(TXT) View Source
# RACAL-DATACOM
VA-2450P, VA-2450S, VA-2450G, VA-2450K, VA-2455P, VA-2455S,
VA-2455G, VA-2455K
Card Type Modem (asynchronous)
Chip Set Unidentified
Maximum Data Rate 2400bps
Data Bus External
Data Modulation Protocol Unidentified
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| RS-232/422 | CN1 | Daughterboard | P4 |
| | | header | |
|--------------------------+---------+-----------------+-----|
| DC power | CN2 | Daughterboard | P5 |
| | | header | |
|--------------------------+---------+-----------------+-----|
| Line out | CN3 | Answer mode | SW3 |
| | | switch | |
|--------------------------+---------+-----------------+-----|
| Header to main modem | J4 | Loopback test | SW4 |
| board | | switch | |
|--------------------------+---------+-----------------+-----|
| Header to main modem | J5 | | |
| board | | | |
|------------------------------------------------------------|
| Note: Daughterboard included on VA-2455 models only. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|-----------------------------------------+-------+----------|
| Carrier receive level set at 0dBm to | SWA/1 | On |
| -35dBm (switched-line) | | |
|-----------------------------------------+-------+----------|
| Carrier receive level set at -10dBm to | SWA/1 | Off |
| -45dBm (leased-line) | | |
|-----------------------------------------+-------+----------|
| í Phase equalization disabled | SWA/2 | Off |
|-----------------------------------------+-------+----------|
| Phase equalization enabled | SWA/2 | On |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | SWA/3 | N/A |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | SWA/4 | N/A |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | SWB/1 | N/A |
|-----------------------------------------+-------+----------|
| í New synchronization pulse generation | SWB/2 | Off |
| disabled | | |
|-----------------------------------------+-------+----------|
| New synchronization pulse generation | SWB/2 | On |
| enabled | | |
|-----------------------------------------+-------+----------|
| í Modem uses internal clock source | SWB/3 | On |
|-----------------------------------------+-------+----------|
| Modem uses external clock source | SWB/3 | Off |
|-----------------------------------------+-------+----------|
| DTR normal | SWB/4 | Off |
|-----------------------------------------+-------+----------|
| DTR forced high | SWB/4 | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS (CON’T) |
|------------------------------------------------------------|
| Setting | Label | Position |
|-----------------------------------------+-------+----------|
| í Transmit clock separated from receive | SWB/5 | Off |
| clock | | |
|-----------------------------------------+-------+----------|
| Receive clock looped through to | SWB/5 | On |
| transmit clock | | |
|-----------------------------------------+-------+----------|
| í DSR forced low when modem is in test | SWB/6 | Off |
| mode | | |
|-----------------------------------------+-------+----------|
| DSR normal when modem is in test mode | SWB/6 | On |
|-----------------------------------------+-------+----------|
| í RTS normal | SWB/7 | Off |
|-----------------------------------------+-------+----------|
| RTS forced high | SWB/7 | On |
|-----------------------------------------+-------+----------|
| í 50ms delay from carrier signal to | SWC/1 | On |
| raise DCD | | |
|-----------------------------------------+-------+----------|
| 10ms delay from carrier signal to raise | SWC/1 | Off |
| DCD | | |
|-----------------------------------------+-------+----------|
| í 275ms delay from answer tone to RTS | SWC/2 | Off |
| disabled | | |
|-----------------------------------------+-------+----------|
| 275ms delay from answer tone to RTS | SWC/2 | On |
| enabled | | |
|-----------------------------------------+-------+----------|
| í 160ms delay from CTS to RTS | SWC/3 | On |
|-----------------------------------------+-------+----------|
| 7.1ms delay from CTS to RTS | SWC/3 | Off |
|-----------------------------------------+-------+----------|
| í Local echo disabled | SWC/4 | Off |
|-----------------------------------------+-------+----------|
| Local echo enabled | SWC/4 | On |
|-----------------------------------------+-------+----------|
| í 105ms transmit to receive delay | SWC/5 | On |
| enabled | | |
|-----------------------------------------+-------+----------|
| 105ms transmit to receive delay | SWC/5 | Off |
| disabled | | |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | SWC/6 | N/A |
|-----------------------------------------+-------+----------|
| í Modem will pick up the line only when | SWC/7 | Off |
| handset is off-hook | | |
|-----------------------------------------+-------+----------|
| Modem will pick up the line only when | SWC/7 | On |
| handset is on-hook | | |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JA | N/A |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JB | N/A |
|-----------------------------------------+-------+----------|
| Modem will disconnect on reversal of | JD | Open |
| line current | | |
|-----------------------------------------+-------+----------|
| Modem will not disconnect on reversal | JD | Closed |
| of line current | | |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JE | Open |
|-----------------------------------------+-------+----------|
| í Signal ground not connected to | JF | Open |
| chassis ground | | |
|-----------------------------------------+-------+----------|
| Signal ground connected to chassis | JF | Closed |
| ground | | |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JG | N/A |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JH | Open |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JI | N/A |
|-----------------------------------------+-------+----------|
| í Analog loopback and busy out controls | JJ | Closed |
| on pins 18 and 25 disabled | | |
|-----------------------------------------+-------+----------|
| Analog loopback and busy out controls | JJ | Open |
| on pins 18 and 25 enabled | | |
|-----------------------------------------+-------+----------|
