56K V.92 Data, Fax, and Voice Chipset
Programmer’s Guide Intel Confidential 71
+DS44=m3,0,0,471,972,140,140,1884,3768V.44 Data Compression: This command controls the V.44 data compression func-tion if provided in the DCE. It accepts the following subparam eters:
m=[<direction>[,<compression_negotiation>[,<capability>[,<max_codewords_tx>[,<m
ax_codewords_rx>[,<max_string_tx>[,<max_string_rx>[,<max_history_tx>[,<max_his
tory_rx>]]]]]]]]]
<direction>, which specifies the desired direction(s) of operation of the data compression
function; from the DTE point of view;
<compression_negotiation>, which specifies whether or not the DCE should continue to op-
erate if the desired result is not ob tained;
<capability>, which specifies the use of stream method, packet method, multi-
packet method;
<max_codewords_tx>, which specifies the maximum number of codewords which should be
negotiated in the transmit direction;
<max_codewords_rx>, which specifies the maximum number of codewords which should be
negotiated in the receive direction;
<max_string_tx>, which specifies the maximum string length to be negotiated in the transmit
direction;
<max_string_rx>, which specifies the maximum string length to be negotiated in the receive
direction;
<max_history_tx>, which specifies the maximum size of the history buffer to be negotiated
in the transmit direction;
<max_history_rx>, which specifies the maximum size of the history buffer to be negotiated
in the receive direction.
<direction>: (Default = 3)
m = 0 Negotiated ... no compression
m = 1 Transmit only
m = 2 Receive only
m = 3 Both directions, accept and direction
<compression negotiation>: (Default = 0)
m = 0 Do not disconnect if REC. V.44 is not negotiated by the remote DCE as
specified in <direction>. Alway set to 0.
<capability>: (Default = 0)
m = 0 Stream method
m = 1 Packet method
m = 2 Multi-pac ket method
<max_codewords_tx>: (Default = 471) 256 to 65536
<max_codewords_rx>: (Default = 942) 256 to 65536
<max_string_tx>: (Default = 140) 32 to 255
<max_string_rx>: (Default = 140) 32 to 255
<max_history_tx>: (Default = 1884) 512
<max_history_rx>: (Default = 3768) 512
Table 4-2. V.44 / V.42 / V.42 bis and MNP Data Mode Command Descriptions