These are both NLOS links [which ePMP appears to handle better]. The throughput increase may not have been as great if the links were LOS.
On the link I switched today, I was averaging around 7.5 Mbps one-way with the Rocket M2 right before switching. After switching to ePMP, one-way tests were averaging about 13.5 Mbps. This is on a clean 5 MHz channel with several trees in the way. The power is turned up all the way (25 dBm minus 1 dB cable loss for the 24 dBi dish, and 27 dBm minus 1 dB cable loss for the 18 dBi dish). If I setup the weaker link with ePMP to start, I would have seen -80 dBm and told the customer I would not do it. Even at -72 dBm with the Rockets I was hesitant. The ePMP links have been stable even through some heavy rain (throughput dropped to about 11.5 Mbps on the weak link). I'm going to try it for a while and keep my Rockets ready. At this point, I'm assuming the ePMP 2.4 GHz RSSI calculations are artificially low. -Chris On Thu, Sep 10, 2015 at 3:18 PM, Brian Sullivan <[email protected]> wrote: > I am not sure why the signals would read differently, but i'm curious how > you arrived at the 60 to 70% throughput increase. > Other than the ability to sync, I thought the main difference between > UBNT's M series and ePMP was the user interface?? > > On 9/10/2015 2:06 PM, Christopher Gray wrote: > > I just changed two low bandwidth 5 MHz width PTP links from Rocket M2 > radios to ePMP 2.4 GHz non-sync radios. The "signal strength" is about 10 > dB lower with the ePMP radios. Do they use a different mechanism to > calculate signal strength? > > Link 1: > > - 2x Rocket Dish RD-2G24 > - Antennas were not re-aimed when switching radios > - Radio outputs are maximized on both systems to FCC PTP limits > - UBNT signal read -62 dBm Tx / -61 dBm Rx > - ePMP singal reads -72 dBm Tx / -70 dBm Rx > > Link 2: > > - 1x Rocket Dish RD-2G24 > - 1x L-Com DPD 18 dBi Dish > - Antennas were not re-aimed when switching radios > - Radio outputs are maximized on both systems to FCC PTP limits > - UBNT signal read -70 dBm Tx / -72 dBm Rx > - ePMP singal reads -80 dBm Tx / -82 dBm Rx > > Both links were stable, and both links appear stable now. Both ePMP links > have 60-70% more throughput. Do I just need to adjust my mental meter 10 > db? Are the new signals actually as concerning as they feel? > > Thanks - Chris > > >
