Nortel CS 1000 Series Installation And Commissioning Manual page 42

42 Installing ISDN BRI hardware
Figure 11
Clock reference cable connection
Clock recovery
The SILC is configured in the slave-slave mode when acting as a trunk
interface. This is configured through the Maintenance Signaling Channel
(MSC). The microcontroller configures the S/T chips on the SILC as
appropriate.
The SILC can recover the network clock from the received data stream
using on-chip phase lock loops. The clock frequency that is recovered is
2.56 MHz. The jitter and wander conform to CCITT recommendations.
All of the S/T chips on the SILC could be configured as Terminal
Equipment Slaves (TES), but only the clocks recovered from DSL0 and
DSL1 are routed to the back plane connector pins. These clocks are
provided as differential pairs on back plane pins. See
differential pairs" (page
Table 9
Clocks as differential pairs
Differential pairs
Primary
Primary
Secondary
Secondary
Copyright © 2003-2009 Nortel Networks
.
42).
Nortel Communication Server 1000
ISDN Basic Rate Interface Installation and Commissioning
NN43001-318 03.01
11 May 2009
Pin # Row A
73 +Ref 0A
74
+Ref 1A
75
+Ref 0B
76 +Ref 1B
Table 9 "Clocks as
Row B
- Ref 0A
- Ref 1A
- Ref 0B
- Ref 1A