Cable Select allows for the faster installation of additional or replacement drives. It does this by allowing the position on the cable itself to determine whether it acts as the Master or the Slave drive on an IDE channel. Thus when replacing a drive or adding a new one, the setting of the other drive is not an issue if it also set up for Cable Select support. Otherwise, one would need to know whether the other drive installed in the system was Master or Slave, so that the corresponding jumpers could be set.
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A cable tester is used to test the electrical connections in a cable or other wired device. There are two ways to test for a connection: continuity test and resistance test. A cable tester can also test for a short by determining voltage.
The main purpose is to reduce cross-talk between the cable pairs. It also has the happy side effect of keeping the cable pairs neatly together while making connections..
A; it is to match the cable line impedance to the receiver for maximum transfer of energy
The thermocouple is an sesnsing device , when the temperature increases it increases the voltage , that voltage is used for tripping purpose
The cabling to Earth is done for electrical conductivity, not for thermal conductivity. The general idea is to get rid of excess charges.