Nortel Networks Circuit Card 311 User Manual

Page 878

878

NTAK09 1.5 Mb DTI/PRI card

ATTENTION

IMPORTANT!

Each Media Gateway that has a digital trunk must have a clock controller clocked
to an external reference clock.

Note: Clocking slips can occur between systems that are clocked from
different Central Offices (COs), if the COs are not synchronized. The
slips can degrade voice quality.

The purpose of the clock controller interface is to provide the recovered
clock from the external digital facility to the clock controller daughterboard
via the backplane. Depending on the equipped state of the clock controller,
the clock controller interface enables or disables the appropriate reference
clock source, in conjunction with software.

The clock controller interface provides the recovered clock from the external
digital facility to the clock controller daughterboard through the backplane.
Depending on the equipped state of the clock controller, the clock controller
interface enables or disables the appropriate reference clock source, in
conjunction with software.

ATTENTION

IMPORTANT!

Each Media Gateway that has a digital trunk must have a clock controller clocked
to an external reference clock.

Note: Clocking slips can occur between systems that are clocked from
different COs, if the COs are not synchronized. The slips can degrade
voice quality.

Clock rate converter

The 1.5 Mb clock is generated by a Phase-Locked Loop (PLL). The PLL
synchronizes the 1.5 Mb DS1 clock to the 2.56 Mb system clock through the
common multiple of 8 kHz by using the main frame synchronization signal.

The 1.5 Mb clock is generated by a phase-locked loop (PLL). The PLL
synchronizes the 1.5 Mb DS1 clock to the 2.56 Mb system clock through the
common multiple of 8 kHz by using the main frame synchronization signal.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008