Generic Requirement Projects and Consulting Solutions
Telcordia generic requirements GR-303, GR-909, GR-57, and GR-8 have been the foundation of many successful access system products over the last decade. In 2003 Telcordia completed the development of two new generic requirements (GR) documents addressing the use of Packet Voice technology in the Local Exchange Carrier (LEC) access network (GR-3109 and GR-3110).This family of Telcordia generic requirements continues to play a vital role in the current generation of access system designs, including those access systems utilizing packet voice transport.
GR-303 and GR-8 IDLC: Integrated Digital Loop Carrier (IDLC) generic requirements are specific in GR-303-CORE and GR-8-CORE. GR-8-CORE is the original IDLC generic interface to a class 5 switching system, with limited traffic carrying capacity, telephony service mix, and limited embedded operations support (primarily limited to circuit testing and DS1 maintenance). GR-303-CORE was developed as the replacement IDLC system, offering greater traffic capacity per system, flexible traffic concentration ratio, and a robust embedded operations support capability. While GR-303 technology was designed as the next-generation IDLC system, there still remains a large embedded based of GR-8 based IDLC systems in operation in incumbent LEC networks.
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GR-57 UDLC: Universal Digital Loop Carrier (UDLC) systems are described in GR-57-CORE. UDLC systems differ from IDLC systems in that UDLC systems present individual, derived, tip-ring voice appearances in the LEC Central Office. GR-57-CORE not only provides UDLC system criteria, but also provides detailed specification of the voice frequency transmission and signaling at both the network and customer facing ends of the system for various telephony services. GR-57-CORE was updated in 2001 to address advances in technology (e.g., limited support for balanced ringing, revised longitudinal balance criteria), and to provide improved support for emerging POTS service features (e.g., criteria related to CPE-invoked momentary extension checks).
GR-909 FITL: Fiber in the Loop (FITL) systems are described in GR-909-CORE. These systems physical distribute the functionality of a narrowband IDLC or UDLC RDT, placing a portion of this functionality at or very near the customer premises. In addition to providing high-level optical and end-to-end performance requirements on the FITL system, GR-909 specifies modifications to the GR-57-CORE VF transmission and signaling requirements for short loop applications. Voice frequency Class 5 switch interface options include UDLC and IDLC. Extensions of GR-909-CORE, Issue 1 to better reflect advances in optoelectronic technology, Passive Optical Networks (PONs), and packet transport technology are being proposed in the form of a GR-909-CORE, Issue 2.
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GR-3109 PV-IDLC: Packet Voice IDLC system requirements are specified in Telcordia GR-3109-CORE (and its companion operations document, GR-3110-CORE). GR-3109 addressing the use of Packet Voice technology in the Local Exchange Carrier (LEC) access network, with specific focus on interworking with Class 5 switching systems over IDLC interfaces (both GR-303 and GR-8).
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