Cordless Telephone User Manual

Serial Port Characteristics
At the IPC-1600 RJ-45 type modular jack connectors, each serial port is
configured as Data Terminal Equipment (DTE). To connect an I/O device
(terminal or MODEM) to a serial port requires a 10-conductor or 8-conductor
modular cable and the appropriate 10-pin or 8-pin modular to 25-pin
connector adapter. Modular cables and adapters are ordered separately for the
IPC-1600.
Each of the sixteen serial ports have the following characteristics.
■ Output current is limited with 10 milliamperes being typical.
■ Power-off output impedance is 300 ohms (minimum).
■ Input resistance is 3K ohms to 7K ohms.
■ Input voltage range is +30V to -30V.
■ Input has built-in hysteresis (double thresholds).
SERIAL I/O DEVICE INTERFACE B-1