Being that we're talking about NLOS, I wonder if it's differences in how ePMP deals with multipath or something like that.
On Thu, Sep 10, 2015 at 9:34 PM, Christopher Gray < cg...@graytechsoftware.com> wrote: > 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 <installe...@foxvalley.net > > 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 >> >> >> >
