NEC NEAX2400 ICS Installation Notes
Also see for NEAX2400 ICS: Features guideProgramming manual
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NEAX2400 ICS ISDN PRI Installation NotesETI-152A Page 21. GENERAL DESCRIPTIONThis ETI describes the installation procedures and office data assignment for connecting ISDNlines to NEAX2400 ICS. The ISDN PRI (Primary Rate Interface 23B + D) allows a station user togain access to a variety of services, associated with the ISDN, based on the office data assigned.This ETI, which is not intended as a general ISDN training document, assumes the craft person isfully trained in the programming and installation of the NEAX2400 and has the necessary ISDNknowledge.2. ISDN OVERVIEW2.1 Layer 1 Physical InterfaceISDN PRI is a T1 interface which should be configured to ESF B8ZS rather than to D4AMI. Configuration to ESF B8ZS will avoid falls framing and yellow alarm emulationproblems that can occur when digital data is transported with a D4 format. If ESF with B8ZSis unavailable, the D channel speed should be set for 56Kbpps instead of 64Kbpps. Thisspeed setting also applies to data transmitted over the B channels. See Table 2 for 24PRTSwitch Settings.ISDN PRI uses out-of-band message oriented signaling, carried in a separate digital (or “D”)channel. The D channel in any PRI interface must be in time slots 24 of the DS1. Theremainder of the 23 bearer (or “B”) channels carry voice or data.When multiple DS1s for ISDN PRI are provided to a given customer location, two methodsof using D channels are used. The first method uses a D channel for each interface. Thesecond method uses one D channel for several interfaces; this is called Non-FacilityAssociated Signaling (NFAS). A D channel backup may be provided in the case of NFAS.This channel is in stand-by mode and will take over in case of primary D channel failure.Please note that there are two assignments in ATRK for any ISDN D channel. Oneassignment represents the Physical channel on the 24PRT; the second assignment representsthe D channel handler (DCH) part of the 24PRT.2.2 ISDN PRI ProtocolISDN protocol depends on the switch type used by the central office. You should have thisinformation prior to installation since switch settings and data assignment are different foreach protocol.The NEAX2400 supports AT&T 4ESS and 5ESS protocol, as well as NT DMS100/DMS250. Currently, the NEAX2400 does not support the National ISDN protocol for PRI.Arrangements should be made with the central office to configure the protocol for customand not for National ISDN PRI. The National ISDN PRI is mostly used in AT&T 5ESS andNT DMS100/250. AT&T 4ESS only supports AT&T protocol at this time.ISDN PRI protocol can be broken into two types of protocol. The first type, User to NetworkProtocol, allows connection of a PBX to a network. The second type, Symmetrical Protocol,allows PBX to PBX connection via private lines. |
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