This card interfaces the Operator Station to the TDC 2000 Data Hiway.

When the Operator Station requires access to the Hiway, this card generates a request signal. When the grant signal is received from the Hiway Traffic Director, this card accepts data from memory and adds the Op Station address. This word is then passed to the Cable Driver and Detector card.

Data returned from the Cable Driver card to this card is checked to verify that the box address is correct, and if so the data is passed on to memory.

If an excess number of Hiway errors are detected by the Op Station, the CPU directs this Cable Logic card to issue a switch command to the HTD.