B-4 Cisco BPX 8600 Series Reference
LM-BCC Cabling
External Clock Input Cabling
This cabling is for making external clock connections for use by the BCC-32, BCC-3, and BCC-4
backcards. The BCC-32 uses the BCC-bc backcard, and the BCC-3 and BCC-4 both use the
BCC-3-bc backcard.
T1 Clock Cabling
Table B-8 through Table B-11 lists T1 clock cabling details.
Table B-8 External Clock Cabling
Table B-9 T1 Connection to XFER TMG on BCC-bc
Table B-10 T1 Connection to EXT TMG on BCC-bc
Table B-11 T1 Connection to EXT 1 or EXT 2 on BCC-3-bc
Cable Parameter Description
Cable Type: 22 AWG, ABAM individually shielded twisted pair. Two pair per T1 line (1
transmit and 1 receive).
Cable Connector: Male DB-15 subminiature. See Table B-10 through Table B-11 for pinouts.
Max. Cable Length: 533 ft (162 m.) maximum between the BPX switch and the first repeater or
CSU. Selection of cable length equalizers.
Pin # Description
1 Transfer timing ring
2 Transfer timing tip
3 & 4 Transfer timing shield
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
