The Major Attributes of FRAME RELAY & ATM

 
ATTRIBUTEFRAME RELAYATM
Application support?Asynchronous data NOT designed for voice.Asynchronous data, synchronous voice, Video, and data.
Connection mode?Connection-oriented
Connection-oriented
Congestion management?Yes, traffic tagging with discard eligibility, and possible traffic discard.Yes, traffic tagging with cell loss priority, and possible traffic discard.
Method of identifying traffic?Data link connection identified.Virtual path and virtual channel identifiers.
Private Virtual Circuits?
Yes
Yes
Switched Virtual Circuits?
Yes
Yes
Congestion notification technique?Backward and forward explicit congestion notifications.Congestion notifications in the Payload Type Identifier.
Traffic tagging?
Uses the discard eligibility bit.
Uses the cell loss priority bit.
LAN or WAN technology?
WAN based
Either
Packet Data Unit size?
Variable (PDU is a frame)
Fixed at 53 bytes (PDU is a cell)
Sequencing of traffic?
No
Cell header, no; for ATM Adaption Layer (AAL) payload, depends on the AAL type.
ACKs/NAKs retransmissions?
No
Only for signaling traffic on SVCs.

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Extracted from "Comparison of ATM and Frame Relay", Table 1-1, page 7, ATM Volume III by Uyless Black.

Prepared by Patrick Koehler
Date of Last Revision: 17 December 2001.