Cisco Systems 8600 Series manual External Clock Input Cabling, T1 Clock Cabling, LM-BCC Cabling

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-8through Table B-11lists T1 clock cabling details.

Table B-8	External Clock Cabling
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-10through Table B-11for pinouts.
Max. Cable Length:		533 ft (162 m.) maximum between the BPX switch and the first repeater or
		CSU. Selection of cable length equalizers.

Table B-9 T1 Connection to XFER TMG on BCC-bc

Pin # Description

1Transfer timing ring

2Transfer timing tip

3& 4 Transfer timing shield

Table B-10 T1 Connection to EXT TMG on BCC-bc

Pin # Description

2Receive pair shield

3Receive tip

11	Receive Ring
Table B-11	T1 Connection to EXT 1 or EXT 2 on BCC-3-bc
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

B-4Cisco BPX 8600 Series Reference