Free Erlang traffic calculators

The world's first online Erlang traffic calculators

Telecom Traffic Online
  Home | Free calculators | Products | Tech. papers | Forum | About us
A-Z termination - click here
A-Z termination - CLICK HERE
A-Z termination using H.323 and SIP
A-Z termination
  • VoIP softswitch

    DUAL Softswitch is a complete Voice over IP switching and billing solution.  Flat monthly rate.

    Web control panels; Least Cost Routing; Excel tariff uploads; SIP and H323 support.

    H323 SIP softswitch >>

  • VoIP calling

    Premium quality termination for wholesale carriers with their own VoIP switch.

    44Direct >>

    Our lowest rates for wholesale carriers with their own VoIP switch.

    44Mobile >>

    Our unique online callshop billing system.

    Bill My Calls >>

UMTS-GSM Guardband

Mazahir - 8th August 2017  (09:02 GMT)


Actually it depends on vendor and HW specification as well.

Because according to Nokia recommendation , there is Sandwich-type frequency allocation which allows even to use last 200 KHZ frequencies from each end as GSM TCH frequency (in 4.4 MHZ).



pix - 19th July 2013  (13:39 GMT)

ok, 850 *should* be the same. I'm quite sure the 3GPP did the same kind of study for 850 too, but it's for you to find it :)


Jason - 19th July 2013  (13:31 GMT)

Thanks Pix,
We are running both of these on 850.

I appriciate the help.

pix - 18th July 2013  (14:08 GMT)

hi jason,

My initial post was actually asking in which frequency band you werre working. I assume you're talking about GSM900 and UMTS900 co-existance ?

In this case, 3GPP said that a guard band of 300 kHz is enough. One GSM chanel = 200kHz, so you're fine if you keep 2 arfcn (400kHz) separation between the start/end of UMTS 5MHz bw and the first used GSM channel.

If you want to read : 3GPP TR 25.816

Maybe I'm wrong, but I think the operator for which I'm working for at the moment is only using 200kHz guard band. This has to be confirmed.


Jason - 17th July 2013  (22:00 GMT)

I have just heard from a friend that we should have 1Mhz between our GSM and UMTS frequencys.

Jason - 10th July 2013  (13:37 GMT)

Thanks Pix,
I dont really understand what your saying exacly. We currently would like GSM and UMTS on consecutive blocks of frequency with out any guard band between for example perhaps a 200 kHz guard band. I am not sure this would work. have you done this?

pix - 9th July 2013  (15:23 GMT)


UMTS 900 is located on the same band as GSM 900.

You have to dissociate the technology (UMTS) from the band being used (2100, 800, 900, ...)


Jason - 6th July 2013  (21:22 GMT)

I was under the impression that there needs to be a guard band between UMTS and GSM. Is this true or false?
Thanks in advance

Post a reply to this article

Name Enter your name.
Message Enter your message.
Email Optional -  If you enter your email address in this box, then you will automatically be notified if anyone replies to your message.  Your email address will only be published if you pay to post this message.
Please confirm you are human.
Press the button to post your message.
Home | Free online calculators | Products | Technical papers | Forum | Contact us | About us

Last modified: 17 May 2017

Copyright 2017. All rights reserved.