AT&T 76450 manual TL1 / TCP-IP

Common Systems Connection Standards	AT&T Services, Inc
Date: August 31, 2007	ATT-TP-76450, Issue 9

Footnote: The term "Network Element" is used within this document to refer to any and all equipment other than switching equipment deployed in a CO or remote location. This would include, but is not limited to transport, conditioning, power and testing equipment as well as environmental and building operations sensors.

4.3Separation of Local Alarms

•Local alarms must be separate alarm outputs from the telemetry alarms. At a minimum this would be a Major (MJ) and Minor (MN), both audible and visual. The visual alarm output must be designed so it cannot be disabled with an alarm cut-off (ACO).

4.4Audible Alarm Cut-off (ACO)

A local control button shall be provided for local office audible alarm cut-off (ACO).

•A local control button shall be provided for local office audible alarm cut-off (ACO).

•The ACO function shall simultaneously silence all active office audible alarm indications.

•The ACO function shall not inhibit office visual alarms, or subsequent audible indications due to additional failures.

•If all previous alarms have been ACO’ed, and a new alarm becomes active, then the ACO condition shall be cleared and the highest severity audible alarm contact shall be activated.

•An amber LED shall be associated with the ACO button to indicate the current status of the ACO. If active office audible alarm indications are cut-off due to execution of the ACO, the ACO LED shall be lit indicating that the alarm condition exists and that all active alarms of the system have been ACO’ed. The ACO LED stays extinguished if there are no active alarms when the ACO is executed. The ACO LED is extinguished when all active alarms clear, or when a new alarm is activated in the system, thus clearing the ACO condition.

•As an optional feature, equipment may provide capabilities to remotely activate the ACO function.

4.5Telemetry Alarm Protocols:

Table 4-1 is included for reference only.

Table 4-1

TL1 / TCP-IP	Most Preferred
TL1 (sync) X.25	Second Most
	Preferred
TL1 (async)	Third Most Preferred
BACnet/Modbus/LonT	Fourth Most
alk	Preferred
E2A Serial	Fifth Most Preferred

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