363-206-285
Transmission and Synchronization Interfaces
5-42
Issue 3
June 2001
Sending DS1 AIS on the output of the BBF2B/BBF4 circuit pack can be
provisioned by using the
set-sync
command. Depending on the quality level of
the incoming sync messages, this new parameter can be provisioned to send DS1
AIS upon receiving level 5 (default), level 4, level 3, or level 2. Refer to Table 5-3
and Table 5-4 for definitions of quality levels. AIS will be sent as long as the
received message is at the provisioned or greater in quality level number.
Examples
5
In this part, some detailed examples are given to show specifically how the
synchronization messages propagate through the DDM-2000 OC-3 network and
assist in the recovery from a fiber failure. Through these examples, one can
extend the same concept to any other network that may include different
topologies, number of sites, failure locations, and number of BITS clocks.
NOTE:
All nodes in a ring using automatic synchronization reconfiguration must
have the synchronization messaging and automatic synchronization
reconfiguration features enabled to prevent alarms.
In all of the following examples, if the sync message parameter within the
set-oc3
command has been provisioned to “S byte” for an optical interface, then
the equivalent quality level S byte message will be transmitted from that optical
interface. The following are equivalent messages:
K2: Sync Quality Unknown is the same as, S1: Sync Trace Unknown
K2: Timing Looped Back is the same as, S1: Don’t Use
K2: Internal Clock is the same as, S1: Traceable SONET minimum Clock
K2: Stratum 3 is the same as, S1: Traceable Stratum 3.
Summary of Contents for DDM-2000 OC-3
Page 4: ......
Page 14: ...xiv Issue 3 June 2001 Contents GL Glossary GL 1 ...
Page 24: ...xxiv Issue 3 June 2001 Figures ...
Page 28: ...Tables xxviii Issue 3 June 2001 A A SONET Overview A 34 SONET Transport Rates A 20 ...
Page 58: ...363 206 285 About This Document lviii Issue 3 June 2001 ...
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Page 80: ...363 206 285 System Introduction 1 20 Issue 3 June 2001 ...
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Page 436: ...363 206 285 Circuit Pack Descriptions 7 158 Issue 3 June 2001 ...
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Page 518: ...363 206 285 Administration and Provisioning 8 78 Issue 3 June 2001 ...
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Page 690: ...363 206 285 Commands and Reports 11 20 Issue 2 February 2000 ...
Page 1252: ...11 582 2000 February 2 Issue OC 3 DDM 2000 ...
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Page 1348: ...363 206 285 Acceptance IXL 001 Issue 3 June 2001 Page 2 of 2 DDM 2000 OC 3 MULTIPLEXER ...
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Page 1440: ...NTP 008 Circuit Order 363 206 285 Page 6 of 6 Issue 2 February 2000 DDM 2000 OC 3 MULTIPLEXER ...
Page 1458: ...363 206 285 Circuit Order NTP 011 Issue 2 February 2000 Page 6 of 6 DDM 2000 OC 3 MULTIPLEXER ...
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Page 1574: ...363 206 285 Circuit Order NTP 027 Issue 2 February 2000 Page 4 of 4 DDM 2000 OC 3 MULTIPLEXER ...
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Page 1652: ...363 206 285 Circuit Order NTP 038 Issue 2 February 2000 Page 6 of 6 DDM 2000 OC 3 MULTIPLEXER ...
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