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Line Interface Modules
Shielding Jumper
Each link has a shield connection on pin 1. This shield connection can be connected to chassis
ground using a jumper. The default configuration on the SI-2C or SI-4C LIM connects the shield to
the chassis ground (jumper is installed). If you want the shield connected to chassis ground, skip
this section. If you are unsure of your configuration, consult a system engineer familiar with your
site.
You have the option of disconnecting the shield-to-chassis ground connection via a jumper for each
link labeled SHIELD 0, 1, 2, or 3
specific RF/EMI problems.
In general, the shield must be connected to a chassis ground on ONE end of the cable only. This
allows the shield conductor to "drain" RF energy to ground without carrying any "ground loop"
currents. Connecting the shield to chassis at both ends of the cable is NOT recommended.
To disconnect the shield for each link, remove the jumper labeled SHIELD 0, 1, 2, or 3 for each
link. The jumpers are located just behind the LIM front panel.
Figure 5-17
032R440-000
Issue 17
(Figure
Resistor Packs
PORT 3
PORT 2
DCE
DTE
DTE
DCE
SHIELD 3
SHIELD 2
S1-2C/SI-4C Jumper Locations
Xedge 6000 Hardware
Installation & Setup Guide
Serial I/O (SI-2C/SI-4C) LIM Overview
5-17). This may be desirable in some installations with
PORT 1
PORT 0
DCE
DTE
DCE
Shield Jumpers
SHIELD 1
SHIELD 0
DTE
5-31
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