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Entrance communication system
| Details |
Inventors: Trell, Anders E.;
Assignee:
Primary Examiner: Ng; Jin F.
Assistant Examiner: Woo; Stella L.
Attorney, Agent or Firm: Fleit, Jacobson, Cohn, Price, Holman & Stern
An entrance communication system including a programmable number discriminator, arranged to perform an automatic dial-up operation via the public subscriber telephone network to selected subscriber telephone set when addressed from an entrance set, and to establish voice communication therebetween, preferably also accepting control instructions sent as digits from the called party. At least one local communication circuit is included for direct communication between the entrance set and at least one dedicated reply set, which is not connected to the public subscriber telephone network. At least one dedicated reply set is preferably arranged connected to gain access to the line access and dial-up function for establishment of alarm calls or other telephone calls via the public subscriber telephone network. Furthermore, at least one dedicated reply set is preferably arranged connected to gain access to the programming function of the system, and to facilitate reprogramming of the system by pulse code or MFC-signals entered as dialled information from the reply set. |
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DETAILED DESCRIPTION It is a primary object of the present invention to provide a solution to the above disadvantages by providing directly addressable local communication circuits in an entrance telephone system of the type which is intended for communication via the public subscriber telephone network, connected to dedicated reply sets in series or in a loop using pulse code techniques for transmission, or (preferably and as described) using individual parallel circuits.
It is a further object to obtain such a feature at a low cost, since the number discriminator, logic circuits and other parts can be shared, due to the fact that normally only a few entrance call intensive circuits will be required for each building, and such tenants will obviously accept the costs involved for the wiring of the local communication circuits and for the purchase of dedicated reply sets, but would on the other hand not be required to accept any call charges.
The fact that an incoming call is an entrance call is noted immediately, since ring signals are obtained from the dedicated reply set.
All types of signalling influencing the entrance door lock or other control signals can obviously be sent via the local communication circuit from the dedicated reply set in the same fashion as via the public telephone network.
Still a further object is to provide the capability to have the conventional telephone number for a tenant connected to a local communication circuit programmed for access via the public telephone network, whereby a tenant can be reached in "both ways".
A further object is to provide distant reprogramming of the system from a dedicated reply set, a facility which can not be accepted with maximum security from a subscriber telephone set connected to the public subscriber telephone network.
The entrance set can, as before, include all previously known functions, e.
g.
code lock access and alarm.
The local communication circuits may also be of wide band type, in order to facilitate video communication, if desired
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Telecommunications 
