AT&T 7500 series, 7100 series, 2500 series, 7200 series, 7400 series, 7300 series Ccis, Cor, Cos, Cpe

GL-6GLOSSARY

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class of service (COS)	1. On the System 75 and Generic 1, a number (0 through 15) that specifies
	a group of feature-access permissions of a group of telephones. COS
	specifies whether telephone users can activate certain features such as
	Automatic Callback and Call Forwarding — All Calls, Data Privacy, and
	Priority Calling. See also class of restriction. 2. On the System 85 and
	Generic 2, a numeric code that specifies a group of feature-access
	permissions and calling-privilege restrictions that together determine the
	privileges of a group of extension numbers. See also class of restriction.
clear-channel signals	See 24th-channel signaling.
CO	See central office.
codepoint	A numeric value for a specific field of an information element (IE) and
	used as part of a Q.931 message, thus allowing identification and
	processing of the IE. For example, in the network-specific facilities IE,
	the value 1 in the feature/service field means that the requested facility is a
	service. See also Q.930 and Q.931.
Comite’e Consultatif	See CCITT.
International
Telephonique et
Telegraphique
common-channel	Signaling in which signaling information for each of the 23 information
interoffice signaling	channels is multiplexed into a separate "common" channel. For AT&T
(CCIS)	products, the 24th channel is used as the common channel. See also
	signaling system number 7.
common channel	See 24th channel signaling.
signaling
communications system	The software-controlled processor complex that interprets dialing pulses,
	tones, and/or keyboard characters and makes the proper interconnections
	both within the system and external to the system. The communications
	system itself consists of a digital computer, software, storage device, and
	carriers with special hardware to perform the actual connections. A
	communications system provides voice and/or data communications
	services, including access to public and private networks, for telephones
	and data terminals on a customer’s premises. See also switch.
COR	See class of restriction.
COS	See class of service.
CPE	See customer-premises equipment and customer-provided equipment.
	Both terms are abbreviated to CPE.

CPU See central processing unit.