User`s manual

Am186™CC Microcontroller Router Reference Design User’s Manual
E-1
Appendix E
Glossary of Terms
2B+D - Describes the BRI configuration for ISDN of two bearer channels and one
D channel.
2B1Q - Two binary, one quaternary, data format for the U-interface. One quaternary
symbol (±3, ±1) represents two bits.
10BaseT Ethernet - A popular type of Ethernet network using twisted-pair cable
and RJ-45 connectors. (See RJ-45.)
B Channel - Bearer channel, 64kbps voice/data channel for ISDN.
bps - Bits per second.
BRI - Basic Rate Interface. The simple 2B+D access method defined by CCITT
recommendation I.430.
CCITT/ITU - International Telegraph and Telephone Consultative Committee /
International Telecommunications Union. ITU is an agency of the UN. CCITT is
a committee of the ITU which makes recommendations for network
communications.
C.O. - Central Office.
CPE - Customer Premises Equipment. Devices such as the NT1, designated to be
the customer's responsibility to provide.
D Channel - 16-Kbit/s channel used to carry out-of-band network signaling or
packet-mode user data. (Refer to the ITU standards found at www.itu.ch.)
DSLAC - A single device containing two SLACs. (See SLAC.)
DTMF - Dual Tone Multi Frequency - An audio signal containing two distinct
tones used for “touch-tone” telephone dialing and signalling.
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