DS21FF42 Maxim Integrated Products, DS21FF42 Datasheet - Page 46

• Manufacturer Part Number: DS21FF42
• Description: IC FRAMER T1 4X4 16CH 300-BGA
• Manufacturer: Maxim Integrated Products

Specifications of DS21FF42

• Controller Type: T1 Framer
• Interface: Parallel/Serial
• Voltage - Supply: 2.97 V ~ 3.63 V
• Current - Supply: 300mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 300-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

ALARM CRITERIA Table 10-1
NOTES:
1. The definition of Blue Alarm (or Alarm Indication Signal) is an unframed all ones signal. Blue alarm
2. ANSI specifications use a different nomenclature than the DS21Q42 does; the following terms are
Blue Alarm (AIS) (see note 1
below)
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
Red Alarm (RCL) (this alarm is
also referred to as Loss Of
Signal)
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 ones signal. The blue alarm criteria in the DS21Q42 has been set to
achieve this performance. It is recommended that the RBL bit be qualified with the RLOS bit.
equivalent:
RBL = AIS
RCL = LOS
RLOS = LOF
RYEL = RAI
ALARM
when over a 3 ms window, 5 or
less zeros are received
when Bit 2 of 256 consecutive
channels is set to zero for at least
254 occurrences
when the 12th framing bit is set
to one for two consecutive
occurrences
when 16 consecutive patterns of
00FF appear in the FDL
when 192 consecutive zeros are
received
SET CRITERIA
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when over a 3 ms window, 6
or more zeros are received
when Bit 2 of 256 consecutive
channels is set to zero for less
than 254 occurrences
when the 12th framing bit is
set to zero for two consecutive
occurrences
when 14 or less patterns of
00FF hex out of 16 possible
appear in the FDL
when 14 or more ones out of
112 possible bit positions are
received starting with the first
one received
CLEAR CRITERIA