While the standards for transmission of security signals to off-site locations are primarily specified by industry groups, the standards for the transmission of fire alarms and their supervisory signals are subject to legal enforcement. NFPA 72, The National Fire Alarm Code, does not prohibit transmission means other than POTS (220.127.116.11), but whatever method is chosen must have compliant operation.
A quick and dirty review of the requirements in the 2002 edition of NFPA 72 further emphasizes the criticality of alarm transmission reliability. Beginning with section 6.12, the code requires that any system transmitting signals to “continuously attended locations” provide not only alarm signals but trouble conditions to include fail-safe operation. This requires receipt of a signal when the power is lost or the phone carrier is inoperative.
If the alarm monitoring company has a DACT connected to the VoIP line, the requirements of Chapter 8 will still require compliance including, but not limited to, the following:
• Ability to seize and disconnect the line from incoming and outgoing calls.
• A second transmission medium that is automatically connected upon failure of the primary line. A list of seven methods is found in 18.104.22.168.1.4 (A).
• Means to reset and retry the transmission attempts.
• Digital code or other means of verifying successful transmission.
• 24-hour (max.) interval testing.
VoIP equipment has not been universally tested or listed to verify that it complies with these requirements. NFPA 72 22.214.171.124.3 requires that “computer-aided alarm and supervisory signal-processing hardware be listed for the specific application.” In many local jurisdictions, this will require a fire alarm listing for the equipment.
Note that the requirements of NFPA 72 are only applicable when fire alarm systems are transmitted off-site.
Precautions to Take
The first step for those considering VoIP is to obtain the necessary information by simply asking hard questions. VoIP service providers and alarm central station monitoring services must be asked to demonstrate transmission of alarm conditions not only under normal circumstances, but also when
• there is a failure of the primary electrical power source; or
• the subscriber's VoIP line is in use.
Additionally, supervisory or trouble conditions must be demonstrated and documented upon loss of VoIP service or failure of VoIP conversion equipment, computers, cable service or other essential emergency communications transmitting components.
Potential subscribers should insist upon receiving direct affirmative responses to these concerns; observing the transmission of these conditions, and obtaining references of other users of the service who have alarm systems.
The cable and phone service industry does not have the same level of strict standards enforcement that is present in the life safety industry. But some industry and non-governmental agencies are initiating activities that are intended to find solutions to these VoIP emergency communications concerns. Among these are the National Fire Protection Association and the Alarm Industry Communications Committee. The latter is a joint effort of the Security Industry Association, National Burglar and Fire Alarm Association and the Central Station Alarm Association.
These groups, and others, are beginning to work with the cable industry and VoIP provider representatives to propose solutions. The solutions will be multi-faceted to include activities that inform the public of VoIP operational issues; document industry steps to address these issues; provide direction and qualification standards for installers; and develop standards that can affect the engineered operation of VoIP infrastructure equipment. Among the first steps that must be taken: All the interested parties and groups must develop a framework to coordinate their efforts. Recently their cooperative efforts in establishing this framework have begun.
Progress in voice and Internet communication cannot and should not be restrained. New offerings in technology will bring new capabilities and, hopefully, reduced costs to users. But when new systems alter the infrastructure affecting our vital services, we must ensure that those essential services remain operational. Alarm systems protect the lives and property of millions of our family members, associates, employees and friends. VoIP service must be engineered so as not to jeopardize the essential emergency communications upon which public safety depends.