Nortel-networks Circuit Card Manual do Utilizador descarregar pdf (Página 736)

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Page 736 of 906 NTAK20 Clock Controller daughterboard

553-3001-211 Standard 3.00 August 2005

Note: The card is restricted to slots 1 through 3 in EMC- type cabinets

(such as NAK11Dx and NTAK11Fx cabinets). It will not work in slots 4

through 10 in these cabinets.

The NTAK20 clock controller card can support 1.5 Mb, 2.0 Mb, and 2.56 Mb

clock recovery rates.

Note: Clocking slips can occur between MG 1000S systems that are

clocked from different COs, if the COs are not synchronized. The slips

can degrade voice quality.

The clock controller circuitry synchronizes the system to an external

reference clock and generates and distributes the clock to the system. The

system can function either as a slave to an external clock or as a clocking

master. The NTAK20AD version of the clock controller meets the AT&T

Stratum 3 and Bell Canada Node Category D specifications. The

NTAK20BD version meets CCITT Stratum 4 specifications.

The NTAK20 card performs the following functions:

• phase lock to a reference, generation of the 10.24 Mhz system clock, and

distribution of the clock to the CPU through the backplane

• accept one primary and one secondary reference

• primary-to-secondary switchover and auto-recovery

• chatter prevention due to repeated switching

• error-burst detection and correction, holdover, and free running

capabilities

• communication with software

IMPORTANT!

Each MG 1000S that has a digital trunk must have a clock controller

clocked to an external reference clock.

If an IP Expansion multi-cabinet system is equipped with digital trunk

cards, it is mandatory that at least one trunk card is placed in the Main

cabinet.

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