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MT5634HD8/16 User Guide
26 CommPlete Communications Server
Error Correction and Data Compression Commands
You can configure a modem to any of three different V.42 modes of operation (each mode can be with or
without compression). They are the non-error correction, auto-reliable, and reliable modes. You can also
turn data compression on or off.
\Nn Error Correction Modes
n
= 0, 1, 2, 3, 4, 5, or 7
Default: \N3
Select the modem’s error correction mode using the \N command.
\N0 disables the modem’s V.42 error correction capabilities, and the modem functions as a non-error
correction modem, with data buffering. This is the same as &Q6, described earlier in this chapter.
\N1 causes the modem to function in direct mode.
\N2 enables reliable mode, in which the modem uses its V.42 error correction capabilities for all
transmissions. In reliable mode, the modem must be connected to a modem with the V.42 MNP protocol.
\N3 enables auto-reliable mode. During the handshaking procedures at the start of the online connection,
the modem queries whether the other modem is using V.42 error correction. If the modem determines
that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error
correction. If it determines that the other modem is not using V.42, the modem remains in non-error
correction mode. (This is the same as \N5 and \N7.)
\N4 enables reliable mode, in which the modem uses its V.42 error correction capabilities for all
transmissions. In reliable mode, the modem must be connected to a modem with a V.42 protocol (MNP or
LAP-M).
The V.42 standard includes MNP Class 3 and 4 and LAP-M error correction methods.
\N5 enables auto-reliable mode. During the handshaking procedures at the start of the online connection,
the modem queries whether the other modem is using V.42 error correction. If the modem determines
that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error
correction. If it determines that the other modem is not using V.42, the modem remains in non-error
correction mode. (This is the same as \N3 and \N7.)
\N7 enables auto-reliable mode. During the handshaking procedures at the start of the online connection,
the modem queries whether the other modem is using V.42 error correction. If the modem determines
that the other modem is using V.42, it switches itself into reliable (V.42) mode and enables error
correction. If it determines that the other modem is not using V.42, the modem remains in non-error
correction mode. (This is the same as \N3 and \N5.)
%Cn Data Compression
n
= 0 or 1
Default: %C1
The %C command allows you to disable data compression. Data compression is normally enabled.
%C0 disables V.42bis/MNP 5 data compression.
%C1 enables V.42bis/MNP 5 data compression.
- MT5634HD8/16 User Guide 1
- Revision Date Description 2
- A 11/15/97 Manual released 2
- FCC Fax Warning 4
- Canadian Limitations Notice 4
- Table of Contents 5
- 1 Introduction 7
- Manual Organization 8
- LED Indicators 9
- Power Supplies 9
- Technical Specifications 10
- 980 Hz mark 11
- 390 Hz mark 11
- 2 Installation 13
- Introduction 14
- Safety Warnings 14
- Pre-Installation Notes 15
- Installation Procedure 15
- Owner’s Manual 16
- 3 AT Commands 17
- Working with AT Commands 18
- Command Editing 19
- Dialing Commands 21
- Dial Modifier Commands 22
- V Switch to Speakerphone Mode 23
- W Wait for New Dial Tone 23
- , Dialing Pause 23
- ! Flash On-Hook 23
- Phone Number Memory Commands 24
- &Wn Store Configuration 25
- Zn Reset Modem 25
- Online Connection Commands 28
- Cn Carrier Control 29
- -Cn Data Calling Tone 29
- F Echo Online Data Characters 29
- &Gn Guard Tones 29
- RS-232 Interface Commands 30
- 3 AT Commands 31
- \Nn Error Correction Modes 32
- %Cn Data Compression 32
- Immediate Action Commands 33
- Flow Control Commands 33
- \Xn XON/XOFF Pass-Through 34
- Escape Sequences 35
- A Force Answer Mode 36
- On Go Back Online 36
- Diagnostic Commands 37
- Speaker Settings 37
- Mn Monitor Speaker Mode 38
- 4 S-Registers 39
- S-Registers 40
- S4 Line Feed Character 41
- S5 Backspace Character 41
- S6 Wait Time for Dial Tone 41
- S7 Time to Wait for Carrier 41
- S8 Pause Time for Comma 41
- S35 Data Calling Tone 43
- S37 Maximum Dial Line Rate 43
- Examples of Assigning Values 44
- Examples of Reading Values 45
- Appendices 47
- Dial Pulses 49
- Tone Dial Frequencies 49
- Multi-Tech Result Codes 51
- D S-Register Summary 53
- E AT Command Summary 55
- Glossary 63
- P/N 82074700 84
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