AT&T DS1/DMi/ISDN-PRI Trunking Considerations ISDN-PRI Applications, Advantages of CBC Trunking

7-128ADMINISTRATION OPTIONS AND REQUIREMENTS — GENERIC 1

Trunking Considerations — ISDN-PRI Applications

It is necessary to determine those types of ISDN-PRI network services desired before attempting to build the ISDN-PRI trunk groups. Some of the more significant considerations should include the following:

NOTE: An ISDN-PRI trunk group is created by translating the Group Type field as isdn-pri.

1.

2.

Will the switch provide ISDN-PRI private network access or ISDN-PRI public network access?

If private network access, you can translate the Service Type field as tie. Depending on the particular application other service types may also be applicable (such as tandem), i n particular if you want traveling class marks (TCMs).

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If public network access, then the identity of the interexchange carrier (IXC) or local exchange carrier (LEC) must be known. Furthermore, the particular carrier's ISDN network Services/Features (that are to be used) must be known and defined in software translations.

NOTE: The NETWORK-FACILITIESscreen lists (by name and facility coding definition) each of the currently available AT&T ISDN network Services/Features. These are frequently called the Predefined Services/Features. If public network access is to an LEC or to an IXC other than AT&T (or if it is not defined), then that carriers ISDN Services/Features should be defined in the lower half of the screen.

If public network access, then translate the Service Type field as required (such as cbc).

If the Service Type field is translated cbc, then (as an option):

a . From 1-to-3 USAGE ALLOCATION PLANS may be defined.

b . A time-of-day day-of-week ASSIGNMENT SCHEDULE (consisting of up to six transition times per day) may be defined for each usage allocation plan. Alternately, a usage allocation plan may be defined as fixed meaning that the selected allocation plan is always in effect.

For all Service Types, each incoming type of Service/Feature (such as MEGACOM 800 and SDN) may receive service-specific incoming call handling treatment. Included is the administration ability to request SID-ANI on a per call basis, to do digit deletion/digit insertion on a per call basis, or to effect night-service routing based on attributes of the incoming call.

NOTE: The determination of whether the switch will request SID/ANI (on a CBC basis) depends on the station called and certain administration data for that station.

Advantages of CBC Trunking

In a non-CBC Service Selection environment, specific DS1 channels must be preassigned and provisioned for each desired service. To determine the proper number of trunks per service application requires extensive traffic engineering studies. With such a study, trunk groups can be designed to accommodate a customer’s peak traffic for given service applications. Furthermore, the time when one service application encounters peak traffic may not coincide with when another service application encounters peak traffic. As an alternative, if multiple network services are