Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Degradacion de Enlace punto a punto con Aironet 1300.

Se tiene un Radio enlace punto a punto con Aironet 1300 con version 12.3(2)JA3, pero el enlace presenta por momentos perdidas de trafico de hasta un 40%, se ejecutaron estos comandos (AP1300_TPas#dot11 dot11Radio 0 linktest) y (show dot11 linktest), pero la salida del ultimo (show), no se entiende muy bien.

y ademas,

Como se puede probar la causa de la degradacion?

Gracias.

  • Other Wireless - Mobility Subjects
10 REPLIES
Bronze

Re: Degradacion de Enlace punto a punto con Aironet 1300.

Hola, no hablo espa?ol, pero la traducci?n de Babelfish es muy buena. Hay varias cosas que pueden causar problemas. Si los conectadores de radio para la antena no se impermeabilizan correctamente ?ste causar? estas ediciones, particularmente si las ediciones son intermitentes. Las marcas del mal tiempo ocurre generalmente. ?stos tendr?n que muy probablemente ser substituidos si usted no tuvo que pelar ninguna cinta de impermeabilizaci?n de ellos para comprobar su condici?n. Si usted la desatornilla y riega sacudidas fuera de ella, eso es muy malo. Tambi?n, usted no puede tener l?nea apropiada del RF de la vista. Las antenas necesitan poder al claro la primera zona de Fresnel para funcionar correctamente. Esto se puede determinar con un an?lisis apropiado de la trayectoria. Por favor d?nos tanto Info sobre su disposici?n como usted puede. Quiz?s podemos ayudar. Ahora puedo estimar solamente. Espero que cualquiera de este le tenga sentido pues no tengo ninguna manera de comprobar a los espa?oles.

New Member

Re: Degradacion de Enlace punto a punto con Aironet 1300.

Hello John,

Thank you very much to respond, additional to this, I want to know like interpreting the exit of these commandos (AP1300_TPas#dot11 dot11Radio 0 linktest) and (show dot11 linktest). That commandos exist in Aironet 1300 with version 12.3(2)JA3 to prove the Radio link and whereupon intensity of signal must be. Thank you very much

Bronze

Re: Degradacion de Enlace punto a punto con Aironet 1300.

Saludos, ?S?, su acoplamiento es terrible! Usted tiene recomprobaciones muy exccessive, ?sta debe ser menos de 10 % en un acoplamiento ideal del puente. Intento siempre para menos el de 2%. Ser?a dif?cil decir d?nde estos n?meros deben estar, puesto que no tengo ninguna idea sobre su tienda un puente sobre el acoplamiento y la trayectoria que toma o los obst?culos en lugar, etc... Sin embargo, una explicaci?n gen?rica se puede conjeturar esta manera: los valores del dBm se reflejan en un n?mero entero negativo tal como -65dBm. Si usted mira una l?nea del n?mero con 0 en el centro (piense en un term?metro al aire libre), los n?meros positivos van a la derecha del 0, y los n?meros negativos van a la izquierda. El piso del ruido va a ser situado toda la manera a la izquierda. El objeto es tener su se?al tan lejos lejos como sea posible del lado izquierdo. Por ejemplo, el punto donde el equipo para el trabajar en 11Mbps es cerca de -86 o el somewhwere adentro all? y ?l pudieron ser m?s alto en -80, dependiendo de qui?n lo hace. La se?al tiene que ser por lo menos DB 25 y preferiblemente 30 lejos del piso del ruido de su equipo particular de tener acoplamiento confiable. Seg?n su prueba, sus se?ales est?n en -79, -81 y -86 en la mayor?a intenta. Esta es la raz?n por la cual la radio est? transmitiendo en 5.5Mbps y todo el manera abajo a los 1Mbps, porque no puede sostener un acoplamiento 11Mbps. ?El hecho de que trabaja en todos en estas condiciones, es un testamento a la calidad del equipo! La primera cosa que usted necesita el lanzamiento de apuro es el acoplamiento s? mismo. Si usted no tiene l?nea de la vista de radio, su acoplamiento actuar? como esto. Apenas porque usted puede ver el otro lado del acoplamiento no significa que trabajar?. Usted necesita poder al claro la 1ra zona de Fresnel por el 60% o usted debe apenas olvidarse de ?l. Los ?rboles, los edificios peque?os, el etc. pueden causar esta interferencia. Un an?lisis apropiado de la trayectoria se debe realizar por altamente haber calificado, (y) el ingeniero probablemente costoso. ?ste es su primer paso y no debe ser pasado por alto. Esto que prueba se determinar? lo que usted puede lograr y qu? clase de n?meros usted debe conseguir. Una vez que usted tenga eso, despu?s usted puede preguntar d?nde los n?meros deben estar. Iba a sugerir la comprobaci?n de las conexiones para saber si hay agua y da?o tambi?n, que ser?an m?s baratos, pero soy muy dependiente de trabajo y si su problema est? en el acoplamiento, no importar? lo que usted hace a los cables y a los connetors. Buena suerte, John

Bronze

Re: Degradacion de Enlace punto a punto con Aironet 1300.

