DS2152 datasheet(35/94 Pages) DALLAS

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DS2152

35 of 93

ALARM CRITERIA Table 4-2

ALARM

SET CRITERIA

CLEAR CRITERIA

Blue Alarm (AIS)

(see note 1 below)

when over a 3ms window, five

or less 0s are received

when over a 3 ms window, six or

more 0s are received

Yellow Alarm (RAI)

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

2. D4 12

th 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 12

th 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 12

th 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)

(this alarm is also referred to as

Loss Of Signal)

when 192 consecutive 0s are

received

when 14 or more 1s out of 112

possible bit positions are received

starting with the first one received

NOTES:

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

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

falsely trigger on a framed all 1s signal. The blue alarm criteria in the DS2152 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 DS2152 does; the following terms are

equivalent:

RBL = AIS

LRCL = LOS

RLOS = LOF

RYEL = RAI

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