Keywords: blue alarm, AIS, yellow alarm, red alarm, RCL, alarm indication signal, ds2141a, ds2151, alarm set, clear alarms
|Alarm||Set Criteria||Clear Criteria|
|Blue Alarm (AIS)
(see note 1 below)
|when over a 3ms window, 5 or less zeros are received||when over a 3ms window, 6 or more zeros are received|
|1. D4 bit 2 mode (RCR2.2 = 0)||when bit 2 of 256 consecutive channels is set to zero for at least 254 occurrences||when bit 2 of 256 consecutive channels is set to zero for less than 254 occurrences|
|2. D4 12th Fbit mode (RCR2.2 = 1; this mode is also referred to as the "Japanese Yellow Alarm")||when the 12th framing bit is set to one for two consecutive occurrences||when the 12th framing bit is set to zero for two consecutive occurrences|
|3. ESF mode||when 16 consecutive patterns of 00FF hex appear in the FDL||when 14 or less patterns of 00FF hex out of 16 possible appear in the FDL|
|Red Alarm (RCL) (this alarm is also referred to as Loss Of Signal)||when 192 consecutive zeros are received||when at least 12.5% one's density is received|
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APPLICATION NOTE 338,AN338, AN 338, APP338, Appnote338, Appnote 338
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