Outdated Drivers
Can cause hardware related Errors. Check your PC Drivers now.


M o d u l a t i o n / C o m p r e s s i o n   C o n t r o l s
Non-v90 K56Flex/v90 AMR or USB K56Flex/v90
x2/v90 v90 Only Notes
C o m m o n   I n i t s / N o i s e / A r t i c l e s
Non-v90 K56Flex/v90 AMR or USB K56Flex/v90
x2/v90 v90 Only Notes


Non-v90 Modems
 Back to TOP		 Disable V.92 Disable V.92 & V.90 Disable V.44 Disable PCM Upstream Disable Modem On-Hold Limiting Connection Speed
Most V.92 Modems +MS=v90 +MS=v34 +DS44=0 +PIG=1 +PMH=1 N/A
USR V.92 Modems ATs32=128+PIG=1+PMH=1+PQC=3 (preferred) or AT+PIG=1+PMH=1+PQC=3 or s32=128 s32=98 (preferred) or ATs32=98+PIG=1+PMH=1+PQC=3 +PIG=1 +PMH=1 N/A
Lucent / Agere / LSI V.92 Modems +MS=v90 +MS=v34 +DCS=1,0 (preferred) or +DCS=0,0 (to also disable v.42) +PIG=1 +PMH=1 N/A
K56Flex/v90 Modems
 Back to TOP		 Disable K56Flex Disable V.90 Disable V.90 & K56Flex Disable V.42bis Show True Connect Speed Limiting Connection Speed
Lucent / Agere / LSI LT Winmodem (version 5.97 or lower) s38=0 -v90=0 s38=0-v90=0 \n2 W2 Limit
Lucent / Agere / LSI Venus s38=0 s109=0 s38=0s109=0 \n2 W2 N/A
Motorola SM56 (all models) *mm15 *mm13 *mm12 \n4 \V2 Limit
PCTel HSP (all models) n0s37=14 n0s37=13 n0s37=12 %C0 W2 Limit
Rockwell/Conexant ACF (driver ver 2.xx) +MS=12,0 +MS=56,0 +MS=11,0 &Q6 W2 Limit
Rockwell/Conexant ACF (1 MB ROM) +MS=11,0 +MS=11,0 +MS=11,0 &Q6 W2 Limit
Rockwell/Conexant HCF, ACF (driver ver 3.xx) & HSF(Soft56) +MS=V90,0 +MS=K56,0 +MS=V34,0 +ES=1,0,1; +mr=2 Limit
VIA Technologies +MS=v90,0 +MS=K56FLEX,0 +MS=v34,0 %C0 +ES=4,0,1 Limit
AMR or USB K56Flex/v90 Modems
 Back to TOP		 Disable K56Flex Disable V.90 Disable V.90 & K56Flex Disable V.42bis Show True Connect Speed Limiting Connection Speed
Smartlink AMR or USB +MS=90,0 +MS=56,0 +MS=34,0 /N5 &E0 Limit
STMicroelectronics / SGS-Thomson AMR or USB +MS=90,0 +MS=56,0 +MS=34,0 %C1 &E0 Limit
Rockwell/Conexant Riptide (HCF Based) +MS=V90,0 +MS=K56,0 +MS=V34,0 +ES=1,0,1; +mr=2 Limit
Rockwell/Conexant Chameleon (HSF Based) +MS=V90,0 +MS=K56,0 +MS=V34,0 +ES=1,0,1; +mr=2 Limit
x2/v90 Modems
 Back to TOP		 Disable x2 Disable V.90 Disable V.90 & x2 Disable V.42bis Show True Connect Speed Limiting Connection Speed
USR Sportster and Winmodem S32=34 S32=66(Sport) S32=64(Win) S32=98 S15=128 &a3 Limit
USR Courier S58=1 S58=32 S58=33 S27=32 &a3 Limit
Cirrus Logic 56XX +MS=V90,0 +MS=VX2,0 +MS=V34,0 "H0 W2 Limit
ESS Tech / Teledrive (x2/v90) +MS=17,0 +MS=12,0 +MS=11,0 \N5 W2 Limit
Non-USR Texas Instruments x2/v90 S32=32 S32=64 S32=128 &K0 &B0 Limit
Broadcom BCM S51=95 S32=66 S32=98 \N5 W2 N/A
v90 Only Modems
 Back to TOP		 No fallback protocol Disable V.90 No fallback protocol Disable V.42bis Show True Connect Speed Limiting Connection Speed
Lucent / Agere / LSI LT Winmodem (version 6.0 or higher) Only v90/v34.  No x2/flex  fallback +MS=v34,0 Only v90/v34.  No x2/flex  fallback N/A N/A N/A
ESS Tech / Teledrive (v90 only) Only v90/v34.  No x2/flex  fallback +MS=11,0 Only v90/v34.  No x2/flex  fallback \N5 W2 Limit
TOPIC Semiconductor Only v90/v34.  No x2/flex  fallback &U1 Only v90/v34.  No x2/flex  fallback \N3 W1 N/A


