Entrance communication system

Details Entrance communication system Entrance communication system

1989-10-24

1991-09-03

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379103, H04M 1100

Patent

active

050460838

ABSTRACT:
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.

REFERENCES:
patent: 3917911 (1975-11-01), Lesher
patent: 4113986 (1978-09-01), Clement et al.
patent: 4338493 (1982-07-01), Stenhuis et al.
patent: 4436958 (1984-03-01), Hansen et al.
patent: 4644104 (1987-02-01), Middlemiss
patent: 4764953 (1988-08-01), Chern et al.
Trell, Int'l Patent Classification H04M 11/02 Int'l Publ. No. WO 87/00378, Jan. 15, 87.

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