Cisco CISCO776 Installation Guide - Page 43
Connecting the ISDN Line to the U Port,
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Figure 3-3 Connecting to the ISDN S/T Port When an NT1 Is Required CONFIG 4 3 10BA2 SET CISCO 776 1 ISDN S/T ISDN U S0 NT-1 +-350VV------10.5.2AA++/-/-52%5% Connect orange cable to orange ISDN S/T port Connect orange cable to NT1 Connect ISDN U cable to NT1 Connect NT1 power cord to electrical outlet Connect cable to ISDN wall jack 17258 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 Always connect the red cable to the red U port on the router. Do not connect the cable to a yellow Ethernet port. This will damage your router. Installing Your Router 3-7
![](/manual_guide/products/cisco-776m-installation-guide-780c93a/43.png)
Installing Your Router
3-7
Figure 3-3
Connecting to the ISDN S/T Port When an NT1 Is Required
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
Always connect the red cable to the red U port on the router. Do not
connect the cable to a yellow Ethernet port. This will damage your router.
CONFIG
1
+5V ---1.5A +/-5%
-30V--- 0.2A +/-25%
S
0
NT-1
ISDN U
ISDN S/T
10BASET
CISCO 776
2
3
4
17258
Connect orange cable
to orange ISDN S/T port
Connect orange
cable to NT1
Connect ISDN U
cable to NT1
Connect cable to
ISDN wall jack
Connect NT1
power cord to
electrical outlet