Cabletron Systems SFCS-200WG User Manual
Page 172
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GLOSSARY
OSI (Open Systems Interconnection)
- the 7-layer suite of protocols
designed by ISO committees to be the international standard computer net-
work architecture.
OSPF (Open Shortest Path First) Protocol
- a routing algorithm for IP that
incorporates least-cost, equal-cost, and load balancing.
Out-of-Band Management
- refers to switch configuration via the serial port
or over Ethernet, not ATM.
Packet Switching
- a communications paradigm in which packets (messages)
are individually routed between hosts with no previously established com-
munications path.
PBX (Private Branch Exchange)
- a private phone system (switch) that con-
nects to the public telephone network and offers in-house connectivity. To
reach an outside line, the user must dial a digit like 8 or 9.
PCI (Peripheral Component Interconnect)
- a local-bus standard created by
Intel.
PCM
(Pulse Code Modulation) - a modulation scheme that samples the
information signals and transmits a series of coded pulses to represent the
data.
PDN
(Public Data Network) - a network designed primarily for data trans-
mission and intended for sharing by many users from many organizations.
PDU (Protocol Data Unit)
- a unit of data specified in a layer protocol and
consisting of protocol control information and layer user data.
Peak Cell Rate
- at the PHY Layer SAP of a point-to-point VCC, the Peak Cell
Rate R
p
is the inverse of the minimum inter-arrival time T
0
of the request to
send an ATM-SDU.
Peer Entities
- entities within the same layer.
PHY (Physical Layer)
- the actual cards, wires, and/or fiber-optic cabling
used to connect computers, routers, and switches.