Installing and Administering PPP
156 Appendix A
Modem Connections
Dial Up Modems
Common Modem Configurations
In the next section you will find some suggestions for Telebit modem
settings which have worked well during testing. The examples here show
the complete register settings for a Telebit T1600 and a description of the
settings. Following this information are some command strings that will
provide the proper register settings for Telebit's T1600, Qblazer and
T3000 modems. Most modems should provide equivalent settings.
Check your modem’s user guide for help in composing the command
string for similar settings.
Telebit Modem Settings
The following commands were used to configure settings for a trio of
Telebit modems:
T1600: at &f s0=1s7=120s48=1s51=6s58=2s59=15s61=0s63=2tq2x12&c1&d3&s1 &w
T3000: at &f9 s0=1s7=120s48=1s51=6s58=2s59=15s61=0s63=1tq2x12&c1&d3&s1 &w
Qblazer: at &f s0=1s7=120s48=1s51=6s58=2s59=15s61=0s63=2tq0x4&c1&d3&s1 &w
The commands produced the following list of settings for the Telebit
T1600. The list is the output from the command AT&V.
at&v
T1600 - Version LA1.00 -Active Configuration
a1 E1 L0 M0 Q2 T V1 X12 Y0
&C1 &D3 &G0 &J0 &L0 &Q0 &R3 &S1 &T4 &X0
S000:1 S001=0 S002=43 S003=13 S004=10 S005=8 S006=2 S007:120
S008=2 S009=6 S010=14 S011=70 S012=50 S018=0 S025=5 S026=1
S038=0 S041=0 S045=0 S046=0 S047=4 S048:1 S050=0 S051:6
S056=17 S057=19 S058:2 S059:15 S060=0 S061:0 S062=15 S063:2
S064=0 S068=255 S069=0 S090=0 S093=8 S094=1 S100=0 S102=0
S104=0 S105=1 S111=255 S112=1 S180=2 S181=1 S183=25 S190=1
S253=10 S254=255 S255=255 OK
The table below shows the features and S register values set by the
T1600 commands. Many of these settings, particularly the S registers,
only apply to Telebit modems. However, your own modem will likely
respond to a different command or register value in the same way the
T1600 does to these. Use your modem’s command set and register
semantics to set features like RTS/CTS hardware flow control. Refer to
the Dialers file for descriptions of several more modem configurations.