Chapter 36: Ntdw12Aae5 Universal Clock Controller Daughter Board - Avaya Nortel Communication Server 1000 Reference

Chapter 36: NTDW12AAE5 Universal Clock
Contents
This section contains information on the following topics:
• Introduction
• Physical description
• Functional description
Introduction
Digital trunking requires synchronized clocking so that a shift in one clock source results in an
equivalent shift in all parts of the network. In a CS 1000 system synchronization is
accomplished with a clock controller daughterboard in each Media Gateway that contains a
digital trunk card.
The NTDW12AAE5 Universal clock controller card supports 1.5 Mb and 2.0 Mb clock recovery
rates.
The NTDW12AAE5 Universal clock controller daughterboard mounts directly on the
NTDW79AAE5 Universal Digital Trunk card. For more information about mounting the
Universal clock controller daughterboard on the Universal Digital Trunk card, see New in this
Release (NN43001-115).
Important:
Each Media Gateway that has a digital trunk must have a clock controller clocked to an
external reference clock.
Note:
NTDW12AAE5 Universal Clock Controller daughter board can be mounted only on the
NTDW79AAE5 UDT E1/T1 card. It cannot be mounted on any other Nortel digital trunk card,
e.g. NTBK50, NTAK09.
Circuit Card Reference
Controller daughter board
on page 585
on page 588
on page 588
July 2011 585