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60 536EX Chipset Developer’s Manual
Intel Confidential
Error Correction and Data Compression
+DR=m 0
Data Compression Reporting: Controls whether the “+DR:” result code is transmitted from the DCE to
DTE once a connection with has been made. If enabled the result code displayed shall represent the
current negotiated DCE-DCE data compression type and is issued after the Error Control Report (+ER)
and before the final result code CONNECT. +DR accepts one numeric parameter decimal value and the
format is as follows:
0 Disables Data compression reporting—No +DR result code transmitted
1 Enables Data compression reporting—+DR result code transmitted
Display messages when +DR = 1,
+DR: NONE Data compression not in use
+DR: V42B V.42 bis is in use in both directions
+DR: V42B RD V.42 bis is in use in receive direction only
+DR: V42B TD V.42 bis is in use in transmit direction only
+DR: MNP5 MNP5 in use
+DS=m see ‘m’
Data Compression: This command sets multiple parameters for the control of data compression.
m = <direction>, <compression negotiation>, <max dict>, <max string> Default: m = 3, 0, 2048, 6
<direction> Specifies the direction of the data compression from the DTEs point of view.
Range: <direction> = 0–3
Default: <direction> = 3
<direction> = 0 Negotiated, no compression
<direction> = 1 Transmit only
<direction> = 2 Receive only
<direction> = 3* Both directions, accept any direction
<compression negotiation>Specifies whether the modem should stay connected or disconnect based
on the desired result.
Range: <compression negotiation> = 0, 1
Default: <compression negotiation> = 0
<compression negotiation> = 0* Do not disconnect
<compression negotiation> = 1 Disconnect
<max dictionary> Specifies the maximum number of dictionary entries that should be negotiated.
Range: <max dictionary> = 512 to 65535
Default: <max dictionary> = 2048
<max string> Specifies the maximum string length to be negotiated.
Range: <max string> = 6–250
Default: <max string> = 6
Table 21. V.44/V.42/V.42 bis and MNP Data Modem Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.