GL-1
Glossary5ESS: 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.