Multipath Alarm Transmission Overview

MultiPath is a generic description of duplicated or alternative technologies to transmit an alarm from a Client premises to a monitoring centre.

It is the new generation of a Dialler with a GSM backup across all Classes of alarm transmission products.

With alternative, duplication or backup becomes a different scenario where decisions can be made on alarms received without the knowledge of the path by which it was transmitted.

Products are now available which can report on the new digital IP services and switch to another completely independent technology should the primary path be unavailable. The number of paths is increasing and improving.

The task in general is to utilise the most easily available and cheapest solution as the primary option with other paths used as backup or to enhance the primary path. This could eventually fall back to the PSTN dialler path where available and reliable.

The aim is to achieve a Class of monitoring service which best suits the risk being protected, at the most cost effective price and conforming to Australian Standards AS/NZS2201:5 2008 for Transmission Systems. This Standard allows for future technologies and existing systems.

Currently what exist are Ethernet, Intranet or Internet services which may already be available at a Client’s Premises which allows access for transmission of alarm information at a low or no cost option. This is an immediate option for a low cost solution but may present some availability questions for a cheap ADSL service for example.

GPRS is the data network specifically designed for this purpose but comes at a cost to maintain continuous availability but reasonable data transfer cost. It is still reasonable to provide "polling" to ensure availability and can cover Class 2 and Class 3 services depending on network and coverage.

The choice is then what Class of service 1 to 5 is required to meet the risk assessment for the Alarm at the Premises, what the best primary path available is and what should be the redundant path. Not only is the choice of technology a question but the supplier of that service has to be evaluated. So if you chose a wireless solution then you are currently best suited to the GPRS product as provided by various Telecommunications Companies. The Telcos have different GPRS systems and different coverage around Australia.

Simply put, connect to the router Ethernet for the Primary path if you can and use a GPRS connection as a backup. This provides C2R2, C3R3, C4R3, C5R3 services.

Where Wireless only services (GPRS) are available this can provide C3R3,C3R2,C3,C2 services. This requires the best GPRS networks for reliable services and limits the Class of the service to Class 3 on most occasions. CMS supplies all of these services via the products offered to suit the monitoring risk and the best fit for the alarm installed.

(C3R3 is a Class 3 Primary Service with a Class 3 Redundant or backup service)

Where the GPRS service is used it is based on the service provider specifications, coverage and availability.

The ability of the service to maintain the advertised Class of service is to achieve that performance across the whole of the service. If the Primary service is poor or marginal then the Redundant service must be available to meet the Class specifications with no loss of availability or alarm transmission time. Security of the networks is taken as a mandatory requirement for tampering or substitution.

Where Video is used for verification, it is only for additional information for use by alarm response teams as it is difficult to transmit in accordance with AS/NZS2201.5:2008 at a reasonable cost.

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