Appendix C: WAN Terms and Acronyms
C-4
WPIM-S/T User’s Guide
LMP
Link Management Protocol, used in Frame Relay. Allows
the device to gather information about the DLCIs (Data
Link Connection Identifiers) See T1.617-D, Q.933-A.
local timing
Timing for digital transmission circuit is internally
generated by a source within the equipment. Usually
used for short haul private lines. In this case one CSU
must be set for Local (internal) timing and the CSU at the
other end of the line must be set for Loop (recovered)
timing to create a master-slave situation.
loop timing
Timing for digital transmission circuit is recovered from
the received data, not generated internally by a source
within the equipment. This is the typical situation when
using public lines.
MIM
Media Interface Module, Cabletron Systems products
designed to fit in a Multi Media Access Center (MMAC)
hub.
Multi-Link
Protocol
(MLP)
Defined in RFC 1717, a protocol that defines performing
inverse multiplexing on the TCP/IP point-to-point
protocol (PPP), ie., the ability to use multiple serial WAN
channels for transferring one data stream. With MLP, a
user can send and receive data over both B channels in an
ISDN BRI connection.
MUX
Multiplexer, an electronic device that allows two or more
signals to pass over one communications circuit.
nailed-up
PPP
A permanent, leased line using that has a flat fee. The line
is always connected, as it is not a switched connection.
PPP
Point-to-Point Protocol, provides a method for
transmitting datagrams over serial point-to-point links.
PRI
Primary Rate Interface, an ISDN service providing 23
“B” (Bearer) channels of 64 Kbps and one 64 Kbps “D”
(Data) channel for signaling and control.
PVC
Permanent Virtual Circuit, a virtual circuit that provides
the equivalent of a dedicated private line service.
