The System Administrator: An Important Note To All Users; On The Isdn Network: An Important Note On System Dependencies - AT&T 7506 User Manual

The System Administrator: An Important Note to
All Users
Throughout this manual, we ask you to speak to your ''system administrator.'' In your company,
it is the person who has been given overall responsibility for all the ISDN terminals as well as the
system. His or her title may vary from business to business. It may be ''systems manager,''
''telecommunications manager,'' ''data communications manager,'' or something unique to your
company.
We recommend you write down the name and the phone number of your system administrator.
NAME:
PHONE:
On the ISDN Network: An Important Note on
System Dependencies
Your ADM is intended for use with the AT&T 5ESS® switch, and any other switch that supports
the National ISDN-1 platform.* Both X.25 packet switched data communication and circuit
switched data communication are supported by these systems. For X.25 packet switched data,
the system supports either dialed-up data calls (X.25 virtual circuit) or a permanent connection
(X.25 permanent virtual circuit). Your ADM supports only one data call at a time, either circuit
or packet switched.
Your ADM rate adapts circuit switched data calls onto 56 or 64 kbps channels. This is true
regardless of the asynchronous data rate of the EIA-232-D interface. Therefore communication
circuit switched data directly between two ISDN networks requires digital connectivity between
the switching systems.
Your ADM will work with all National ISDN-1 switches. Your SI-1 ADM only supports one
Service Profile Identifier (SPID). Some National ISDN-1 switches require two SPIDs for voice
and circuit switched data (CSD) communications. On these switches, it is recommended you
only use X.25 D-channel packet switched data (PSD) communications until this restriction is
lifted. AT&T 5ESS supports both CSD and PSD with only one SPID.
* Bellcore has published the following requirements on National ISDN-1:
1. Bellcore SR-NWT-001953, Generic Guidelines for ISDN Terminal Equipment on Basic Access Interfaces
2. Bellcore SR-NWT-001937, National ISDN-1
Introduction 1-3