MULTI-TECH SYSTEMS, INC.
MT2834ECT4/MT2834ECT4I
| Modem Type | Data (synchronous/asynchronous)/Fax |
| NIC Type | Ethernet |
| Processor | 80486SLC |
| Maximum Modem Transfer Rate | 28.8Kbps |
| Maximum Fax Transfer Rate | 14.4Kbps |
| Maximum NIC Transfer Rate | 10Mbps |
| Processor Speed | 25MHz |
| Data Bus | N/A (see technical note) |
| Topology | Linear Bus/Star |
| Fax Class | Class I & II |
| Wiring Type | Unshielded
twisted pair RG-58A/U 50ohm coaxial |
| Data Modulation Protocol | Bell 103A/212A ITU-T V.22, V.22bis, V.32, V.32bis, V.34 |
| Fax Modulation Protocol | ITU-T V.17, V.27ter, V.29 |
| Error Correction/Compression | MNP5, V.42, V.42bis |
| Boot ROM | Available |
| Max. Onboard DRAM | 16MB |
CONNECTIONS |
|||
Purpose |
Location |
Purpose |
Location |
| Daughterboard connectors | CN1 & CN1A |
Keyboard | CN6 |
| Line out | CN2 |
VGA video out | CN7 |
| RG-58A/U 50ohm coaxial | CN3 |
Power | CN8 |
| Unshielded twisted pair | CN4 |
Flash BIOS for modem | FLASH |
| Serial port | CN5 |
Power switch | SW1 |
CABLE TYPE SELECTION |
||
Cable Type |
JP2 |
|
| » | RG-58A/U 50ohm coaxial |
Pins 1 & 2 closed |
Unshielded twisted pair |
Pins 2 & 3 closed |
|
LOSS OF CARRIER REBOOT CONFIGURATION |
||
Setting |
JP1 |
|
| » | Modem will not reboot on loss of carrier |
Open |
Modem will reboot on loss of carrier |
Closed |
|
DRAM CONFIGURATION |
||
Size |
Bank 0 |
Bank 1 |
2MB |
(2) 1M x 9 |
NONE |
4MB |
(2) 1M x 9 |
(2) 1M x 9 |
8MB |
(2) 4M x 9 |
NONE |
16MB |
(2) 4M x 9 |
(2) 4M x 9 |
DIAGNOSTIC LED(S) |
|||
LED |
Color |
Status |
Condition |
SD |
Red |
On |
Modem is transmitting on phone line |
SD |
Red |
Off |
Modem is not transmitting on phone line |
RD |
Red |
On |
Modem is receiving on phone line |
RD |
Red |
Off |
Modem is not receiving on phone line |
CD |
Red |
On |
Carrier signal detected |
CD |
Red |
Off |
Carrier signal not detected |
28 |
Red |
On |
Modem connected at 28.8Kbps |
28 |
Red |
Off |
Modem not connected at 28.8Kbps |
14 |
Red |
On |
Modem connected at 14.4Kbps |
14 |
Red |
Off |
Modem not connected at 14.4Kbps |
96 |
Red |
On |
Modem connected at 9600bps |
96 |
Red |
Off |
Modem not connected at 9600bps |
OH |
Red |
On |
Modem is off-hook |
OH |
Red |
Off |
Modem is on-hook |
TR |
Red |
On |
DTR signal is high |
TR |
Red |
Off |
DTR signal is low |
DIAGNOSTIC LED(S) (CON’T) |
|||
EC |
Red |
On |
Modem connected with error correction |
EC |
Red |
Off |
Modem not connected with error correction |
EC |
Red |
Blinking |
Modem connected with error correction/compression |
FX |
Red |
On |
Modem is connected in FAX mode |
FX |
Red |
Off |
Modem is not connected in FAX mode |
PWR |
Red |
On |
Power is on |
PWR |
Red |
Off |
Power is not on |
TP |
Red |
On |
UTP port active |
TP |
Red |
Off |
RG-58A/U port active |
LNK |
Yellow |
On |
RG-58A/U link is good |
LNK |
Yellow |
Off |
RG-58A/U link is not good |
RX |
Red |
On |
Modem is receiving on network |
RX |
Red |
Off |
Modem is not receiving on network |
TX |
Red |
On |
