Modem Initialization Strings
(These strings have been proven to work with ASCEND MAX & TNT Routers)
My Computer | DUN | Internet Junction Properties | Configure | Connection | Advanced | Extra Settings...
First, before you try any of the initialization strings below, it is advisable that you know what brand and model modem you have AND that you have the latest driver for your modem. Do not let Windows automatically install software for it. These Windows drivers are probably out of date. Use the software that came with the modem. Then go online to your modem's manufacturer web site and be sure you have the latest firmware revision. This is very important!
Second, we have found that for many nondescript modems (modems not mentioned on this page) and the diamond supramax modem, that using ATZ works well. If you are receiving the error "The computer you are dialing is not answering" or it is taking multiple times to connect, the ATZ string will work. So, if you have a modem not mentioned on this page, a Diamond SupraFax modem, or you can't find the name of your modem, try using ATZ.
The strings themselves are all case sensitive. All letters within the strings need to be in UPPER CASE, unless otherwise noted. Feel free to try as many as you like. Sometimes it takes trying a few to find the one that works best with your particular modem. If your modem is not on the list below, check out the other init. string links at the bottom of this page.
To add an initialization string to your modem, follow the instructions below.
- Double-click My Computer > Control Panel > Modems
- Hilight your modem and click Properties (NOT dialing properties)
- Click the Connection tab
- Click the Advanced button
- There is a field at the bottom called Extra Settings
Type in the initialization string on this line. Be sure to click OK at every screen. Then retry the connection.
For All Rockwell Chipset Based Modems, try the strings in this table first. |
CONNECTION |
INITIALIZATION STRING |
V.90 preferred (K56flex will still work) |
+MS=12,1 |
V.90 only, K56flex and V.34 disabled |
+MS=12,1,34667,56000 |
K56flex preferred (V.90 will still work) |
+MS=56,1 |
K56flex only, V.90 and V.34 disabled |
+MS=56,1,34000,56000 |
Disable V.90 and K56flex, use V.34 (28.8/33.6) |
+MS=11,1 +MS=11,0 +MS=V34 |
For 3COM/USR modems, try the strings in this table first. |
MODEM |
x2 off, V.90 on |
Both off |
Both on * |
Sportster ** (and all other USR modems) |
S32=34 |
S32=98 |
S32=2 |
Courier |
S58=1 |
S58=33 |
S58=0 |
* Using AT&F1 in the init. string automatically enables both protocols |
** Non-U.S. Robotics modems that use x2 generally respond to the same commands as the sportster |
For All Other Modems, try the strings in this table. |
MODEM |
INITIALIZATION STRING |
LT Win Modem |
-v90=0 (try this string first) S38=0 (Try lowering connect speed to 38,400) S38=0-v90=0 S38=0s109=0 |
HCF Modem |
+MS=K56,0 (try this string first) at&c1%c0x3 +MS=V90,0 +MS=V34 AT+ms=,,,,,41333 (Commas will limit connect speed to eliminate the agressive retrain problem) AT+ms=V34 (if above string does not work) |
PCTel HSP Modem |
n0s37=13 (forces a Kflex connection) n0s37=12 (forces a V.34 connection) |
V.90 Modems (generic) |
AT&F1&B1&D2&H1&I0&K1&M4S7=60 |
Viking V.90 Modems |
AT&FWZ+MS=12,1 +MS=11,1 |
All 56K Flex Modems (Also works with K56 K1FX SPC int. spkr. phone modem - use country code in DUN) |
AT&F&C1&D2&K3&W1 AT&F2&W2S202=32 &F2W2S202=32 |
3Com Sierra Modem |
AT&F |
3Com USR Win Modem |
S32=16 S25=10 S12=0 AT&F1&B1&D2&H1&I0&K1&M4S7=60 ATF&F1E0Q0V1&C1&D2S0=0ATS7=120S19=15L2&M4&K1&H1&R2&I0B0X4 AT&F1&C1 |
3Com Win Modem |
&FW |
56k USR Sportster |
S32=16 S25=10 S12=0 AT&F1&B1&D2&H1&I0&K1&M4S7=60 |
Cyrrus Logic 56K |
AT+MS=V34B,1,300 S32=16 S25=10 S12=0 AT&F1&B1&D2&H1&I0&K1&M4S7=60 |
All USR Sportster |
AT&H1&R2&I0 AT&FX4&B1&C1&D2&H1&K3&R2 S12=0 AT&F1&B1&D2&H1&I0&K1&M4S7=60 |
USR Sportster 28.8 Modem |
AT&FX4&A3&B1&D2&H1&I0&K1&M4S7=60 |
USR Sportster 28.8-33.6 Modem |
AT&F1&B1&D2&H1&I0&K1&M4S13=1S27=48 |
USR Sportster Voice 33.6 FAX |
AT&F&C1&D2&K1&H1S7=60 |
USR 33.6 Internal Non-voice |
AT&F1S0=0S7=90E1V&KO&I0S33=32 |
Zoom 56Kflex |
AT S202=32 AT&F1W2 AT&FW2S202=32 |
All Zoltrix Modems |
AT&F&C1&D2 |
Hayes Accura |
AT&F2&D2&C1 |
Viva Modem |
AT&F2&D2&C1 |
Lucent V90 Modem |
AT&FX&C1&D2S95=1(space)S11=50(space)S38=0-v90=0 |
GENERIC: Any Modem |
AT&F AT&F1 AT&F&C1&D2 AT&F1&C1&D2 ATZ AT&F&C1&D2 AT&F1 S15=128 |
GENERIC 28.8 - 33.6 |
AT&F&C1&D2S7=60 AT&F0&C1&D2&K3 AT&F1 AT&F1S27=32 AT&F1S32=16 AT&F1S33=32 AT&F1S27=32S33=32 |
MWave Modem |
AT&F&C1&D2S7=60 |
Aptiva 28.8 Dat/FAX |
AT&F&C1&D2S7=60 |
MAC Users |
AT&F1&D0S27=32 |
Aspen 33.6 Modem |
AT&FX4&C1&D2E1 |
Thunderlink Modem |
AT&F |
If your modem hangs up between 1-15 minutes (any modem) |
S15=128 S25=10 S12=0 |
If you have Personal Secretary as your anwering machine (any modem) |
ATS6=6 |
ISDN TERMINAL ADAPTER |
INITIALIZATION STRING |
Motorola Bit Surfer Pro (external) |
AT&F%A2=95%A4=0@B0=2 AT&F&C1&D2Q3%A2=95@B0=2 AT&F1&C1&D2@B0=2%A4=1 AT&F1W1&C1&D3@B0=1%A4=0%A2=95 |
3COM IMPACT |
ATS60=64S70=0S80=0 |
OTHER INIT. STRING & MODEM LINKS
Modem Help dot org - Excellent init. string resource
Ask Mr. Modem
More Modem Strings Here
A Juno Modem Config. Page
Disconnects, Slow Speeds and General Help
Everything You Wanted To Know About Modems...
Curt's High Speed Modem Page - Recommended!
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