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CCSNIS Supporting Network Interconnection Using IP-Based Virtual High Speed Signaling Links (IPVHSLs)

Document Number GR-3029
Issue Number 02
Issue Date Dec 2001

    ABSTRACT: Issue 2 of GR-3029, CCSNIS Supporting Network Interconnection Using IP-Based Virtual High-Speed Signaling Links (IPVHSLs), presents the preliminary Telcordia view of proposed generic network interface requirements for the interconnection of client-company Common Channel Signaling (CCS) networks with Interconnecting CCS Networks (ICNs) of other carriers using Internet Protocol (IP) -Based Virtual High Speed Signaling links (IPVHSLs). Specifically these refer to IPVHSLs as defined in GR-3021.

    IPVHSLs shall use the signaling protocol stack defined by the Internet Engineering Task Force (IETF) Signaling Transport (SIGTRAN) Working Group for the Signaling System 7 (SS7) Message Transfer Part (MTP) Layer 2 Peer-to-Peer User Adaptation Layer, more commonly known as M2PA, over an IP-based data network for signaling message transport. The employed protocol stack utilizes the following protocol layers for the exchange of signaling messages between CCS network signaling points:

    • the current SS7 Message Transfer Part - Level 3 (MTP3) at the signaling network layer
    • over M2PA as an adaptation layer protocol
    • over the Stream Control Transmission Protocol (SCTP) at the transport layer
    • over the Internet Protocol (IP) at the data-network layer
    • over implementation-dependent Network Access Protocol (NAP) and physical layers

    This IP-based signaling transport architecture is proposed to be used instead of conventional signaling links, which now utilize dedicated, fixed-bandwidth interoffice transmission facilities to support the transmission paths between SS7 signaling points, both within and between the involved carriers CCS networks. As used in this document, conventional links refer to existing 56-kilobit-per-second (Kbps) links based on the MTP level 2 (MTP2) protocol and existing 1.5 megabit-per-second (Mbps) links utilizing Asynchronous Transfer Mode (ATM-based) signaling data links and the Signaling ATM Adaptation Layer (SAAL) as a link-layer protocol. The architecture is intended to facilitate the replacement of such conventional signaling links between the involved client companys CCS nodes and the ICN nodes with IPVHSLs. The use of IPVHSLs across the network interface is intended to provide for a more efficient and more flexible utilization of the underlying bandwidth in the carriers' interoffice transport facilities network and conserve CCS node equipment ports.

    This GR defines the CCS network architecture and signaling protocols that could be used by the client companies on such network interfaces to ICNs. In particular, it defines network scenarios in which IPVHSLs can be used; interface requirements for the IP, SCTP, and M2PA layers; MTP3 protocol requirements; capacity engineering considerations; and transition considerations for the signaling network interface.

    Focusing particularly on IPVHSLs, this GR provides only those incremental requirements and guidelines necessary to support such links across a CCS network interface and, as such supplements GR-905. GR-905 provides more general signaling network interconnection interface requirements. It is important to note a difference between this specification and other generic requirements documents. Most other GR documents address individual network elements and focus on the information needs of equipment suppliers who develop those elements, while this specification focuses on the needs of the interfaces between the clients networks and ICNs.

    Issue 2 of this GR incorporates clarifications, revisions, and corrections to the generic criteria published in Issue 1, as well as to reflect revised draft industry standards and revisions to related Telcordia GRs.

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