Realize monitor of remote equipment from local equipment (consists two row of LEDs, upper row indicate local status and lower row indicate remote status)
Based on self-copyright IC
Provides 30 channels audio port, FXO and FXS for select
Voice port supports o-port and s-port
O-port connect with switch and s-port connect with telephone
Voice port can be 2/4 E&M frequency
Supports incoming call display and inverted polarity charging
Supports signal transmission function among all end points
Optical port supports SC/FC and single fiber optic interface
