Cabletron Systems 520 - Manual (Page 69)

Supporting ISDN for the SSR-510
5-3
Obtaining a Network Termination Device
In the United States the telephone company provides you with a U-interface
connection. Because of this, you need a network termination device (NT1) to
convert the U-interface to the S/T-interface. In Europe and other parts of the
world, an NT1 is not required because an S/T-interface is provided.
The network termination device (NT1) provides network termination
functions to your basic rate interface (BRI) connection. The NT1 device
allows you to add S/T-interface devices to your ISDN connection.
Depending on your country, you may need an NT1 device to connect the
SSR-510 to your ISDN line. Check with your local telephone company or
your authorized Cabletron Systems reseller to see if they can provide one for
you.
Make sure the NT1 device you choose has the following items necessary to
connect the router to the ISDN line:
• Power supply, either integrated or separate.
• Cable to attach the NT1 device.