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Glossary
Appendix B
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; µ-Law is the North American
equivalent.
ANSI T1.617-D (Annex D)
See Annex D.
Annex A
Standard for frame relay signaling as defined by the International Telecommunication Union Telecom-
munication Standardization Sector (ITU-T) 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.
ARP
Address Resolution Protocol. A protocol that maps an IP address to an ethernet MAC address.
BECN
Backward Explicit Congestion Notification. Sent to the device generating excessive frame relay traffic
as a means to slow down the flow of data to the network. Compare with FECN.
Bridge IP
This is a way to have a virtual ethernet port using Frame Relay or PPP. The IP packets destined for an
interface running this protocol will be encapsulated with an ethernet header, using the MAC adress of
the real ethernet port. This packet is encapsulated over the resulting WAN protocol, PPP or Frame
Relay, to be sent to the peer.
Burst
A sporadic increase in a transmission.
Bursty traffic
Traffic that alternates between steady transmission and short bursts of high transmission.
CHAP
Challenge Handshake Protocol. This is an authentication protocol that uses a one-way hashing algo-
rithm to encrypt the username and password. This hashing algorithm makes it virtually impossible to
determine the password.
61200263L1-1.1
ATLAS Frame Relay User Manual
B-1
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