Nortel Networks NN43001-318 User Manual
42
Installing ISDN BRI hardware
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.
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
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
.
Table 9
Clocks as differential pairs
Clocks as differential pairs
Differential pairs
Pin #
Row A
Row B
Primary
73
+Ref 0A
- Ref 0A
Primary
74
+Ref 1A
- Ref 1A
Secondary
75
+Ref 0B
- Ref 0B
Secondary
76
+Ref 1B
- Ref 1A
Automatic clock recovery is done upon the expiration of the free run guard
timer. Tracking is restored to the primary reference clock, if defined. If the
primary reference clock is disabled, tracking is restored to the secondary
reference clock, if defined.
timer. Tracking is restored to the primary reference clock, if defined. If the
primary reference clock is disabled, tracking is restored to the secondary
reference clock, if defined.
Installing the SILC and the UILC
Follow the same procedures as described earlier for line applications (refer
to
to
).
Connecting the system to the Main Distribution Frame (MDF)
Follow the same procedures as described earlier for line applications (refer
to
to
).
Cross-connecting the Main Distribution Frame (MDF)
The system, in TIE trunk or CO connectivity, requires a different wiring
configuration than for a line application; the transmit and receive pairs should
be reversed, as illustrated in
configuration than for a line application; the transmit and receive pairs should
be reversed, as illustrated in
.
Nortel Communication Server 1000
ISDN Basic Rate Interface Installation and Commissioning
NN43001-318
01.02
Standard
Release 5.0
20 June 2007
Copyright © 2003-2007, Nortel Networks
.