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Configuring the transceiver 21-15xx
Chapter 8
Configuring the 56/64 kbit data
communication modules
8
Configuring the transceiver 21-15xx
Follow the instructions, for setting of jumpers, given in the document delivered with the trans-
ceiver.
Here follow some recommendations on settings and connections when operating together with
protection systems from ABB. In the following the transceiver is regarded as a DTE (although
it is actually designed as a DCE) and is supposed to be connected to communication equipment
that acts as a DCE.
For synchronous communication a DCE always has to output timing signals (TC and RC) and
one input timing signal (TTC). For the DTE the opposite is valid. All clocks in a synchronous
network have the same timing and provided the phase is set correctly they also have the same
phase. This means that only one clock signal has to be used between the transceiver and the com-
munication as shown in the cases below.
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