Siemens DataNET Hub (DNH) user manual + 2.1 dB

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

2000585-001 Installation • 41