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In this example, there are multiple T1 circuits and a BRI circuit. Since the T1 assigned as EXTERNAL
has higher priority than a BRI, the T1 EXTERNAL is the PLO synchronization source.
In this example, there is a PRI, multiple T1s, and a BRI. The PRI was the PLO synchronization source
until it went down. The BRI then becomes the PLO synchronization source because when a PRI is in
the system, T1s cannot be assigned as EXTERNAL, which are not in the PLO Synchronization Source
priority list.
If multiple BRIs exist and no PRI or T-1 EXTERNAL exists, the system chooses the first BRI that
synchronized with the carrier. In this example, the BRI in slot02 synchronized with the carrier first and
became the PLO synchronization source.
In this scenario, the PRI was the clocking source until it went down. There are no other PRIs, T1
(Externals), or BRIs in the system. The CPU now becomes the PLO synchronization source.
Guide to Feature Programming
Refer to the related features for programming.
Operation
Refer to the related features for details.
Main KSU
Exp. KSU
T1/E1
BRI
T1/E1
Figure 1-11 Digital Trunk Clocking Example 5
Main KSU
Exp. KSU
Exp. KSU
T1/E1
T1/E1
BRI
PRI
Figure 1-12 Digital Trunk Clocking Example 6
Main KSU
Exp. KSU
BRI
BRI
Figure 1-13 Digital Trunk Clocking Example 7
Main KSU
PRI
CPU
Figure 1-14 Digital Trunk Clocking Example 8
ISSUE 1.0
SL1000
D
Features and Specifications Manual
1-165
Summary of Contents for SL1000
Page 1: ...Features and Specifications Manual A50 031169 001 ISSUE 1 0 January 2011 ...
Page 41: ...Operation None ISSUE 1 0 SL1000 A Features and Specifications Manual 1 33 ...
Page 57: ...Operation None ISSUE 1 0 SL1000 B Features and Specifications Manual 1 49 ...
Page 95: ...Operation None ISSUE 1 0 SL1000 C Features and Specifications Manual 1 87 ...
Page 154: ...Operation None ISSUE 1 0 SL1000 D Data Line Security 1 146 ...
Page 324: ...Operation LCR Operation Flow Diagram ISSUE 1 0 SL1000 L LCR Least Cost Routing 1 316 ...
Page 325: ...LCR Dial LCR Dial Editing ISSUE 1 0 SL1000 L Features and Specifications Manual 1 317 ...
Page 326: ...LCR Cost Centre Code ISSUE 1 0 SL1000 L LCR Least Cost Routing 1 318 ...
Page 586: ...Memo ISSUE 1 0 SL1000 Features Availability by Software Revision 3 6 ...
Page 587: ...Memo ISSUE 1 0 SL1000 Features and Specifications Manual 3 7 ...
Page 588: ...Features and Specifications Manual NEC Corporation ISSUE 1 0 ...