AT&T DS1/DMi/ISDN-PRI manual SS7

		GLOSSARY	GL-19
Software		An AT&T private networking service created by specialized software within the
Defined		public network. SDN is designed to carry voice and data traffic between
Network (SDN)		customer locations as well as to off-network locations, and offers a pricing
		structure based on communications usage, distance, and access-line charges.
special access		A provision whereby a telephone, data terminal, or communications system can
		be provided with connections directly into a long-distance carrier service,
		bypassing the local central office (CO).
SS7		See signaling system number 7.
	station	The direct distance dialing (DDD) address — consisting of 10 digits with the
identification		North American numbering plan (NANP) — of the originating party provided in
(SID) number		the address-digits field of the calling-party-number information element (IE) in
		the Integrated Services Digital Network primary rate interface (ISDN-PRI) setup
		message. See also ISDN SID-ANI.
stimulus		A signaling method that reports stimuli but does not request specific operations.
signaling		With stimulus signaling, a button press is reported simply as a button press, not
		as the activation of the feature associated with the button, as with functional
		signaling. The signaling in the Digital Communications Protocol (DCP) message
		set is primarily stimulus signaling. See also functional signaling.
switched access		A call that originates from a local exchange carrier (LEC) to an inter-LATA
		(local access and transport area) carrier network.
synchronization		The process in which proper phase alignment to a transmitter is made so that the
		beginning and end of a character, message, time slot, or frame can be readily
		identified for information retrieval.
synchronous		A method of transmitting data in which discrete signal elements are transmitted
data		at a fixed and continuous rate. Synchronous data transmission requires that the
transmission		timing of the transmission be synchronized between the sending and receiving
		devices. Also called synchronous transmission. See also asynchronous	data
		transmission.
synchronous		See synchronous data transmission.
transmission
T1		A digital transmission standard that in North America carries traffic at the
		digital signal level-l (DS1) rate of 1.544M bps.
T1 digital		A type of digital transmission medium that transmits at 1.544M-bps and is
carrier		capable of carrying 24 channels.
tandem tie-		A private network that interconnects several customer communications systems
trunk network		by dial-repeating tie trunks. Access to the various communications systems is
(TTTN)		dictated by codes that must be individually dialed for each system.
TCM		See traveling class mark.
tenant service		A service that allows a large communications system to appear to users as many
		small independent systems, allowing a single system to be shared among a wide
		assortment of user groups called tenants. Tenant Service is useful for major

airports, industrial parks, large medical centers, and large office complexes. See also partitioning.