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Cajun P550/P880 ATM Uplink User Guide, Version 1.1
G-9
Protocol Data Unit
(PDU)
A discrete piece of information (such as a packet or frame) in the
appropriate format to be segmented and encapsulated in the payload
of an ATM cell.
Protocol Type A field in an Ethernet frame that specifies the network-layer
protocol being used in the frame.
Quality of Service
(QoS) Classes
Consists of the following five broad categories outlined by the ATM
Forum:
■ Class 1 specifies performance requirements and indicates tha
ATM’s quality of service should be comparable with the
service offered by standard digital connections.
■ Class 2 specifies necessary service levels for packetized video
and voice.
■ Class 3 defines requirements for inter-operability with other
connection-oriented protocols, particularly Frame Relay
■ Class 4 specifies inter-operability requirements for
connectionless protocols, including IP, IPX, and SMDS
(Switched Multimegabit Data Service).
■ Class 5 is effectively a “best effort” attempt at delivery; it is
intended for applications that do not require a particular class
of service.
Reverse Address
Resolution
Protocol (RARP)
A protocol defined by RFC 903 that allows an endstation to acquire
its IP address from a server attached to the local segment.
RFC (Remote
Function Call)
An API (application program interface) is the specific method
prescribed by a computer operating system or by another application
program by which a programmer writing an application program
can make requests of the operating system or another application.
RFC (Request For
Comments)
An RFC (Request for Comments) is an Internet formal document or
standard that is the result of committee drafting and subsequent
review by interested parties. Some RFCs are informational in
nature. Of those that are intended to become Internet standards, the
final version of the RFC becomes the standard and no further
comments or changes are permitted. Change can occur, however,
through subsequent RFCs that supersede or elaborate on all or part
of previous RFCs.