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

Glossary

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

 

Alink-layer protocol on the ISDN-BRI and 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.

local area network

Ashort-range data communication network providing high-speed carrier service with low error rates. Generally, a LAN is limited in range to a maximum of 6.2 miles. Ethernet and Token-Ring are common LAN architectures. See wide area network, Ethernet.

looparound testing

M

Checking an interface by sending a signal through the output, across a medium (the loop), and back through the input. Internal looparound tests run against the internal circuitry of the card. External looparound tests check the connectors at the edge of the card using a fiber or wire loop. PRI, Ethernet, and ATM cards are tested this way.

MAC

Media Access Control; a sublayer of the OSI Data Link layer, provides an interface with the network adapter.

main-satellite-tributary

A private network configuration that can either stand alone or access an ETN. A main switch provides interconnection, via tie trunks, with one or more subtending switches, called satellites; all attendant positions for the main/satellite configuration; and access to and from the public network. To a user outside the complex, a main/satellite configuration appears as one switch, with one listed directory number (LDN). A tributary switch is connected to the main switch via tie trunks, but has its own attendant positions and LDN.

Management Information Base (MIB)

A virtual database used by the Simple Network Management Protocol (SNMP).

MAPD

Multiapplication platform for DEFINITY.

MA-UUI

Message-Associated User-to-User Signaling.

M-Bus

Memory bus.

Administration for Network Connectivity

 

 

555-233-504 — Issue 1 — April 2000

CID: 77730

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Lucent Technologies Release 8.2 manual Mac, Mapd, Ma-Uui