AT&T DS1/DMi/ISDN-PRI manual GL-9, Eia, Etn, Epscs, See extended superframe

		GLOSSARY	GL-9
EIA	A trade association of the electronics industry that establishes electrical and
(Electronics	functional standards.
Industries
Association)
EDSL	See extended digital subscriber line.
electronic	A private network that consists of private and public trunking and switching
tandem network	resources. ETNs often span geographic areas and consist of private or leased
(ETN)	transmission facilities that interconnect the customer’s communications systems.
	An ETN uses Automatic Alternate Routing (AAR) with a uniform numbering
	plan to address the various communications systems and telephones in the ETN.
end-to-end	An administration attribute whereby the user can designate via an option
ISDN	whether or not ISDN facilities are required to complete the call. The three
connectivity	available options are as follows: ISDN facilities are required, ISDN facilities are
	preferred, and any facilities can be used. See also Integrated	Digital Services
	Network.
Enhanced	An analog private telecommunications network based on the No. 5 Crossbar and
Private	1A ESS™ that provides advanced voice and data telecommunications services to
Switched	companies with many locations.
Communications
Service
(EPSCS)
EPSCS	See Enhanced Private Switched Communications Service.
errored second	A second in which at least one bit error occurs.
(ES)
ES	See errored second.
ESF	See extended superframe.
ETN	See electronic tandem network.
exclusive-	See channel negotiation.
channel request
extended digital	The name used for the Integrated Digital Services Network primary rate interface
subscriber line	(ISDN-PRI) provided by a 5ESS® central-office (CO) switching system.
(EDSL)
extended	A format of 24 frames. See also frame.
superframe
(ESF) framing
format
external clock	A high-accuracy clock reference used by switching nodes within a private
reference	network to maintain proper network synchronization when internal clocks prove
	inadequate (such as a direct connection to public-network-quality clocks).
facility	Signaling in which a D-channel carries the signaling only for those channels on
associated	the same physical interface. See also nonfacility-associated	signaling.
signaling (FAS)