 Back to TOP 
NOTES ON MODULATION, COMPRESSION, AND SPEED LIMITATION:  These init strings are intended to either be used alone or added to Common Init Strings to force the modem to connect with a certain protocol.  Remember that it is always best to update drivers and get your phone line checked for noise, rather than relying on an init string.  One of the best ways to get connected to download your latest drivers is to force v34. Keep the following in mind:
1)Disabling the secondary protocol of a modem, such as x2 or K56Flex, can make for faster connection time and less modem retraining if v90 fails to negotiate. This is not usually a great way to help with connection issues, but it can in some instances.
2)Disabling compression will often slow things down on the web, however it can help to speed things up for gaming and clear up dropped connections with online games as gaming packets can not usually be compressed and compression can sometimes cause connection issues when playing online games due to this.
3)Using speed limitations can be used in several ways. The best way to use this is to slow down your normal connection speed a bit so that you get a more stable connection which can actually often result in data moving faster and less dropped connections. Another reason for using speed limitations is to force your modem to connect within a certain speed range. You may get failed connections doing this, but if you can normally get that speed after connecting/disconnecting/reconnecting/etc, then you can redial until you get within that range, thus getting that speed you are looking for alot faster.




Non-v90 Modems
 Back to TOP		 Common Init Stings Modem Type Help for Dropped Connections (SEE NOTE AT BOTTOM)  Line Noise Detection Modem Articles
All v92 Modems AT&F&C1&D2+MS=v90,0 Varies N/A N/A N/A
IBM MWave AT"H%C\NS28=18 Manufacturer Recalled Modem (See HERE) N/A N/A Techie Newsletter Article
K56Flex/v90 Modems
 Back to TOP		 Common Init Stings Modem Type Help for Dropped Connections (SEE NOTE AT BOTTOM)  Line Noise Detection Modem Articles
Lucent / Agere / LSI LT Winmodem (version 5.97 or lower) AT&FX-v90=1s38=0s28=1 Software Modem s10=200 Noise Checking with Ati11 Techie Newsletter Article
Lucent / Agere / LSI Venus AT&Fs109=2 Hardware Modem s10=200 AND/OR s25=100 Noise Checking with Ati11 N/A
Motorola SM56 AT&F*mm15 HSP Modem s10=200 Noise Checking with AT#UD Techie Newsletter Article
PCTel HSP AT&F&C1&D2&K3W1 HSP Modem s10=200 AND/OR s25=100 AND/OR (s91=6 OR s91=14) Noise Checking with AT%L and AT%Q Techie Newsletter Article
Rockwell/Conexant ACF (driver ver 2.xx) AT&F+MS=12 Hardware Modem s10=200 AND/OR s25=100 AND/OR (s91=8 OR s91=14) AND/OR (also can use s30=0 as it this register controls a built in inactivity timer) Noise Checking with AT#UG, AT%L, AT%Q, and AT&V1 Techie Newsletter Article
Rockwell/Conexant HCF, ACF (driver ver 3.xx) & HSF(Soft56) AT&F&C1&D2+MS=v90,0 HCF->Software Modem
HSF->HSP Modem
ACF->Hardware Modem
 s10=200 Noise Checking with AT#UG, AT%L, AT%Q, and AT&V1 Techie Newsletter Article
VIA Technologies AT&F&C1&D2+MS=v90,0 Unknown s10=200 N/A N/A
AMR or USB K56Flex/v90 Modems
 Back to TOP		 Common Init Stings Modem Type Help for Dropped Connections (SEE NOTE AT BOTTOM) Line Noise Detection Modem Articles
