
NT5D97 Dual-port DTI2/PRI2 card
Page 353 of 906
Circuit Card
Description and Installation
Architecture
Clock operation
There are two types of clock operation - tracking mode and free-run mode.
Tracking mode
In tracking mode, the DDP2 loop supplies an external clock reference to a
clock controller. Two DDP2 loops can operate in tracking mode, with one
defined as the primary reference source for clock synchronization, the other
defined as the secondary reference source. The secondary reference acts as a
back-up to the primary reference.
As shown in Figure 77, a system with dual CPUs can have two clock
controllers (CC-0 and CC-1). One clock controller acts as a back-up to the
other. The clock controllers should be completely locked to the reference
clock.
Free run (non-tracking) mode
The clock synchronization of the can operate in free-run mode if:
•
no loop is defined as the primary or secondary clock reference,
•
the primary and secondary references are disabled, or
•
the primary and secondary references are in local (near end) alarm
13
ON
OFF
ON
ON
14
OFF
ON
ON
ON
15
ON
ON
ON
ON
Table 138
Switch setting for MSDL external card (Part 2 of 2)
Switch Setting
DNUM (LD 17)
1
2
3
4
Содержание Circuit Card
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Страница 694: ...Page 694 of 906 NT8D41BA Quad Serial Data Interface Paddle Board 553 3001 211 Standard 3 00 August 2005...
Страница 720: ...Page 720 of 906 NTAK09 1 5 Mb DTI PRI card 553 3001 211 Standard 3 00 August 2005...
Страница 734: ...Page 734 of 906 NTAK10 2 0 Mb DTI card 553 3001 211 Standard 3 00 August 2005...
Страница 744: ...Page 744 of 906 NTAK20 Clock Controller daughterboard 553 3001 211 Standard 3 00 August 2005...
Страница 762: ...Page 762 of 906 NTAK79 2 0 Mb PRI card 553 3001 211 Standard 3 00 August 2005...
Страница 768: ...Page 768 of 906 NTAK93 D channel Handler Interface daughterboard 553 3001 211 Standard 3 00 August 2005...
Страница 772: ...Page 772 of 906 NTBK22 MISP card 553 3001 211 Standard 3 00 August 2005...
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Страница 884: ...Page 884 of 906 QPC841 Quad Serial Data Interface card 553 3001 211 Standard 3 00 August 2005...
Страница 906: ...Page 906 of 906 Appendix A LAPB Data Link Control protocol 553 3001 211 Standard 3 00 August 2005...
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