Registers – Systems controlled by data bearing records – Time analysis
Patent
1986-01-24
1989-01-31
Trafton, David L.
Registers
Systems controlled by data bearing records
Time analysis
235449, 235454, 235472, 235487, 34082552, G06K 710
Patent
active
048017868
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a checking system having at least one stationary check point and a central data collector, which is associated with the check points, for verifying the individual check points, an identification being allocated to each check point. In addition, the invention deals with a method for verifying check points in a monitoring system, the verification including an item of time information and an identification associated with the respective check point.
It is known that checking systems of the abovementioned type are extensively used for protecting buildings or sections of buildings to a large degree against break-ins or unauthorised entering, especially outside the usual business hours.
Whilst, for example in the case of residential houses (that is to say with small easily checked objects), in most cases electronic alarm systems are used which operate automatically, a check by guard personnel is customary in the case of larger objects such as a factory, a refinery, a bank and so forth. Several systems or methods are known which can be classified under the two terms "check by watchmen" and "protection by watchmen".
In the method of the check by watchmen, the time clock known for a long time is used. At each of the check points arranged at several places of the object to be secured, a keybox contains a key, the key bit of which is mechanically coded and identifies the respective check point. The key is inserted by the watchman into the time clock which then records, by means of a printing mechanism, the time, the date and the number of the check point, that is to say the number of the key, on a check strip.
The essential feature is in this case that the watchman checks the individual check points, as also expressed in the keyboard "checking by watchmen". However, this checking is associated with considerable disadvantages.
A continuous, reliable monitoring record, which can be rapidly evaluated, is demanded by more and more firms and also by the insurance companies. But the check strip, which can be several metres long in the case of large objects which are to be monitored and which have many check points, to be called at at time intervals, is difficult to evaluate and read. This leads to the fact that the check strips of the time clock are frequently deposited unread. The control strip is used and checked only when a case of damage or an insurance case has actually occurred.
It is possible to check the checking round of the watchman only after the watchman verifies the check points on a prescribed route and has subsequently handed over the time clock containing the check strip at the central station. During the walk along the route itself, therefore, no contact exists with the central point. For this reason, it must be considered that the guard personnel, which is frequently exposed to dangers during the checking rounds, are inadequately protected.
In addition, the security against deliberate manipulations must be graded as very low with the method of checking by watchmen involving the mechanical time clock and the check keys. With some skill, it is quite easily possible to simulate the verification of a check point without the watchman actually having called at the checkpoint. This is because it is not particularly difficult to copy a check key so that, for example, an external check point can be passed by and the verification can be simulated by means of the substitute key. The low security against manipulation can therefore lead to inadequate protection because of checking routes not being completed.
Finally, the number of possibilities of mechanically coding the key bits is limited and with a customary system, at present only 999 different keys, that is to say check points, with the appropriate numbering are possible. Although this may be adequate with individual systems, it can happen with several locally separate plants having the same system that one key having a certain number exists several times overall. In such a case, for example, a check key from Northern Germany could be use
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