Home » Topics » Telecom Design » 1 E1 in erlang

Pix Guest

Hello,

This post answers a thread that has been closed (too many posts maybe ?).

In 1 E1, you have 30 timeslots (= 30 channels). Therefore the offered traffic should be about 16.6 erl (with a blocking rate of 0.1%).

Pingo Guest

pix Guest

but only 30ts are useful…

Optimizer Guest

the remnant two are also useful [signaling].

pix Guest

of course, they have a “use”, but they’re not useful for us, in the dimensioning.

Da Architect Guest

ts 0 for framing and ts 16 for signalling, sometimes in alcatel they use one more ts for signalling, which make us left with 29 TS for dimensioning.

confirm please!

RLTO Guest

Confirmed

it is according to your required blocking probability you need.

one may use;
1 TRX => 2 TS PCM
& Other use;
1 TRX => 2.25 TS PCM
Or even 2.5.

which is your option ??

pix Guest

Da architect,

Maybe i’m wrong, but this might be the case when there are 2 abis links (main abis and secondary abis). One TS is reserved for communication with the second abis… but i might be wrong. I’ve no time to check it out, sorry 🙂

amit dobhal Guest

Hi,
would like to one E1 can contain how mcuh erlang traffic ??

thanks for answer in advance

regards,

Bijoy Guest

Hi Amit
1 E1 can support upto 15 TRX in TDM mode.

Considering a site with 5+5+5 conf,with 35 TCH per cell,you can have an Equipped Traffic of 26.4 *3= 80 Erl approx.

If you use HDLC,this figure will be higher.

Br\\
Bijoy

ARVIND Guest

HOW MANY ERLANGS ARE THERE IN ONE E1?

HOW TO CALCULATE UTILISATION OF E1

Tanuj Guest

Yes we use 16 and 25 TS for signaling when giving multiple E1 to a site e.g for implementing EDGE

vikas Guest

hiii pix
how u calculate 16.6 erlang??

A qodar Guest

how many pcm to support trafic of 3 erlang

N Guest

any one can show how to get 1E1 = 16.6 erl?