3COM CORPORATION
SPORTSTER VOICE 28.8 FAXMODEM (INTERNAL)
Card Type | Modem, Fax |
Chip Set | Unidentified |
I/O Options | Serial ports (2 RJ-11) |
Maximum Modem Rate | 28.8Kbps |
Maximum Fax Rate | 14.4Kbps |
Data Modulation Protocol | Bell 103A/212A V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 |
Fax Modulation Protocol | Unidentified |
Error Correction/Compression | MNP 2-4, MNP5, V.42, V.42bis |
Fax Class | Class I & II |
Data Bus | 8-bit ISA |
Card Size | Three-quarter length |

CONNECTIONS | ||||||
Function | Label | Function | Label | |||
RJ-11 connector | CN1 | RJ-11 connector | CN2 | |||
SERIAL PORT ADDRESS | |
Setting | JP1 |
COM1 (3F8h) | Pins 1 & 2, 3 & 4, 5 & 6 closed |
í COM2 (2F8h) | Pins 3 & 4, 5 & 6 closed |
COM3 (3E8h) | Pins 1 & 2, 5 & 6 closed |
COM4 (2E8h) | Pins 5 & 6 closed |
Plug & Play enabled | Open |
IRQ INTERRUPT | |
IRQ | JP2 |
IRQ2 | Pins 1 & 2 closed |
í IRQ3 | Pins 3 & 4 closed |
IRQ4 | Pins 5 & 6 closed |
IRQ5 | Pins 7 & 8 closed |
IRQ7 | Pins 9 & 10 closed |
Plug & Play enabled | Open |
SUPPORTED COMMAND SET |
Basic AT Commands |
AT, ‘+++’, ‘comma’, A/ |
A, B E, F, H, M, O, P, S, T, V, X |
&C, &D, &G, &T, &W, &Z |
S Registers |
S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S14, S18, S25, S38 |
Note: See MHI Help File for full command documentation. |
PROPRIETARY AT COMMAND SET
DIAL | |
Type: | Immediate |
Format: | AT [cmds] D<#> [cmds] |
Description: | Dials telephone number according to any modifiers included in the string |
Note: | Any combination of modifiers can be used to produce the desired dial functions in sequence. |
Command | Function |
DL | Re-dial last number |
DR | Answer mode enabled; originate mode disabled following handshake initiation. |
DP | Pulse dialing enabled |
DS=n | Dial stored telephone number n |
D#, * | Extended touch tone pads |
DT | Tone dialing enabled/Pulse dialing disabled |
D/ | Delays for 125ms before proceeding with dial string |
DW | Dialing resumed following dial tone detection |
D, | Dialing paused for amount of time specified in S8 register |
D! | Flash function initiated. Modem commanded to go off-hook for specified time before returning on-hook. |
D@ | Wait for Quite Answer function enabled. Modem waits until a "quiet answer," a ring-back signal followed by silence up to the time specified in S7, is received prior to executing the rest of the dial string. |
D$ | Displays a list of dial commands |
D; | Modem returned to idle state after dialing. The semicolon can only be placed at the end of the dial command. |
REPORT INFORMATION | |
Type: | Immediate |
Format: | AT [cmds] In [cmds] |
Description: | Displays information requested |
Command | Function |
I0 | Reports modem model and speed |
I1 | Reports ROM checksum |
I2 | Tests and reports RAM checksum |
I3 | Reports product type |
I4 | Reports current modem settings |
I5 | Reports nonvolatile memory (NVRAM) settings |
I6 | Reports link diagnostics |
I7 | Reports product confirmation |
I9 | Reports Plug & Play information |
I11 | Reports call statistics |
SPEAKER VOLUME | |
Type: | Configuration |
Format: | AT [cmds] Ln [cmds] |
Description: | Controls speaker volume |
Command | Function |
L0 | Low volume setting |
L1 | Low volume setting |
í L2 | Medium volume setting |
L3 | Highest volume setting |
RESULT CODES | |
Type: | Configuration |
Format: | AT [cmds] Qn [cmds] |
Description: | Enables modem to send result codes to the DTE |
Command | Function |
í Q0 | Result code sending enabled |
Q1 | Result code sending disabled |
Q2 | Result code sending only in Originate mode |
Q3 | Result code sending only in Ring mode |
LONG SPACE DISCONNECT | |
Type: | Configuration |
Format: | AT [cmds] Yn [cmds] |
Description: | Commands the modem to disconnect after a 1.6 second break is detected |
Command | Function |
í Y0 | Default is profile 0 setting |
