18
Testing and Fault Finding (Troubleshooting)
(*1) Power LED is Off
Unplug the ODU connection from the PIDU and check the power LED illumination. If the
power LED still does not light then check the power source.
(*2) Power LED is Flashing
Check that pins 4&5 and 7&8 are not crossed with pins 1&2 and 3&6 on the RJ45, and also
greater than 100K ohms between pins 1&8.
(*3) Ethernet LED did not Flash 10 Times
Check that the wiring to pins 4&5 and 7&8 is correct. For example, the wiring to pins 4 and
7 may be crossed.
(*4) No Ethernet Activity
Check that the wiring to pins 1&2 and 4&6 is correct. For example, the wiring to pins 1 and
3 may be crossed.
(*5) Irregular Ethernet Activity
The yellow Ethernet LED should blink randomly as normal traffic passes through. If the
Ethernet LED flashes irregularly, for example there is a short flash followed by a long flash,
this indicates that the ODU has booted in recovery mode. The causes may be installation
wiring or a corrupt ODU software load.
(*6) Connection is not 1000 BaseT
If the Ethernet connection to the network is only 10/100 BaseT, when 1000 BaseT is
expected, check that the wiring to pins 4&5 and 7&8 is correct. For example, the wiring to
pins 4 and 7 may be crossed.
(*7) Test RJ45 Resistance
If the above tests fail to diagnose the issue, there may be a fault in the wiring of the RJ45
cable that connects the ODU (or LPU) to the PIDU. Perform the following tests:
Step 1:
Unplug the RJ45 cable from the PIDU and check that the resistances
between pins are correct as specified in
Table 1
.
Resistances should fall or -10% of the stated values.
Step 2:
Ensure that there is greater than 100K ohms between pin 1 and ODU ground
for all cable lengths.
Step 3:
Ensure that there is greater than 100K ohms between pin 8 and ODU ground
for all cable lengths.
Step 4:
Ensure that there is greater than 100K ohms between pin 1 and pin 8 for all
cable lengths.
More information:
PTP 300 Series User Guide
or
PTP 500 Series User Guide
Section:
“Troubleshooting (Fault Finding)”
4Gon www.4Gon.co.uk [email protected] Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
