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# ZOOM TELEPHONICS, INC.
VFP 28.8
Card Type Fax, Modem (asynchronous)
Chip Set Unidentified
Maximum Data Rate 28.8Kbps
Maximum Fax Rate 14.4Kbps
Data Bus 8-bit ISA
Fax Class Unidentified
Data Modulation Protocol Unidentified
Fax Modulation Protocol Unidentified
Error Correction/Compression Unidentified
V2021
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| Line out | CN1 | Line in | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT ADDRESS/INTERRUPT SELECTION |
|------------------------------------------------------------|
| Setting | IRQ | JP1 | JP2 |
|--------------+-----+-------------------+-------------------|
| COM1 (3F8h) | 4 | Pins 3 & 5, 4 & 6 | Pins 1 & 3 closed |
| | | closed | |
|--------------+-----+-------------------+-------------------|
| COM2 (2F8h) | 3 | Pins 2 & 4, 3 & 5 | Pins 2 & 4 closed |
| | | closed | |
|--------------+-----+-------------------+-------------------|
| COM3 (3E8h) | 4 | Pins 4 & 6, 1 & 3 | Pins 1 & 3 closed |
| | | closed | |
|--------------+-----+-------------------+-------------------|
| í COM4 | 3 | Pins 1 & 3, 2 & 4 | Pins 2 & 4 closed |
| (2E8h) | | closed | |
+------------------------------------------------------------+
+-----------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|-----------------------------------|
| Note: Diagram not available. |
+-----------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| MNP - EXTENDED SERVICES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls V.42 LAPM to MNP10 conversion |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| -K0 | MNP extended services disabled |
|--------------+---------------------------------------------|
| í -K1 | MNP extended services enabled |
|--------------+---------------------------------------------|
| -K2 | MNP extended services enabled; suppress MNP |
| | extended services initiation on V.42 LAPM |
| | answer detection phase. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - FALLBACK |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] -Qn [cmds] |
|--------------+---------------------------------------------|
| Description: | Allows MNP10 to fall back to 2400bps |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| -Q0 | MNP10 at 2400bps disabled |
|--------------+---------------------------------------------|
| í -Q1 | MNP10 at 2400bps enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - LINK NEGOTIATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Hn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the speed at which MNP10 link |
| | negotiation will occur |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í *H0 | Link will be negotiated at highest possible |
| | speed |
|--------------+---------------------------------------------|
| *H1 | Link will be negotiated at 1200bps |
|--------------+---------------------------------------------|
| *H2 | Link will be negotiated at 4800bps |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MNP10 - POWER LEVEL ADJUST |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] )Mn [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls automatic transmit power level |
| | adjustment during MNP 10 link negotiation |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í )M0 | Power level adjustment disabled |
|--------------+---------------------------------------------|
| )M1 | Power level adjustment enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMISSION LEVEL - CELLULAR |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] @Mn [cmds] |
|--------------+---------------------------------------------|
| Default: | 26 |
|--------------+---------------------------------------------|
| Range: | 0,1,2-10,11-31 |
|--------------+---------------------------------------------|
| Unit: | -1dBm |
|--------------+---------------------------------------------|
| Description: | Sets the signal level for transmission |
| | while in cellular mode |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| í @M0 | -26 dBm |
|--------------+---------------------------------------------|
| @M1 | -30 dBm |
|--------------+---------------------------------------------|
| @M2-@M10 | -10 dBm |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.32 - COMPROMISE EQUALIZER |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] :En [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls V.32 compromise equalizer |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| :E0 | Equalizer disabled |
|--------------+---------------------------------------------|
| í :E1 | Equalizer enabled |