Specifications

Table Of Contents
The ISDN 8510 Voice/Data Terminal
Issue 11 December 1999
17-37
will trip the breaker in the carrier, causing a loss of service.
Recommended power supplies are the 1151A1 and 1151A2 with Battery
Holdover, and MSP-1 (local) Power Supplies and the 1145A and 1145B1 Bulk
Power Supplies.
Terminating Resistors
The terminating resistor jumpers are located on the upper left side on the bottom
of the terminal. Above the pins, on the plastic housing, you will see the label
TERM RESISTOR and a diagram of the correct settings.
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. When set to OFF, each of the two
terminating resistor jumpers covers the two top pins in each set. (The
bottom pin in each set is left uncovered.)
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. When set to ON, each of the two
terminating resistor jumpers covers the two lower pins in each set. (The top
pin in each set is left uncovered.)
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. When set to OFF, each of the two terminating
resistor jumpers covers the two top pins in each set. (The bottom pin in
each set is left uncovered.)
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. When set to ON, each of the two terminating
resistor jumpers covers the two lower pins in each set. (The top pin in each
set is left uncovered.)