ARA-1 Operations Manual
6
INTEROPERABILITY NOW
Glossary
ATA
Analog Telephone
Adapter
A device that interfaces an analog telephone to a SIP
network.
COR
Carrier Operated Relay
A signal from a receiver that indicates when a carrier or
signal is being received and the receiver is unsquelched.
Sometimes called COS (Carrier Operated Squelch).
COS
Carrier Operated
Squelch
See COR.
DHCP
Dynamic Host
Configuration Protocol
A method of automatically assigning a dynamic IP
address to an Ethernet device at startup time. DHCP
conserves IP addresses in networks among devices that
do not stay permanently connected.
DSP
Digital Signal Processor
A type of microprocessor, optimized for signal
processing functions.
IP
Internet Protocol
A protocol designed to allow communications between
computers on different networks.
LAN
Local Area Network
A group of computers and associated devices that share a
common communications line, typically within a small
geographic area. Compare with
WAN
.
PBX
Private Branch
Exchange
A private telephone system serving an office, campus, or
similar setting.
PTT
Push-to-talk
A signal to a radio that activates the transmit function
and controls the actual transmission of radio frequency
energy over the air. Also called a keyline.
SIP
Session Initiation
Protocol
A protocol for initiating, modifying, and terminating
multimedia sessions.
SIP Phone
A telephone that uses SIP as its signaling protocol.
Soft Phone
A computer program that provides SIP Phone capability.
TCP
Transmission Control
Protocol
An additional layer to the
Internet Protocol
, which
ensures delivery of packets sent across the network. It
can resolve situations such as lost packets or packets
arriving out of order. Compare with
UDP
.
UDP
User Datagram Protocol
An additional layer to the
Internet Protocol
, which does
not ensure delivery of packets, but which offers more
speed and lower transmission overhead than
TCP
.
URI
Universal Resource
Identifier
A string of characters that identify (name) a resource to
facilitate interactions over a network.
VoIP
Voice over Internet
Protocol
A method of sending voice communications across a
digital network.
WAN
Wide Area Network
A network that is spread out over a wide geographic
area, such as around a city or state. It may include other
public or shared networks. Compare with
LAN
.