SONET Unidirectional Path Switched Ring (UPSR) Equipment Generic Criteria
Document Number GR-1400
Issue Number 03
Issue Date Jul 2006
Replaces TA-NWT-001400 Issue01
ABSTRACT: Issue 3 of GR-1400, SONET Unidirectional Path-Switched Ring (UPSR) Equipment Generic Criteria, replaces Issue 2.
GR-1400 contains the Telcordia view of generic criteria for Network Elements that are specified to be capable of being deployed as
nodes in Unidirectional Path-Switched Rings (i.e., UPSR NEs). UPSR NEs utilize one of the Automatic Protection Switching (APS) schemes
that have been defined to improve the survivability of transport systems by allowing them to switch to standby equipment or facilities
to process or carry network traffic when degradations affecting the active equipment or facilities occur.
Issue 3 contains the following additions and changes:
- A significant reorganization has been done, and the scope of the document has been expanded to include other NEs [in addition
to SONET Add-Drop Multiplexers (ADMs)] that may be deployed as nodes in a UPSR [e.g., SONET Digital Cross-Connect Systems (DCSs)]
- Various requirements have been updated to align with the latest issue of GR-253-CORE, Synchronous Optical Network (SONET)
Transport Systems: Common Generic Criteria
- New sections have been added to address new developments in the technology
- Various existing criteria (and in most cases, explanatory text) have been revised and new criteria added on the path selection
process, provisioning, switch initiation times, switch completion times, and other issues
- New or modified explanatory text has been provided on a number of topics, including the functional architecture of a UPSR, the
various applications in which a UPSR NE might be deployed, and the operations communications routing and interworking functions that a
UPSR NE may need to support.
GR-1400 replaced TA-NWT-001400 and TR-TSY-000496.
When using GR-1400, you may want to refer to GR-253, GR-378, GR-418, GR-496, GR-499, GR-820, GR-1230,
GR-2996, and TR-TSY-000824. In addition, you may also want to refer to ITU-T Rec. G.841.
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