Nortel Networks 1000 - Manual (Page 846)

846 NTAK79 2.0 Mb PRI card
The connection to the echo canceler/test port is available at the
backplane/MDF connector. The signals at this port conform to the EIA
RS-232C standard.
Clock controller interface
The clock controller circuitry on the NTAK79 is identical to that of the
NTAK20 clock controller.
Though several DTI/PRI packs can exist in one system, only one clock
controller may be activated. All other DTI/PRI clock controllers must be
switched off.
clock controller circuitry on the NTAK79 is identical to that of the NTAK20
clock controller.
Note that while several DTI/PRI packs may exist in one system, only one
clock controller may be activated (all other DTI/PRI clock controllers must
be switched off).
The clock controller circuitry on the NTAK79 is identical to that of the
NTAK20 clock controller.
Though several DTI/PRI packs can exist in one system, only one clock
controller may be activated. All other DTI/PRI clock controllers must be
switched off.
Clocking modes
The clock controller can operate in one of two modes:
•
tracking
• non-tracking (also known as free-run)
The clock controller can operate in one of two modes: tracking or
non-tracking (also known as free-run).
The clock controller can operate in one of two modes:
• tracking
•
non-tracking (also known as free-run)
For more information on clocking modes, see "180" (page 126) .
Tracking mode There are two stages to clock controller tracking:
•
tracking a reference, and
• locked onto a reference.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.