Smartlink AMR or USB AT&F&C1&D2+MS=90,0,32000,48000 HSP? Modems s10=200 Noise Checking with AT#UD N/A
STMicroelectronics / SGS-Thomson AMR or USB AT&F&C1&D2+MS=90,0,32000,48000 HSP? Modems s10=200 Noise Checking with AT#UD N/A
Rockwell/Conexant Riptide (HCF Based) +MS=v90,0,32000,48000 Software Modem s10=200 Noise Checking with AT#UG, AT%L, AT%Q, and AT&V1 N/A
Rockwell/Conexant Chameleon (HSF Based) +MS=v90,0,32000,48000 HSP Modem s10=200 Noise Checking with AT#UG, AT%L, AT%Q, and AT&V1 N/A
x2/v90 Modems
 Back to TOP		 Common Init Stings Modem Type Help for Dropped Connections (SEE NOTE AT BOTTOM)  Line Noise Detection Modem Articles
USRobotics Winmodem AT&FS13=64S32=34&K0 Software Modem s10=200 AND/OR s25=100 Noise Checking with Ati6 & Ati11 -OR- A/D Conversion Checking with Aty11 N/A
USRobotics Sportster (28.8 or x2 ONLY) SPIRAL OF DEATH: AT&F1S15=128 ORAT&F1&K0S15=128 Hardware Modem s10=200 AND/OR s25=100 Noise Checking with Ati6 & Ati11 -OR- A/D Conversion Checking with Aty11 N/A
USRobotics Courier AT&F&C1&D2s58=1 Hardware Modem s10=150 AND/OR s25=100 Noise Checking with Ati6 & Ati11 -OR- A/D Conversion Checking with Aty11 N/A
Cirrus Logic 56XX AT&F&C1&D2+MS=V90,0,0,48000 Software? Modem s10=200 AND/OR s25=100 AND/OR (s91=6 OR s91=14) N/A N/A
ESS Tech / Teledrive (x2/v90) AT&F&C1&D2+MS=V90,0,33333,48000 HSP Modem s10=200 AND/OR (s91=7 OR s91=14 ) N/A N/A
Non-USR Texas Instruments (x2/v90) AT&F&C1&D2s32=32 Varies s10=200 AND/OR s25=100 N/A N/A
Broadcom BCM AT&F&C1&D2s51=95 HSP Modem s10=200 Noise Checking with AT#UD N/A
v90 Only Modems
 Back to TOP		 Common Init Stings Modem Type Help for Dropped Connections (SEE NOTE AT BOTTOM) Line Noise Detection Modem Articles
Lucent / Agere / LSI LT Winmodem (version 6.0 or higher) AT&FX+MS=v90 Software Modem s10=200 Noise Checking with Ati11 Techie Newsletter Article
ESS Tech / Teledrive (v90 only) AT&F&C1&D2+MS=V90,0,33333,48000 HSP Modem s10=200 AND/OR (s91=7 OR s91=14) N/A N/A
TOPIC Semiconductor AT&F&C1&D2*i15 Hardware Modem s10=200 AND/OR s25=100 AND/OR s45=0 AND/OR s7=150 N/A N/A


 Back to TOP 
NOTES ON DROPPED CONNECTION HELP:  These init strings are intended to either be used alone or added to the "Common Init Strings" to help stop dropped connections.  Remember that it is always best to update drivers and get your phone line checked for noise, rather than relying on an init string.  The listed S-registers do the following:
1)s7 increases the connection completion timeout. The timer is started when the modem finishes dialing and is measured in seconds.
2)s10 increases the lost carrier hang up delay.
3)s25 increases the length of time that the modem will ignore the DTR signal before it takes actions specified by other portions of the init (usually follows the &Dn command, which is normally set to disconnect if the DTR signal is lost from detection).
4)s45 increases the length of time that the modem will wait until going into automatic standby mode. A value of 0 turns off standby mode completely.
5)s91 sets the transmit attenuation level in -dBm's for public switched telephone network transmissions (ie. over phone lines).




 
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