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# 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 MNP5, V.42, V.42bis
Correction/Compression
Fax Class Class I & II
Data Bus Serial
IMG IMG 1
+------------------------------------------------------------+
| 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.