MTI133- • • • INT
100 101 102 200 201
PSTN
Leased line  
V34 + RS232 + AT commands
V42 error detection
RS485    
RS422
Auto-baud locked
Serial interface data rate 38400 38400 38400 19200 19200
LOW POWER 10 micro-A off-line
T° -20°C to +60°C
Relay call control X1 X1 X3 X3
MODBUS call commands
UNITELWAY call commands