Sierra Wireless DART 200 CDPD Modem manual Terms, 42bis, Asynchronous Authentication

DART 200 CDPD Modem User’s Guide Glossary

UA

UDP

Unnumbered Acknowledgement

The MDIS response to a SABME from the M-ES when a CDPD link is being established.

User Datagram Protocol

V.42bis

WASI

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.

A data compression standard. Optionally used in CDPD to reduce traffic between the modem and the MDIS. Can improve throughput in high volume applications.

Wide Area Service Identifier

XID

X-OFF

A unique identifier for a business group of licensed CDPD service providers. Used as a marketing identifier (CDPD 1.1 only)

A type of MDLP frame used to exchange configurable communication protocol parameters between an M-ES, MDBS and/or MD-IS.

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

authentication

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.

The CDPD procedure used to ensure that the user of an NEI is legitimate. This procedure occurs during modem registration.

Sierra Wireless, Inc. Glossary-8