sesr

7/28/2019 SESR

1/8

Es & Seso The GSM network will fall under the local grade category; thus for on link from the

switch to the far end site limitations are as follows:

o Max allowed number of SES/month=31 sec. (SESR=0.00015%) (1-SESR =99.99985).

o Max allowed number of ES/month=31104 sec. (ESR=0.012) (1-ESR=99.988).

o If we consider that this link consists of 10 hops thus the limitations per hop are asfollows:o Max allowed number of SES/month=3.1 sec.

o Max allowed number of ES/month= 3110 sec.

#110-07-2004, 06:07 PM

M.Kamal ALFahel Posts: n/a

Hi Everybody,I have a radio route of length 200Km,consists of segments between 32Km and

20Km and to determine the SESRlimits I am using the formula: SESR=0.002(0.02

+ 0.01*(L/500Km))And for every segment I calculate the corresponding percentage of the SESR.

I got this formula from the Internet and I wonder if it's right to be used or not.

Thanks

M.Kamal ALFahel

#212-21-2005, 12:52 PM

Hossam_El_MeadawyMember

Join Date: Oct 2005Location: Cairo, Egypt.Posts: 99

Es & Seso The GSM network will fall under the local grade category; thus for on link from theswitch to the far end site limitations are as follows:

o Max allowed number of SES/month=31 sec. (SESR=0.00015%) (1-SESR =99.99985).

o Max allowed number of ES/month=31104 sec. (ESR=0.012) (1-ESR=99.988).o If we consider that this link consists of 10 hops thus the limitations per hop are as

follows:
http://www.pathloss.com/forums/showpost.php?p=572&postcount=1http://www.pathloss.com/forums/showpost.php?p=1130&postcount=2http://www.pathloss.com/forums/member.php?u=373http://www.pathloss.com/forums/member.php?u=373http://www.pathloss.com/forums/report.php?p=1130http://www.pathloss.com/forums/newreply.php?do=newreply&p=572http://www.pathloss.com/forums/newreply.php?do=newreply&p=572http://www.pathloss.com/forums/report.php?p=572http://www.pathloss.com/forums/showpost.php?p=1130&postcount=2http://www.pathloss.com/forums/member.php?u=373http://www.pathloss.com/forums/showpost.php?p=572&postcount=1

7/28/2019 SESR

2/8

o Max allowed number of SES/month=3.1 sec.o Max allowed number of ES/month= 3110 sec.

Hossam_El_Meadawy

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#301-03-2006, 08:42 AM

Abdul S. DurraniJunior Member

Join Date: Dec 2005

Location: CanadaPosts: 7

G 826 Calculations

Quote:

Originally Posted by M.Kamal ALFahel

Hi Everybody,I have a radio route of length 200Km,consists of segments between 32Km and

20Km and to determine the SESR limits I am using the formula: SESR=0.002(0.02+ 0.01*(L/500Km))

And for every segment I calculate the corresponding percentage of the SESR.I got this formula from the Internet and I wonder if it's right to be used or not.

Thanks

Hello Kamal: This is me Abdul S. Durrani. For the hop links you have, do not use 500but use 100 for each segment. For example 32/100, and 20/100 and 0.02 can also

be .01 ( 1 % to 2 %). Remember my courses notes. Please make the changes.

I wil send you a calculator so you can quickly do these ITU G 826 objectives. HappyNew Year.

Abdul Durrani

Abdul S. Durrani

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#4
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7/28/2019 SESR

3/8

03-01-2006, 03:18 PM

KamalJunior Member

Join Date: Oct 2005Posts: 13

Reply to Mr.DurraniHello Mr.durrani

did u check the date I sent my question?

any way I'll still wait for the calculater

B.R

Kamal

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#502-15-2008, 04:33 AM

bashiJunior Member

Join Date: Feb 2008Posts: 1

MannualHI All Path Loss users

can any provide me with the PL4 mannual.my email id is given below if u can sendthrough email

Thanks & BR

Mubashiremail : [email protected]

bashi

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#102-07-2003, 07:29 PM

Rejean GosselinJunior Member


What is the best way to determine the climatic factor (cf) in the Barnett & Vigantsreliability formula? Not the C Factor!

Standard values seem to vary from 0.5 to 1 and 2.

