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GL-14 GLOSSARY
MEGACOM
®
800
misframe
MO
mode 3
modem
modem pooling
modular
processor data
module
(MPDM)
MPDM
multiplexer
NCTE
network
channel-
terminating
equipment
(NCTE)
network feature
network
identifier
network service
network side
network-specific
facilities (NSF)
AT&T’s tariffed digital 800-service offering for inward calling.
A condition that results when the receive endpoint fails to receive the correct
framing pattern.
See maintenance object.
A data-communications protocol consisting of the International Standards
Organization (ISO) link-access procedure on the D-channel (LAPD) at level 2
and the X.25 packet-layer procedure at level 3.
A device that converts digital data signals to analog signals for transmission over
telephone circuits. The analog signals are converted back to the original digital
data signals by another modem at the other end of the circuit. Also called a data
set.
A capability that provides shared conversion resources (modems and data
modules) for cost-effective access to analog facilities by data terminals. When
needed, modem pooling inserts a conversion resource into the path of a data call.
Modem pooling serves both outgoing and incoming calls.
A processor data module (PDM) that can be configured to provide several kinds
of interfaces (RS-232C, RS-449, and V.35) to customer-provided data terminal
equipment (DTE). See also processor data module.
See modular processor data module.
A device used to combine a number of individual channels into a common bit
stream for transmission.
See network channel-terminating equipment.
Equipment used at a customer’s premises to provide facility terminations and
signaling compatibility. Also called channel-service unit and customer-service
unit. See also data service unit.
See network service.
See ISDN network identifier.
A number or value that is used on most ISDN outgoing calls to place a specific
request on the network communications system. Also called network feature.
See user side.
An information element (IE) in an Integrated Services Digital Network primary
rate interface (ISDN-PRI) message that specifies which public-network service is
used. NSF applies only when Call-by-Call (CBC) Service Selection is used to
access a public-network service, such as MEGACOM
®
, MEGACOM
®
800, and
the Software-Defined Network (SDN).