Cisco Systems ATA 186, ATA 188 manual GL-2

Glossary

compression

CoS

The running of a data set through an algorithm that reduces the space required to store or the bandwidth required to transmit the data set. Compare with companding and expansion.

Class of service. An indication of how an upper-layer protocol requires a lower-layer protocol to treat its messages. In SNA subarea routing, CoS definitions are used by subarea nodes to determine the optimal route to establish a given session. A CoS definition comprises a virtual route number and a transmission priority field.

D

DHCP	Dynamic Host Configuration Protocol. Provides a mechanism for allocating IP addresses dynamically
	so that addresses can be reused when hosts no longer need them.
dial peer	An addressable call endpoint. In Voice over IP (VoIP), there are two types of dial peers: POTS and
	VoIP.
DNS	Domain Name System. System used on the Internet for translating names of network nodes into
	addresses.
DSP	Digital signal processor. A DSP segments the voice signal into frames and stores them in voice
	packets.
DTMF	Dual tone multifrequency. Tones generated when a button is pressed on a telephone, primarily used in
	the U.S. and Canada.

E

E.164	The international public telecommunications numbering plan. A standard set by the ITU-T which
	addresses telephone numbers.
endpoint	A SIP terminal or gateway. An endpoint can call and be called. It generates and/or terminates the
	information stream.
expansion	The process of running a compressed data set through an algorithm that restores the data set to its
	original size. Compare with companding and compression.

F

firewall		Router or access server, or several routers or access servers, designated as a buffer between any
		connected public networks and a private network. A firewall router uses access lists and other methods
		to ensure the security of the private network.
FoIP		Fax over IP
FQDN		Fully Qualified Domain (FQDN) format “mydomain.com” or “company.mydomain.com.”
FSK		Frequency shift key.
		Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SCCP)
	GL-2	OL-3141-01