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by 16mc
Mon Mar 15, 2010 6:33 pm
Forum: Wireless Networking
Topic: Recently we are facing some problems 433ah with 2 XR5
Replies: 4
Views: 963

Re: Recently we are facing some problems 433ah with 2 XR5

Should be OK (rb 4w + XR5 2x6w = 16w) since the PS only put out 19w your getting close to the limit. We have run this setup with out issues but prefer to use a beefier supply. One possible issue is low qaulity jumpers, they have been know to create interference Issues..... Does one card at a time wo...
by 16mc
Mon Mar 15, 2010 6:23 pm
Forum: Wireless Networking
Topic: is this link possible?
Replies: 7
Views: 1303

Re: is this link possible?

I have not looked a the link but providing you have clearance technically it will work. The issue becomes reliability which calculates out to 84% (with a 3ft 32dbi dish)... not good in my books. The thing is that there is a bit of magic involved and this link could work with out issue for years, the...
by 16mc
Wed Mar 03, 2010 3:44 pm
Forum: Wireless Networking
Topic: Antenna Cover for Solid Parabolic Antenna...
Replies: 4
Views: 986

Re: Antenna Cover for Solid Parabolic Antenna...

It is also possible that the "foam" is used to absorb microwave to improve the performance of the antenna and prevent/reduce reflection that may occur from the shroud. There are various type of microwave absorbing material out there and they vary widely in performance and cost.
by 16mc
Wed Feb 24, 2010 4:27 pm
Forum: Wireless Networking
Topic: 2.4 GHz best AP settings
Replies: 4
Views: 4390

Re: 2.4 GHz best AP settings

Use RTS/CTS or nestreme if possible. Increase HW retries to 6 or 8, improve poor clients.
by 16mc
Tue Feb 23, 2010 12:06 am
Forum: Wireless Networking
Topic: directly connect RF without antennas?
Replies: 5
Views: 1229

Re: directly connect RF without antennas?

1. small rubber duck on each unit 2. directly cable between connectors, with an attenuator 3. directly cable and adjust TX power to almost nothing 1 and 2 are OK and will work great, keep you signal strength to -50ish most cards will tolerate close to -30 or more but you start playing with fire at t...
by 16mc
Mon Feb 22, 2010 11:57 pm
Forum: Wireless Networking
Topic: comparison to proxim....
Replies: 6
Views: 2036

Re: comparison to proxim....

You should only see latency issues increase after 10 or so clients if you are using standard 802.11a/b/g. If you use RTS/CTS or better yet nstreme you can easily to 50+. We had no issues until we hit 75 users and we were only using a 10mhz channel so the bandwidth maxed out around 10mbps. MP11 are n...
by 16mc
Mon Feb 22, 2010 11:49 pm
Forum: Wireless Networking
Topic: How to Choose the right Antenna
Replies: 3
Views: 794

Re: How to Choose the right Antenna

For a quick and dirty way, go the the Proxim site and download there Link calculator spread sheet. The genaric section will allow you to put in distance, rx, tx and will calculate the link reliability. In general for back hauls shoot for 99.999%, lower level links could drop to 99.95-99.99%. Remembe...
by 16mc
Fri Feb 19, 2010 11:54 pm
Forum: Wireless Networking
Topic: Wireless link best practices
Replies: 22
Views: 5786

Re: Wireless link best practices

Building and "clutter"(trees etc) data tends to be very expensive, and you really only need it for doing distribution as a any microwave p2p link should be LOS when ever possible or they can be come less predicable and reliable. If you have a building you can calculate the Fresnel zone siz...
by 16mc
Fri Feb 19, 2010 9:33 pm
Forum: Wireless Networking
Topic: Wireless link best practices
Replies: 22
Views: 5786

Re: Wireless link best practices

I use both. Google earth is handy for getting positions but only if you have super Hi res of the area, if not it is a bit useless. If you have any terrain or buildings to deal with a good gps is well worth the cost as you can travel the path and find out if an obstruction is on the "line" ...
by 16mc
Fri Feb 19, 2010 3:50 pm
Forum: Wireless Networking
Topic: Wireless link best practices
Replies: 22
Views: 5786

Re: Wireless link best practices

No, the bumps are normal, and will be different for every link and antenna height combination. You just want to avoid a dip at the end (at your antenna). You also want to avoid a sharp(steep) bump at the receiving antenna as it can cause fade problems when it "rolls" of the peak due to cha...
by 16mc
Thu Feb 18, 2010 11:18 pm
Forum: Wireless Networking
Topic: Wireless link best practices
Replies: 22
Views: 5786

