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 ser vices 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 inter vals. Star t and stop bits signal the beginning and
end of a transmission.
autobaud:
feature that automatically detects the baud rate of your
computer’s serial por t 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 Inter face and Primar y Rate
Inter face 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 par t of Bell
Laboratories before the breakup of AT&T and plays a leading role in
developing ISDN standards.
BRI:
Basic Rate Inter face. An ISDN inter face consisting of three full
duplex channels: two 64 Kbps B Channels and one 16 Kbps D
Channel (2B+D). The 2B+D U Inter face 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 encr ypted passwords to
verify the user.