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# MULTI-TECH SYSTEMS, INC.
MT64DSU
Card Type CSU/DSU
Chip Set Unidentified
Maximum Data Rate 64Kbps
Data Bus External
Data Modulation Protocol B8RZ
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|------------------------------------------------------------|
| DC power | CN1 | Line out | CN4 |
|---------------------------+----------+--------------+------|
| RS-232/422 | CN2 | Power switch | SW3 |
|---------------------------+----------+--------------+------|
| V.35 | CN3 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+--------+----------|
| í CSU/DSU will operate in synchronous | SW1/5 | On |
| mode | | |
|----------------------------------------+--------+----------|
| CSU/DSU will operate in asynchronous | SW1/5 | Off |
| mode | | |
|----------------------------------------+--------+----------|
| í RTS signal forced high | SW1/6 | On |
|----------------------------------------+--------+----------|
| RTS signal normal | SW1/6 | Off |
|----------------------------------------+--------+----------|
| í DSR signal forced high | SW1/7 | On |
|----------------------------------------+--------+----------|
| DSR signal normal | SW1/7 | Off |
|----------------------------------------+--------+----------|
| í Local loopback test disabled | SW1/8 | On |
|----------------------------------------+--------+----------|
| Local loopback test enabled | SW1/8 | Off |
|----------------------------------------+--------+----------|
| í Digital loopback test disabled | SW1/9 | On |
|----------------------------------------+--------+----------|
| Digital loopback test enabled | SW1/9 | Off |
|----------------------------------------+--------+----------|
| í Remote loopback test disabled | SW1/10 | On |
|----------------------------------------+--------+----------|
| Remote loopback test enabled | SW1/10 | Off |
|----------------------------------------+--------+----------|
| í Test pattern disabled | SW1/11 | On |
|----------------------------------------+--------+----------|
| Test pattern enabled | SW1/11 | Off |
|----------------------------------------+--------+----------|
| í Elastic store disabled | SW1/12 | On |
|----------------------------------------+--------+----------|
| Elastic store enabled | SW1/12 | Off |
|----------------------------------------+--------+----------|
| í 4-wire line is connected | SW2/1 | On |
|----------------------------------------+--------+----------|
| 2-wire line is connected | SW2/1 | Off |
|----------------------------------------+--------+----------|
| í Leased line is connected | SW2/2 | On |
|----------------------------------------+--------+----------|
| Switched line is connected | SW2/2 | Off |
|----------------------------------------+--------+----------|
| í DTR signal forced high | SW2/3 | On |
|----------------------------------------+--------+----------|
| DTR signal normal | SW2/3 | Off |
|----------------------------------------+--------+----------|
| í Factory configured - do not alter | SW2/4 | N/A |
+------------------------------------------------------------+
+------------------------------------------------------------+
| LINE SPEED |
|------------------------------------------------------------|
| Synchronous Mode | Asynchronous Mode | SW1/1 | SW1/2 |
|------------------+-------------------+----------+----------|
| 9600bps | 9600bps | On | On |
|------------------+-------------------+----------+----------|
| 19.2Kbps | 19.2Kbps | Off | On |
|------------------+-------------------+----------+----------|
| í 56Kbps | 38.4Kbps | On | Off |
|------------------+-------------------+----------+----------|
| 64Kbps | 57.6Kbps | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK SOURCE |
|------------------------------------------------------------|
| Setting | SW1/3 | SW1/4 |
|--------------------+-------------------+-------------------|
| í Remote | On | On |
|--------------------+-------------------+-------------------|
| Internal | Off | Off |
|--------------------+-------------------+-------------------|
| External | Off | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|------+-------+----------+----------------------------------|
| SD | Red | On | CSU/DSU is transmitting data |
|------+-------+----------+----------------------------------|
| SD | Red | Off | CSU/DSU is not transmitting data |
|------+-------+----------+----------------------------------|
| RD | Red | On | CSU/DSU is receiving data |
|------+-------+----------+----------------------------------|
| RD | Red | Off | CSU/DSU is not receiving data |
|------+-------+----------+----------------------------------|
| CD | Red | On | Carrier signal detected |
|------+-------+----------+----------------------------------|
| CD | Red | Off | Carrier signal not detected |
|------+-------+----------+----------------------------------|
| CTS | Red | On | CTS signal is high |
|------+-------+----------+----------------------------------|
| CTS | Red | Off | CTS signal is low |
|------+-------+----------+----------------------------------|
| RTS | Red | On | RTS signal is high |
|------+-------+----------+----------------------------------|
| RTS | Red | Off | RTS signal is low |
|------+-------+----------+----------------------------------|
| OL | Red | On | Network signal detected |
|------+-------+----------+----------------------------------|
| OL | Red | Off | Network signal not detected |
|------+-------+----------+----------------------------------|
| TM | Red | On | CSU/DSU is in test mode |
|------+-------+----------+----------------------------------|
| TM | Red | Off | CSU/DSU is not in test mode |
|------+-------+----------+----------------------------------|
| TM | Red | Blinking | Error detected in test pattern |
+------------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| AUTO-ANSWER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S0=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls when the CSU/DSU will |
| | automatically answer an incoming call. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S0=0 | Auto-answer disabled. |
|---------------+--------------------------------------------|
| S0=1 | CSU/DSU will always answer incoming calls. |
|---------------+--------------------------------------------|
| í S0=2 | CSU/DSU will answer incoming calls when |
| | DTR signal is high. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA LENGTH |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S12=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects how many data bits will be |
| | transmitted. |
|------------------------------------------------------------|
| Command | Function |
|-----------------------------+------------------------------|
| í S12=0 | 8 data bits. |
|-----------------------------+------------------------------|
| S12=1 | 7 data bits. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA PARITY |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S14=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects what type of parity bit will be |
| | transmitted. |
|------------------------------------------------------------|
| Command | Function |
|----------------------------+-------------------------------|
| í S14=0 | No parity. |
|----------------------------+-------------------------------|
| S14=1 | Even parity. |
|----------------------------+-------------------------------|
| S14=2 | Odd parity. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA STOP |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S13=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects how many stop bits will be |
| | transmitted. |
