Ntak20 Clock Controller (Cc) Daughterboard; Shelf Slot Assignment; Clocking Modes - Nortel Meridian 1 Option 11C Manual

NTAK20 Clock Controller (CC) daughterboard

Digital Trunking requires synchronized clocking so that a shift in one clock
source will result in an equivalent shift of the same size and direction in all
parts of the network. On Option 11C systems, synchronization is
accomplished with the NTAK20 clock controller circuit card in each Main
and IP Expansion cabinet.
Every cabinet that contains a digital trunk must contain a clock
controller. If a system is equipped with digital trunks, it is
recommended that at least one digital trunk be placed in the main
cabinet. If there is a mixture of TMDI and non-TMDI in the same
cabinet, place the clock controller on the non-TMDI card.
The Clock Controller circuitry synchronizes the Option 11C to an external
reference clock, and generates and distributes the clock to the system. Option
11C can function either as a slave to an external clock or as a clocking master.
The NTAK20AA version of the clock controller meets AT&T Stratum 3 and
Bell Canada Node Category D specifications. The NTAK20BA version
meets CCITT stratum 4 specifications.

Shelf slot assignment

On non-CISPR B system cabinets, the NTAK20 may be placed in slots 1-9 of
the Main cabinet. On cabinets NTAK11Dx and NTAK11Fx, the active
NTAK20 must be placed in slots 1-3 (slots 4-10 may not be used.)
On non-CISPR B IP Expansion cabinets, the NTAK20 may be placed in slots
11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion
cabinets, respectively.

Clocking modes

The Option 11C system supports a single clock controller that can operate in
one of two modes: tracking or non-tracking (also known as free-run).
PRI Implementation
IMPORTANT
Option 11C
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