Avaya 6211 Mode D'Emploi

The integrated services digital network (ISDN) basic rate interface (BRI) provides ISDN service between

voice and data terminals and the switch.

The TN556 is the new BRI port pack; it provides 12 ISDN ports and is housed in the common port 
carrier (CPC) of DEFINITY® Generic 2 Communications System (hereafter abbreviated to  DEFINITY

Generic 2 or Generic 2) with universal modules. The TN556 is not compatible with System 85 or
DEFINITY Generic 2 with traditional modules.

Generic 2 with universal modules introduces the new 7500 series of voice terminals for BRI applications

and the 7500 Universal Data Module (UDM) for data only applications:

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The 7505 is an ISDN-BRI digital voice terminal (VOM-T) with an optional asynchronous data

module (ADM-T) for simultaneous voice and data operations. When used, the optional ADM-T is
part of the 7505 basic modular telephone (BMT) voice terminal base. The 7505 also contains a

loudspeaker and speakerphone.

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Model 7506 is functionally identical to the 7505 except it includes a built-in two-line digital display

with 24 charactcrs per line. The 7506 also has an optional ADM-T for simultaneous voice and data

operations.

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The 7507 is a VOM-T equipped with a two-line 40-character display. The display gives access to

the Display — Voice Terminal feature. The 7507 also has an optional ADM-T for simultaneous
voice and data operations.

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The 7500 UDM is designed to connect unattended data terminal or communications equipment to the

ISDN network. The 7500 has no voice functions and cannot be linked to the voice terminal.

The 7500 voice terminals must be powered by either local or satellite closet power (see chapter 12,
Adjunct Power Supplies).  BRI signal lines use a terminating resistor (TR) as part of their configuration.
Placing the TR at the 7500 workstation provides the maximum range between the terminal and the

switch. Placing the TR in the satellite closet provides the maximum manageability and aesthetic appeal.

For all 7500 BRI terminals, placing the terminating resistor in the satellite closet produces a total loop
range of 1500 ft. For direct inside wiring (DIW, a maximum of 250 ft of the total 1500 ft range is
available between the closet and the terminal. If the TR is at the work location, the maximum range
between the terminal and the switch is a maximum of 1900 ft.