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# 3COM CORPORATION
IMPACT (3C872, 3C877)
Card Type ISDN TA, modem (asynchronous)
I/O Options Analog adapter (optional)
Chipset Unidentified
Maximum Data Rate 14.4Kbps
Maximum Fax Rate 14.4Kbps
Fax Class Unidentified
Data Modulation Bell 103A, 212A
Protocol
ITU-T V.21, V.22, V.22bis, V.23, V.32,
V.32bis
Fax Modulation Unidentified
Protocol
Error MNP5, MNP10, V.42, V.42bis, STAC
Correction/Compression
ISDN Transfer Rate 56Kbps x 2/64Kbps x 2
ISDN Protocol V.120, PPP
Switch Type 5ESS, DMS100, EWSD, NI-1
Data Bus Serial
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| ISDN interface | CN1 | Serial port | CN4 |
|----------------------------+---------+--------------+------|
| Analog adapter | CN2 | AC power in | CN5 |
|----------------------------+---------+--------------+------|
| Serial port | CN3 | Power switch | SW1 |
|------------------------------------------------------------|
| Note: CN2 may not be present on all models. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+--------+----------+----------------------------------|
| B2 | Green | On | Data call connected on B2 |
| | | | channel |
|-----+--------+----------+----------------------------------|
| B2 | Yellow | On | Voice call connected on B2 |
| | | | channel |
|-----+--------+----------+----------------------------------|
| B2 | Green | Blinking | TA is dialing data call on B2 |
| | | | channel |
|-----+--------+----------+----------------------------------|
| B2 | Yellow | Blinking | TA is dialing voice call on B2 |
| | | | channel |
|-----+--------+----------+----------------------------------|
| B2 | N/A | Off | B2 channel is not connected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) (CON'T) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-------+--------+----------+--------------------------------|
| B1 | Green | On | Data call connected on B1 |
| | | | channel |
|-------+--------+----------+--------------------------------|
| B1 | Yellow | On | Voice call connected on B1 |
| | | | channel |
|-------+--------+----------+--------------------------------|
| B1 | Green | Blinking | TA is dialing data call on B1 |
| | | | channel |
|-------+--------+----------+--------------------------------|
| B1 | Yellow | Blinking | TA is dialing voice call on B1 |
| | | | channel |
|-------+--------+----------+--------------------------------|
| B1 | N/A | Off | B1 channel is not connected |
|-------+--------+----------+--------------------------------|
| D | Yellow | On | Signal is not synchronized or |
| | | | ISDN line is not connected |
|-------+--------+----------+--------------------------------|
| D | Yellow | Blinking | Signal is synchronized but |
| | | | D-channel protocols not |
| | | | established |
|-------+--------+----------+--------------------------------|
| D | Yellow | Off | Signal is synchronized |
|-------+--------+----------+--------------------------------|
| TEST | Yellow | On | TA failed last test |
|-------+--------+----------+--------------------------------|
| TEST | Yellow | Blinking | TA is executing test |
|-------+--------+----------+--------------------------------|
| TEST | Yellow | Off | TA is not executing test |
|-------+--------+----------+--------------------------------|
| POWER | Yellow | On | Power is on |
|-------+--------+----------+--------------------------------|
| POWER | Yellow | Off | Power is off |
+------------------------------------------------------------+
+--------------------------------------------------------+
| SUPPORTED STANDARD COMMANDS |
|--------------------------------------------------------|
| Basic AT Commands |
|--------------------------------------------------------|
| +++, A/ |
|--------------------------------------------------------|
| A, B, E, H, L, M, O, V, X, Z |
|--------------------------------------------------------|
| &D, &F, &G, &V, &W |
|--------------------------------------------------------|
| Extended AT Commands |
|--------------------------------------------------------|
| \A, \B, \G, \L, \N, \Q, \T |
|--------------------------------------------------------|
| %E, %L, %Q |
|--------------------------------------------------------|
| Special AT Commands |
|--------------------------------------------------------|
| *H, -K, -Q |
|--------------------------------------------------------|
| S-Registers |
|--------------------------------------------------------|
| S0 |
|--------------------------------------------------------|
| Note: See MHI help file for complete information. |
+--------------------------------------------------------+
+------------------------------------------------------------+
| UNIDENTIFIED COMMANDS |
|------------------------------------------------------------|
| Command | Default |
|----------------------------+-------------------------------|
| S63 | Unidentified |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| CALL TYPE |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S61=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the type of call the TA will make. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í S61=0 | TA will dial according to dial modifiers. |
|--------------+---------------------------------------------|
| S61=2 | TA will place ISDN call. |
|--------------+---------------------------------------------|
| S61=3 | TA will place modem call. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] D<#>;[cmds] |
|--------------+---------------------------------------------|
| Description: | Dials the telephone number indicated |
| | according to any modifiers included in the |
| | string. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| D | Dial number indicated with ISDN adapter. |
|--------------+---------------------------------------------|
| DP | Dial number indicated in pulse dialing mode |
| | with modem. |
|--------------+---------------------------------------------|
| DT | Dial number indicated in tone dialing mode |
| | with modem. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PROTOCOL/SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Fn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects the protocol and speed the modem |
| | will attempt to connect at. |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| F0 | Auto-detect the highest common connect |
| | speed. |
|--------------+---------------------------------------------|
| F1 | Select V.21 or Bell 103 at 300bps speed. |
|--------------+---------------------------------------------|
| F3 | Select V.23 at 75/1200bps speed. |
|--------------+---------------------------------------------|
| F4 | Select V.22 or Bell 212A at 1200bps speed. |
|--------------+---------------------------------------------|
| F5 | Select V.22bis at 2400bps speed. |
|--------------+---------------------------------------------|
| F6 | Select V.32 or V.32bis at 4800bps speed. |
|--------------+---------------------------------------------|
| F7 | Select V.32bis at 7200bps speed. |
|--------------+---------------------------------------------|
| F8 | Select V.32bis or V.32 at 9600bps speed. |
|--------------+---------------------------------------------|
| F9 | Select V.32bis at 12Kbps speed. |
|--------------+---------------------------------------------|
| F10 | Select V.32bis at 14.4Kbps speed. |
+------------------------------------------------------------+
See 3COM CORPORATION IMPACT (3C871) for a full command summary.