LM-BCC Cabling
BPX Switch Cabling Summary B-5
E1 Clock Cabling
Table B-12 through Table B-15 lists E1 clock cabling details.
Table B-12 E1 Connector Pin Assignments for External Clock
Table B-13 E1 Connection 75 Ohm to EXT TMG on BCC-bc or BCC-3-bc
Table B-14 E1 Connection 100/120 Ohm to EXT TMG on BCC-bc
Table B-15 E1 Connection 100/120 Ohm to EXT 1 or EXT 2 on BCC-3-bc
Connector Description
Cable Type: 75-ohm coax cable for unbalanced connection or 100–120-ohm twisted pair
for balanced connection. Two cables/pairs (1 transmit, 1 receive) per E1 line.
Cable Connector: Two female BNC for unbalanced connection; male DB15 for balanced
connection. See Table B-13 and Table B-15 for pinouts.
Max. Cable Length: Approx. 100 meters maximum between the BPX switch and the first repeater
or CSU. Equalizer for cable length.
Connector Description
BNC Receive E1 from trunk
Pin # Description
2 Receive pair shield
3 Receive tip
11 Receive Ring
Pin # Description Function
1 Transmit tip Transmit T1 timing signal synchronized to the node
2 Transmit pair shield
3 Receive tip Receive clock for synchronized clock source for node
4 Receive pair shield
7 Transfer timing tip
8 Transfer timing shield
9 Transmit ring
11 Receive ring
15 Transfer timing ring
