Nt1 Required - Cisco 761M Installation Manual

Connecting the ISDN Line
Figure 3-2
C O N FI G

NT1 Required

To connect an ISDN line to the S/T port of a Cisco 761, Cisco 762, Cisco 765, Cisco 771,
Cisco 772, or Cisco 775 router when your telephone service provider said that an NT1 is
required, complete the following steps:
Step 1
Step 2
Step 3
Step 4
3-6
Cisco 700 Series Router Installation Guide
Connecting to the ISDN S/T Port When an NT1 Is Not Required
4
3 10 BA SE T
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 the orange ISDN S/T cable to the orange port labeled ISDN S/T on the
rear panel of your router.
Connect the other end of the orange ISDN S/T cable to the NT1.
Connect the ISDN cable provided with the NT1 to the NT1.
Connect the other end of the ISDN cable to the ISDN wall jack.
(See Figure 3-3.)
+5 V --- 1.5
A +/- 5%
-30 V- -- 0.2
A +/- 25 %
Connect orange cable
to ISDN wall jack