Siemens Advance DataNET, Руководство пользователя

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36 •••• Installation 2000585-001
DataNET Hub Signal Equalizer Board,
Continued
Selec-
tion
Ratio
DB
loss SW1 SW2 SW3
1 2 3 1 2 3 1 2 3
1 1 0 on on off on on off on on off
2 1.5 3.5 off off on on on off on on off
3 2.2 6.8 on on off off off on on on off
4 3 9.4 off off on off off on on on off
5 3.5 11 on on off on on off off off on
6 4.1 12.3 off off on on on off off off on
7 4.8 13.6 on on off off off on off off on
8 5.2 14.3 off off on off off on off off on
Calculation One:
Assume connections to Port 1 and Port 2 only.
Port 1 cable = 1000 ft. in length
Port 2 cable = 4000 ft. in length (3000 ft. difference)
Result:
Based on Table 2-2 data,
Port 1 requires compensation for 3000 ft. Selection 4 (2500-3500 feet)
Port 2 requires no compensation. Selection 1 (0 dB loss)
Calculation Two:
Assume connections to Port 1, Port 2, and Port 6
Port 6 cable = 5000 feet
Port 1 cable = 1000 ft. (5000 ft. - 1000 ft. = 4000 ft. difference)
Port 2 cable = 4000 ft. (5000 ft. - 4000 ft. = 1000 ft. difference)
Result:
Based on Table 2-2 data,
Port 6 requires no compensation. Selection 1 (0 dB loss)
Port 1 requires compensation for 4000 ft. Selection 6 (3500 - 4500)
Port 2 requires compensation for 1000 ft. Selection 2 (500 - 1500 ft.)
Note that the lengths of Port 1 and Port 2 cable are the same as in Cal-
culation One, however, with the addition of a longer length for Port 6,
new settings are required for Port 1 and Port 2.
Table 2-2. Recommended
Equalizer Board Settings
Sample Calculations