Introduction

This section describes Excel’s V5.2 products, including the hardware and software required to run and manage V5.2 on the Converged Services Platform (CSP). This implementation supports only the Local Exchange (LE) side of V5.2.

This section has been created to help application developers correctly implement and manage V5.2 applications on the CSP. It describes the internal components of the V5.2 implementation that accommodate signaling, configuration, maintenance, startup procedures, and call processing.

The V5.2 implementation involves the E-ONE card and the ISDN Series 3 card, where the V5.2 protocol resides and functions, and where all of the signaling takes place. The C Channel information is internally routed to the ISDN Series 3 card from the E-ONE card.

V5.2 is a concentration protocol for digital Common Channel Signaling (CCS). It is called a concentration protocol because it can accommodate more subscribers than existing physical ports. The V5.2 protocol is comprised of the LE (Local Exchange) side of the protocol. The V5.2 protocol is used to establish, maintain, and release calls between an LE and an AN.

The V5.2 LE is the "network side" that resides at an End Office (EO) and provides the EO and Mobile Switching Center (MSC) functionality. This functionality includes additional CLASS features and services typically provided by an LE. The AN receives V5.2 data from the LE, then passes it to two-wire analog, ISDN, Frame Relay, Wireless, Fiber Optic, or any other Customer Premises Equipment (CPE).

V5.2 supports up to 16 E1s (2048 kbps) per interface. Residing on two of these links are primary and secondary C Channels (the equivalent of ISDN D Channels) and voice/data circuits. The C Channels are 64 kbps HDLC controllers that carry signaling information for various sub-protocols within V5.2. These sub-protocols manage call processing, startup, synchronization, maintenance, and C Channel protection. V5.2 has built-in link protection that permits calls to proceed when the primary C Channel link has failed. V5.2 supports PSTN and ISDN user ports. To maintain service when multiple V5.2 links are available and one link is lost, bearer timeslots are allocated dynamically. Even if individual calls are lost, they can be re-established on a different link when re-dialed.

• PSTN protocol, BCC protocol, Control protocol, Link protocol, Protection protocol, System Management, LAPV, and Envelope function

• Dynamic addition and removal of links (not allowed for primary and secondary C Channel links)

• The ISDN Series 3 card enables the DSP-ONE card to collect digits and play out tones.

V.52 redundancy is achieved through card-level redundancy on the ISDN Series 3 card. Refer to ISDN Redundancy to configure.

Below are the V5.2 Application Program Interface (API) messages, Address Information Blocks (AIB), and Information Control Blocks (ICB). Also listed are modified API messages used to implement V5.2 on the CSP. For detailed information on API messages, AIBs, and ICBs please refer to the API Reference.

An Internet Protocol enhanced service node that supports the deployment of voice and data services in circuit, packet, and converged networks. The Converged Services Platform (CSP) features an open and multi-functional platform design that enables developers to quickly create and deliver new revenue-generating services for both legacy and next-generation networks.

See Integrated Services Digital Network.

CCS. Network architecture using SS7 protocol for the exchange of information between telecommunications nodes and networks on an out-of-band basis.

See Common Channel Signaling.

The switch that connects end users to the network. Also known as a “Central Office."

A group of data bits in a specific format, with a flag at each end to indicate the beginning and the end of the frame.

Public Switched Telephone Network

A digital communications link - voice, data, and video at a 2.048 Mbps rate; 30B/2D or 31B/1D (ISDN); non-North American version of T1.

See Programmable Protocol Language.

Digital Signal Processor

See Address Information Block.

ICB. A standardized block that allows control data to be inserted in a standard way into API messages.

See Information Control Block.

The condition of a component at a given instant. The current "context" of a PPL object, such as Idle, Seizing, Answered. In PPL files, a State is represented by a circle.

The point in the Excel platform where a DS0 connects to a network. Also known as a "socket."