Nortel-networks Circuit Card Manual de usuario Pagina 735

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Circuit Card Description and Installation
744
NTAK20 Clock Controller daughterboard
Contents
This section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 735
Physical description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 738
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 739
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.
Synchronization is accomplished with an NTAK20 clock controller
daughterboard in each MG 1000S that contains a digital trunk card.
The NTAK20 clock controller daughterboard mounts directly on the
following cards:
NTAK09 1.5Mb DTI/PRI
NTBK50 2.0 Mb PRI
NTRB21 DTI/PRI/DCH TMDI
NTBK22 MISP
NT6D70 SILC
NT6D71 UILC
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