Carrier Access Access Navigator user manual Electronic Business Set Or Service

Glossary

E1	European CEPT digital signal level 1, similar to the North American DS1 except
	that the E1 information rate is 2.048 Mbps and transports 30 DS0 signals,
	compared to the 24 DS0 signals in the North American DS1. E1 also employs a
	separate signaling channel instead of using robbed-bit signaling, so all 8 bits of the
	DS0 are used to code the wave shape of the digitized voice sample.

Electronic

Business Set

(or Service)

See P-Phone.

Embedded	EOC. The GR-303 switch system communicates with the Access Navigator using
Operations	an EOC and Timeslot Management Channel (TMC) in the GR-303 Interface
Channel	Group (IG). The EOC carries management data (provisioning, messages, and
	alarms), while the TMC carries call setup data. The switch sets up crossconnects
	in the Access Navigator between switch DS0s and drop DS0s. Each drop DS0 is
	identified by a unique Call Reference Value (CRV).
Extended	ESF. A North American format for DS1 rate signals at 1.544 Mbps that extends
Superframe	the capability of the Superframe (or D4) format to include a 4 Kbps facility data
	link channel by using some of the 8 Kbps overhead used for synchronization.
Facility Data	FDL. An out-of-band communications link used for traffic maintenance. The DS1
Link	Extended Superframe (ESF) format provides an FDL channel with 4 Kbps data
	rate.
Failure	A termination of the ability of an item to perform a required function. A failure is
	caused by the persistence of a defect.
Filling	Consolidating traffic into one line, such as a DS1, for more efficient transport.
Foreign	FX. A telephone service providing local access to a central office that is outside
Exchange	of (foreign to) the subscriber's local exchange area. A Foreign Exchange Office
	(FXO) provides dial tone to a Foreign Exchange Station (FXS).
Fractional	A service interface using only a portion of the available capacity. In the Access
Interface	Navigator, this term refers to a DS1 or T1 connection using fewer than 24 DS0s.
	The fractional interface is a group of sequential DS0s in the same DS1, such as
	DS0s 19 through 24.
Framing	An error control format used to multiplex digital data, such as DS0 channels, into
	larger frames, such as DS1 (T1) and DS3. Frames contain time slots for each
	channel’s data and include a framing bit to synchronize the receiver so it can de-
	multiplex the data and recover the individual channels. The most common
	framing for DS1 transport are D4, S4, and ESF.
Frequency	The number of cycles of periodic activity that occur in a discrete amount of time.
Gateway	Any device that passes packets from one network to another network in their trip
	across the Internet. A gateway usually has its own network IP address.

GlossaryGlossaryGlossaryGlossary-8 August 2003 Access Navigator - Release 1.8