GL-1

Glossary

5ESS: This is a digital switch used by many telephone companies and designed by AT&T. This switch provides both voice, data, and ISDN services and is capable of running either Custom or National ISDN (NI-1) software.

56 Kbps: The speed of an ISDN call when going between LATA boundaries without the use of out-of-band signaling. See also SS7.

64 Kbps: The speed of an ISDN call when going between LATA boundaries with the use of out-of-band signaling. See also SS7.

asynchronous: A method of data transmission in which data is sent at irregular intervals. Start and stop bits signal the beginning and end of a transmission.

autobaud: feature that automatically detects the baud rate of your computer’s serial port and matches the ISDN modem’s baud rate to that rate.

B channel: Bearer channel. A 56 Kbps or 64 Kbps ISDN channel which is used in both the Basic Rate Interface and Primary Rate Interface and carries a voice or data call. The 56 Kbps or 64 Kbps limitation depends on the use of in-band or out-of-band signaling.

Bellcore: Bell Communications Research. Bellcore was part of Bell Laboratories before the breakup of AT&T and plays a leading role in developing ISDN standards.

BRI: Basic Rate Interface. An ISDN interface consisting of three full

duplex channels: two 64 Kbps B Channels and one 16 Kbps D Channel (2B+D). The 2B+D U Interface requires a single twisted-pair of wires and carries no voltage or dial-tone.

CHAP: Challenge Handshake Authentication Protocol. A method of security which involves an exchange of encrypted passwords to verify the user.

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