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Extra info for BS ISO/IEC 13239:1997 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures
2 Functions of the poll bit in NRM In NRM, the P bit shall be set to “1” to solicit response frames from the secondary station. The secondary station shall not transmit until it receives either a command frame with the P bit set to “1” or a UP command. The secondary station may send I frames upon receipt of an I frame with the P bit set to “1”, certain S frames (RR, REJ or SREJ) with the P bit set to “1”, a UI command with the P bit set to “1”, or a UP command with the P bit set to “1” or “0”. 3 Functions of the poll bit in ARM and ABM In ARM and ABM, the P bit set to “1” shall be used to solicit a response, at the earliest respond opportunity, with the F bit set to “1”.
The duration of this timer is not a subject of this International Standard. 2 Modes Three operational modes and three non-operational modes are defined. 1 Operational modes The three operational modes are: a) normal response mode (NRM); b) asynchronous response mode (ARM); and c) asynchronous balanced mode (ABM). 1 Normal response mode (NRM) In NRM, which is an unbalanced data link operational mode, the secondary station shall initiate transmission only as the result of receiving explicit permission to do so from the primary station.
5 Commands and responses The set of commands and responses is summarized in Table 6. 1 Information transfer format command and response The function of the information, I, command and response shall be to transfer sequentially numbered frames, each containing an information field, across a data link. The encoding of the I command/response control field shall be as shown in Figure 3a for modulo 8 numbering, in Figure 3b for modulo 128 numbering, in Figure 3c for modulo 32 768 numbering and in Figure 3d for modulo 2 147 483 648 numbering.
BS ISO/IEC 13239:1997 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures by BSI