Table of Contents
Advertisement
Line Interface Modules
155E-2 STM-1 Chassis Ground Jumper
The 155E-2 has a Chassis Ground jumper for each link that must be set prior to installing the LIM.
With the jumper positioned closer to pin 1 (as shown in
RX connector is connected to chassis ground. With the jumper positioned away from pin 1 (storage
position), the shield is not connected to chassis ground.
Important Shield Grounding Considerations
Disconnecting the shield-to-chassis ground connection via a jumper for each RX link may be
desirable in some installations with specific RFI/EMI problems. In general, the shield must be
connected to a chassis ground on ONE end of the cable only to allow 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.
155E-2 STM-1 Boot Jumper (Factory Use Only)
The Boot Jumper is for factory use only. It is shown in
Normal (store) position shown (Pins 1 and 2) is just for storing the jumper. That is, removing
the jumper from this "store" position has no effect on the operation of the jumper settings on the
155E-2 LIM.
Cabling
•
The 155E-2 LIM uses one 75-ohm coaxial cable each for transmit and receive, following
law. Maximum insertion loss is approximately 12.7 db at 78 MHz.
•
IMPORTANT! Refer to
with all domestic and international Class A EMI-RFI suppression requirements.
5-26
155E-2 STM-1 Electrical LIM Overview
Class A EMI-RFI Suppression Requirements (Figure
Xedge 6000 Hardware
Installation & Setup Guide
Figure
5-15), the shield on the associated
Figure 5-15
for reference only. The
032R440-000
Issue 17
F
5-25) to comply
Advertisement
Table of Contents
