There are ways to do it without sync. I have over 120 Trango AP's (over
30 of them with omni antennas) all running perfectly. Some towers have
as many as 4 AP's in the same band within 10ft of each other.
Travis
Microserv
Forrest W Christian wrote:
Marlon K. Schafer wrote:
Hmmm. Would you want to change out 60ish customers?
Been there done that. Swapping out ~15 2.4Ghz 802.11b customers over
the next two days to canopy. We swapped around 75 Trango customers
when we first turned Canopy up. We've probably got around 100
802.11b's left on the net (30ish each on 3-4 Ap's) and they're slowly
getting changed.
Will canopy go 17+ miles?
Yep... Trimmed to just show the relevant information:
*LUID: 014* : MAC: 0a-00-3e-23-24-c0
<http://172.19.74.67:1080/?mac_esn=0a003e2324c0> State: IN SESSION
(Encrypt Active)
Session Timeout: 0, AirDelay 2258 (approximately 20.95 miles
(110642 feet))
Session Count: 2, Reg Count 1, Re-Reg Count 1
RSSI (Avg/Last): 810/817 Jitter (Avg/Last): 4/4 Power Level
(Avg/Last): -76/-76
*LUID: 058* : MAC: 0a-00-3e-23-02-aa
<http://172.19.74.67:1080/?mac_esn=0a003e2302aa> State: IN SESSION
(Encrypt Active)
Session Timeout: 0, AirDelay 2532 (approximately 23.50 miles
(124068 feet))
Session Count: 3, Reg Count 2, Re-Reg Count 2
RSSI (Avg/Last): 903/905 Jitter (Avg/Last): 3/4 Power Level
(Avg/Last): -69/-69
*LUID: 064* : MAC: 0a-00-3e-20-c4-07
<http://172.19.74.67:1080/?mac_esn=0a003e20c407> State: IN SESSION
(Encrypt Active)
Session Timeout: 0, AirDelay 2552 (approximately 23.68 miles
(125048 feet))
Session Count: 4, Reg Count 3, Re-Reg Count 1
RSSI (Avg/Last): 814/805 Jitter (Avg/Last): 4/3 Power Level
(Avg/Last): -76/-76
Uptime on this particular AP is 24 days... to interpret the Session
counts accordingly. I suspect the session counts shown are customer
power-related issues during that period (lightning season) and not
necessarily RF related. (RF problems generally cause a lot of Re-Regs).
Will canopy NOT interfere with all of the other systems in the area?
No more than any other loaded system will interfere. We have had
802.11b and 2.4 Canopy AP's on the same tower for weeks at a time
during swap periods with very few problems - no more than you'd expect
from having two collocated AP's. Most of the complaints people have
with the Canopy stuff interfering with them is more related to poor RF
engineering on the interferred with system (links running right at the
edge, and the added ambient noise of another operator knocks them off
the air). Properly engineered systems will generally survive a canopy
deployment in the area.
That said, Canopy will generally be the last man standing as noise
goes up, which makes them look bad since the assumption is that since
the Canopy system isn't being interfered with that it must be the
cause. I used to believe that canopy was bad and evil but then
finally had enough of trying to make 802.11b (and trango) work and
then switched to Canopy. I'm not looking back.
What I need to find are wifi radios that have good rx and tx
properties. I also need to find some better hpol sectors.
I'm not sure if my previous email made it to the list which stated
"what you need is a radio with transmit synchronization" - and then
mentioning Canopy and WiMax. I also understand that Mikrotik and
others are working on synchronizing 802.11bg in some way as well. A
large problem with multiple-AP sites is that AP #1 transmitting kills
the sensitivity of AP#2's receiver and so you spend a lot of time and
effort trying to get enough separation (polarity and/or distance). TX
synchronization fixes that particular issue. Cellular does it, Canopy
does it, WiMax supports it, Trango claims they are going to support
it, etc.
-forrest
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