Toshiba GRL100-701B Instruction Manual page 250

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<Testing on site>
If the relays are tested at each installation site, the end-to-end test is performed after the
telecommunication circuit between terminals is setup. Figure 6.5.1.3 (b) shows the testing circuit
of the on-site end-to-end test.
In the on-site test, it is necessary to set the phase relationship between the test currents of each
terminal. The pulse signal PULSE generated from the synchronized sampling clock is used as a
reference phase signal at each terminal because it is in-phase between the terminals.
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