Modem Cable; External Clock Input Cabling; Figure B-3 Null Modem Cable; Table B-15 External Clock Cabling-T3E3-D Or Smf-155 - Cisco MGX 8850 Installation And Configuration Manual

Control and Clock Cabling

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

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-15 through Table B-18.
T1/E1 Clock Cabling
The DB15 clock port can accept a T1 or E1 BITS clock input.
Table B-15
Cable Parameter
Cable Type:
Cable Connector:
Max. Cable Length:
Table B-16
Pin No.
1
2
3
4
9
11
B-6 Cisco MGX 8850 Installation and Configuration, Release 1.1.10, Part Number 78-6186-03
Null Modem Cable
External Clock Cabling—T3E3-D or SMF-155
Description
Western Electric 22 AWG, ABAM individually shielded twisted pair (100 ohm
balanced). One pair per T1 line (1 receive).
Male DB-15 subminiature. Refer to Table B-16 for pinouts.
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.
T1 Connector Pin Assignments for EXT. TMG.
Description
Transmit Pair Shield
Receive, Tip
Receive Pair Shield
Receive, Ring