Intel MD566X - Manual (Page 70)

56K V.92 Data, Fax, and Voice Chipset
70 Intel Confidential Programmer’s Guide
-Jn 1
Set V.42 Detect Phase: In V.42 modes (\N3, \N4), this command specifies whether
the modem detects V.42, MNP, or no error-correcting protocols from the remote mo-
dem and changes to the appropriate mode. Otherwise, only V.42 is attempted.
n = 0, 1
n = 0 Disables the V.42 detect phase
n = 1* Enables the V.42 detect phase
"Hn 3
V.42 bis Compression Control: This command specifies whether the data in the
LAPM frames are compressed using V.42 bis data compression. This can improve
throughput by as much as 400%. Compression can be negotiated to operate in one
direction or both.
n = 0–3
n = 0 Disables V.42 bis
n = 1 Enables V.42 bis only when transmitting data
n = 2 Enables V.42 bis only when receiving data
n = 3* Enables V.42 bis for both transmitting and receiving data
"On 32
V.42 bis String Length: This command specifies the maximum number of charac-
ters that can be compressed into one V.42 bis code word. The default value of 32
optimizes throughput for most file types.
n = 6–250 Number of characters
n = 32* Usual number of characters
Table 4-2. V.44 / V.42 / V.42 bis and MNP Data Mode Command Descriptions