| 单词 | SDSL (Symmetric Digital Subscriber Line) |
| 释义 | SDSL (Symmetric Digital Subscriber Line) • Control: An eight-bit control field that identifies the type of frame being transmitted. An information frame is used for the transfer of messages, frame numbering of contiguous frames in a message, and so on. A supervisory frame is used for purposes such as to indicate a detected error in transmission, acknowledge that frames have been received without error, request the retransmission of specified frames, and order the transmitting device to cease transmission. • Data: A variable-length data field (aka payload or text field) that contains the data or request being transmitted.This field also can include a format identifier, logical channel group number, packet-type identifier, and packet sequence numbers. In total, the Information field can contain as many as seven blocks, each of which can contain as many as 512 octets of data, for a total of 4,096 octets. • Frame Check Sequence (FCS): This 16- or 32-bit field contains the CRC character sequence used to check the integrity of the transmitted address and control information, as well as the data. • Flag: A specific eight-bit pattern that alerts the receiving device to the end of transmission of the frame.The most commonly used flag character is 01111110 (7E in hexadecimal). Only one flag is needed between frames. See also binary notation, bit-oriented protocol, block, CRC, Data Link Layer, FDX, frame, HDLC, HDX, hexadecimal notation, OSI Reference Model, payload, point-to-multipoint circuit, point-to-point circuit, protocol, SNA, synchronous, and X.25. |
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