Historical
BS EN 50136-2-3:1998
Alarm systems. Alarm transmission systems and equipment. Requirements for equipment used in systems with digital communicators using the public switched telephone network (British Standard)
This standard specifies in addition to the requirements specified in EN 50136-2-1, the requirements for equipment used in digital communicator systems utilising the Public Switched Telephone Network.
The remote centre will normally be an alarm deceiving centre but may be a satellite station with onward transceivers are connected for onward connection to an alarm receiving centre.
British Standards Institution [bsi]