3COM CORPORATION
SPORTSTER 56K VOICE FAXMODEM (EXTERNAL)
Card Type | Modem (asynchronous) |
Chipset | U.S. Robotics |
I/O Options | Voice, speakerphone, speaker out |
Maximum Data Rate | 56Kbps |
Maximum Fax Rate | 14.4Kbps |
Data Modulation | Bell 103A/212A ITU-T V.21, V.22, V.22bis, V.23, V.32, V.32bis, V.34 U.S. Robotics x2 |
Fax Modulation | ITU-T V.17, V.21CH2, V.27ter, V.29 |
Error Correction/Compression | MNP5, V.42, V.42bis |
Fax Class | Class I & II |
Data Bus | Serial |

CONNECTIONS | |||
Function | Label | Function | Label |
AC power in | CN1 | Serial port | CN5 |
Telephone line in | CN2 | Power switch | SW1 |
Telephone line out | CN3 | Volume | VR1 |
Speaker out | CN4 | ||
DIAGNOSTIC LED(S) | |||
LED | Color | Status | Condition |
AA | Unidentified | On | Auto-answer enabled |
AA | Unidentified | Off | Auto-answer disabled |
AA | Unidentified | Blinking | Phone is ringing |
CD | Unidentified | On | Carrier signal detected |
CD | Unidentified | Off | Carrier signal not detected |
CD | Unidentified | Blinking | Modem is retraining |
SD | Unidentified | On | Modem is transmitting data |
SD | Unidentified | Off | Modem is not transmitting data |
RD | Unidentified | On | Modem is receiving data |
RD | Unidentified | Off | Modem is not receiving data |
DIAGNOSTIC LED(S) (CON'T) | |||
LED | Color | Status | Condition |
TR | Unidentified | On | DTR signal is high |
TR | Unidentified | Off | DTR signal is low |
CS | Unidentified | On | CTS signal is high |
CS | Unidentified | Off | CTS signal is low |
ARQ/FAX | Unidentified | On | Modem is connected in error correction mode |
ARQ/FAX | Unidentified | Off | Modem is not connected in error correction mode |
ARQ/FAX | Unidentified | Blinking | Modem is connected in FAX mode or modem is retransmitting data due to errors |
Note: The locations of the LEDs are unidentified. | |||
MISCELLANEOUS TECHNICAL NOTES |
A front panel diagram is not available. |
SUPPORTED STANDARD COMMANDS |
Basic AT Commands |
+++, ‘comma’, A/ |
A, B, D, E, F, H, L, M, O, P, T, V, X, Z |
&C, &D, &F, &G, &P, &R, &S, &T, &W |
S-Registers |
S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S18, S25, S38 |
Note: See MHI help file for complete information. |
Proprietary AT Command Set
See U.S. ROBOTICS SPORTSTER 56K FAXMODEM (INTERNAL) for a full command summary.