PTP 850 E Constantly rebooting

Products PTP
1

hello all we have this 850 c and 850 e that has been installed on a old mine on the one side and a new tower build on the other.

the new tower side is approx 50 ft tall with a 2/0 ground at the base of the tower that the poe lpu are tied into, and is operating fine.

the mine side however is driving us crazy.

the runs from the poe to the dishes are approx 60 meters.

we have installed the lpu and the grounds at the dishes right below the dishes onto the steel structure, that is 100 years old.

at first we thought it was voltage drop on the poe injectors over the 60 meters, as it only reboots when the radios are actually connected to a wan port on the respective routers. and passing traffic, approx couple of gigs.

when the wan ports are disabled they happily sit there with no reboots. hence why we thought it was a poe issue.

we then cabled it via dc with a proper dc power supply and same issue only slightly worse. i understand that these are positively grounded and we do not have a isolated ground on the location.

there is however a ground 60 meters down several floors that is in a electrical panel.

the trouble shooting suggested and tried was to remove the lpu and chassis grounds on radio to see if it still happens and yes it does.

the cambium recommendations are for a 6 guage to be installed to a ground not more than 5 meters away, but we cannot do this.

i did notice on the forums somewhere that the grounding issues would cause constant reboots??

but i would have thought that no grounds would have at least cause the radios to stay alive. we were doing this just for trouble shooting purposes.

do we have to run a 4 guage or 6 guage from the electrical panel 60 meters away and tie all of the lpu chassis grounds to it.

the strange part is that under no load it is happy…

comments ???

2

Here’s the table of the interfaces available on the 850e.

image
image638×248 12 KB

SInce you did not mention any fiber connection, but rather just the WAN connection, have you tried taking the traffic onto an SFP+, either Port 3 or Port 5?

Practical Rules of Thumb

  • QSFP+ = your main payload pipe

  • SFP+ = secondary / 10G flexibility

  • SFP (multiband) = resiliency layer

  • RJ45 = management only

This issue you have sounds like you have AC induction on the Cat 5/6 data on the POE port. When the port is not terminated on the device below, the radio functions fine, but when it is connected, the reboots begin, and they are worse if you are using DC instead of POE. The POE current flowing in the Cat 5 cable tends to behave like sealing current. If your problem is induced power on the Cat 5, PoE would tend to behave better. My suggestion is to run the data on fiber on Port 3 using SFP+, and power the 850e with 48v DC.

Hope this helps.

3

sorry should have clairified.

yes we are using the sfp fiber port for our 10 gig data transport.

as this is a combined two radio link of the 850 c and the 850 e there is a fiber link cable from the sfp + ports to combine the two radios.

4

the poe network port is just for management, it was for poe injection, to start and we thought it was a voltage drop so we cabled the dc as well.

support now wants us to go back to the poe and still use the fiber for transport obviously.

5

update.

we have regrounded the radio’s and replaced the radio itself and it seems to have stabilized.