Modem Strings
Enabling & Disabling x2 and/or V.90 on USR Modems
Enabling & Disabling V.90 and/or K56FLEX on K56Flex modems
Speeds for Rockwell Chipset Modems
Strings for Dropped Connections
DUN not reporting the correct connection speed
Fundamental Strings
AT&F1 sets modem to hardware flow control template (factory settings)
AT&F
ATZ resets modem
ATX1\N3 turns off LAPM (not USR Sportsters)
\N5%C0 turns off compression
X1 or X0 to turn off dial-tone detection ("Blind Dial") and busy-signal detection on.
ATE1 turns local echo on (for use in Hyperterminal)
ATL3M3 turns on sound for all parts of connection and at maximum volume.
Enabling & Disabling x2 and/or V.90 on USR Modems
USR Sportster x2 only Modems:S32=32 disables x2
S32=34 disables x2 and enables V.8 mode
USR Courier x2 only Modems:
S58=1 disables x2
If these don't work you can try the following:
s15.7=1
&N16&U8
&N16
S32.5=1
USR Sportster V.90 & x2 Modems:
S32=66 enablex2, disable V.90
S32=34 disablex2, enable V.90
S32=98 disable x2 and v.90
S32=2 (or AT&F1) enable x2 and V.90
USR Courier V.Everything V.90 & x2 Modems:
S58=32 enablex2, disable V.90
S58=1disablex2, enable V.90
S58=33 disable x2 and v.90
S58=0 (or AT&F1) enable x2 and V.90
Enabling & Disabling V.90 and/or K56FLEX on K56Flex modems
For most Rockwell chips:
For those with firmware versions V2.065 and V2.076 enter AT&F&C1&D2W2 and tell them get a firmware upgrade.
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
For Rockwell HCF chips:
V.90 preferred (K56flex will still work) +MS=V90
K56flex preferred (V.90 will still work) +MS=K56FLEX
Disable V.90 and K56flex, use V.34 (28.8/33.6) +MS=V34
Lucent chipset modems:
For modems which do not support v90 add S38=0 to the string
For Apollo (LT Win Modem) and Mars (LT PCI Win Modem) chipsets:
Enable V.90: -V90=1
Disable V.90: -V90=0
See current V90 setting with explanation: -V90? (in a terminal)
Enable K56flex: S38=1
Disable K56flex: S38=0
For Venus chipsets (mostly used in external modems):
K56flex only (V.90 disabled): S109=0
K56flex or V.90: S109=1
V.90 only (K56Flex disabled): S109=2
Disable K56flex and V.90 (use V.34): S38=0
Multitech Modems
In late November 1997 we updated our modems in Dublin so they were capable of V.90 connections. In December we started getting calls from people with Multitech modems getting no connection. We discovered after awhile that the signal from their modem was too loud, so we got a string to lower it.
S20=8 is the standard setting
Try S20=10&E0
S20=12&E0
S20=14&E0&E0 can be put in if the person with the Multitech is having problems sending attachments only.
Motorola Bitsurfer ISDN
AT&F&C1&D2@B0=1%A2=95
ZyXEL TA ISDN Modems
ATS87.2=0
MWAVE Modem (combined modem and soundcard)
AT&F1
SSE1&C0
&K3 flow control??
%C0 disable V.42bis & MNP5 Compression
\N3 disable V.42
\N5 disable MNP 1-4For reducing maximum throughput:
S28=18 26,400bps
S28=17 24,000bps
S28=16 21,600bps
S28=15 19,200bps
HSP Modems
AT&F&C1&D2&K3V1W1S0=0
AT&F&C1&D2&K3W2
AT&F\N5\A1%C1%E0%N6S10=150
AT&F\N5\A1%C0%E0%N6S10=200
Speeds for Rockwell Chipset Modems
S37=6 2,400bps
S37=7 4,800bps
S37=8 7,200bps
S37=9 9,600bps
S37=11 14,400bps
S37=12 19,200bps
S37=15 28,800bps
S37=30 33,600bps
Rockwell RPI Modems
AT&F&C1&D2&Q6&K3 set to 9,600bps
\N3
\N5 disable LAPM - force MNP5
EuroViva Modems
AT&F1\N3
AT&F1\N5
Nokia 610 Mobile Phone
AT+CRLP=61,61,48,50
Strings for Dropped Connections
S10=50
S10=100
S10=100S25=200
DUN not reporting the correct connection speed
If DUN shows a connection speed of 57,600 (57.6k), 115,200 (115.2k), or 38,400 (38.4k), you are getting the port speed between your computer and modem, not the modem CONNECT rate.
With Windows 95/98/NT, a file with the .inf extension is used when you install your modem to define how Windows and Windows Programs interact with the modem.
For DUN to report the correct speed in all cases, every possible CONNECT message must be defined in the .inf file. In addition, some of the latest 56k modems with Rockwell chipsets (Zoom, and others) are shipped where the factory default gives a CONNECT of the port speed instead of the carrier rate.