User manual US ROBOTICS 56 K SOFTMODEM COMMAND REFERENCE REV 1

[. . . ] 56K Softmodem Command Reference R46. 2021. 00 rev 1 4/10 56K Softmodem Command Reference Contents Introduction . Sample S2--Escape Character Other Document Conventions . B<value>--Communication Standard Setting . O<value>--Return to On-Line Data Mode . [. . . ] Their default values are 4096 and 32, respectively. Table 3-63: +DS Extended Syntax Commands Command +DS=<direction>, <0>, <max_dict>, <max_string> +DS?+DS=? Description Configures modem V. 42 compression method. Displays the current V. 42 compression configuration. Displays the supported V. 42 compression setting. +DS44=<direction>, <compression_negotiation>, <capability>, <max_codewords_tx>, <max_codewords_rx>, <max_string_tx>, <max_string_rx>, <max_history_tx>, <m ax_history_rx>-- V. 44 Data Compression Use this command to configure the V. 44 data compression method used by the modem. The 56K Softmodem never disconnects if V. 44 is not negotiated and always use the streaming method for data transfers. As a result, <compression_negotiation> and <capability> are always 0. +DS44=<direction>, <compression_negotiation>, <capability>, <max_codewords_tx>, <max_codewords_rx>, <max_string_tx>, <max_string_rx>, <max_history_tx>, <m ax_history_rx> Result codes: OK if <direction> = 0--3, and <compression_negotiation> = 0, and <capability> = 0, and <max_codewords_tx> = 512, 1024, 2048, and <max_codewords_rx> = 512, 1024, 2048, and <max_history_tx> = 1024, 2048, 4096, 1536, 3072, 6144, and <max_history_rx> = 1024, 2048, 4096, 1536, 3072, 6144. ERROR if <direction> does not equal 0--3, or <compression_negotiation> does not equal 0, or <capability> does not equal 0, or <max_codewords_tx> does not - 38 56K Softmodem Command Reference equal 512, 1024, 2048, or <max_codewords_rx> does not equal 512, 1024, 2048, or <max_history_tx> does not equal 1024, 2048, 4096, 1536, 3072, 6144, or <max_history_rx> does not equal 1024, 2048, 4096, 1536, 3072, 6144. The <direction> parameter sets which directions use the compression method. The 56K Softmodem uses compression in one or both directions. Table 3-64: Valid <direction> Values Value 0 1 2 3 Meaning Modem negotiates no V. 44 compression. Modem negotiates transmit only V. 44 compression. Modem negotiates receive only V. 44 decompression. Modem accepts compression in both or either direction (default). The <max_codewords_tx> parameter specifies the maximum number of code words to negotiate in the transmit direction. The <max_codewords_rx> parameter specifies the maximum number of code words to negotiate in the receive direction. Table 3-65: Valid <max_codewords_tx> and <max_codewords_rx> Values Value 2048 512, 1024, 2048 Meaning Default <max_codewords_tx> and <max_codewords_rx> value. Valid transmit and receive code word settings. The <max_string_tx> parameter specifies the maximum string length to negotiate in the transmit direction. The <max_string_rx> parameter specifies the maximum string length to negotiate in the receive direction. Table 3-66: Valid <max_string_tx> and <max_string_rx> Values Value 255 32--255 Meaning Default <max_string_tx> and <max_string_rx> value. Valid transmit and receive string lengths. +DS44=<direction>, <compression_negotiation>, <capability>, <max_codewords_tx>, <max_codewords_rx>, <max_string_tx>, <max_string_rx>, <max_history_tx>, <m ax_history_rx>-- The <max_history_tx> parameter specifies the maximum length of the history buffer to negotiate in the transmit direction. The <max_history_rx> parameter specifies the maximum length of the history buffer to negotiate in the receive direction. - 39 56K Softmodem Command Reference Table 3-67: Valid <max_history_tx> and <max_history_rx> Values Value 6144 1024, 2048, 4096, 1536, 3072, 6144 Meaning Default <max_history_tx> and <max_history_rx> value. [. . . ] LAPM, MNP, or asynchronous. S48 = 128 Do not use. MNP or asynchronous. S54--Blind Dialing Delay When bit 7 of S53 is set, this register controls the length of time (in seconds) that the modem will wait before starting to dial after going off-hook when blind dialing. This register is used for the countries where the wait for dial tone delay (S6) can be set differently from blind dialing delay. S91--Data Transmit Level Register S91 specifies the line transmit level in dBm with an implied minus sign. [. . . ]