AT&T DS1/DMi/ISDN-PRI manual Isdn SID-ANI Lata LFA, Station identification number, Loss of signal

GLOSSARY GL-13

ISDN SID-ANI

LATA

LFA

link-access procedure on the D-channel (LAPD)

local exchange company (LEC)

A capability that can provide to a called party either the station identification number (SID) or automatic number identification (ANI). The SID is passed as user information; ANI is passed via the call setup.

If the SID is used to access internal network information about the calling party, the user obtains information such as the calling party’s location, name, office number, and type of telephone — information that is administered on the communications system. ANI can be used to retrieve records such as customer accounts, field service records, and sales records, that are indexed by telephone number.

The SID/ANI capability can be used in telemarketing, customer service, and other business applications. See also automatic number identification and

station identification number.

Local access and transport area.

See loss of frame alignment.

A link-layer protocol on the Integrated Services Digital Network basic rate interface (ISDN-BRI) and primary rate interface (ISDN-PRI) data-link layer (level 2). LAPD provides data transfer between two devices, and error and flow control on multiple logical links. LAPD is used for signaling and low-speed packet data (X.25 and mode 3) on the signaling (D-) channel and for mode-3 data communications on a bearer (B-) channel.

A company franchised to provide public intra-LATA (local access and transport area) telephone service to subscribers within a defined geographical area. Also called a local exchange carrier or local telephone company.

Look-Ahead	A feature that enhances the forwarding of calls from a vector so that calls will be
Interflow	forwarded only to those remote locations that can accept the calls.
LOS	Loss of signal.
loss of frame	The loss of frame alignment (RFA) alarm, when received at the far end switch,
alignment	indicates that the near end switch is unable to frame up on the signal sent by the
(LFA) alarm	far end (the end sending this alarm). Also called the red alarm. See also remote
	frame alarm and loss of signal.
loss of signal	The loss of signal (LOS) alarm indicates that there is no bipolar signal present at
(LOS) alarm	the ISDN-PRI receiver input. This alarm will occur in parallel with the loss of
	frame alignment (LFA) alarm. See also remote frame alarm.
maintenance	A device used by service technicians to administer a DIMENSION® PBX or a
and	System 85. See also visual maintenance and administration panel.
administration
panel (MAAP)
maintenance	A term used by the AT&T Services organization for a unit that can be
object (MO)	maintained. An MO can be a hardware component — for example, a circuit
	card, telephone, or trunk — or a software process.
MEGACOM ®	AT&T's tariffed digital WATS offering for outward calling. See also 800
	service.