Nortel Networks 1000 - Manual (Page 852)

852 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 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
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