Modem is transmitting on network |
TX |
Red |
Off |
Modem is not transmitting on network |
MISCELLANEOUS TECHNICAL NOTE |
| This is a standalone network modem, designed to let other workstations share this modem and an additional one connected to the serial port. |
Proprietary AT Command Set
AUTO-RELIABLE TIME BUFFER CONFIGURATION |
||
| Type: | Configuration | |
| Format: | AT [cmds] $A n [cmds] | |
| Example: | AT $A1 &W <CR> | |
| Description: | Controls the handling of incoming data during auto-reliable time period. | |
Command |
Function |
|
| » | $A0 |
Data is discarded. |
$A1 |
Data is buffered. | |
BIT MODE |
||
| Type: | Configuration | |
| Format: | AT [cmds] $EB n [cmds] | |
| Example: | AT $EB1 E1 <CR> | |
| Description: | Selects 10- or 11-bit mode. | |
Command |
Function |
|
| » | $EB0 |
Sets 10-bit mode. |
$EB1 |
Sets 11-bit mode. | |
CALLBACK PARITY |
||
| Type: | Configuration | |
| Format: | AT [cmds] #P n [cmds] | |
| Example: | AT #P0 #DB1 <CR> | |
| Description: | Sets the parity of the modem when in callback mode. | |
Command |
Function |
|
#P0 |
No parity. | |
#P1 |
Odd parity. | |
| » | #P2 |
Even parity. |
CALLBACK PASSWORD |
|
| Type: | Configuration |
| Format: | AT [cmds] #CBN nnxxxx |
| Example: | AT#DB2 #CBN09snarf <CR> |
| Description: | Sets the callback password at memory location nn to xxxx . The password must be between 6 and 10 characters, inclusive. |
CALLBACK SECURITY |
||
| Type: | Configuration | |
| Format: | AT [cmds] #DB n [cmds] | |
| Example: | AT #DB1 S0=1 <CR> | |
| Description: | Sets the security level of the callback function. | |
Command |
Function |
|
| » | #DB0 |
Disables security and clears callback memory. |
#DB1 |
Enables local and remote security. | |
#DB2 |
Enables remote security only. | |
#DB3 |
Enables security to dial to another modem with security enabled. | |
CALLER ID INFORMATION TRANSMISSION |
||
| Type: | Configuration | |
| Format: | AT [cmds] &A n [cmds] | |
| Example: | AT &A1 <CR> | |
| Description: | Controls the transmission of Caller ID information stored in the EPROM. The ID must be inserted into the Flash BIOS image before burning. | |
Command |
Function |
|
| » | &A0 |
Caller ID information transmission disabled. |
&A1 |
Caller ID information transmission enabled. | |
CALLING TONE |
||
| Type: | Configuration | |
| Format: | AT [cmds] $T n [cmds] | |
| Example: | AT $T1 DT555-1212 <CR> | |
| Description: | Controls the transmission of the calling tone while dialing. | |
Command |
Function |
|
$T0 |
Calling tone enabled. | |
| » | $T1 |
Calling tone disabled. |
COMMAND SET |
||
| Type: | Configuration | |
| Format: | AT &Q n | |
| Example: | AT &Q1 <CR> | |
| Description: | Selects standard Hayes or custom command sets. | |
Command |
Function |
|
| » | &Q0 |
Multi-Tech custom command set enabled. |
&Q1 |
Standard Hayes command set enabled. | |
COMPRESSION |
||
| Type: | Configuration | |
| Format: | AT &E n | |
| Example: | AT &E15 #L0 <CR> | |
| Description: | Selects data compression. | |
