Nortel Networks Circuit Card 311 - Manual (Page 952)

952 NTAK79 2.0 Mb PRI card
timing signal. The clock controller uses either the two external/auxiliary
references or the NTAK79 references. NTAK79 has the necessary hardware
for routing its reference to the appropriate line on the backplane
Software is responsible for the distribution of the secondary references and
ensures that no contention is present on the REFCLK1 backplane line.
Software designates the NTAK79 as a primary reference source to the clock
controller. The secondary reference is obtained from another NTAK79 card,
which is designated by a craft person. No other clocks originating from
other NTAK79 circuit cards are used.
The clock controller provides an external timing interface and is capable
of accepting two signals as timing references. In this case, an external
reference refers to an auxiliary timing source which is bridged from a traffic
carrying signal. This is not intended to be a dedicated non-traffic bearing
timing signal. The clock controller uses either the two external/auxiliary
references or the NTAK79 references.
The NTAK79 has the necessary hardware for routing its reference to the
appropriate line on the backplane.
The software is responsible for the distribution of the secondary references
and ensures that no contention is present on the REFCLK1 backplane line.
The software designates the NTAK79 as the primary reference source to the
clock controller. The secondary reference is obtained from another NTAK79
card, which is designated by a technician. No other clocks originating from
other NTAK79 circuit cards are used.
The clock controller provides an external timing interface and is capable
of accepting two signals as timing references. In this case, an external
reference refers to an auxiliary timing source which is bridged from a traffic
carrying signal. This is not intended to be a dedicated non-traffic bearing
timing signal. The clock controller uses either the two external/auxiliary
references or the NTAK79 references.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
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