Specifications

A-2 Cisco MGX 8220 Reference, Release 4.1
Frame Relay Cabling
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.)
FigureA-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.
TableA-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.