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385700-4006-006
INTRODUCTION
power level alarm as well as an output power alarm. The alarm levels are user adjustable.
The MDR path is also referred to as the LNA channel or channel 2. The LNA channel is
referenced to a pilot tone within the Distribution Line Amplifier.
The pilot tone is used (1) to
set the gain of the LNA channel and (2) to provide a method of detecting a faulty LNA module.
The LNA channel gain is user adjustable. The maximum LNA gain is +27 dB for the 4 port
DLA per output port and +30 dB for the 2 port DLA. See Table 1-2 Distribution Line Amplifier
Specifications for the range over which the gain is adjustable. Under normal operation, the
input signal is expected to be lower (nominally 10 dB) than the pilot tone.
The PA channel input alarm is used to detect a loss of input signal due to cable breakage, etc.
The PA channel output alarm and the LNA channel output alarm are combined to indicate an
amplifier failure.
Refer to Figure 1-2
DLA Block Diagram, for bi-directional amplifier major component
identification.
Document use is restricted to that described on cover
1-7
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