DS2196 datasheet(59/157 Pages) MAXIM

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DS2196

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Table 7-2: ALARM CRITERIA

ALARM

SET CRITERIA

CLEAR CRITERIA

Blue Alarm (AIS) (see note 1

below)

when over a 3 ms window,

5 or less zeros are received

when over a 3 ms window, 6

or more zeros are received

Yellow Alarm (RAI)

1. D4 bit 2 mode(RCR2.2=0)

2. D4 12th F–bit mode

(RCR2.2=1; this mode is also

referred to as the “Japanese

Yellow Alarm”)

3. ESF mode

when bit 2 of 256

consecutive channels is set

to 0 for at least 254

occurrences

when the 12th framing bit is

set to “1” for two

consecutive occurrences

when 16 consecutive

patterns of 00FF appear in

the FDL

when bit 2 of 256 consecutive

channels is set to 0 for less

than 254 occurrences

when the 12th framing bit is

set to 0 for two consecutive

occurrences

when 14 or less patterns of

00FF hex out of 16 possible

appear in the FDL

Red Alarm (LRCL or RCL)

(this alarm is also referred to

as Loss Of Signal)

when 192 consecutive 0’s

are received

when 14 or more 1’s out of

112 possible bit positions are

received starting with the first

1 received

NOTES:

1. The definition of Blue Alarm (or Alarm Indication Signal) is an unframed all 1’ss signal. Blue alarm

detectors should be able to operate properly in the presence of a 10E–3 error rate and they should not

falsely trigger on a framed all 1’ss signal. The blue alarm criteria in the DS2196 have been set to

achieve this performance. It is recommended that the RBL bit be qualified with the RLOS bit.

2. ANSI specifications use a different nomenclature than the DS2196 does; the following terms are

equivalent:

RBL = AIS

LRCL = LOS

RLOS = LOF

RYEL = RAI

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