Y1 | Default is profile 1 setting |
Y2 | Generic template (&F0) |
Y3 | Hardware flow control (&F1) |
Y4 | Software flow control (&F2) |
SOFT RESET | |
Type: | Immediate |
Format: | AT [cmds] Zn [cmds] |
Description: | Restores modem profiles previously saved in non-volatile RAM using the &W command. |
Command | Function |
Z0 | Restore setting selected by Y command |
Z1 | Restore setting 0 |
Z2 | Restore setting 1 |
Z3 | Restore to factory default profile 0 (&F0) |
Z4 | Restore to factory default profile 1 (&F1) |
Z5 | Restore to factory default profile 2 (&F2) |
AUTO-ANSWER - ORIGINATE/ANSWER | |
Type: | Configuration |
Format: | AT [cmds] &An [cmds] |
Description: | Selects originate or answer mode when in Auto-Answer mode |
Command | Function |
&A0 | ARQ result codes disabled |
&A1 | ARQ result codes enabled |
&A2 | V-modulation indicator added |
&A3 | Protocol indicators added |
SERIAL PORT RATE | |
Type: | Configuration |
Format: | AT [cmds] &Bn [cmds] |
Description: | Selects fixed or variable serial port rate |
Command | Function |
&B0 | Variable , follows connection rate |
í &B1 | Fixed serial port rate |
&B2 | Fixed in ARQ mode, variable in non-ARQ mode |
FACTORY DEFAULT PROFILE | |
Type: | Configuration |
Format: | AT [cmds] &F [cmds] |
Description: | Sets values in active profile to values found in the default profile |
Command | Function |
&F0 | Generic template |
&F1 | Hardware flow control template |
&F2 | Software flow control template |
TRANSMIT DATA FLOW CONTROL | |
Type: | Configuration |
Format: | AT [cmds] &H [cmds] |
Description: | Sets transmit data flow control |
Command | Function |
&H0 | Generic template |
í &H1 | Hardware flow control template |
&H2 | Software flow control template |
&H3 | Hardware and software flow control templates |
RECEIVE DATA SOFWARE FLOW CONTROL | |
Type: | Configuration |
Format: | AT [cmds] &I [cmds] |
Description: | Sets transmit data flow control |
Command | Function |
í &I0 | Software flow control |
&I1 | XON/XOFF signals to your modem and remote system |
&I2 | XON/XOFF signals to your modem only |
FLOW CONTROL | |
Type: | Configuration |
Format: | AT [cmds] &Kn [cmds] |
Description: | Enables flow control options |
Command | Function |
&K0 | Flow control disabled |
í &K1 | Auto enable/disable |
&K2 | XON/XOFF flow control enabled |
&K3 | MNP5 compression disabled |
COMMUNICATIONS MODE | |
Type: | Configuration |
Format: | AT [cmds] &Mn [cmds] |
Description: | Selects communications mode |
Command | Mode |
&M0 | Normal mode, error control disabled |
&M1 | Reserved |
&M2 | Reserved |
&M3 | Reserved |
í &M4 | Normal/ARQ |
&M5 | ARQ mode |
CONNECTION SPEED UPPER LIMIT | |
Type: | Configuration |
Format: | AT [cmds] &Nn [cmds] |
Description: | Sets required connection speed if &U is set to 0; otherwise, sets fastest allowed connection speed. |
Command | Function |
&N0 | No maximum connect speed. |
&N1 | Set maximum connect speed to 300bps. |
&N2 | Set maximum connect speed to 1200bps. |
&N3 | Set maximum connect speed to 2400bps. |
&N4 | Set maximum connect speed to 4800bps. |
&N5 | Set maximum connect speed to 7200bps. |
&N6 | Set maximum connect speed to 9600bps. |
&N7 | Set maximum connect speed to 12Kbps. |
&N8 | Set maximum connect speed to 14.4Kbps. |
&N9 | Set maximum connect speed to 16.8Kbps. |
&N10 | Set maximum connect speed to 19.2Kbps. |
&N11 | Set maximum connect speed to 21.6Kbps. |
&N12 | Set maximum connect speed to 24Kbps. |
&N13 | Set maximum connect speed to 26.4Kbps. |
&N14 | Set maximum connect speed to 28.8Kbps. |
&N15 | Set maximum connect speed to 31.2Kbps. |
&N16 | Set maximum connect speed to 33.6Kbps. |
PULSE DIALING RATIO | |
Type: | Configuration |
Format: | AT [cmds] &Pn [cmds] |
Description: | Selects pulse dial make/break ratio |
Command | Function |
í &P0 | 39/61ms at 10pps (North America) |
