ISDN Line Ordering and Configuration
24 CSX400 and CSX400-DC User’s Guide
Telephone Switch Support
Your telephone company may offer a variety of ISDN switch types. You must contact your service
provider and find out which type of ISDN service is available.
The following switch types are currently supported by the CSX400 within the U.S.:
•National ISDN 1 (NI-1)
•AT&T 5ESS with Custom Software
•DMS-100
Outside of the U.S. the following switch types are currently supported:
•NET3 (European ISDN)
•NET3SW (European Swiss-variant)
•NTT (Nippon Telegraph and Telephone)
•KDD (Kokusai Denshin Denwa Co., Ltd.)
•French Delta (VN4) switches
ISDN BRI Line Configuration
You need to order one Basic Rate Interface (BRI) ISDN line from your service provider. The Basic
Rate Interface ISDN line provides two full duplex 64 (Kbps) B channels used for voice, data, fax,
etc. and one full duplex 16 Kbps channel used for signaling. Each B channel can be used for a call;
i.e., two calls can occur at the same time. Services vary from individual service providers.
The service provider requires some information from you about your configuration. You must
provide your service provider with the required switch settings for the provider’s telephone switch
(see Telephone Switch Parameters in this chapter). Consult with your service provider at least
two months before requiring the installation and use of the ISDN service.
NOTE Full 64 Kbps for each channel (called clear channel) may not be available across the
entire communications link. Today, many providers still use in-band signaling
(the 8 Kbps signaling is taken from the B channel bandwidth) so that you may only
achieve a 56 Kbps channel speed.