AT&T 76450 - Manual (Page 16)

Common Systems Connection Standards AT&T Services, Inc
Date: June 2013
ATT-TP-76450, Issue 15
Copyright © 2013, AT&T . All Rights Reserved.
Page 16
4.4.1 For those NEs requiring local alarms, a local control button shall be provided for local
office audible alarm cut-off (ACO) and shall be labeled “ACO”.
4.4.2 If provided the ACO function shall simultaneously silence all active office audible alarm
indications.
4.4.3 If provided the ACO function shall not inhibit office visual alarms, or subsequent audible
indications due to additional failures.
4.4.4 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.
4.4.5 An 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.
The color of the LED is most commonly amber but other colors are
acceptable.
4.4.6 As an optional feature, equipment may provide capabilities to remotely activate the ACO
function.
Telemetry Alarm Protocols:
4.5.1 Section 4.5 is included for reference only. Table 4.1 lists some of the possible protocols
and their preferences.
Table 4-1
TL1 and/or SNMP using TCP-IP,
X.25 or Async Transport Most Preferred
Serial – TBOS, TABS, BACnet,
Modbus, LonTalk, etc., Second Most Preferred: See 4.5.1 &
4.5.2 below
Discrete Least Preferred
4.5.2 BACNet, Modbus & Lon Talk protocols are only used in special applications where local
alarm collection products and element management systems are in place for their use.
Manufacturers should verify the applicability of using these protocols in advance.
Footnote: A discrete telemetry interface may be provided, on an optional basis, in addition to
higher level interfaces, to provide a summary of alarm and status information for remote
surveillance.
Alarm Interconnection:
4.6.1 Each NE in a bay shall produce its own unique set of alarm outputs. Pre-designed
“busing”, “multiples”, or “combining” of alarms or alarm leads within a bay is at the
discretion of AT&T and shall not be mandated by the equipment design.