Annotated edit history of
FrameRelay version 1, including all changes.
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A [DTE]-[DCE] interface specification based on [LAPD] (Q.921), the Integrated Services Digital Network version of [LAPB] ([X.25] data link layer). A common specification was produced by a consortium of StrataCom, [Cisco], [Digital], and Northern Telecom. |
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FrameRelay is the result of wide area networking requirements for speed; [LAN]-[WAN] and [LAN]-[LAN] internetworking; "bursty" data communications; multiplicity of protocols and protocol transparency. These requirements can be met with technology such as optical fibre lines, allowing higher speeds and fewer transmission errors; intelligent network end devices (personal computers, workstations, and servers); standardisation and adoption of [ISDN] protocols. FrameRelay could connect dedicated lines and [X.25] to [ATM], SMDS, BISDN and other "fast packet" technologies. |
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FrameRelay uses the same basic data link layer framing and Frame Check Sequence so current [X.25] hardware still works. It adds addressing (a 10-bit Data Link Connection Identifier ([DLCI])) and a few control bits but does not include retransmissions, link establishment, windows or error recovery. It has none of [X.25]'s session layer but adds some simple interface management. Any network layer protocol can be used over the data link layer Frames. |