Also in English....

Greetings,

Yes, your link is terrible!

You have very exccessive retries, this should be less than 10 % on an ideal bridge link. I always try for less than 2%.

It would be difficult to say where these numbers should be, since I have no idea about your

bridge link and the path it takes or the obstacles in place, etc...

However, a generic explanation can be surmised this way: dBm values are reflected in a negative integer such as -65dBm.

If you look at a number line with 0 in the middle (think of an outdoor thermometer), the positive numbers go to the right of the 0,

and the negative numbers go to the left.

The noise floor is going to be located all the way to the left. The object is to have your signal as far away as possible from the left side.

For example, the point where the equipment stops working at 11Mbps is about -86 or somewhwere in there and it might be higher at -80,

depending on who makes it. The signal has to be at least 25 and preferably 30 dB away from the noise floor of your particular equipment to have an

reliable link. According to your test, your signals are at -79, -81 and -86 on most tries. This is why the radio is transmitting at 5.5Mbps and all the

way down to 1Mbps, because it cannot sustain an 11Mbps link. The fact that it works at all in these conditions, is a testament to the quality of the equipment!

The first thing you need to trouble shoot is the link itself. If you do not have radio line of sight, your link will act like this. Just because you can see the other side

of the link does not mean it will work.

You need to be able to clear the 1st Fresnel Zone by 60% or you should just forget it. Trees, small buildings, etc. can cause this interference.

A proper path analysis should be performed by a highly qualified, (and probably expensive) engineer. This is your first step and must not be overlooked.

This testing will determine what you can accomplish and what kind of numbers you should be getting. Once you have that, then you can ask where the numbers should be.

I was going to suggest checking the connections for water and damage as well, which would be cheaper, but is very labor intensive and if your problem is in the link,

it will not matter what you do to the cables and connetors.

Good luck,

John

New Member

Re: Degradacion de Enlace punto a punto con Aironet 1300.

Hi

The field (Quality %) indicates the quality to me of the radius and that value is ideal?

The field (Retries) must be minimo What is it meaning? Rates (Src/Tgt) 1Mb 3/0 2Mb 22/20 5.5Mb 75/80.

there are other commandos to verify the good connection of the radio link and in which link of Cisco I can find all this.

Thanks

New Member

Re: Degradacion de Enlace punto a punto con Aironet 1300.

hello, you can send the original message to me without translating, is that the translation is average.

I want to know that it means each field of the test.

Thank.

Bronze

Re: Degradacion de Enlace punto a punto con Aironet 1300.

Hello again,

Sorry I have been working way too much...

OK - The left top corner of the field is the status of the link test. All of yours are 'poor', which is very not good. Although, the link never quite fails which means there is hope!

The 'time' column where it breaks up in to min, max and avg, is the amount of time in ms a packet took out of the 100 you sent. yours have been averaging 4 to 5 ms but some take as long as 20ms.

The 'strength' column is the key here.

you show three signal strengths, min max and avg. (The min, max and avg. rows go all the way across so they apply to all columns.)

your best signal was -79 your worst one was

-86. (remember the closer to zero the better the signal)

-79 is not a good enough signal strength to maintain a good 11Mbps link so it throttled down to 5.5, 2.0, and 1.0 Mbps to stay connected. Those columns show you how many packets went at 5.5 (which were the majority) and so on.

These values were found under 'IN' meaning the radio that the radio you sent that config from was recieving those low signal strengths.

Notice on the 'OUT' they are much better, the problem is that the other radio is having the same recieve values recorded.

Quality is usually in percent. I have always asked the question percentage of what? Nobody can answer that. I understand that the quality of the signal strength has to be good as well since it is possible to have good signal strength and bad signal quality. This would be indicative of a multipath situation or some other anomily. You need to work on getting the signal strength up.

I hope I have answered your questions, but I'm going from memory here which is leaky and rusty these days and I have a medical need for coffee at the moment.

Be well -

New Member

Re: Degradacion de Enlace punto a punto con Aironet 1300.

i'm sorry

hello john,

which is the optimal value for (poor)?

which is the optimal value for (retries)?

thankyou very much.

Bronze

Re: Degradacion de Enlace punto a punto con Aironet 1300.

The optimal value for 'poor' is 'good'

The optimal value for 'retries' is between 2% and 5% but you will not know how good you can get it until you do the survey.

543
Views
0
Helpful
10
Replies
This widget could not be displayed.