Huawei OptiX OSN 3500 - Page 30

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 There are two ways to mute alarm:
Alarm Muting
 1 the ALC switch on SCC/CXL1/4/16 board
 Short
 Long
 Attention: better leave ALC upward
 2 the Alarm Mute switch (MUTE):
OFF---the audio alarm will be closed thoroughly;
ON---the audio alarm will be reported.