DMS-1200 Release 6 Operations Manual
Section 7 – DAS Device Control 81
7.5.10 PIMD Level Measurement (THOR NHROU Only)
The 20W NHROU can measure passive intermodulation (PIMD), a form of intermodulation
distortion that can occur in passive components like antenna ports, coaxial connectors and
cables. Excessive PIMD can reduce the receive sensitivity of the DAS affecting the system’s
reliability, capacity and data rate.
PIMD levels can be tested for each NHRDU in the NHROU. The lowest detectable PIMD level
value is -160dBc.
TIP: During PIMD measurement, the system must cut the TX path to generate a CW signal. The
process can take up to a minute, during which time the DAS may experience call drops.
1. Click on any of the NHRDU tabs to view the PIMD section of the configuration screen.
2. To check PIMD levels for the NHRDU (#1-#4), click the On/Off toggle until it shows On.
The system will perform the measurement, show the status in the PIMD result field, and show the
results in the PIMD Level field as described in the following table.
Field Description
User
On / Off status of PIMD measurement process.
PIMD Result Idle: PIMD measurement is idle.
Success: The function has properly completed.
Lack of ATT: There is no attenuation available.
Control Fail: PIMD measurement not available at this time. Retry.
N
Displays measured PIMD level
Table 7.28 – PIMD Measurement
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