AT&T DS1/DMi/ISDN-PRI Binary service, Format, Parameterized service format, Bipolar with, Zero

GL-4GLOSSARY

binary service	One of two network specific facility (NSF) service types that are administered in
format	conjunction with the Automatic Alternate Routing/Automatic Route Selection
	(AAR/ARS) routing patterns. The binary service format conveys in a single
	byte all the necessary information for the service or facility. See also
	parameterized service format.
bipolar with 8-	An unrestricted or clear channel line-coding format that detects strings of eight
zero	consecutive zeroes in the DS1’s signal and encodes these zeros (including framing
substitution	bits) into a unique bipolar pulse sequence that meets the ones-density
(B8ZS)	requirement. This sequence is detected and decoded at the receiver. Therefore,
	digital data can be transmitted on these channels without concern about its
	content.

bit error rate

burstiness

A unit of measure indicating how successfully a digital signal is being transmitted. Typically, bit error rate is expressed as a number of bit errors per 1,000 or 1,000,000 bits.

A network transmission impairment where the error burst is 10-2or worse and often results in an out-of-frame condition. A single error burst of 2.5 seconds or less will not generate an alarm.

BX.25	An AT&T version of the CCITT X.25 protocol for data communications.
	BX.25 adds a fourth level to the standard X.25 interface. This uppermost level
	combines levels 4, 5, and 6 of the International Standards Organization (ISO)
	reference model. See also CCITT, Flexible Assignment of BX.25 Signaling
	Ports, packet switching, and X.25.
Call-by-Call	A feature that allows a communications system and/or service node to request,
(CBC) Service	on a call-by-call basis, services and/or features for a particular call on an
Selection	Integrated Services Digital Network primary rate interface (ISDN-PRI) facility.
	These services and/or features are selected with the call-setup message using
	network-specific facilities, bearer capability, and destination-address information
	elements (IEs). CBC allows various voice and data services, such as
	MEGACOM ® , Software-Defined Network (SDN), and ACCUNET® digital
	service, to be integrated onto a single transmission facility with flexible
	assignment of trunks to services.
CCITT	(Comitée Consultatif International Telephonique et Telegraphique) an
	international body that sets universal standards for data communications,
	including Integrated Services Digital Network (ISDN). CCITT members are
	from telecommunications companies and organizations around the world. See
	also BX.25 and Q recommendations.
CCSA	See Common-Control Switching Arrangement.
CDM	See channel-division multiplexer.