61203153L2-20 Express 3000 User Manual 1-1Chapter 1 OverviewThe ADTRAN Express 3000™ is a stand-alone ISDN modem that isideal for remote access and Internet connectivity. The Express 3000transmits data at speeds up to 230.4 kbps when using hi/fn compres-sion and up to 512 kbps when using Microsoft compression. TheExpress 3000 includes ISDN terminal adapter and network termina-tion functionality, eliminating the need for an external NT-1 device.The unique modem port on the rear of the Express 3000 allows an an-alog modem and the Express 3000 to operate from the same computerserial port on a PC or Macintosh.AO/DIThe Express 3000’s Always On/Dynamic ISDN (AO/DI) technologyallows a virtual connection to a corporate network or to the Internetwhile conserving costs. AO/DI allows data transmission over the lowbandwidth D channel using the X.25 packet network. As demand forgreater bandwidth is presented to the Express 3000, B channels areadded to accommodate the increased data flow. As demand for band-width decreases, B channels are automatically disconnected to con-serve bandwidth and the cost associated with using a B channel. Touse this service, your Internet Service Provide (ISP) or remote accessprovider must support AO/DI.EXPRESS CONFIGURATION SOFTWAREADTRAN’s Express Configuration software, included with theExpress 3000, makes connecting to ISDN and configuring theExpress 3000 easy. This software includes on-line help to assist you inquickly and easily setting up your system (see also Using On-line Helpon page 3-5). Expert ISDN, part of the Express Configuration soft-ware, contains sophisticated patented algorithms that automaticallydetect the telephone company parameters such as Switch Type and
