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link-access procedure on the D-channel (LAPD)
479
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
Glossary
link-access procedure on the D-channel (LAPD)
A link-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
A short-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
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.
M 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.