Command |
Function |
|
&E14 |
Data compression disabled. | |
| » | &E15 |
Data compression enabled. |
COMPRESSION MODE |
||
| Type: | Configuration | |
| Format: | AT #L n | |
| Example: | AT #L2 DT555-1212 <CR> | |
| Description: | Selects active compression protocols. | |
Command |
Function |
|
| » | #L0 |
V.42 negotiation enabled. |
#L1 |
MNP negotiation enabled. | |
#L2 |
LAP-M negotiation enabled. | |
#L3 |
LAP-M enabled, no negotiation. | |
CTS SIGNAL |
||
| Type: | Configuration | |
| Format: | AT [cmds] &RF n [cmds] | |
| Example: | AT &RF0 <CR> | |
| Description: | Selects the function of the CTS signal. | |
Command |
Function |
|
&RF0 |
CTS is set to RTS. | |
| » | &RF1 |
CTS is independent of RTS. |
DIAL STORED PHONE NUMBER |
|
| Type: | Immediate |
| Format: | AT [cmds] N n1 [N n2 , N n3 ...] |
| Example: | ATM0 N1N3N5 <CR> |
| Description: | Dials stored phone number(s). If the first number is busy, the modem will proceed to the next number in the list. |
DSR SIGNAL |
||
| Type: | Configuration | |
| Format: | AT [cmds] &SF n [cmds] | |
| Example: | AT &SF0 <CR> | |
| Description: | Selects the function of the DSR signal. | |
Command |
Function |
|
| » | &SF0 |
DSR follows CD. |
&SF1 |
DSR normal. | |
DTR DIALING |
||
| Type: | Configuration | |
| Format: | AT [cmds] $D n [cmds] | |
| Example: | AT $D1 DT555-1212 <CR> | |
| Description: | Turns DTR dialing on and off. | |
Command |
Function |
|
| » | $D0 |
DTR dialing disabled. |
$D1 |
DTR dialing enabled. | |
ERASE CALLBACK NUMBER |
|
| Type: | Immediate |
| Format: | AT [cmds] #RDN n [cmds] |
| Example: | AT #RCBN05 #RDN05 <CR> |
| Description: | Erases the callback phone number at the memory location specified. |
ERASE CALLBACK PASSWORD |
|
| Type: | Immediate |
| Format: | AT [cmds] #RCBN n [cmds] |
| Example: | AT #RCBN05 #RDN05 <CR> |
| Description: | Erases the callback password at the memory location specified. |
ESCAPE SEQUENCE - OUT OF BAND |
|
| Type: | Immediate |
| Format: | <BREAK> AT [cmds] <CR> |
| Example: | <BREAK> AT #F1 <CR> |
| Description: | Puts the modem in Command Mode. |
| Notes: | Do not precede
this command with AT. <BREAK> refers to the hardware modem break signal. |
FALLBACK MODE |
||
| Type: | Configuration | |
| Format: | AT [cmds] #F n [cmds] | |
| Example: | AT #F1 O <CR> | |
| Description: | Sets direction of fallback. | |
Command |
Function |
|
#F0 |
Fallback disabled. | |
#F1 |
Fallback from 28.8Kbps to 2400bps as line quality degrades. | |
| » | #F2 |
Fallback from 2400bps to 28.8Kbps as line quality improves. |
FLOW CONTROL |
||
| Type: | Configuration | |
| Format: | AT [cmds] &E n [cmds] | |
| Example: | AT &E13 <CR> | |
| Description: | Selects flow control. | |
Command |
Function |
|
&E12 |
Flow control disabled. | |
| » | &E13 |
Flow control enabled. |
FLOW CONTROL - ENQ/ACK |
||
| Type: | Configuration | |
| Format: | AT [cmds] &E n [cmds] | |
| Example: | AT &E9 <CR> | |
| Description: | Selects ENQ/ACK pacing. | |
Command |
Function |
|
