Clock rate converter – Nortel Networks 1000 User Manual

Page 776

776

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

02.06

Standard

27 August 2008