TLU 23,STD Analog trunk card

The board can be adapted for two- or four-wire connection, for different line impedances, for different transmission levels and for different voltages on the signalling wires. This interface constitutes a 32-channel PCM (30 voice/data-channels) with HDB3-code and an input/output port of 75 ohms resistive, unbalanced to earth. Refurbished