If the local unit includes at least two voice channels, both voice channels may be adjusted by a single technician and without going across the network. This is accomplished by connecting any two voice channels at the same location.
First, a signal from a fixed dBm source is applied in one direction through the connected pair, with the voice channel nearest the signal source serving as the sending channel, and the other voice channel serving as the receiving channel. Adjustment involves setting the sending channel input level to a Transmission Level Point (TLP) of a -4 dBm input level display, and the receiving channel output level to a reading of -12 dBm at the associated dB meter see figure below.
Next, the two voice channels remain connected as before, but the signal flow is reversed. What was previously the receiving voice channel now becomes the sending channel, and vice versa, and the adjustments are made in a reverse order.
If the local unit has only one voice channel, you must pair up this channel with another, compatible voice channel across the network. In this case, the adjustment procedure requires two technicians, with one at each location.
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