Toshiba Strata CTX28 GCDU1A - 3 CO Lines and 8 DKT Phones Station Extension Circuit Card
The Toshiba GCDU1 PCB adds an additional 3 CO lines with Caller ID units, and 8
digital telephone circuits with a single PCB. With the GCDU1, the CTX28 supports up to 16
digital telephones (DKTs), 6 CO lines and 6 Caller ID circuits.