Sierra Wireless DART 200 CDPD Modem - Manual (Page 188)

DART 200 CDPD Modem User’s Guide Glossary
Sierra Wireless, Inc. Glossary-8
UA Unnumbered Acknowledgement
The MDIS response to a SABME from the M-ES when a
CDPD link is being established.
UDP User Datagram Protocol
A low overhead, nonguaranteed packet delivery IP
protocol A standard TCP/IP protocol that allows an
application on one machine to send a datagram to another
application on another machine.
V.42bis A data compression standard. Optionally used in CDPD
to reduce traffic between the modem and the MDIS. Can
improve throughput in high volume applications.
WASI Wide Area Service Identifier
A unique identifier for a business group of licensed
CDPD service providers. Used as a marketing identifier
(CDPD 1.1 only)
XID A type of MDLP frame used to exchange configurable
communication protocol parameters between an M-ES,
MDBS and/or MD-IS.
X-OFF Transmission (of data) Off
A short message, sent by the receiver to the sender, to
cause data transmission to the be suspended. When the
receiver is ready to proceed, it sends an X-ON to cause
transmit resumed.
X-ON Transmission (of data) On
A short message, sent by the receiver to the sender, to
cause a suspended transmission to be resumed.
Terms
asynchronous A method developed to transmit randomly occurring
characters as they appear. Each character (usually 8 bits)
is preceded by a start bit and followed by at least one stop
bit to maintain bit synchronization between the
transmitting device and the modem.
authentication The CDPD procedure used to ensure that the user of an
NEI is legitimate. This procedure occurs during modem
registration.