參數(shù)資料
型號(hào)： DS21Q41BT
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)： 19/61頁
文件大小： 714K
代理商： DS21Q41BT
DS21Q41B
26 of 61
DS21Q41B ALARM SET & CLEAR CRITERIA Table 4-2
ALARM
SET CRITERIA
CLEAR CRITERIA
Blue Alarm (AIS)
(see note 1 below)
when over a 3 ms 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)
when bit 2 of 256 consecutive
channels is set to 0 for at least
254 occurrences
when bit 2 of 256 consecutive
channels is set to 0 for less than
254 occurrences
2. D4 12
th F-bit mode
(RCR2.2=1; this mode is also
referred to as the "Japanese
Yellow Alarm")
when the 12
th framing bit is set
to one for two consecutive
occurrences
when the 12
th framing bit is set to
0 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 0s 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 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 DS21Q41B 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 DS21Q41B does; the following terms are
equivalent:
RBL=AIS
RCL=LOS
RLOS=LOF
RYEL=RAI
LOOP UP/DOWN CODE DETECTION
Bits SR1.7 and SR1.6 will indicate when either the standard “l(fā)oop up” or “l(fā)oop down” codes are being
received by the DS21Q41B. When a loop up code has been received for 5 seconds, the CPE is expected
to loop the recovered data (without correcting BPVs) back to the source. The loop down code indicates
that the loopback should be discontinued. See the AT&T publication TR 62411 for more details. The
DS21Q41B will detect the loop up/down codes in both framed and unframed circumstances with bit error
rates as high as 10**-2. The loop code detector has a nominal integration period of 48 ms. Hence, after
about 48 ms of receiving either code, the proper status bit will be set to a 1. After this initial indication, it
is recommend that the software poll the DS21Q41B every 100 ms to 500 ms until 5 seconds has elapsed
to insure that the code is continuously present.
相關(guān)PDF資料
PDF描述
DS21Q42TN DATACOM, FRAMER, PQFP128
DS21Q42T DATACOM, FRAMER, PQFP128
DS21Q43AT DATACOM, FRAMER, PQFP128
DS21Q44T DATACOM, FRAMER, PQFP128
DS21Q44TN DATACOM, FRAMER, PQFP128
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21Q41-BT 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS21Q41BT+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 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(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q41BT+T 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 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(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21Q41BTN 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Quad T1 Framer
DS21Q41-BTN 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 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(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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