What you are seeing (improvements) is a combination of a better radio (epmp) and the effect of GPS sync radios in a low to mild interference environment..
You will see such improvements thruout.. unless you run into heavy interference or another GPS radio (out of sync) operating on that channel. :) Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: [email protected] > From: "Christopher Gray" <[email protected]> > To: [email protected] > Sent: Thursday, September 10, 2015 10:34:14 PM > Subject: Re: [AFMUG] UBNT vs ePMP Signal Strength? > 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
