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Figure 4-1
CO NF IG
Connecting a Digital Telephone with an External Power Supply
This section describes how to connect an ISDN telephone that requires an external power
supply to the router. Depending upon the ISDN telephone model and power supply model
you use, the procedure to connect the ISDN telephone and power supply might differ
slightly. This example procedure describes how to connect an AT&T ISDN telephone
(model ISDN 8510T) and an AT&T external power supply (model MSP-1). Also refer to
the instructions provided by the manufacturer of the telephone.
ISDN Telephone to Router Connection (Cisco 766 Shown)
10 BA SE T
Li nk
N O D E
H U B
IS D N S /T
IS D N U
S
0
N T -1
RJ-45-to-RJ-45 cable
+5 V --- 1.5
A +/- 5%
-30 V- -- 0.2
A +/- 25 %
RJ-45-to-RJ-45 cable
ISDN telephone
ISDN and Analog Telephone Devices 4-3
ISDN wall jack
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Troubleshooting
