- ISDG basically limits itself to the prison sector.
Therefore the information is only available to government institutions / agencies and companies that are active in this sector.
Certain information (pictures/drawings/etc.) can refer to specific prison conditions and may therefore never be made public to the larger crowd.
That is why ISDG always verifies the contact information and position of those applying for information before passing on any kind of information.
- Several customers choose not to make their blocking projects public.
At request a limited reference list can be made available so that an individual contact with other national prison authorities can take place.
ISDG can assist you with this.
- Each prison is different; the same goes for the cost of the blocking. Local measurements of the area to be blocked are absolutely necessary for the making of a price calculation.
In order to support a budget request ISDG can give a minimum/maximum price indication on the basis of a short visit.
A specific price calculation can only be given after the measurement (reference measurements), the simulations and a technical calculation. All this requires 3 full working days + traveling times.
In certain cases ISDG is willing to pay for these costs.
The conditions are discussed individually.
- Several factors have an influence on the cost price. The total surface of the prison, for instance, only has a very limited influence.
More information regarding the costs is available.
- Each device can be installed as a stand-alone device. Optionally, ISDG can also add a remote monitoring system with which each system can be monitored from a distance.
Through the Internet – if necessary through satellite– each device can be put under monitoring.
- The bloc units and antennas are preferably installed externally, between the base station and the area to be blocked.
The present infrastructure is used for as far as possible: prison walls, fences, lighting –and camera poles, etc.
In exceptional cases additional infrastructure activities are required. For this ISDG makes an appeal to local companies.
ISDG prefers to work with a local installer who already has some experience in the prison sector.
Installation guidelines are available.
Depending on the specific competence of the installer he can be brought in to take care of the maintenance that is linked to the installation of the blocking devices.
- The cheapest solution is to connect the devices to the nearest electricity network. ISDG recommends, of course, the use of separate electricity networks and UPS (Uninterrupted Power Supply). This can easily be provided for in the construction of new prisons.
For prison buildings that already exist this is somewhat more complex.
ISDG can advise you in this matter.
- Nowadays all kinds of different techniques are offered to restrain the non-authorized communication from prisoners. A few examples are: detection, detection in combination with blocking and permanent blocking. On the basis of its experience ISDG chose the 100% permanent blocking (24/7) with an external installation of bloc units and antennas.
- Communication has to go through the telephone exchange so that it can be supervised. The prison regime is supposed to have some kind of inspection on this communication. The use of non-authorized wireless communication, however, makes this kind of inspection obsolete and allows the prisoner to communicate freely with the outer world. Thus, the inmate can stay in contact with the criminal environment and he can also continue his illegal activities.
Several articles from the press show that prison escapes, blackmail, killings, etc. could take place in this way.
- ISDG acts as guarantor for its permanent blocking technique which is in full compliance with the European law -and health regulations.
- Certain frequencies are solely allocated to network operators. The blocking of those frequencies is therefore in strict violation of the license conditions. The blocking of frequencies that are not exclusively allocated to network operators is not against the law.
Any form of broadcasting, as well as broadcasting blocking/jamming signals, is subject to certain approval procedures executed by the national spectrum management.
Several countries, however, provide for an exception for prisons.
Other applications are still prohibited in most countries.
ISDG can specify the situation for each country and, if need be, provide the authorized national agencies with the necessary information in order to persuade them to adapt their law.
The blocking of frequencies in prisons is subject to the following conditions:
1. The blocking is limited to the prison area - perimeter.
2. The blocking does not inflict damage upon the health of the people, neither in the blocked area nor in its vicinity.
- MOTSIB is short for MObile Telephone SIgnal Blocking. The system was designed in such a way that it blocked the signals of mobile phones (GSM) in prisons. Meanwhile, the MOTSIB system has evolved and became a system that is able to block all wireless communication on any given frequency.
- ISDG stands for Innovative System Developers Group, a Belgian company that is specialized in blocking wireless communication (MOTSIB)