Guardian Technologies , LLC Home Security System DVST Manuel d'utilisateur Page 26

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6.2 Demo Cable
This cable allows two DVST units to be connected back to back without the need for
connection to MODEMs or Terminal Adapters.
Tech Note:
This is a synchronous balanced transmission. Transmit and receive lines therefore
cross yet maintain polarity. The flying lead is used to source a clocking signal from the
MODEM port.
Page 14 Dedicated Micros Ltd
Demonstration Mode DVST Installation Guide
Fig: 3 Wiring details for demo cable
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