| » | &E8 |
Disables ENQ/ACK pacing. |
&E9 |
Enables ENQ/ACK pacing. | |
FLOW CONTROL IN NORMAL MODE |
||
| Type: | Configuration | |
| Format: | AT [cmds] &E n [cmds] | |
| Example: | AT &E11 O <CR> | |
| Description: | Selects XON/XOFF flow control for non-error-correcting connections. | |
Command |
Function |
|
| » | &E10 |
XON/XOFF disabled for non-error-correcting connections. |
&E11 |
XON/XOFF enabled for non-error-correcting connections. | |
FLOW CONTROL TYPE |
||
| Type: | Configuration | |
| Format: | AT [cmds] &E n [cmds] | |
| Example: | AT &E4 &W <CR> | |
| Description: | Sets type of flow control used by modem. | |
Command |
Function |
|
&E3 |
Flow control disabled. | |
| » | &E4 |
CTS/RTS flow control enabled. |
&E5 |
XON/XOFF flow control enabled. | |
HANDSHAKE ATTEMPTS |
||
| Type: | Configuration | |
| Format: | AT [cmds] #A n [cmds] | |
| Example: | AT #A1 #L3 <CR> | |
| Description: | Configures the initial handshake phase. | |
Command |
Function |
|
| » | #A0 |
Attempts in order: 28.8Kbps, 24Kbps, 21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps, 2400bps, 1200bps, 300bps. |
#A1 |
Attempts only 28.8Kbps. | |
#A2 |
Attempts in order: 28.8Kbps, 24Kbps, 21.6Kbps, 19.2Kbps, 16.8Kbps, 14.4Kbps, 12Kbps, 9600bps, 4800bps. | |
#A3 |
Attempts in order: 2400bps, 1200bps, 300bps. | |
HELP SCREENS |
|
| Type: | Immediate |
| Format: | AT $H n |
| Example: | AT $H1 <CR> |
| Description: | Shows modem help screens. |
Command |
Function |
$H1 |
Shows help screen 1. |
$H2 |
Shows help screen 2. |
$H3 |
Shows help screen 3. |
LIST CONFIGURATION |
|
| Type: | Immediate |
| Format: | AT L n |
| Example: | AT L5 <CR> |
| Description: | Lists modem configuration. |
Command |
Function |
L |
Lists all stored phone numbers. |
L5 |
Lists all settings. |
L6 |
Lists the values of all S-registers. |
L7 |
Lists extended parameters. |
L8 |
Lists current diagnostics. |
LOCAL SERIAL PORT SPEED |
|
| Type: | Configuration |
| Format: | AT [cmds] $SB nnn [cmds] |
| Example: | AT $MB9600 $SB19200 <CR> |
| Description: | Sets serial port speed. |
Command |
Function |
$SB300 |
Sets 300bps speed. |
$SB1200 |
Sets 1200bps speed. |
$SB2400 |
Sets 2400bps speed. |
$SB4800 |
Sets 4800bps speed. |
$SB9600 |
Sets 9600bps speed. |
$SB19200 |
Sets 19.2Kbps speed. |
$SB38400 |
Sets 38.4Kbps speed. |
$SB57600 |
Sets 57.6Kbps speed. |
$SB115200 |
Sets 115.2Kbps speed. |
LOCK SERIAL PORT |
||
| Type: | Configuration | |
| Format: | AT [cmds] $BA n [cmds] | |
| Example: | AT $SB57600 $BA0 <CR> | |
| Description: | Sets operation of serial port speed. | |
Command |
Function |
|
| » | $BA0 |
Serial speed locked at rate set by $SB. |
$BA1 |
Serial speed follows connect speed, ignoring $SB. | |
LOGIN PASSWORD |
|
| Type: | Configuration |
| Format: | AT [cmds] #I xxxx |
| Example: | AT #IMicroHouse <CR> |
| Description: | Sets the login password to xxxx . The password must be between 6 and 10 characters, case sensitive. It defaults to MULTI-TECH. |
MAXIMUM BLOCK SIZE FOR TRANSMISSION |
