Grade of Service

This topic has 124 replies, 1 voice, and was last updated 4 years, 6 months ago by Althaf.

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10th February 2006 at 17:37 #33420

tufail
Guest

thanks.

that is a valuble data.

i want to make it more interesting in calculating no. of erlangs per sub per hour.

TCH load per subscriber
= [ # of call attempts per sub per hour*%MOC + # of call attempts per sub per call*%MTC*(1-%no response)*(1-% no answer)*%MTC success] * mean call duration /
3600

example
1. number of call attempts (MOC+MTC) per subscriber per hour 1.1
2. percentage of MOC 60%
3. percentage of MTC 40.0%
4. no answer from a mobile subscriber 13.5%
5. no paging response 32.5%
6. successful MTC 54.0%
7. mean call duration (MOC/MTC) 115 sec

if now calculate erlang per subscriber
=[ 1.1 * 60% + 1.1 * 40% * (1-32.5%) * (1-13.5%) * 54%] * 115/3600
= 0.026 Erlang

hope this is useful
thnks n regards
tufail

10th March 2006 at 02:18 #33421

Maca
Guest

Hi, if anyone of you has an erlang b table in excel format, kindly send it to celmacatiggay@yahoo.com.

Many thanks! =)

11th June 2006 at 13:11 #33422

sandeep
Guest

Can anybody tell me how to calculate the percentage load on the signalling link set if i have the following parameters
(1)No of MSU Transmitted
(2)No of MSU Received
(3)No of SIF/SIO Transmitted
(4)No of SIF/SIO Received
PL forward the formula on rajputmsandeep@gmail.com

3rd August 2006 at 10:21 #33423

BADHARUDHEEN
Guest

I am working for a Telecom organisation and I would like to know How to Calculate BHCA of a PABX or Network switch.

Early reply shall be highly appreciated.

15th August 2006 at 09:48 #33424

Munuddin
Guest

Our PABX normaly static traffic Capacity 36000 BHCA against 1536 port/ terminal.
But,how many the dynamic traffic capacity against 1536 terminal/port? and what is the procedure traffic(BHCA)calculation?

With thanks

Mynuddin
Bangladesh

21st August 2006 at 10:50 #33425

hussain
Guest

hi every one. i want to know about telecommunication. i want to start calling cards business in italy but i do not know how can i start it? can you any one help me in ths matter? thanks
khalidbutt1@gmail.google.com
00923456481835

23rd August 2006 at 10:37 #33426

ramesh
Guest

Assume 0.05 Erlang per PSTN subscriber.
3000 Subscribers generate 150 Erlang requiring at least 6 E1 Trunks(180 channels of 64 kbps)required for non-blocking on circuit-switching

If the traffic is transported over IP, what shall be the bandwith required in KBPS ??

Is there any formula please?? Thanks.

24th August 2006 at 14:26 #33427

Cerebrum
Guest

Hi, Ramesh!
First, there isn’t an exact formula for calculating the needed bandwidth. It depends on the VoiceCodec that you will use.
G.729 is very good VoCodec if you choose it that will cost you about 26.4 kbps (PPP) or 29.6 kbps (Ether) for every channel in TDM. In you case 180*26.4=4.752Mbps
But that is not constant, bandwidth is adjustible. It consist of:(Example is with G.711)
1.Size of the sample (e.g. 80B)
2.IP Header (e.g. 20B)
3.UDP Header (e.g.12)
4.RTP Header (e.g.8B)
———————–
Total:120B per packet
The sample rate is 100pack/s (10ms per packet)
so the calculations are: 120*8*100/1000=80 kbps per one call
But if you put two samples in one packet you will save about 16kbps (When you increase the number of samples per packet, you also increase the amount of delay
on each call.DSP resources, which handle each call, must buffer the samples for a longer period of time.)

Second, you must consider that your subscribers not only generate calls, but also receive ones. Consider this.

P.S. If you provide me you e-mail I could send you one document about that problem.
Best Reagards

24th August 2006 at 16:07 #33428

Vanderley
Guest

Hi Cerebrum,

Could you send it to me also?

vanderley.mail@gmail.com

Tnx in advance

25th August 2006 at 10:08 #33429

ramesh
Guest

Thanks a lot Cerebrum..
Awaiting your document..

r.ragoo@mauritiustelecom.com

28th August 2006 at 14:57 #33430

Barry
Guest

I am looking for the R2 signaling for Bangladesh… Can anyone help me

18th October 2006 at 16:17 #33431

Fliz
Guest

Hi,
Can i know how to calculate the number of E1s needed from my switch to my prepaid platform,if i have a subscriber database of 50,000 and a BHCA of 24000

11th April 2007 at 05:57 #33432

asad
Guest

Can anybody tell me how to calculate the percentage load on the signalling link set if i have the following parameters
(1)No of MSU Transmitted
(2)No of MSU Received
(3)No of SIF/SIO Transmitted
(4)No of SIF/SIO Received

11th April 2007 at 21:35 #33433

Ki
Guest

Link Load = ((MSU*6 + SIO/SIF Octets)*8) / ( 64000*3600)

Assumption that the measured values are taken in Hour and it is a low speed link.
Using 64000 instead of 65536 is also the correct way.
Calculate your load per direction.

19th April 2007 at 11:29 #33434

vadan
Guest

Hi all,
I am Vadan from India, working for a CDMA service provider. Recently we have ordred Huwavi IP Switch and they have sent their call model.
There are few terms which i have heard first time. ONe of them is
Integrated BHCA. To find BHCA we used formula BHCA = Total (Erlang/Erlag per sub)*BHCA per Sub
Traditional TDMA network formula.
Can anyone help me to find IP BHCA formula if i have followng data
BHCA per sub; 2.23
Erlang per sub: 35mEr
Total Erlang capacity: 20000
Average holding time: 56.30s

I would also like to know what is redundancy BHCA ?

thanks
with r’gds
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