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# Erlang to kbps conversion

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Posts Sunil
Guest

In the Erlang and VoIP Bandwidth Calculator, what is the significance of the Voice Paths option. Secondly I want to calculate the total kbps required for 1Erlang of Voice Traffic using a 8kbps Voice codec, 20msec Frame and blocking of 0.01%.What is the formaul to calculate? Technical Support
Guest

Voice Paths are the number of voice channels available in the system.

If you look in the Technical Papers area of this site, you should get some tips regarding your calculation. veera hariandja
Guest

CMIIW

voice codec = 8 kbps = 8000 bps
TTI per frame = 20 msec = 0.02 sec
duration of busy hour = 1 hour = 3600 sec

1. Based on Table Erlang B, Voice path options for 1 Erl with blocking 0.01%, N = 7 path options

2. Data erlang =
(total number of frames transmitted * TTI per frame)/Duration of busy hour

1 Erl = (x * 0.02)/3600
x = total number of frames transmitted = 3600/0.02 = 180,000 frames

y = total number of kbps transmitted = 180,000 * 8 kbps = 1440 Mbps Bob
Guest

Hi Guys,
very interesting topic,
I am trying to calculate Erlang from NB interface to see how much POI Erlang is transited. but I got a bit confused please take a look
Codec= AMR, Frame=Ethernet, BSC and POI are TDM base and NB over IP-
12200*(20/1000) = 244 bits means–> 31 bytes —
Ethernet =38, IP=20, UDP=8 , RTP=12 , NBUP=4 , VOICE=31 BYTES Total Bytes for AMR=117–> 117*8*50=45.2kbps- Number of ephemeral channel = Occupied BW/45.2kbps now if we consider the occupied BW is 90.4Mbps then number of ch=20k my concern is this, how do I obtain Erlang from it? Bob
Guest

I found answer to my own Q:
Bandwidth estimation for a connection using compressed speech can be calculated by Activity Factor (AF) as follow
BW=AF×bitrate(Speech)+(1-AF)×bitrate(Silence)
Where
BW=Bandwidth on L2 Layer
AF=Percentage of Activity Factor–>(1-AF) =Percentage of Silence
Bitrate
On IP Backbone (MPLS) Link Layer:
Where
TX Rate= Transmission Rate/ Packetization
Ex: A Speech Call on NB with AF=60% and using AMR 12,2 mode consume a following bandwidth (Ethernet + VLAN)
BW=(60*46.8kbps+(100-60)*4.6kbps)/100=29.9kbps
where
bitrate(Speech)= (35+40+42 bytes)* 50/s=46.8kbps
bitrate(Speech)= (9+40+42 bytes)* 6.25/s=4.6kbps
Now if occupied BW=46,8M then Virtual Channels = 46,8m/46.8=1000
For Calculating Erl we need number of channels and GOS- so very easy Carried Erlang is obtained–>ErlangTraffic(N,GOS) where GOS=.001 prabhu
Guest

how to convert erlang to bitrate on Iu interface.actually Iu-PS interface Ommah
Guest

In order to covert a traffic in Erlang to Mbits, you can use the below:

First of all, you have to convert your traffic from Erlang to Minutes@Busyhour. This can be done by multiplying the traffic in Erlang by 60.

You have two types of services with a traffic in Erlang: CS voice and CS video

For the voice:
(Traffic_Minutes@Busyhour x 60 x EBR) / (3600 x 1000) = xxx Mbit/s@BusyHour

Where EBR is the Equivalent Bit Rate for the service. Usama
Guest

I have total Erlangs for GPRS/EDGE traffic for a network…How can i calculate the equivalent Mb traffic for this data traffic. aseem
Guest

I know Voice MoU per subscriber in a circle – how do I CONVER this to data in mbps or kpbs?

I am trying to find out how much data can one BTS handle , and how many subscriber 1 BTS can handle both voice and data?

I want to predict number of small cell solutions that can be deployed in a densily populated area? MG
Guest

CMIIW

voice codec = 8 kbps = 8000 bps
TTI per frame = 20 msec = 0.02 sec
duration of busy hour = 1 hour = 3600 sec

1. Based on Table Erlang B, Voice path options for 1 Erl with blocking 0.01%, N = 7 path options

2. Data erlang =
(total number of frames transmitted * TTI per frame)/Duration of busy hour

1 Erl = (x * 0.02)/3600
x = total number of frames transmitted = 3600/0.02 = 180,000 frames

y = total number of kbps transmitted = 180,000 * 8 kbps = 1440 Mbps

y = total number of kbps transmitted = 180,000 * 8 kbps = 14,400 Mbps et non 14400 Mbps
X=180000
Y=180000 * 64 kbps = 11,52 Mbps
64 & gos 0,01 y= 23, 040000
Y=28,8 si gos = 0,01 et voice =8 .

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