| í Pin 18 or 25 controls busy out only | JK | Open |
|-----------------------------------------+-------+----------|
| Pin 18 or 25 controls analog loopback | JK | Closed |
| test and busy out | | |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JL | N/A |
|-----------------------------------------+-------+----------|
| í Receive clock follows transmit clock | JM | Open |
| when no carrier signal is present | | |
|-----------------------------------------+-------+----------|
| Receive clock forced high when no | JM | Closed |
| carrier signal is present | | |
|-----------------------------------------+-------+----------|
| í SW3 functions enabled | JP | Closed |
|-----------------------------------------+-------+----------|
| SW3 functions disabled | JP | Open |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JO | N/A |
|-----------------------------------------+-------+----------|
| í Factory configured - do not alter | JQ | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS (CON’T) |
|------------------------------------------------------------|
| Setting | Label | Position |
|---------------------------------------+--------+-----------|
| í CTS normal | JR | Open |
|---------------------------------------+--------+-----------|
| CTS follows RTS | JR | Closed |
|---------------------------------------+--------+-----------|
| í Auto-answer enabled | JS | Open |
|---------------------------------------+--------+-----------|
| Auto-answer disabled | JS | Closed |
|---------------------------------------+--------+-----------|
| Signal receive level set at | SW1B/1 | On |
| switched-line levels | | |
|---------------------------------------+--------+-----------|
| Signal receive level set at | SW1B/1 | Off |
| leased-line levels | | |
|---------------------------------------+--------+-----------|
| í Secondary channel transmission | SW1B/2 | Off |
| attenuation set to -5dBm | | |
|---------------------------------------+--------+-----------|
| Secondary channel transmission | SW1B/2 | On |
| attenuation set to 0dBm | | |
|---------------------------------------+--------+-----------|
| í Secondary channel local echo | SW1B/3 | On |
| disabled | | |
|---------------------------------------+--------+-----------|
| Secondary channel local echo enabled | SW1B/3 | Off |
|---------------------------------------+--------+-----------|
| í Secondary channel data rate set to | SW1B/4 | On |
| 150bps | | |
|---------------------------------------+--------+-----------|
| Secondary channel data rate set to | SW1B/4 | Off |
| 75bps | | |
|---------------------------------------+--------+-----------|
| í Analog loopback test and/or busy | W1 | Pins 2 & |
| out controlled by pin 25 | | 3 closed |
|---------------------------------------+--------+-----------|
| Analog loopback test and/or busy out | W1 | Pins 1 & |
| controlled by pin 18 | | 2 closed |
|---------------------------------------+--------+-----------|
| Hardware configuration is used | W2 | Pins 2 & |
| | | 3 closed |
|---------------------------------------+--------+-----------|
| Factory configuration is used | W2 | Pins 1 & |
| | | 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LINE TYPE |
|------------------------------------------------------------|
| Setting | JC | JN |
|--------------------+-------------------+-------------------|
| Switched line | Closed | Open |
|--------------------+-------------------+-------------------|
| 2-wire leased line | Closed | Closed |
|--------------------+-------------------+-------------------|
| 4-wire leased line | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMISSION LEVEL |
|------------------------------------------------------------|
| Setting | W3 |
|-------------------------------+----------------------------|
| Permissive (-10dBm) | Pins 1 & 2 closed |
|-------------------------------+----------------------------|
| Leased-line (0dBm) | Pins 2 & 3 closed |
|-------------------------------+----------------------------|
| Programmable | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|------+-------+----------+----------------------------------|
| TXD | Red | On | Modem is transmitting data |
|------+-------+----------+----------------------------------|
| TXD | Red | Off | Modem is not transmitting data |
|------+-------+----------+----------------------------------|
| RXD | Red | On | Modem is receiving data |
|------+-------+----------+----------------------------------|
| RXD | Red | Off | Modem is not receiving data |
|------+-------+----------+----------------------------------|
| RTS | Red | On | RTS signal is high |
|------+-------+----------+----------------------------------|
| RTS | Red | Off | RTS signal is low |
|------+-------+----------+----------------------------------|
| CTS | Red | On | CTS signal is high |
|------+-------+----------+----------------------------------|
| CTS | Red | Off | CTS signal is low |
|------+-------+----------+----------------------------------|
| DSR | Red | On | DSR signal is high |
|------+-------+----------+----------------------------------|
| DSR | Red | Off | DSR signal is low |
|------+-------+----------+----------------------------------|
| DTR | Red | On | DTR signal is high |
|------+-------+----------+----------------------------------|
| DTR | Red | Off | DTR signal is low |
|------+-------+----------+----------------------------------|
| RI | Red | Blinking | Phone is ringing |
|------+-------+----------+----------------------------------|
| RI | Red | Off | Phone is not ringing |
|------+-------+----------+----------------------------------|
| CXR | Red | On | Carrier signal detected |
|------+-------+----------+----------------------------------|
| CXR | Red | Off | Carrier signal not detected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| The -S and -P models are permissive and programmable |
| switched line modems, respectively. The -G and -K models |
| are 2-wire and 4-wire leased line modems, respectively. |
| The defaults for the jumpers reflect these differences |
| where applicable. |
+------------------------------------------------------------+