Siemens DataNET Hub (DNH) - Manual (Page 49)

2000585-001 Installation •••• 41
Signal Equalizer Settings for Non Recommended Cable or Unknown
Cable Lengths,
Continued
Step Action
3. cont
.
The next strongest signal is on port 6. 4.8/1.25 = 3.84
20 log of 3.84 = 11.7 dB
or
ratio of 3.84
Since this signal is 11.7 dB stronger than the signal on port 4,
the attenuator board on port 6 needs to be set to selection 5
(11 dB loss). This should put this signal at about 0.7 dB
above the signal on port 4. (Selection 6 could also be used
for 12.3 dB loss if several of the other boards had been set
for signals slightly below the port 4 signal level.)
4. Ensure that the responses on all ports are within 3 dB of each
other
Example:
Port # Resulting signal level refer-
enced to port 4
1 + 2.1 dB
2 - 0.6 dB
4 0 dB
6 + 0.7 dB
8 + 0.1 dB