||
| Type: | Configuration | |
| Format: | AT [cmds] &BS n [cmds] | |
| Example: | AT &BS1 &MB28800 <CR> | |
| Description: | Sets the maximum transmittable block size. | |
Command |
Function |
|
&BS0 |
Maximum block size is 64 characters. | |
| » | &BS1 |
Maximum block size is 128 characters for LAP-M, and 256 characters for MNP. |
REDIAL |
|
| Type: | Immediate |
| Format: | A: |
| Example: | A: |
| Description: | Redials the last number dialed until it is no longer busy. |
| Note: | Do not precede this command with AT or follow it with <CR> . |
REMOTE CONNECT SPEED |
|
| Type: | Configuration |
| Format: | AT $MB nnn |
| Example: | AT $MB9600 $SB19200 <CR> |
| Description: | Sets maximum remote connect speed. |
Command |
Function |
$MB75 |
Sets V.23 (1200bps/75bps bi-directional). |
$MB300 |
Sets 300bps connect. |
$MB1200 |
Sets 1200bps connect. |
$MB2400 |
Sets 2400bps connect. |
$MB4800 |
Sets 4800bps connect. |
$MB9600 |
Sets 9600bps connect. |
$MB14400 |
Sets 14.4Kbps connect. |
$MB19200 |
Sets 19.2Kbps connect. |
$MB28800 |
Sets 28.8Kbps connect. |
RETRANSMIT FAIL ACTION |
||
| Type: | Configuration | |
| Format: | AT [cmds] $R n [cmds] | |
| Example: | AT $R1 <CR> | |
| Description: | Sets whether the modem gives up on a bad connection. | |
Command |
Function |
|
| » | $R0 |
Hang up after 12 failed retransmissions. |
$R1 |
Do not hang up after 12 failed retransmissions. | |
SETUP PASSWORD |
|
| Type: | Configuration |
| Format: | AT [cmds] #S xxxx |
| Example: | AT #SsNaFu <CR> |
| Description: | Sets the setup password to xxxx . The password must be between 6 and 10 characters, case sensitive. It defaults to MODEMSETUP. |
STORE PHONE NUMBER IN NVRAM |
|
| Type: | Configuration |
| Format: | AT [cmds] D <#> N n [dialstring] |
| Example: | AT D555-1212N1 <CR> |
| Description: | Stores a phone number in the modem’s memory. |
TRELLIS MODULATION |
||
| Type: | Configuration | |
| Format: | AT [cmds] #T n [cmds] | |
| Example: | AT #T1 <CR> | |
| Description: | Controls Trellis Coded Modulation. | |
Command |
Function |
|
#T0 |
Disables TCM. | |
| » | #T1 |
Enables TCM. |
UUCP SPOOFING |
||
| Type: | Configuration | |
| Format: | AT [cmds] $SP n [cmds] | |
| Example: | AT $SP1 O <CR> | |
| Description: | Controls the UUCP spoofing function. | |
Command |
Function |
|
| » | $SP0 |
Spoofing disabled. |
$SP1 |
Spoofing enabled. | |
XON/XOFF PASS-THROUGH |
||
| Type: | Configuration | |
| Format: | AT [cmds] &E n [cmds] | |
| Example: | AT &E7 O <CR> | |
| Description: | Selects whether XON/XOFF signals are sent to remote modem. | |
Command |
Function |
|
| » | &E6 |
XON/XOFF signals trapped by local modem. |
&E7 |
XON/XOFF passed through local modem. | |
XOFF SEND |
||
| Type: | Configuration | |
| Format: | AT [cmds] #X n [cmds] | |
| Example: | AT #X1 <CR> | |
| Description: | Selects how XOFF signal is sent. | |
Command |
Function |
|
| » | #X0 |
Single XOFF character sent until ready. |
#X1 |
Multiple XOFF characters sent until ready. | |