Network Service Requirements; Network Access Requirements; Static Access; Dynamic Access - Avaya 6424D+M User Manual

Appendix D: Applications and Switch Administration
Page D-6
Network Service
Requirements
Network Access
Requirements
To provide switched data networking through the DEFINITY
Communications System or System 75/85, access to one of the
following switched public or private data networks is required.
Private T1 — Private facilities can be used to place switched
56/64 Kbps calls through a company's private network. These
calls are switched through a series of tandem switches
connected by private T1 facilities.
ACCUNET Switched Digital Services (SDS) — SDS offers
switched 56/64 Kbps digital transmission between any two
locations, intra- and intercompany. SDS is also connected to
Switched Digital International (SDI) Service for switched
56/64 Kbps digital transmission to international locations.
Before placing international 56 Kbps calls, verify that the data
rate of the destination data endpoint is 56 Kbps. This is
required since
64 Kbps is the dominant data rate outside the U.S.
Furthermore, international 64 Kbps calls must be established
as a clear-channel or unrestricted calls.
Software Defined Data Network (SDDN) — SDDN is an
option for AT&T's Software Defined Network (SDN)
customers wishing to incorporate switched 56/64 Kbps service
into their existing numbering and pricing plans.
Access to SDS and SDDN is via DS0 channels on a DS1 facility.
There are three types of access available:
Static Access — Static access from DEFINITY or a System
75/85 to the public network requires a separate dedicated
trunk group for each service. With static access, a particular
trunk group can only be used for data calls to the specified
service — it cannot be used for voice calls or to access other
services. The System 75/85 and DEFINITY Communications
System support a static access arrangement on both robbed-bit
and ISDN PRI facilities.
Dynamic Access — Dynamic access provides the ability to use
the same trunk group for voice and data to access
SDN/SDDN. This capability is often referred to as Alternate
Voice/Data (AVD). Dynamic access to SDN/SDDN can be
accomplished on a DS1 robbed-bit or ISDN PRI facility. Note
that dynamic access to SDS does not apply since SDS can only
carry data calls.
ISDN PRI Call by Call Service Selection — Call-By-Call
Service Selection is an enhancement to dynamic trunk access
that enables a single ISDN PRI facility to provide access to an
assortment of AT&T network services including SDS and
SDN/SDDN, regardless of whether the call is voice or data.
DEFINITY Communications System
DEFINITY High Speed Link
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