&P1 | 33/67ms at 10pps (Europe) |
RTS/CTS | |
Type: | Configuration |
Format: | AT [cmds] &Rn [cmds] |
Description: | Selects RTS/CTS options |
Command | Function |
&R0 | Reserved |
&R1 | Modem ignores RTS. |
&R2 | Received Data on computer only on RTS |
DATA SET READY (DSR) | |
Type: | Configuration |
Format: | AT [cmds] &Sn [cmds] |
Description: | Selects DSR options |
Command | Function |
&S0 | DSR forced high |
&S1 | DSR high only while modem is handshaking or connected |
CONNECTION SPEED LOWER LIMIT | |
Type: | Configuration |
Format: | AT [cmds] &Un [cmds] |
Description: | Sets slowest allowed connection speed if &N is set to 1 or higher. |
Command | Function |
í &U0 | No minimum connect speed. |
&U1 | Set minimum connect speed to 300bps. |
&U2 | Set minimum connect speed to 1200bps. |
&U3 | Set minimum connect speed to 2400bps. |
&U4 | Set minimum connect speed to 4800bps. |
&U5 | Set minimum connect speed to 7200bps. |
&U6 | Set minimum connect speed to 9600bps. |
&U7 | Set minimum connect speed to 12Kbps. |
&U8 | Set minimum connect speed to 14.4Kbps. |
&U9 | Set minimum connect speed to 16.8Kbps. |
&U10 | Set minimum connect speed to 19.2Kbps. |
&U11 | Set minimum connect speed to 21.6Kbps. |
&U12 | Set minimum connect speed to 24Kbps. |
&U13 | Set minimum connect speed to 26.4Kbps. |
&U14 | Set minimum connect speed to 28.8Kbps. |
&U15 | Set minimum connect speed to 31.2Kbps. |
&U16 | Set maximum connect speed to 33.6Kbps. |
RESTORE PROFILE ON POWER-UP | |
Type: | Configuration |
Format: | AT [cmds] &Yn [cmds] |
Description: | Restores a selected profile into the active profile on power-up (hard reset) |
Command | Function |
&Y0 | Destructive, doesn’t send break |
&Y1 | Destructive, expedited |
&Y2 | Nondestructive, expedited |
&Y3 | Reserved |
S(STATUS) -REGISTERS
BIT-MAPPED REGISTER S13 | ||
Format: | AT [cmds] S13=n [cmds] | |
Range: | 0-174 | |
Unit: | Bit-mapped | |
Description: | Controls reset, dial mode | |
Bit | Value | Function |
0 | 0 1 | Unidentified Resets when DTR drops |
1 | 0 í 1 | Unidentified Resets non-MNP transmit buffer from 1.5K to 128bytes |
2 | 0 1 | Unidentified Sets backspace key to delete |
3 | 0 1 | Unidentified On DTR signal, auto dials number stared at NVRAM position 0 |
4 | 0 1 | Unidentified At power on/reset, auto dials number stared at NVRAM position 0 |
5 | 0 | Reserved |
6 | 0 | Reserved |
7 | 0 1 | Unidentified Disconnect on escape code |
BIT-MAPPED REGISTER S15 | ||
Format: | AT [cmds] S15=n [cmds] | |
Unit: | Bit-mapped | |
Description: | Disable/Enable MNP | |
Bit | Value | Function |
0 | 0 1 | Enable ARQ/MNP for V.22 Disable ARQ/MNP for V.22 |
1 | 0 1 | Enable ARQ/MNP for V.22bis Disable ARQ/MNP for V.22bis |
2 | 0 1 | Enable ARQ/MNP for V.32/V.32bis/V.32terbo Enable ARQ/MNP for V.32/V.32bis/V.32terbo |
3 | 0 1 | Enable MNP handshake Disable MNP handshake |
4 | 0 1 | Enable MNP level 4 Disable MNP level 4 |
5 | 0 1 | Enable MNP level 3 Disable MNP level 3 |
6 | 0 1 | MNP compatibility MNP incompatibility |
7 | 0 1 | Enable V.42 operation Disable V.42 operation |
TEST MODES | ||
Type: | Register | |
Format: | AT [cmds] S16=n [cmds] | |
Unit: | Bit-mapped | |
Description: | Controls touch tone dialing test. | |
Bit | Value | Function |
0 | 0 | Reserved |
1 | 0 1 | Touch tone dialing test not in progress Touch tone dialing test in progress |
2-7 | 0 | Reserved |
INACTIVITY TIMER | |
Type: | Register |
Format | AT [cmds] S19=n [cmds] |
Range: | 0-255 |
Unit: | 1 minute |
Description: | Maximum duration of DTE and DCE inactivity allowed prior to initiating hang-up process. |
Note: S19=0 disables the timer and allows indefinite inactivity. | |
BREAK LENGTH | |
Type: | Register |
Format | AT [cmds] S21=n [cmds] |
Unit: | 10ms |
Description: | Sets duration of breaks sent from the modem to the computer |
