ABSTRACT: This document proposes the Generic Requirements for local switching systems that offer public network ISDN capabilities over a Primary
Rate interface to CLASS II equipment. The scope of the document is to call establishment and clearing procedures for signaling over a
Primary Rate Interface to CLASS II equipment and interworking with existing networks. Supplementary services over a Primary Rate
Interface are beyond the scope of this document. In addition, four appendices are included covering the following material:
Covers Symmetric Call Operation for public switching systems providing private network services;
Covers the D-channel Back-Up procedures to allow a public switch to have a standby D-channel to allow greater reliability when using
non-facility-associated signaling (for more than 2 DS1 facilities);
Covers the Data Dictionary for memory update commands;
Covers the Group-Specific Traffic application for Primary Rate to allow CLASS II equipment increased public and private traffic
TR-NWT-001268 replaced TA-NWT-001268 and SR-NWT-002108.
TR-NWT-001268 is erroneously referred to as "TR-NWT-001286" in GR-505. Issue 1 contains Revisions 1 through 4.