Farallon Communications 612 Benutzerhandbuch

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.