Cisco 700 series, Installation Manual

Page: 41 / 118

Installing Your Router 3-5
Connecting the ISDN Line to the S/T Port
The S/T port connects to some telephone service provider networks using an external NT1.
The need for an external NT1 is determined by your telephone service provider network.
Note
If you are interested in the technical aspects of S/T ports, additional information can
be found in the “ISDN Ports” section of Chapter 6, “Concepts and Descriptions.”
Caution
Always connect the orange cable to the orange S/T port on the router.
Do not connect the cable to a yellow Ethernet port. This will damage your router.
To connect an ISDN line to the S/T port of a router when your telephone service provider
said that an NT1 is not required, complete the following steps:
Step 1
Connect the orange S/T cable to the orange port labeled S/T on the rear panel of
your router.
Step 2
Connect the other end of the orange S/T cable to the ISDN wall socket. (See
Figure 3-2.)