Avaya BCM50 Konfigurationsanleitung PDF herunterladen (Seite 537)

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Appendix C ISDN overview 537

Networking Configuration Guide

• Layer 1: A physical connection that supports fundamental signaling passed between the ISDN

network (your service provider) and the BCM system. When the LED on a BRI S/T Media

Bay Module configured as BRI is lit, your layer 1 is functioning.

• Layer 2: A logical connection between the central office or the far end and the BCM system.

BCM has one or two of these connections for each BRI link, and one for each PRI link.

Without Layer 2, call processing is not possible.

• Layer 3: Also a logical connection between the ISDN network (your service provider) and the

BCM system. For BRI lines, layer 3 is where call processing and service profile identifier

(SPID) information is exchanged. This controls which central office services are available to

the connection. For example, a network connection can be programmed to carry data calls.

The three layers mentioned in this section are important when you are installing, maintaining, and

troubleshooting an ISDN system. For information about troubleshooting ISDN, see the

Administration Guide (NN40020-600).

ISDN bearer capability

Bearer capability describes the transmission standard used by the BRI or PRI line so that it can

work within a larger ISDN hardware and software network.

The bearer capability for BRI and PRI is voice/speech, 3.1 kHz audio (fax), and data (unrestricted

64 kbps, restricted 64 kbps, or 56 kbps).

Services and features for ISDN BRI and PRI

As part of an ISDN digital network, your system supports enhanced capabilities and features,

including:

• faster call set up and tear down

• high quality voice transmission

• dial-up Internet and local area network (LAN) access

• video transmission

•network name display

• name and number blocking (PRI, BRI and analog)

• access to public protocols

Note: Throughout this chapter, references are made to Service profile

identifiers (SPIDs). SPIDs are a part of the BRI National ISDN standard.

SPIDs are not used in the ETSI BRI standard or on PRI.

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