Re: Wireless link best practices

A bit of clarification. The First one with the sweet spot marked is a poor link at -77 as the sweet spot is not at the end of the link as in graphic # 2 where the signal is -60ish. So to move the sweet spot to your antenna you need to lower (or raise ) one of the antennas to get a graphic show in th...
by 16mc
Thu Feb 18, 2010 5:08 pm
Forum: Wireless Networking
Topic: Wireless link best practices
Replies: 22
Views: 5786

Re: Wireless link best practices

Your antenna height can (not just freznel zone) be critical to a good stable link. Once you have created your link in path loss, move the antenna height up and down at each end and watch your signal strength change. You will notice that the is a "sweet spot" where the signal is peaked and ...
by 16mc
Thu Feb 18, 2010 4:29 pm
Forum: Wireless Networking
Topic: Too frequent problems with R52n (asymetric signal levels)
Replies: 3
Views: 1057

Re: Too frequent problems with R52n (asymetric signal levels)

The R52(H) are know to blow the diversity chips resulting in a Tx/RX difference of about 15-20db. Not having worked with the N version I can't say if this is relevant or not.
by 16mc
Tue Feb 16, 2010 4:22 pm
Forum: Wireless Networking
Topic: Tx-power problems on 4.5 and nstreme dual
Replies: 2
Views: 781

Re: Tx-power problems on 4.5 and nstreme dual

Just tested one of our 2N links and the power settings work fine for 411AH, 3.30, all rates fixed, but another running on 4.2. does not work... appears power setting in 4+ are busted..... send a ticket to MT.
by 16mc
Thu Feb 11, 2010 11:52 pm
Forum: Wireless Networking
Topic: Looking for a GOOD example of Nstreme in multipoint
Replies: 29
Views: 5873

Re: Looking for a GOOD example of Nstreme in multipoint

Couldn't agree with you more. We like the platform and its flexibility as it allows us to do things the competition can't. And we can do it all on the same interface, which helps in other areas. Worked a lot with Waverider over the years and was fairly impressed with there polling. Great distributio...
by 16mc
Thu Feb 11, 2010 11:30 pm
Forum: Wireless Networking
Topic: Looking for a GOOD example of Nstreme in multipoint
Replies: 29
Views: 5873

Re: Looking for a GOOD example of Nstreme in multipoint

GPS syncing is good but it is not all roses. While I have not personally used some of the equipment that does I have heard on several occasions that that you do run in to some issues, particularly if you cells are not close in size. Guessing it has to do with the time to reach the farthest client on...
by 16mc
Thu Feb 11, 2010 9:51 pm
Forum: Wireless Networking
Topic: Frequency Spacing
Replies: 4
Views: 1058

Re: Frequency Spacing

Try and leave 5mhz or more be tween channels (edges) if gear is collocated. I find most cards seem to have selectivity of about -40db or so.. meaning if you do a scan can see a neighbouring channel at more the -60db you are likely to have problems particularly if there is no spacing between the chan...
by 16mc
Thu Feb 11, 2010 9:42 pm
Forum: Wireless Networking
Topic: Looking for a GOOD example of Nstreme in multipoint
Replies: 29
Views: 5873

Re: Looking for a GOOD example of Nstreme in multipoint

I have tried with and with out CSMA and in most cases it seems to work better with out. My take is that CSMA, being a collision detection protocol should not be needed in in a polling environment and thus should disabled as you should not have any collisions to worry about. If left on I would guess ...
by 16mc
Wed Jan 27, 2010 5:04 pm
Forum: Wireless Networking
Topic: Looking for a GOOD example of Nstreme in multipoint
Replies: 29
Views: 5873

Re: Looking for a GOOD example of Nstreme in multipoint

In most cases we use the default packet size of 3200 with best fit, with CSMA disabled(box checked). Hardware retries are set to 6. Adaptive Noise Immunity is turned on. We find we have to do some fine tuning on some sites to do to local conditions. If the AP has issues (many client disconnects) we ...
by 16mc
Tue Jan 26, 2010 11:57 pm
Forum: Wireless Networking
Topic: Surge protection?
Replies: 9
Views: 2929

Re: Surge protection?

