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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
ISDN Voice Terminals
17-26The ISDN 8503 Voice Terminal
17
Terminating Resistors
The terminating resistor jumpers are located on the bottom of the voice terminal
under a sliding plate between the Line jack and Adjunct jack. These jumpers
enable (ON) or bypass (OFF) the terminating resistor. The set is shipped with the
jumpers in the OFF position bypassing the terminating resistor. You must verify
that the jumper settings are set correctly for your configuration.
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 configuration 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 configuration 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.