Siemens DataNET Hub (DNH) user manual Sample Calculations, Recommended, Equalizer Board Settings

DataNET Hub Signal Equalizer Board, Continued

Table 2-2. Recommended

Selec-

DB

Equalizer Board Settings

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

Sample Calculations

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.

36 • Installation 2000585-001