Advance DataNET Hub User's Manual

36 •

••

• Installation 2000585-001

DataNET Hub Signal Equalizer Board, Continued

Selec-

tion

Ratio

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