The only time I have ever seen packet loss with devices like this is if the POE voltage is miss matched to the protection device or if you have ground that is bad. We had problems at a customers site with one and traced it to a 20vac charge on the buildings ground and neutral! We have started using ...
by 16mc
Tue Jan 26, 2010 11:39 pm
Forum: Wireless Networking
Topic: Looking for a GOOD example of Nstreme in multipoint
Replies: 29
Views: 5873

Re: Looking for a GOOD example of Nstreme in multipoint

We are using Nstreme PMP on all our APs serving over 600 clients. Most APs have around 30 or so clients and clients have packages ranging from 1.3 to 5mbps down load. Depending on the AP we see around 10mbps of through put per AP(10mhz channel). Most units are 3.30 with wireless test package, and a ...
by 16mc
Thu Jan 21, 2010 7:06 pm
Forum: Wireless Networking
Topic: good signal but high pings
Replies: 1
Views: 724

Re: good signal but high pings

Here is a list to check into high pings are mostly do to resends Interference: try different channels. Hidden node issue: depending on # of clients, often the problem shows up around 10 or more clients, to correct use RTS/CTS... info is documented in the forum. If only one client is affected, likely...
by 16mc
Fri Jan 15, 2010 12:43 am
Forum: Wireless Networking
Topic: 500km link posible?
Replies: 15
Views: 3151

Re: 500km link posible?

Technically the link will work provided you have clearance and are in a vacuum. The issue is reliability. At the distances you are looking at you can not have a quality link. If you get lucky it may work but fading due to the atmospheric conditions will make the link unstable. It may work for weeks ...
by 16mc
Tue Jan 12, 2010 5:27 pm
Forum: General
Topic: New MB old HDD?
Replies: 2
Views: 580

New MB old HDD?

We need to up grade the MB on one of our MT PC boxes that is running user manager and Dude. Is it possible with MT to just pull the HDD and move it to a new box? or is a fresh install needed to get the right drivers etc. We have paid for a level 6 lic which is associated with the HDD so I don't real...
by 16mc
Tue Jan 12, 2010 12:14 am
Forum: Scripting
Topic: Import on restart not working
Replies: 8
Views: 1342

Import on restart not working

I have created a script for configuring our CPE's. I can cut and past to the command line and it works fine. If I import from the command line it works. I exported the config and then attempted to reset and import the script using /system reset run-after-reset=file.rsc does not work. Tried calling a...
by 16mc
Mon Jan 11, 2010 4:00 pm
Forum: Scripting
Topic: Variables from a file
Replies: 2
Views: 2365

Re: Variables from a file

Thanks for the details, I'll work it in to what I have.

Thanks again.
by 16mc
Fri Jan 08, 2010 9:17 pm
Forum: Scripting
Topic: Variables from a file
Replies: 2
Views: 2365

Variables from a file

I have done a few basic scripts and I'm now embarking on a bigger project. I'd like to update several hundred CPE configuration in the field. But in order to not make a mess of things I need to save the IP info and a few other things like the radio name or RB identity before killing config and reloa...
by 16mc
Fri Jan 08, 2010 9:05 pm
Forum: Scripting
Topic: ntstreme on of script help
Replies: 2
Views: 817

Re: ntstreme on of script help

http://forum.mikrotik.com/viewtopic.php?f=7&t=29104&p=170191&hilit=ptmp#p170191 here is a link to a script that might do what you want. I works great and you can just cut and past to a terminal session. If the client looses connection it will try 20,10,5 mhz channels with and with out Ns...
by 16mc
Tue Dec 22, 2009 8:52 pm
Forum: Wireless Networking
Topic: XR2 problems, check your AP's
Replies: 1
Views: 641

XR2 problems, check your AP's

AP: RB411A, SR2, Nstreme (best fit 3200) overall CCQ 95+ Clients RB411, R52H. All software is 3.30 with wireless test on all CPE's and AP. AP RF modulation is default. Clients are limited to 24-36mbps depending on ccq qaulity 29 clients all with -70 or better signal, 80+ CCQ, Clients limited to 1.3m...
by 16mc
Fri Dec 18, 2009 4:53 pm
Forum: Wireless Networking
Topic: Strange Loading Issue/high latency on AP
Replies: 2
Views: 840

Re: Strange Loading Issue/high latency on AP

absolutely lovely! 411A are under 30% most of the time and 411AH's are hardly of of idle. Up Date: I have now confirmed the issue appears to be with the down load only and seems to be related to the bandwidth control at the AP as the results are the same across many different sites with software rev...
by 16mc
Wed Dec 16, 2009 6:24 pm
Forum: Wireless Networking
Topic: Strange Loading Issue/high latency on AP
Replies: 2
Views: 840

Strange Loading Issue/high latency on AP

AP: RB411A, SR2, Nstreme (best fit 3200) overall CCQ 95+, 90deg sector, Clients RB411, R52H. All software is 3.30 with wireless test on all CPE's and AP. AP RF modulation is default. Clients are limited to 24-36mbps depending on ccq qaulity 29 clients all with -70 or better signal, 80+ CCQ, ap overa...