Intel MD566X User Manual download pdf (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

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 129 130

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Intel MD566X User Manual Page 70