Sometimes it is necessary to check the signal level or other parameters on a remote device when the link is down. For example, one may want to see what the RSL/RSSI shows at the far end when the near side is not transmitting.
If it is not feasible to have an out of band method of accessing the far side (through redundant link, a ring, cellular modem, etc.), it is possible to capture some data without making a site visit.
In order to check this without making a site visit, simply follow the steps below:
- Login to the far side radio's web interface and access the link test feature under the System Status heading.
- Start a linktest with an appropriate number of cycles that will be long enough for the test. For example, 10-20 is usually sufficient. This is done by entering the number 10 or 20 in the small input box and hitting submit. You may also enter a larger number like 60 or 99 for a longer test.
- On the near side radio, login to the web interface config node or CLI config node.
- Disable the near side opmode or transmitter. This will break the link and the far side should have no signal coming into it any longer.
- Wait for 10-60 seconds as your conditions permit. The linktest running on the far side captures results every few seconds and saves them to a temporary file.
- On the near side, re-enable the opmode or transmitter.
- Access the far side again and click show result on the Link Test page.
- You will now see the linktest results for the number of iterations specified (assuming it has completed fully). You will likely see a number of lines showing locked and then some that show the link unlocked (0) and the reduced RSSI. Assuming no other interfering signals, the RSSI should show -90 in most cases.