Specifications

Control and Clock Cabling
Cabling Summary A-9
Modem Cable
FigureA-4 shows a modem cable that is used for connecting modems to the MGX 8220 control and
maintenance ports.
FigureA-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.
TableA-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.