Cabletron Systems SmartSwitch 6000 User Manual page 409

P
Packet
Packet Switching
PAD
PDN
Physical DCE/DTE
Port
Protocol
PU
Public Data Network
PVC
Q
QLLC
Glossary
is a group of data and control signals transmitted as a composite whole across a
packet-switching network.
is the breaking up of data into smaller pieces and the transmission of these pieces over
a network via X.25.
stands for "packet assembler/disassembler," which allows a non-X.25 device to access
an FRX/FRM, by converting its protocol to the X.25 packet mode protocol, and vice
versa. FRX4000, FRX6000, and FRM support integral async, SNA, and BSC PADs.
stands for "public data network," which is a network operated by common carriers or
telecommunications administrations for the purpose of providing data transmission
capabilities to the public.
see "DCE" and "DTE."
is the entry or exit point for node traffic.
is an agreement on format, meaning, and relative timing of information exchanged
between two communications devices.
stands for "physical unit," which is an IBM referenced to any SNA host or terminal
device.
see "PDN."
stands for "permanent virtual circuit," which is a permanent logical connection
between two subscribers, analogous to a leased line. Transmission of packets on a
PVC needs no call setup or call clearing.
is "Qualified Logical Link Control," which is a method of encapsulating SNA traffic
for transmission over X.25.
Glossary-7