Coupling between the two SIMATIC TDC systems is realized with the
ipConv protocol converter.
The protocol converter and the control station communicate via IEC 60870-5-101. The
proprietary Simatic TDC protocol is used for the communication towards the SIMATIC TDC
An ISDN router is accessed via a dial-up telephone line for remote
maintenance. An optical wave guide (LWL) is used to bridge the 300 m transfer distance
between the telephone connection and the protocol converter. The
physical link to the protocol converter is realized with a media converter,
which converts from optical signalling to Ethernet.