61200305L1-1 ATLAS 550 User Manual G-1
Appendix G
Glossary
10/100BaseT Ethernet connection
The ATLAS 550 RJ-48C port that provides Ethernet LAN connection for TFTP, SNMP, andTelnet.
A-Law
PCM coding method as defined by the ITU-T. It is a companding standard for converting between
analog and digital in a PCM system. A-Law is mainly used in Europe. ยต-Law is the North American
equivalent.
AMI
Alternate mark inversion. A Layer 1 line code used in a T1 carrier. Zeros are transmitted as zero volts,
and ones are transmitted as pulses that alternate polarity. Although B8ZS is an enhancement to AMI,
B8ZS and AMI are normally referred to as mutually-exclusive options for a T1. (See also B8ZS.)
ANI
Automatic Number Identification. Service provided by a local phone company that provides incoming
Caller ID information.
Annex A
Standard for frame relay signaling as defined by the International Telecommunication Union Telecom-
munication in publication Q.933-A.
Annex D
Standard for frame relay signaling as defined by the American National Standards Institute (ANSI) in
publication T1.617-D.
ANSI T1.617-D (Annex D)
See Annex D.
ARP
Address Resolution Protocol. A protocol that maps an IP address to an ethernet MAC address.
ANSI T1.617-D (Annex D)
See Annex D.
ATLAS 550
A bandwidth management system which functions as a central site multiplexer. (See also Integrated
Access System.)
B channel
Bearer channel. Bearer channels of an ISDN service carry provide data transmission. Compare with
D channel.
