
Appendix D. Glossary
61200214L1-20 IQ Probe User Manual D-9
ping
An internet protocol standard that provides loopback on demand for
any device in an IP network. One device "pings" another by sending
a loopback request to the device's IP address.
point-to-point
Type of communications link that connects a single device to another
single device, such as a remote terminal to a host computer.
PVC
Permanent virtual circuit. A frame relay logical link, whose end-
points and class of service are defined by network management.
Analogous to an X.25 permanent virtual circuit, a PVC consists of the
originating frame relay network element address, originating data
link control identifier, terminating frame relay network element
address, and termination data link control identifier. Originating
refers to the access interface from which the PVC is initiated. Termi-
nating refers to the access interface at which the PVC stops. Many
data network customers require a PVC between two points. Data ter-
minating equipment with a need for continuous communion use
PVCs. See also DLCI.
remote configuration
A feature designed into ADTRAN products that allows remote units
to be configured from a local unit or VT-100 compatible terminal.
router
A device that supports LAN-to-LAN communications. Routers may
be equipped to provide frame relay support to the LAN devices they
serve. A frame-relay-capable router encapsulates LAN frames into
frame relay frames and feeds those frame relay frames to a frame
relay switch for transmission across the network. A frame-relay-
capable router also receives frame relay frames from the network,
strips the frame relay frame off of each frame to produce the original
LAN frame, and passes the LAN frame on to the end device. Routers
connect multiple LAN segments to each other or to a WAN. Routers
route traffic on the Level 3 LAN protocol (e.g., the internet protocol
address). See also bridge.
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