Communications system
First Claim
Patent Images
1. A method of operating a communications system including a telecommunications link between a remote terminal and a control station, the method comprising:
- a) transmitting polling requests on a digital messaging channel carried on the telecommunications link, each polling request including a unique identifying code;
b) generating at the remote terminal a poll response message and encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code for the polling request;
c) returning a response signal from the remote terminal to the control station on the digital messaging channel; and
d) decrypting the poll response message at the control station.
1 Assignment
0 Petitions
Accused Products
Abstract
A communications system includes a telecommunications link (3) between a remote terminal (CPa-c) (such as a burglar alarm control panel) and a control station (1). Polling requests are transmitted on a digital messaging channel which is carried by the telecommunications link. The remote terminal (CPa-c) generates a poll response message which is partially encrypted and is returned on the digital messaging channel to the control station where it is decoded.
-
Citations
17 Claims
-
1. A method of operating a communications system including a telecommunications link between a remote terminal and a control station, the method comprising:
-
a) transmitting polling requests on a digital messaging channel carried on the telecommunications link, each polling request including a unique identifying code;
b) generating at the remote terminal a poll response message and encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code for the polling request;
c) returning a response signal from the remote terminal to the control station on the digital messaging channel; and
d) decrypting the poll response message at the control station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A communications system, comprising:
-
a) a control station including a polling request generator for generating a polling request including a unique identifying code; and
a decoder for decoding poll response messages;
b) a remote terminal including a polling response generator for generating a polling response message;
an encoder arranged to encode a part of the polling response message, said encoded part including the unique identifying code specific to a polling request; and
c) a telecommunications circuit including a digital messaging channel which, in use, carries polling requests from the control station to the remote terminal and carries said encoded response messages from the remote terminal to the control station. - View Dependent Claims (9, 10, 11, 12)
a digital messaging channel interface arranged to transmit and receive messages to and from the remote terminal on the digital messaging channel.
-
-
11. The system as in claim 8, wherein:
the polling request generator is arranged to generate a polling request for transmission on the digital messaging channel.
-
12. The system as in claim 8, wherein said control station further comprises:
a controller for interpreting the poll response messages.
-
13. A method of operating a communications system including a telecommunications link between a remote terminal and a control station, the method comprising:
-
a) transmitting polling requests on a digital messaging channel carried on the telecommunications link, each polling request including a unique identifying code;
b) generating at the remote terminal a poll response message and encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code for the polling request;
c) returning a response signal from the remote terminal to the control station on the digital messaging channel; and
d) decrypting the poll response message at the control station.
-
-
14. A communications system including a telecommunications link between a remote terminal and a control station, the system comprising:
-
a) a control station including i. a polling request generator for generating and transmitting polling requests, each polling request including a unique identifying code;
ii. a decoder for decrypting a poll response message received from a remote terminal;
b) the remote terminal including i. a polling response generator for generating a poll response message;
ii. an encoder for encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code of the polling request; and
c) a telecommunications circuit including a digital messaging channel for communicating polling requests from the control station to the remote terminal and poll response messages from the remote terminal to the control station.
-
-
15. A communications system including a telecommunications link between a remote terminal and a control station, the method comprising:
-
a) means for transmitting polling requests on a digital messaging channel carried on the telecommunications link, each polling request including a unique identifying code;
b) means for generating at the remote terminal a poll response message and encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code for the polling request;
c) means for returning a response signal from the remote terminal to the control station on the digital messaging channel; and
d) means for decrypting the poll response message at the control station.
-
-
16. A method of operating a communications system including a telecommunications link between a remote terminal and a control station, the method comprising:
-
a) transmitting polling requests on a digital messaging channel carried on the telecommunications link, each polling request including a unique identifying code;
b) generating at the remote terminal a poll response message and encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code for the polling request;
c) appending a keyed cryptographic has of the poll response message to the poll response message, said poll response message including a hash function identifier;
d) returning a response signal from the remote terminal to the control station on the digital messaging channel; and
e) decrypting the poll response message at the control station.
-
-
17. A communications system including a telecommunications link between a remote terminal and a control station, the system comprising:
-
a) means for transmitting polling requests on a digital messaging channel carried on the telecommunications link, each polling request including a unique identifying code;
b) means for generating at the remote terminal a poll response message and encrypting a part of said poll response message, the encrypted part of the poll response message including the unique identifying code for the polling request;
c) means for appending a keyed cryptographic has of the poll response message to the poll response message, said poll response message including a hash function identifier;
d) means for returning a response signal from the remote terminal to the control station on the digital messaging channel; and
e) means for decrypting the poll response message at the control station.
-
Specification