G3-30FXO 30-Channel Telephone Access Board

The G3-30FXO card provides 30 telephone access lines, connecting to the 16E1 DXC card of the main board and the 16E1 DXC card of the backup board via the high-speed ST-BUS backplane bus;

Features

Local telephone interface card (FXO)
The FXO interface card mainly accomplishes:
□ Conversion between user voice signals and ST-BUS mainboard signals; conversion between user line status signals and digital signaling; and provides identification and status information for network management;
□ The FXO card is primarily used to connect interfaces of automatic user telephone exchanges, common battery telephone exchanges, etc.
□ FXS is typically used in conjunction with FXO.
□ This card supports caller ID display and also supports reverse polarity billing.
□ The LxxA light (xx being the slot number, same below) on the front panel indicates the status of the first FXO interface in the slot, and the LxxB light (xx being the slot number, same below) indicates the status of the second FXO interface in the slot. The corresponding status light on the device panel will illuminate when the FXO remote end is off-hook or the switch rings.
Relevant parameters:
Audio range: 300HZ~3400HZ;
Compression rate: A-law in ITU G.711;
Impedance: Ternary composite impedance 200Ω+560Ω//0.1uF;
Loop feed current: 25mA per line;