Connecting The Isdn Line To The U Port - Cisco 761M Installation Manual

Figure 3-3
C O N FI G

Connecting the ISDN Line to the U Port

The U port connects to the telephone service provider network using the internal NT1.
Figure 3-4 shows the ISDN U port connection.
Caution
connect the cable to a yellow Ethernet port. This will damage your router.
Connecting to the ISDN S/T Port When an NT1 Is Required
4
10 BA SE T
3
CI SC O 77
6
2
1
IS D N S /T
IS D N U
S
0
N T -1
Connect orange cable
to orange ISDN S/T port
Connect orange
cable to NT1
Always connect the red cable to the red U port on the router. Do not
+5 V --- 1.5
A +/- 5%
-30 V- -- 0.2
A +/- 25 %
Connect ISDN U
cable to NT1
Connect NT1
power cord to
electrical outlet
Connect cable to
ISDN wall jack
Installing Your Router 3-7