What is ISDN?
ISDN cards and Terminal adapter's are like modems, but 5 times faster. They require special telephone lines, which cost a little (or a lot, depending on your phone company) more than normal phone lines.

ISDN calls are usually (in USA) charged by the minute, even for local calls, but this varies from state to state.

Businesses seeking fulltime connection are often better served by 56Kb/sec Frame Relay instead of ISDN.

How does a Terminal Adapter work?
A terminal adapter is a bit like a modem, but whereas a modem needs to convert between analog and digital signals, a terminal adapter only needs to pass along digital signals. As ISDN becomes more common, future computers will probably have terminal adapters built in. Currently, though, you need to purchase a separate terminal adapter if you want ISDN access. You can get an internal adapter or an external adapter than connects to your computer's serial port.

3Com ISDN

1. 3ComImpact IQ ISDN Modem Top Support Tips
2. 3ComImpact Modem Support Tips
3. Internal 3ComImpact ISDN ISA Adapter Support Tips

Ascend ISDN

1. ISDN to the Internet: A User Guide
2. Configuring Your Pipeline 25FXtm For Internet Access
3. Configuring Your Pipeline 50 ISDN For Internet Access
4. Configuring P75 ISDN For Internet Access
5. Configuring Pipeline 50/75/130 for Network Address Translation (NAT)
6. A Guide to the Pipeline 130
7. Configuring Pipeline 130 for Frame Relay
8. How To Configure a T1/ PRI Line on the Max4000/4002/4004
9. Win 95 and BitSURFER Pro - - Dialing into Ascend Products

Bell Atlantic ISDN

1. Bell Atlantic FAQ Sheet
2. Bell Atlantic Business ISDN Information Source

PacBell's FasTrak

1. PacBell's FasTrak Business ISDN
2. PacBell's FasTrak Personal ISDN

CNET what is  ISDN

Dan Kegel's ISDN Page

ISDN Infocentre

Microsoft ISDN Page

Microsoft ISDN Glossary