26
Chapter 6 - Measuring Mode UMS (Upstream-Monitoring-System)
AMA 310/UMS V21.0
be telemetry commands from field instruments, for example if a field instrument wants to change
from the passive measuring mode into an exclusive access to the headend, e.g. for a frequency
sweep.
Figure 6-8 Ranging and telemetry signals in the return path spectrum
6.6.3
MAX-HOLD-Function in the Spectrum
In the graphics display of AMA 310/UMS, also this mode does not lead to a changed display.
However, the LC display now shows the state "MaxHold" as well as the storage space number
within the UMS settings (here: 3) and the serial number (here 61317) of the field instrument which
requested the MAX-HOLD display:
Figure 6-9 LC display after MAX-HOLD request by a field instrument
6.6.4
Frequency Sweep by a Field Instrument
Also this mode (sweeping = determination of the frequency response) does not lead to a changed
representation in the graphics display. In the real time spectrum, you can see that "frequency
packets" of four sinus signals, which are close to one another, are pushed through the return path
frequency range, such that the frequency response is determined. The LC display now shows the
status "Sweeping" as well as the storage space number within the UMS settings (here: 3) and the
serial number (here 61317) of the field instrument performing the frequency sweep:
Figure 6-10 LC display during sweeping measurement by a field instrument
Ranging Peak
Telemetry