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Trunked Systems
Delivering the first ever true MPT1327 system to BT back in 1986 this was installed on the Post Office Tower in London. This was closely followed by the first multi-site trunked radio systems.
Today, we work with Fylde Micro Ltd and are successfully utilising networks with a 3rd generation product to meet modern day voice and data communications challenges.
Multi-channel radio systems need to be planned properly if they are to be efficient. This is even more important if the systems include multiple base stations and have a large number of mobile radios as shown in the picture.
There are many criteria that need to be considered when designing a radio system. These include deciding:
- the number of handhelds and / or mobile radio users
- whether users will be grouped, e.g. managers, drivers, staff, security, and cleaners
- the typical radio activity of each group of users, e.g. low (5%), medium (25%), and high (50%)
- whether the low radio activity of individual groups may enable them to share a single channel
- whether higher radio activity groups will require their having a single dedicated channel or perhaps multiple dedicated channels, e.g. to ensure that a vacant channel is available immediately if required
- whether it is essential for groups with their own channel(s) to be able to communicate with groups on other channels, e.g. all-call messages during an emergency.
The problems with some multiple-channel multiple-site systems include:
- the system is not spectrally efficient, e.g. more channels are used than necessary (NB: also resulting in the licensee paying higher fees than necessary)
- groups of users may not be able to communicate with all other groups
- all channels transmit simultaneously when one channel is accessed.
Spectrum efficiency may be enhanced by using a trunked radio system. Trunked radio systems are based on access to a pool of radio channels. This system includes the following benefits:
- the use of comparatively lower number of channels required more closely matches the probability of calls being made and the duration of those calls (using Erlang B theory), e.g. fewer channels may be needed for 100 short calls within an hour compared with 25 long calls, and probably many fewer than each user group having its own channel(s)
- a control channel (CCH) manages access to the traffic channels
- a free traffic channel (TC) may be accessed by any user immediately
- the control channel can become a temporary traffic channel during peak activity
- a well planned 7-channel trunked system may accommodate 3000 mobiles.
Trunked systems can vary in size from on-site to wide-area multi-site. Multi-site systems may be connected using cable, fibre, or microwave links. The control channel frequencies at each site will be different. This enables a mobile radio to automatically establish the strongest, and usually nearest, base station and communicate through it. This method should ensure that the mobile remains within range of the base station for the duration of the call.
There are digital system equivalents to the analogue trunked system standard (MPT1327).
Wall to Wall Radio Communications will be pleased to discuss your multi-channel radio system requirements and design, install, commission, demonstrate, and maintain the best analogue or digital solution to meet your requirements.
Recent News
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Stunning modern style Icon Hotel on Oxford Street
Offering a cutting edge contemporary design in the heart of London where Oxford Street meets Park Lane is the spectacular Cumberland Hotel with its spacious lobby creating a striking first impression with modern, original art and lighting. Every feature is beautifully considered at this iconic Hyde Park hotel, from the unique Jimi Hendrix Suite to London’s finest restaurants and bars.
Head of Security approached our Bespoke Systems Design team to discus their exact requirements. It was imperative that clear and concise signal was present 24 hours a day to enable staff to perform emergency evacuations as well as having overall coverage of the 1019 bedrooms on all floors. Equipment supplied needed to meet strict specifications and had to be rugged and perform in any of the 6 lifts within the hotel. As meeting rooms are situated on the lower ground floor a full site survey was undertaken during the quotation process. A digital system was to replace the outdated analogue kit.
During radio trials it was evident that the digital signal was able to access all areas and the client was more than happy with our recommendations of the well designed Hytera PD705 hand portable radio to form part of the overall on-going upgrade.
If you would like further information on how we could help you deliver slick and secure operations then contact us at Sam@walltowallcomms.co.uk or call our effective sales team on 020 8770 1007 -
Haunch of Venison Gallery, New York and London, combines with Christie’s Private Sales
Haunch of Venison Gallery, a contemporary art gallery based in London and New York representing and exhibiting some of the world's leading artists has combined with Christie’s Private Sales in order to offer clients the benefit of their combined global reach and expertise.
After the recent Christie’s King Street site radio communication upgrade to a new state of the art digital radio system, the client was enthused enough to add the Haunch of Venison Gallery site to their digital portfolio.
Wall to Wall Radio Communications bespoke systems team have successfully deployed an IP link of the Hytera Digital radio communications system between King Street and Bond Street.
The management selected the small, robust, Hytera X1p full keypad radios with bespoke programming for this upgrade, in keeping with the ethos of the Galleries sleek design.
We’re proud to add this gallery to our portfolio and to continue the improvement of their sophisticated radio communications systems to the group.
If you would like further information on how we could help you deliver slick and secure operations then contact us at Sam@walltowallcomms.co.uk or call our effective sales team on 020 8770 1007 -
Team Sport has 11 tracks across the UK with all radio systems supported solely by Wall to Wall Radio Communications Ltd.
Managing Director Sam Cohen of WTW happened to be on a team building evening in Crawley a few years ago and noticed how poor the radios were performing. Before he even jumped in a cart, his sales patter kicked in and a meeting secured the following week. Did Sam win that night, no, he was on crutches!!
What followed has been a successful partnership providing specially designed noise cancelling ear defenders, body harnesses and Motorola radios to perform to the high specification that was required to operate in a noisy environment but keeping Health and Safety at the forefront.
Future proofing alongside Team Sport we are currently deveoping new business ideas to create a great experience for the driver and supporters. Watch this space!
http://www.team-sport.co.uk/news/london-loves-teamsport/
http://www.team-sport.co.uk/?gclid=CJCEy5jQyrcCFYuR3godkF4Aag -
Compact and rugged radio system deployed for Byrne Bros
A new, compact and rugged radio system successfully deployed for Byrne Bros by WTW Bespoke Systems Team!
With Health & Safety paramount on construction sites, it’s important that credence is given to effective communications.
Byrne Bros (Formwork) is one of the UK's premier concrete frame contractors. A leader that has built its reputation on the skill of its people, the trust and integrity of its many long-standing clients, its talent for innovation and passion for perfection.
Wall to Wall Radio Communications were appointed to install a system for Byrne Bros whilst working on site at another of their clients, Imperial College.
This had to meet a standard to ensure coverage in a difficult area of construction. Although using analogue radios, a mixture of Icom and Motorola, these have been programmed with the complex functions of encoding and call functions.
The system enables users to work in difficult areas of the college whilst ensuring their safety and professionalism to the highest standard as expected by all parties.
We’re proud to be the approved supplier of radio communications equipment for Byrne Bros and look forward to a long and continued association. If you want to find out more about how we could help you deliver slick and secure operations then contact us at info@walltowallcomms.co.uk or call our effective sales team on 020 8770 1007
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