AT&T System 85 manual 8503T voice terminal is FCC registered

ISDN 8503T Voice Terminal

Note: The terminating resistor jumpers must be set only by qualified service personnel.

The terminating resistor jumpers must be set to OFF when the set is in a point-to-point configuration and the terminating resistor is in the closet or a 440A4 is connected on the line.

The terminating resistor jumpers must be set to ON when the set is in a point-to-point configuration and the terminating resistor is not in the closet or a 440A4 is not connected to the line.

The terminating resistor jumpers must be set to OFF when the set is in a multipoint confi- guration and the terminating resistor is in the closet, a 440A4 is connected on the line, or the jumper is set to ON in one of the other sets on the line.

The terminating resistor jumpers must be set to ON when the set is in a multipoint confi- guration and the terminating resistor is not in the closet, a 440A4 is not connected on the line, or the jumper is not set to ON in any of the other sets on the line.

Switch Administration

The 8503T voice terminal should be administered as an ISDN 7505 voice terminal.

Note: The three call appearance/feature buttons can be used for call appearances or features, but, for most effective use of the voice terminal, it is strongly suggested that all three buttons be administered for call appearances.

Power Failure Operation

The 8503T voice terminal cannot be used as an emergency station during power failure transfer conditions.

FCC Registration

The 8503T voice terminal is FCC registered.

Hearing Aid Compatible

This voice terminal is compatible with the inductively coupled hearing aids prescribed by the FCC.

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