| 单词 | LAPF (Link Access Procedure for Frame Mode Services) |
| 释义 | LAPF (Link Access Procedure for Frame Mode Services) • Backward Explicit Congestion Notification (BECN) Pronounced beckon. A 1-bit field used by the network to advise devices of congestion in the direction opposite of the primary traffic flow. If the target FRAD responds to the originating FRAD in the backward direction, the BECN bit is set in a backward frame. If there is no data flowing in the backward direction, the frame relay network creates a frame in that direction, setting the BECN bit. If the originating FRAD is capable of reducing the frame rate of its transmissions, it is advised to do so on the indicated DLCI, as the network may discard frames once the notification is posted. • Discard Eligibility (DE): A 1-bit field indicating the eligibility of the frame for discard under conditions of network congestion.Theoretically, the user equipment sets the DE in consideration of the acceptability of the application to loss. Should the user equipment not set the DE, the network switches may do so on a random basis or when traffic exceeds subscribed levels (CIR). SDLC and real-time voice and video traffic demand high priority and do not tolerate loss, and so must not be marked DE. • Information Field: Contains user information, either in the form of payload data or internetwork control information. Although this field can be as much as 4,096 octets in length, it generally is restricted to a maximum size of 1,600 octets. • Frame Check Sequence (FCS): A two-octet cyclic redundancy check (CRC) field that provides error detection. See also carrier, CRC, Data Link Layer, DLCI, downstream, FRAD, frame, frame relay, FCS, HDLC, header, octet, OSI Reference Model, payload, protocol suite, real-time, SDLC, signaling and control, SNA, trailer, and VC. |
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