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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 the ISDN — including all 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 more
unique to your company.
We recommend you write down the name and the phone number of your system administrator.
NAME:
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PHONE:
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On the ISDN Network: An Important Note on
System Dependencies
Your ADM is intended for use with the AT&T 5ESS switch. This system supports both X.25
packet switched data communication and circuit switched data communication. 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). For circuit switched data, the system
supports only dialed-up data calls. 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.
Introduction 1-3
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