Siemens DataNET Hub (DNH) - Manual (Page 43)

2000585-001 Installation •••• 35
DataNET Hub Signal Equalizer Board, Continued
When cable lengths are unknown, or the cable is other than the recom-
mended cable (Table 2-1.), signals must be compared at the Hub to
identify which Equalizer board settings are needed. See page 37.
If the lengths of copper cable exceed those shown in Table 2-2, follow
this procedure. See sample calculations page 36. This procedure will set
switches SW1, SW2 and SW3 on the Signal Equalizer Board.
Step Action
1. Measure and record the longest cable run (in Feet) con-
nected from a device to any HUB port. The longest cable
run does not require a Hub Signal Equalizer board.
2. Calculate the difference between the longest cable length
and the length of cable connected to the port you wish to
equalize.
3. Locate the difference in feet in the first column (Feet of Ca-
ble) of Table 2-2.
4. Identify the correct Selection range in column two of Table
2-4 and set switches SW3, SW2 and SW1.
SW2
SW1
SW3
5.
Repeat the procedure for each connected port on the Hub
except the longest length that does not have an equalizer
board.
Switch Setting for
Unknown Cable
Lengths
Switch Settings for
Known Cable Lengths