
Chapter 1: Understanding ISDN and the Express XL/XLT
Ordering ISDN
When ordering ISDN from the telephone company, request
ADTRAN.
Interoperability
The Express XL/XLT is standards based and uses PPP developed by Internet Engineering Task Force (IETF). PPP provides a standard method of transport- ing
Connecting to the Internet
Internet Service Providers (ISPs) assign an IP address to use when connected to their service using PPP negotiation. This assignment is based on the as- sumption that the user has an ISDN terminal adapter running PPP
The Express XL/XLT permits the user to assign any IP addresses to the unit and computers. Operations on the network can occur normally. In fact, one B- channel can connect to the ISP using NAT while the other
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