Table of Contents
Advertisement
11 Lightning Protection
11.4 Locating the Fault
Having identified which of the wiring cores are likely to be connected incorrectly, the location
of the faulty cable can be narrowed by disconnecting sections of the drop cable and by
unplugging the relevant RJ45 connectors from the LPUs.
As a further aid to locating the fault the Ethernet connections are also available inside the
LPU. The connections can be accessed by rotating the LPU lid as shown in Figure 98. The
Lid nut only needs to be slackened, do not remove. Test point P1 on the LPU PCB
corresponds to pin 1 on the RJ45 etc.
An indication of power on the Ethernet cable is also provided inside the LPU, LED PWR1 will
illuminate in the case of the PTP500 Series, LED PWR2 should not.
Figure 98 - PTP LPU test Points
163
Advertisement
Table of Contents