Note: Applies to MNP or V.42 mode only. | |
FLOW CONTROL CHARACTER - XON | |
Type: | Register |
Format: | AT [cmds] S22=n [cmds] |
Range: | 0-255 |
Unit: | ASCII |
Description: | Sets the character used to represent XON |
FLOW CONTROL CHARACTER - XOFF | |
Type: | Register |
Format: | AT [cmds] S23=n [cmds] |
Range: | 0-255 |
Unit: | ASCII |
Description: | Sets the character used to represent XOFF |
BIT-MAPPED REGISTER S27 | ||
Format | AT [cmds] S27=n [cmds] | |
Range: | 0-255 | |
Unit: | Bit-mapped | |
Description: | Enables/disables modulation protocols | |
Bit | Value | Function |
0 | 0 1 | Disable ITU-T modulation at 300bps for overseas calls: in V.21 mode, the modem answers both overseas and domestic calls, but only originates V.21 calls Enable ITU-T modulation at 300bps for overseas calls: in V.21 mode, the modem answers both overseas and domestic calls, but only originates V.21 calls |
1 | 0 1 | Disable unencoded modulation in V.32 mode Enable unencoded modulation in V.32 mode |
2 | 0 1 | Enable V.32 modulation Disable V.32 modulation |
3 | 0 1 | Enable 2100Hz answer tone Disable 2100Hz answer tone |
4 | 0 1 | Disable V.23 fallback mode Enable V.23 fallback mode |
5 | 0 1 | Enable V.32bis mode Disable V.32bis mode |
6 | 0 1 | Enable V.42 selective reject Disable V.42 selective reject |
7 | 0 1 | Enable codes Disable codes and displays 900 code instead |
CONNECTION TIME | |
Type: | Register |
Format | AT [cmds] S28=n [cmds] |
Range: | 0-255 |
Unit: | .01 second |
Description: | Sets V.32 duration |
Command | Function |
S28=0 | Eliminates the V.32 answer tone for a faster connection |
S28=8 | Times are in .1 second |
S328=255 | Disable connections except V.32 at 9600bps |
FALLBACK TIMER | |
Type: | Register |
Format | AT [cmds] S29=n [cmds] |
Range: | 0-255 |
Unit: | .01 second |
Description: | Sets the duration of the V.21 answer mode fallback timer |
VOLUME CONTROL | |
Type: | Register |
Format | AT [cmds] S31=n [cmds] |
Range: | 0-255 |
Description: | Sets volume control for speakerphone |
BIT-MAPPED REGISTER S32 | |||
Format: | AT [cmds] S32=n [cmds] | ||
Range: | 0-255 | ||
Description: | Select setup for 28.8 and higher speed modems | ||
Bit | Value | Function | |
0 | 0 1 | Disable V.8 call indicate Enable V.8 call indicate | |
1 | 0 1 | Disable V.8 mode Enable V.8 mode | |
2 | 0 1 | Enable V.FC modulation Disable V.FC modulation | |
3 | 0 1 | Enable V.34 modulation Disable V.34 modulation | |
4 | 0 1 | Enable 33.6kbps modulation Disable 33.6kbps modulation | |
5-6 | 0 1 | Reserved | |
BIT-MAPPED REGISTER S33 | |||
Format: | AT [cmds] S33=n [cmds] | ||
Range: | 0-255 | ||
Description: | Disable/enable data rates | ||
Bit | Value | Function | |
0 | 0 1 | Enable 2400 symbol rate Disable 2400 symbol rate | |
1 | 0 1 | Enable 2743 symbol rate Disable 2743 symbol rate | |
2 | 0 | Enable 2800 symbol rate Disable 2800 symbol rate | |
3 | 0 1 | Enable 3000 symbol rate Disable 3000 symbol rate | |
4 | 0 1 | Enable 3200 symbol rate Disable 3200 symbol rate | |
5 | 0 1 | Enable 3429 symbol rate Disable 3429 symbol rate | |
6 | 0 | Reserved | |
7 | 0 1 | Enable shaping Disable shaping | |
BIT-MAPPED REGISTER S34 | |||
Format: | AT [cmds] S34=n [cmds] | ||
Range: | 0-255 | ||
Description: | Disable/enable trellis encoding | ||
Bit | Value | Function | |
0 | 0 1 | Enable 8S-2D trellis encoding Disable 8S-2D trellis encoding | |
1 | 0 1 | Enable 16S-4D trellis encoding Disable 16S-4D trellis encoding | |
2 | 0 1 | Enable 32S-2D trellis encoding Disable 32S-2D trellis encoding | |
3 | 0 1 | Enable 64S-4D trellis encoding Disable 64S-4D trellis encoding | |
4 | 0 1 | Enable non-linear coding Disable non-linear coding | |
5 | 0 1 | Enable TX level deviation Disable TX level deviation | |
6 | 0 1 | Enable pre-emphasis Disable pre-emphasis | |
7 | 0 1 | Enable pre-coding Disable pre-coding | |