, Tip

4Receive, pair shield

11Receive, 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

	Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003		A-9