Download BS ISO/IEC 13239:1997 Information technology — by BSI PDF

Read Online or Download BS ISO/IEC 13239:1997 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures PDF

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Extra resources for BS ISO/IEC 13239:1997 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures

Sample text

Frames with the S format control field shall not increment the send state variable at the transmitter or the receive state variable at the receiver. RR, RNR and REJ frames shall not contain an information field. SREJ frames may contain an information field for the purpose of identifying additional I frames in need of retransmission when the multi-selective reject procedure is selected. The encoding of the S format command/response control field shall be as shown in Figure 4a for modulo 8 numbering, in Figure 4b for modulo 128 numbering, in Figure 4c for modulo 32 768 numbering, and in Figure 4d for modulo 2 147 483 648 numbering.

I frames that may have been transmitted following the I frame(s) indicated by a SREJ frame shall not be retransmitted as the result of receiving a SREJ frame. Additional I frames awaiting initial transmission may be transmitted following the retransmission of the specific I frame(s) requested by all of the SREJ frames received. 3 Unnumbered format commands and responses Unnumbered, U, commands and responses shall be used to extend the number of data link control functions. Frames transmitted with the U format shall not increment the state variables at either the transmitting or the receiving data station.

Additional response frames may be transmitted following the frame which had the F bit set to “1”. Thus, in ARM and ABM, the F bit shall not be interpreted as the end of transmission by the secondary station or the combined station, respectively; it shall only be interpreted as indicating the response frame from the secondary/combined station sent as a reply to the previous command frame received with the P bit set to “1”. In ABM, if a combined station receives a command with the P bit set to “1”, transmission of a response with the F bit set to “1” shall take precedence over transmission of commands, with the exception of the mode setting commands (SABM or SABME or SM, SIM, DISC) and the reset (RSET) command.

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