DLP-523
: Detailed Level Procedure
363-206-285
Page 9 of 30
Issue 2, February 2000
DDM-2000 OC-3 M
ULTIPLEXER
Table E – BBF2B/BBF2C TGS/BBF4 TG3 Synchronization Provisioning
Topologies
NE 1
NE 2
Application Comments
Free Running
Free Running
This topology is not supported. Both systems
are operating asynchronously from each other.
Free Running
Line Timing
This topology is allowed but results in having a
SONET subnetwork operating asynchronously
with respect to other NE’s in the network. The
NE’s deriving timing off the NE provisioned for
Free Running will be synchronized to it but not
to a PRS on the network. If automatic
synchronization reconfiguration is supported
and enabled in a system, the NE 2 system will
attempt to switch to another better quality line
timing source, if available.
Free Running
Line Timing - Sync Out
This topology, although not recommended,
results in having a SONET subnetwork
operating asynchronously with respect to
other NE’s in the network. The NE’s deriving
timing off the NE provisioned for Free Running
will be synchronized to it but not to the rest of
the network. The DS1 timing output is
normally used to synchronize other NE’s to a
PRS. In this topology the timing of the Free
Running NE is being distributed by the use of
the DS1 output timing reference in the
absence of Synchronization Messaging. In the
presence of Synchronization Messaging, the
DS1 output will carry DS1 AIS. If automatic
synchronization reconfiguration is supported
and enabled in a system, the NE 2 system will
attempt to switch to a better quality line timing
source, if available.
Free Running
External - Mult
This timing topology is not supported. The two
network elements will be operating
asynchronously from each other.
Free Running
External - Sync Out
This timing topology is not supported. The two
network elements will be operating
asynchronously from each other.
External - Mult
Line Timing
This topology is used when one of the NE’s
does not have access to an external
synchronous reference and needs to be
synchronized to an NE whose timing is
traceable to a PRS. The NE provisioned for
Line Timing will derive its timing from the NE
provisioned for External - Mult timing thus
operating synchronously with that respective
NE. The NE provisioned for External - Mult
timing could use its DS1 output to distribute its
incoming DS1 timing reference to other
shelves in the bay to conserve ports on the
BITS.
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 ...
Page 60: ...1 ii Issue 3 June 2001 Table of Contents ...
Page 80: ...363 206 285 System Introduction 1 20 Issue 3 June 2001 ...
Page 154: ...3 ii Issue 3 June 2001 Table of Contents ...
Page 184: ...4 ii Issue 3 June 2001 Table of Contents ...
Page 252: ...363 206 285 Transmission and Synchronization Interfaces 5 60 Issue 3 June 2001 ...
Page 254: ...6 ii Issue 3 June 2001 Table of Contents ...
Page 278: ...7 vi Issue 3 June 2001 Table of Contents ...
Page 436: ...363 206 285 Circuit Pack Descriptions 7 158 Issue 3 June 2001 ...
Page 440: ...8 iv Issue 3 June 2001 Table of Contents ...
Page 518: ...363 206 285 Administration and Provisioning 8 78 Issue 3 June 2001 ...
Page 588: ...10 iv Issue 3 June 2001 Table of Contents ...
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 ...
Page 1254: ...A ii Issue 3 June 2001 Table of Contents ...
Page 1276: ...363 206 285 A SONET Overview A 22 Issue 3 June 2001 ...
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