MPT 1327
MPT 1327 is an analog trunked radio -Netzstandard, in 1988 in the UK by the British Radiocommunications Agency for use in the voice was developed.
The channel bandwidth can be 12.5 kHz or 25 kHz.
There are several permitted types of calls:
- Two-way connection
- Hunt group and fixed group calls
- Group call through sequential subscriber call
- Diversion
- Priority connections
- Emergency calls
- Data transfer
Situation in Germany
Even before the introduction of the GSM networks, various countries had national or regional analog trunked radio networks in operation based on the MPT-1327 standard. There were several providers in Germany, of which Deutsche Telekom , which marketed its trunked radio systems under the name Chekker , was the largest.
See also: paging network # Chekker
When planning, the legislature had a regional network in mind - as a demarcation from the existing C-network . In the long term, however, regionality was also the network’s biggest problem. On the one hand, a separate application had to be made for each economic region. Many A4 files with expensive planning documents had to be submitted. On the other hand, when the user sent his vehicles to another region (e.g. to the construction site there), the radio devices had to be reprogrammed with the radio channels used there. An additional usage fee was then due for the additional region. Roaming, as is common in cellular telephone networks, did not exist. While trunked radio was still competitive in comparison with the C network, the fall of the charges in the D network quickly came to an end for many network operators. The operating companies changed very often. Centralization began and the last - at that time nationwide - operator was called Dolphin Telecom . He tried to convert to digital trunked radio. When the Federal Network Agency refused to switch to a US radio telephone standard , the Canadian investor withdrew from Europe. The operating company was wound up and many radio networks were switched off.
Some sub-networks were kept in operation by local operators and are still in operation today. The e * Dispatch Professional Mobile Radio GmbH ( e * Dispatch ) has been operating a successful trunked radio network in Berlin and large parts of Brandenburg since 2005. Users include transport companies, suppliers and disposal companies, authorities, ambulance and taxi companies, security and courier services as well as towing and container services.
There is another operator, ProRegio Bündelfunk GmbH & Co KG, in Baden-Württemberg, whose network extends to Switzerland (greater Basel area). In autumn 2005 the company took over the network of Dolphin Telecom Germany. The focus here is on public transport, the supply of factory premises and other professional applications for security services, municipalities (local police or KOD) and airfields.