02-CML000057
Precidia Technologies Inc.
A-1
Appendix A: Glossary of Terms
and Acronyms
ARP
Address Resolution Protocol.
A TCP/IP protocol used to convert an IP address
into a physical address, such as an Ethernet address. Defined in RFC826.
AT
Attention.
Modem command prefix.
BpP
Bytes per Packet.
bps
Bits per second
. The standard measure of data transmission speeds.
CGI
Common Gateway Interface.
A standard for running external programs from a
World Wide Web HTTP server.
CPU
Central Processing Unit.
CRC
Cyclic Redundancy Checking.
An error checking method that uses a 16 or 32-bit
polynomial that is derived from, stored and transmitted, with a block of data, in
order to detect corruption.
CSU
Channel Service Unit.
A device that performs protective and diagnostic functions
for a telecommunications line.
CTS
Clear To Send.
A modem signal line (pin 8 of DB-9 connectors), used for hard-
ware flow control. It is the counterpart to Request To Send (RTS). When the
remote end is ready to receive data, it sends a CTS signal to the local computer to
start transferring data.
DB-9
DB-xx
is the designation for a series of port connectors for attaching devices to
computers. DB-9 specifically is a standard 9-pin, D-shell connector, used for RS-
232 serial communications.
DCD
Data Carrier Detect.
A modem signal line (pin 1 of DB-9 connectors).
DCE
Data Communications Equipment.
It is the interface that a modem or other serial
devices use to exchange data with a computer.
