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Page iv
Contents
Introduction ....................................................................................................................................8
Installation ......................................................................................................................................9
Unpacking Your Hardware .....................................................................................................9
Additional Items You Need ......................................................................................................9
Hardware Overview.............................................................................................................10
Installation Summary ............................................................................................................. 11
Connecting the Cables ..........................................................................................................12
Driver Installation ...................................................................................................................13
...............................................................................................................................................13
Modem LED Display...............................................................................................................14
Front Panel Mode LEDs .........................................................................................................15
The AT Commands ................................................................................................................ 16
Selecting Speeds ..................................................................................................................22
Flow Control ..........................................................................................................................26
Configuring the Modem .........................................................................................................28
Error Correction ...........................................................................................................................29
Error Correction Protocols ....................................................................................................29
Security & Encryption..................................................................................................................34
Encryption .............................................................................................................................41
Synchronous Modes ...................................................................................................................49
Leased Line Operations .......................................................................................................53
Dumb Mode Operation .................................................................................................................56
The Option Switches ............................................................................................................62
V.25bis Operations ......................................................................................................................63
Distinctive Ring ............................................................................................................................71
Caller ID ........................................................................................................................................72
Call Logging ...........................................................................................................................75
Commands ...................................................................................................................................76
+++ Escape Sequence .........................................................................................................76
**** Remote Access Sequence ............................................................................................77
AT? Interactive Command Help .............................................................................................79
A/ Repeat Last Command .....................................................................................................80
ATA Answer..........................................................................................................................81
ATBn Select Communications Standard ...............................................................................82
ATD Dial .................................................................................................................................86
Dial Modifiers .........................................................................................................................87
ATE Echo ...............................................................................................................................92
ATH Hang Up .........................................................................................................................93
ATI Identity .............................................................................................................................94
ATL Speaker Volume Control ................................................................................................95
ATM Monitor ..........................................................................................................................96
ATO Return to On-line State..................................................................................................97
ATQ Quiet (Suppress Response Codes) .............................................................................99
ATR Set Terminal Speed ......................................................................................................100
ATSn? Display S Register Value ........................................................................................102
ATSn= Set S Register Value ...............................................................................................103
ATV Verbal Response Codes.............................................................................................104
ATW Connection Speed Information ...................................................................................105