How can we determine the exact value depending on the climatic conditions of a

specific area?

I am especially looking for many areas in the province of Quebec in Canada.

Where can I find a climatic factor map?

Thanks!

Rejean Gosselin

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5/8

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#202-17-2003, 08:01 AM

Lars H-L

Junior Member

Join Date: Oct 2005

Posts: 13Vigants-Barnett reliability method

Maybe maps for the climatic factor cf do not exist (are not published). Then use

instead the C factor with associated maps. The C factor is also by definition equal to cf

for average terrain rouhness S = 15.2m

For a more detailed calculation you can use one of the newer ITU-R P.530 reliabilitymethods. These are applicable worldwide.

Regards,

Lars H-L

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#302-17-2003, 12:52 PM

Rejean Gosselin

Junior Member

Join Date: Oct 2005

Posts: 4Climatic factor

Thanks a lot Lars for your reply and your suggestion about the climatic factor forreliability calculation.

I only began to compare the ITU-530 methods with the Barnett & Vigants method.

Which method is the more reliable after you? 530-6 or 530-7/8 or the newest 530-9 ?

I get similar results when the path inclination is near 0 mr, but I get very different

results when the path inclination is about 10 mr. What do you think about this?

Thanks a lot for your collaboration.

Rejean Gosselin

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6/8


#402-18-2003, 06:39 AM

mike Posts: n/a

climatic factorITU made a lot of changements over the last years for the recommendation P530.Therefore, if you are sure what kind of parameter set for the Barnett&Vigants is

correct for your area you can choose this model.

If you have no idea the P530-9 recommendation gives a detailed model where you

only need the data provided by ITU and the GTopo30 DTM from USGS to get the rightparameters. You do not have to look anywhere else. This model seems to be proved

with hundreds of hops all over the world. Nevertheless there will be a newrecommendation P530-10 soon. Let's see what will be new this time.

mike

mike

#502-18-2003, 12:13 PM

Lars H-LJunior Member


Reliability methodsRejean, here is my comments to the three ITU-R P.530 reliability methodsimplemented in PL4.

P.530-6(detailed planning)uses an average grazing angle which for many(most) paths

is ambiguous or even meaningless.

P.530-7/8 does away with this average grazing angle. Instead many link classes areintroduced, which makes it somewhat cumbersome, especially for coastal links.

P.530-9/10 (detailed link design)uses a terrain database (GTopo30) and the

refractivity gradient data are incorporated in PL4. This makes the method convenientin use, but the method itself and/or the PL4 implementation may be unreliable (see

the thread in this user forum initiated on Sep.13, 2002 by AK).

At present I regard P.530-7/8 to be the most reliable method.

Lars H-L

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7/8

#602-18-2003, 12:16 PM


Join Date: Oct 2005

Posts: 4

Climatic Factor...Thanks a lot Mike for your reply.

I will use both methods (Barnett & Vigants as well as ITU 530-9) and compare themon each link. Then I will probably be able to take a better decision.

Best regards!

Rejean Gosselin

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#702-18-2003, 12:34 PM



Climatic FactorDear Lars,

Thanks for your comments about each ITU method.

The main point I am wondering about is why the path inclination has such an effect onthe reliability result?

ITU 530-6 and 530-7/8 are the only two methods using this parameter.

I get 99.9999% compared to 99.999% if the path inclination is respectively 10 mr

instead of about 1 mr. Is it the reality?

Rejean Gosselin

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#802-18-2003, 01:48 PM

mike Posts: n/a
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7/28/2019 SESR

8/8

inclinationIn general a high low path is more reliable than a path without any inclination. The

reason for this is the less high probability for multipath with a certain inclination.

mike

mike

#912-19-2005, 07:24 AM

Hossam_El_MeadawyMember

Join Date: Oct 2005

Location: Cairo, Egypt.Posts: 99

Path inclination and ITU-RI would also like to say that I see version 7/8 more reliable than version 9/10 in the

clculation of the Geoclimatic factor, because in the calculation in 9/10 they refere to

the GTOPO 30 DEM wich proved to be very unreliable.and there is no dought that the path inclination in a very important parameter in the

calculation of the Geoclimatic factor.

Hossam_El_Meadawy

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