INSTALLATION SD39RIO-1
January 2001
2-32
I/O BUS
TERMINATE
CONTINUE
I/O BUS
CONTINUE
I/O BUS
ATTENUATION
3dB
WRONG
WAY!
!
SHUNT
ATTENUATOR
I/O BUS
TERMINATE
CONTINUE
I/O BUS
OR
(Two Orientations)
(One Orientation Only)
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Top
Figure 2-21 Shunt and Attenuator Orientations
To install one or more attenuators:
1. Locate the rack at the far end of the IOBUS. This is the non-control module end of the IOBUS. Use this
point to start measurements.
2. Measure 30 meters along the IOBUS towards the control module. From that point, continue progressing
along the IOBUS until a rack is encountered.
3. Remove the shunt from the W4 socket (Remote I/O Rack) or W10 socket (MODULRAC or SIXRAC)
on the rack’s backplane and replace it with a properly oriented attenuator.
4. Repeat steps 2 and 3 as long as there is another 30-meter or longer segment of the IOBUS remaining
towards the control module or until three attenuators have been installed.
CAUTION
Do not install more than three attenuators on an IOBUS.
As an example, when the procedure is applied to the IOBUS shown in Figure 2-22, the shunt in rack B was
replaced with an attenuator.
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