PMN operate in the UK with an Ofcom Low Power Guard Band license using frequency 1781.7 to 1785 paired with 1876 to 1880MHz and with MNC (Mobile Network Code) UK19 and operating at a maximum power of 200mW. The same spectrum is now available in the Netherlands and Sweden using in-country MNC.
Guard band is the term for the unused part of the radio spectrum between adjacent radio bands. Originally created for the purpose of preventing interference, this narrow frequency range is used to separate two wider frequency ranges to ensure that both can transmit simultaneously without interfering with each other.
In the UK, by utilising the guard band spectrum licensed by Ofcom to TeleWare in May 2006, PMN enables companies to build a private GSM campus network to carry GSM traffic between mobile phones used within the campus and from mobile phones across intra-site IP networks and, therefore, without incurring mobile operator call charges.
The applications for Guard band spectrum extend beyond the immediate one of reducing call costs for on-campus mobile phone usage. Many enterprises have mobile users that are small office or remote location workers, and PMN also provides a solution for those who do not have sufficient signal for mobile use.
Guard band spectrum solutions operate at a lower frequency so are less power hungry, providing both a green alternative and less drain on the mobile phone battery. It also has less likelihood of experiencing interference with other electronic signals making it suitable for use in retail and industrial areas where other equipment may be in use.
Outside of the UK, PMN will operate with third party operators of guard band spectrum.