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# RAD DATA COMMUNICATIONS
MTM-15
Modem Type Data (synchronous/asynchronous)
Maximum Data Rate 19.2Kbps
Data Bus External
Data Modulation Protocol Proprietary
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------+----------+-------------------------+----------|
| RS-232/422 | CN1 | Digital loopback switch | DIG |
|------------+----------+-------------------------+----------|
| DC power | CN2 | Local loopback switch | ANA |
|------------+----------+-------------------------+----------|
| Transmit | XMT | Remote digital loopback | REM |
| | | switch | |
|------------+----------+-------------------------+----------|
| Receive | RCV | Test switch | PATT |
|------------+----------+-------------------------+----------|
| Ground | GND | Reset | RESET |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ANALOG LOOPBACK |
|------------------------------------------------------------|
| Setting | JP3 |
|----------------------------+-------------------------------|
| Enabled | Pins 1 & 2 closed |
|----------------------------+-------------------------------|
| » Disabled | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ASYNCHRONOUS TO SYNCHRONOUS DEVIATION |
|------------------------------------------------------------|
| Setting | SW2/S4 |
|-------------------------------+----------------------------|
| » 12.5% | Off |
|-------------------------------+----------------------------|
| 25% | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BAUD RATE |
|------------------------------------------------------------|
| Setting | SW1 |
|-------------------------------+----------------------------|
| 1.2Kbps | 0 |
|-------------------------------+----------------------------|
| 2.4Kbps | 1 |
|-------------------------------+----------------------------|
| 4.8Kbps | 2 |
|-------------------------------+----------------------------|
| » 9.6Kbps | 3 |
|-------------------------------+----------------------------|
| 19.2Kbps | 4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT STOP |
|------------------------------------------------------------|
| Setting | SW2/S2 | SW2/S3 |
|--------------------+-------------------+-------------------|
| 8 bits | Off | Off |
|--------------------+-------------------+-------------------|
| 9 bits | Off | On |
|--------------------+-------------------+-------------------|
| » 10 bits | On | Off |
|--------------------+-------------------+-------------------|
| 11 bits | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CD SIGNAL |
|------------------------------------------------------------|
| Setting | JP2 Pin 1 & 2 | JP2 Pin 3 & 4 |
|--------------------+-------------------+-------------------|
| CD normal | Open | Closed |
|--------------------+-------------------+-------------------|
| » CD forced high | Closed | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CHASSIS TO SIGNAL GROUND |
|------------------------------------------------------------|
| Setting | JP5 Pin 1 & 2 | JP5 Pin 3 & 4 |
|-------------------+--------------------+-------------------|
| » Connected | Closed | Open |
|-------------------+--------------------+-------------------|
| Disconnected | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK SOURCE |
|------------------------------------------------------------|
| Setting | JP1/A | JP1/B | JP1/C |
|---------------+--------------+--------------+--------------|
| » Internal | Closed | Open | Open |
|---------------+--------------+--------------+--------------|
| External | Open | Closed | Open |
|---------------+--------------+--------------+--------------|
| Receive | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RECEIVE IMPEDANCE |
|------------------------------------------------------------|
| Setting | JP8 Pin 1 & 2 | JP8 Pin 3 & 4 |
|------------------+--------------------+--------------------|
| » 600 Ohms | Closed | Open |
|------------------+--------------------+--------------------|
| High | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REMOTE LOOPBACK |
|------------------------------------------------------------|
| Setting | JP4 |
|------------------------------+-----------------------------|
| SQ output | Pins 1 & 2 closed |
|------------------------------+-----------------------------|
| » Remote loopback | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYNCHRONOUS/ASYNCHRONOUS SELECTOR |
|------------------------------------------------------------|
| Setting | SW2/S1 |
|-------------------------------+----------------------------|
| » Synchronous | On |
|-------------------------------+----------------------------|
| Asynchronous | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMISSION LEVEL |
|------------------------------------------------------------|
| Setting | JP6/A | JP6/B | JP6/C | JP6/D | JP6/E |
|----------+---------+---------+---------+---------+---------|
| » 0dBm | Closed | Open | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| -3dBm | Open | Closed | Open | Open | Open |
|----------+---------+---------+---------+---------+---------|
| -6dBm | Open | Open | Closed | Open | Open |
|----------+---------+---------+---------+---------+---------|
| -9dBm | Open | Open | Open | Closed | Open |
|----------+---------+---------+---------+---------+---------|
| -12dBm | Open | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT IMPEDANCE |
|------------------------------------------------------------|
| Setting | JP7 Pin 1 & 2 | JP7 Pin 3 & 4 |
|------------------+--------------------+--------------------|
| » 600 Ohms | Closed | Open |
|------------------+--------------------+--------------------|
| Low | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|------+--------+----------+---------------------------------|
| PWR | Green | On | Power is on |
|------+--------+----------+---------------------------------|
| PWR | Green | Off | Power is off |
|------+--------+----------+---------------------------------|
| RTS | Yellow | On | Request to Send enabled |
|------+--------+----------+---------------------------------|
| RTS | Yellow | Off | Request to Send disabled |
|------+--------+----------+---------------------------------|
| TD | Yellow | On | Modem is transmitting steady |
| | | | SPACE |
|------+--------+----------+---------------------------------|
| TD | Yellow | Off | Modem is not transmitting data |
|------+--------+----------+---------------------------------|
| TD | Yellow | Blinking | Modem is transmitting data |
|------+--------+----------+---------------------------------|
| RD | Yellow | On | Modem is receiving steady SPACE |
|------+--------+----------+---------------------------------|
| RD | Yellow | Off | Modem is not receiving data |
|------+--------+----------+---------------------------------|
| RD | Yellow | Blinking | Modem is receiving data |
|------+--------+----------+---------------------------------|
| DCD | Yellow | On | Carrier signal detected |
|------+--------+----------+---------------------------------|
| DCD | Yellow | Off | Carrier signal not detected |
|------+--------+----------+---------------------------------|
| TEST | Red | On | Modem in test mode |
|------+--------+----------+---------------------------------|
| TEST | Red | Off | Modem not in test mode |
|------+--------+----------+---------------------------------|
| SQ | Yellow | On | Good line quality |
|------+--------+----------+---------------------------------|
| SQ | Yellow | Blinking | Poor line quality |
|------+--------+----------+---------------------------------|
| SQ | Yellow | Dim | PATT test failed |
+------------------------------------------------------------+