|------------------------------------------------------------|
| Command | Function |
|----------------------------+-------------------------------|
| í S13=0 | 1 stop bit. |
|----------------------------+-------------------------------|
| S13=1 | 1.5 stop bits. |
|----------------------------+-------------------------------|
| S13=2 | 2 stop bits. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL MODE - ASYNCHRONOUS |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S15=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects how the CSU/DSU will perform |
| | dialing in asynchronous mode. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S15=0 | Asynchronous dialing disabled. |
|---------------+--------------------------------------------|
| S15=1 | Dial number in memory location 0 on DTR |
| | going high. |
|---------------+--------------------------------------------|
| í S15=2 | AT dialing enabled. |
|---------------+--------------------------------------------|
| S15=3 | Dial number in memory location 0 on DTR |
| | going high and AT dialing enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL MODE - SYNCHRONOUS |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S2=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects how the CSU/DSU will perform |
| | dialing in synchronous mode. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| S2=0 | Synchronous dialing disabled. |
|---------------+--------------------------------------------|
| S2=1 | Dial number in memory location 0 on DTR |
| | going high. |
|---------------+--------------------------------------------|
| í S2=2 | V.25bis dialing enabled. |
|---------------+--------------------------------------------|
| S2=3 | Dial number in memory location 0 on DTR |
| | going high and V.25bis dialing enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DSR SIGNAL |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S9=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the behavior of the DSR signal. |
|------------------------------------------------------------|
| Command | Function |
|----------------+-------------------------------------------|
| í S9=0 | DSR forced high. |
|----------------+-------------------------------------------|
| S9=1 | DSR low when off-line or in test mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ECHO CANCELLER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S7=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the echo canceller tone. |
|------------------------------------------------------------|
| Command | Function |
|-----------------+------------------------------------------|
| í S7=0 | Echo canceller tone disabled. |
|-----------------+------------------------------------------|
| S7=1 | Echo canceller tone enabled. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HELP |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] $ [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the help screens. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INACTIVITY TIMER |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S3=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects how long the line must be inactive |
| | for the CSU/DSU to disconnect. |
|------------------------------------------------------------|
| Command | Function |
|-----------------+------------------------------------------|
| í S3=0 | Disconnect on low DTR only. |
|-----------------+------------------------------------------|
| S3=1 | Set inactivity timer to 10 minutes. |
|-----------------+------------------------------------------|
| S3=2 | Set inactivity timer to 30 minutes. |
|-----------------+------------------------------------------|
| S3=3 | Set inactivity timer to 60 minutes. |
|-----------------+------------------------------------------|
| S3=4 | Set inactivity timer to 10 minutes and |
| | disconnect on low DTR. |
|-----------------+------------------------------------------|
| S3=5 | Set inactivity timer to 30 minutes and |
| | disconnect on low DTR. |
|-----------------+------------------------------------------|
| S3=6 | Set inactivity timer to 60 minutes and |
| | disconnect on low DTR. |
|-----------------+------------------------------------------|
| S3=7 | Do not disconnect on inactivity or low |
| | DTR. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REDIAL |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S1=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 0 |
|--------------+---------------------------------------------|
| Range: | 0 - 99 |
|--------------+---------------------------------------------|
| Unit: | 1 redial |
|--------------+---------------------------------------------|
| Description: | Sets how many times the CSU/DSU will |
| | attempt to redial a failed call. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REMOTE CONFIGURATION REQUEST |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S19=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls requests for remote configuration. |
|------------------------------------------------------------|
| Command | Function |
|-----------------+------------------------------------------|
| í S19=0 | Remote configuration requests denied. |
|-----------------+------------------------------------------|
| S19=1 | Remote configuration requests granted. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESET |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Rn [cmds] |
|--------------+---------------------------------------------|
| Description: | Resets the CSU/DSU to power-up status. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RTS SIGNAL |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S8=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Controls the behavior of the RTS signal. |
|------------------------------------------------------------|
| Command | Function |
|---------------------------+--------------------------------|
| í S8=0 | RTS forced high. |
|---------------------------+--------------------------------|
| S8=1 | RTS follow CTS. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SYNCH/ASYNCH MODE |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S4=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the CSU/DSU is in |
| | synchronous or asynchronous mode. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| í S4=0 | CSU/DSU is in asynchronous mode. |
|---------------+--------------------------------------------|
| S4=1 | CSU/DSU is in synchronous mode. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TRANSMIT PROFILE |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Wn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sends the current S-Register and switch |
| | settings to the remote CSU/DSU. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.25bis FORMAT |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S16=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects bit- or byte-oriented dialing for |
| | V.25bis mode. |
|------------------------------------------------------------|
| Command | Function |
|------------------------+-----------------------------------|
| í S16=0 | Bit-oriented dialing. |
|------------------------+-----------------------------------|
| S16=1 | Byte-oriented dialing. |
+------------------------------------------------------------+
Proprietary V.25bis Command Set
+------------------------------------------------------------+
| DIAL STORED NUMBER |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | CRSnn |
|--------------+---------------------------------------------|
| Description: | Dials the number stored in memory location |
| | nn. |
+------------------------------------------------------------+