Cabletron Systems Netlink FRX4000 User Manual - page 412
glos-6
FRX4000/FRX6000 4.0 User Guide, Rev 01
LLC2
is a type of LLC that requires establishment of a connection before information can be
exchanged. (The other type of LLC is LLC1, which does not require a connection.)
Logical Channel
is a logical link between node and subscriber, on which calls are sent or received. The
physical line between devices may have a number of logical channels (also called
LCNs).
Logical DCE/DTE
see “DCE” and “DTE.”
LPDU
stands for “LLC protocol data unit,” which is the unit of information exchanged
between link stations in different nodes. The LPDU consists of destination service
access point (see “DSAP”) and source service access point (see “SSAP”) address
fields, a control field, and (optionally) information fields.
M
MAC
stands for “medium access control,” which is the second layer in the three-layer ISO
LAN protocol hierarchy. (The first layer is Physical and the third is LLC; LLC is
described in this glossary.) MAC supports medium-dependent functions, and uses the
services of the physical layer to provide services to LLC.
M-Bit
is the “more data” bit in an X.25 packet, and indicates that more information related
to the packet will follow.
N
Network
is a series of points connected by communications channels.
NMVT
stands for “network management vector transport,” which is an IBM service encoding
used in sessions between a control point and a PU (physical unit).
Node
is a physical device that acts as a transfer point for data between endpoints of a
physical/logical connection. FRX4000s and FRX6000s are often referred to as nodes.
P
Packet
is a group of data and control signals transmitted as a composite whole across a
packet-switching network.
Packet Switching
is the breaking up of data into smaller pieces and the transmission of these pieces over
a network via X.25.