Specifications

Frame Relay Cabling
Cabling Summary A-3
TableA-4 T1 Connector Pin Assignments
NoteTransmit 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.)
TableA-5 E1 Trunk/Circuit Line Cabling Specification
TableA-6 E1 Connector Pin Assignments (unbalanced)
Pin No. Description
1 Transmit, Tip
2 Transmit Pair Shield
3 Receive, Tip
4 Receive Pair Shield
9 Transmit, Ring
11 Receive, Ring
Cable Parameter Description
Cable Type: BNC-4E1 75-ohm coax cable for unbalanced connection. Two cables/pairs (1 transmit,
1receive) 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