參數(shù)資料
型號： DS21Q42T
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Controller
英文描述： DATACOM, FRAMER, PQFP128
封裝： TQFP-128
文件頁數(shù)： 57/119頁
文件大?。?/td> 1309K
代理商： DS21Q42T
DS21Q42
42 of 119
ALARM CRITERIA Table 7-1
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)
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 F–bit 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 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 14 or more ones 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 ones 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 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.
2. ANSI specifications use a different nomenclature than the DS21Q42 does; the following terms are
equivalent:
RBL = AIS
RCL = LOS
RLOS = LOF
RYEL = RAI
相關(guān)PDF資料
PDF描述
DS21Q43AT DATACOM, FRAMER, PQFP128
DS21Q44T DATACOM, FRAMER, PQFP128
DS21Q44TN DATACOM, FRAMER, PQFP128
DS21Q48N DATACOM, PCM TRANSCEIVER, PBGA144
DS21Q48 DATACOM, PCM TRANSCEIVER, PBGA144
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21Q42T+ 功能描述:網(wǎng)絡控制器與處理器 IC Enhanced Quad T1 Framer RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q42TN 功能描述:網(wǎng)絡控制器與處理器 IC Enhanced Quad T1 Framer RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q43A 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad E1 Framer
DS21Q43AT 功能描述:網(wǎng)絡控制器與處理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q43AT+ 功能描述:網(wǎng)絡控制器與處理器 IC Quad E1 Framer RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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