User`s guide

Glossary
GL-4
7800-A2-GB26-80
May 1999
A high-speed connection-oriented packet switching WAN protocol using variable-length
frames.
The DLCI identifier contained within the frame relay packet.
The ability to route frame relay packets based on the source port and frame relay header
(DLCI). The header contains a DLCI identifier that distinguishes the port for which the data
is intended.
Fractional Timing 1. ANSI standard for DCLB tests.
High-Level Data Link Control. A communications protocol defined by the International
Standards Organization (ISO).
Internet Control Management Protocol. Internet protocol that allows for the generation of
error messages, tests packets, and informational messages related to IP.
One of a dial line device’s operational states that indicates an installed device is not
currently in use.
Internet Protocol. An open networking protocol used for Internet packet delivery.
A mode of managing a DSLAM chassis which is the opposite of IP conservative mode.
The DSLAM chassis, associated card and endpoints each require an unique IP address
that is visible to the NMS network.
A mode of managing a DSLAM chassis, associated card and endpoints where only one IP
address is visible to the NMS network.
Interworking Packet Concentrator. A device that concentrates traffic from multiple LANs
onto a high-speed WAN interface.
International Telecommunications Union. The telecommunications agency of the United
Nations, established to provide standardized communications procedures and practices.
Before March 1993 it was called CCITT.
A device that allows a serial device to be connected to a LAN.
A device operating on a private line where no dialing is necessary to make the connection.
A dial device can be configured to run on a leased line. A local leased line device can be
switched over to dial mode while attached to a leased line.
Line LoopBack. A test in which the received signal on the network interface is looped back
to the network without change.
Loss of Frame. Occurs when a DS1 terminal is unable to synchronize on the DS1 signal
for some interval.
Loss Of Frame Count. The number of LOFs declared.
Any test that verifies a device’s integrity by connecting the device’s output to the device’s
input, then checks the received signal for errors.
Loss of Signal. The T1 line condition where there are no pulses.
A condition indicating that the device is holding the dial line busy to prevent receiving calls.
Management Information Base. A database of managed objects used by SNMP to provide
network management information and device control.
Multiple Virtual Lines. A proprietary local loop access technology that permits several
services to concurrently and discretely use a single copper wire loop.
Network Access Module. It is a type of CCA that accesses or acts as an interface with the
network.
frame relay
frame relay header
frame relay switching
FT1
HDLC
ICMP
idle
IP
IP complex mode
IP conservative mode
IPC
ITU
LAN adapter
leased
LLB
LOF
LOFC
loopback test
LOS
make busy
MIB
MVL
NAM