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Digital Network Synchronization Plan


Document Number GR-436
Issue Number 02
Issue Date Sep 2014
Replaces SR-NWT-002224 Issue01
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    ABSTRACT: This Generic Requirements document (GR) presents the Telcordia and participating industry representatives' view of information related
    to synchronization of telecommunications service providers' digital networks. In general, it is expected to be of use to service
    provider personnel (e.g., synchronization coordinators), synchronization product suppliers, and manufacturers of equipment that
    interfaces with synchronization products.


    This Issue 2 includes significantly more information related to the distribution of Time of Day (ToD) synchronization within networks
    and the distribution of synchronization over packet-based networks. It includes:

    • Revision of text to consistently refer to the set of equipment that provides timing to multiple traffic-carrying Network Elements
      (NEs) in a particular site (e.g., a CO) as the BITS clock
    • Deletion of information related to LORAN signals
    • Revision of Section 7.3.1 to reflect the fact that Threshold Crossing Alerts (TCAs), not alarms, are generated as part of the
      Performance Monitoring (PM) process
    • Modifications to distinguish between 64 kb/s logical channels (DS0s) and 64 kb/s physical layer signals (DS0A signals)
    • Reorganization and modification of the information in Section 2 regarding the need for synchronization in telecommunications
      networks
    • Reorganization of Sections 3 and 4 so that Section 3 focuses on the stratum hierarchy, and Section 4 discusses both intraoffice and
      interoffice timing distribution
    • Addition of text related to a Timing Signal Generator's (TSG?s) possible support of frequency reference output signals other than
      the DS1 and CC signals that have traditionally been used in North American applications
    • A complete revision of Appendix A to reflect the current holdover-related criteria applicable to the various levels of standardized
      clocks.



    When using GR-436, you may need to refer to GR-1244. You may also want to refer to GR-199, GR-253, GR-378, GR-820,
    GR-833, TA-TSV-001059, GR-1060, GR-1110, TA-TSV-001238, GR-2830, GR-2842, and GR-2861.

    Components of this product are:
    GR-436-CORE

    Table of Contents:

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