Avaya BCM 4.0 Networking Przewodnik Konfiguracji Pobierz pdf (Strona 128)

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128 Chapter 8 Configuring telephony resources

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Interface levels

The default Interface levels are the ISDN loss plan settings. Also refer to “ISDN overview” on

page 709.

Check with your telecommunications service provider to determine if your BCM system is

connected to a central office (CO) with digital network loss treatment (ISDN I/F levels) or analog

network loss treatment (PSTN I/F levels).

The ISDN setting requires digital access lines (DAL) that have digital network loss treatment. On

a DAL network, the PBX system administers the dB loss, not the CO. DALs may have ISDN

signaling or digital signaling (for example, T1). The loss plan follows the Draft TIA-464-C loss

plan, which uses a send loudness rating (SLR) of 8 dB. You must contact your service provider to

get DAL network loss treatment on a line with digital signaling.

The PSTN setting requires analog access lines (AAL) that have analog network loss treatment and

digital signaling. On an AAL(D) network, the CO administers the dB loss.

The loss plan follows the Draft TIA-464-C loss plan. The ISDN loss plan uses a send loudness

rating (SLR) of 8 dB and a receive loudness rating (RLR) of 2 dB. The PSTN loss plan uses an

SLR of 11 dB and an RLR of -3 dB. If you choose the wrong setting, the voice signal can be too

loud or too soft.

Internal CSU

Internal CSU allows you to turn the internal T1 channel service unit on or off. The channel service

unit gathers performance statistics for your T1 lines or PRI with public interface. Contact your

service provider for the correct settings.

You can view the performance statistics for your T1 lines in Maintenance under the CSU stats

heading. Before you set the internal CSU to off, you must ensure there is an external CSU

connected to your T1 lines.

Call-by-Call Service Selection

This section provides information about how to configure the PRI Call-by-call Service Selection,

which is region-specific to North America, for a DTM set to a PRI Module type.

By default, incoming calls on a PRI are routed based on the Called Party Number information

within the call request. The last number of digits of the called party number that match the

Received Number Length setting are used as Receive Digits to find a target line.

In North American PRI, the Call-by-Call services allows alternate routing maps to be defined in

various ways, depending on the protocol defined for this PRI.

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