参数资料
型号: DS21Q42T+
厂商: Maxim Integrated Products
文件页数: 54/116页
文件大小: 0K
描述: IC FRAMER ENHANCED T1 4X 128TQFP
标准包装: 72
控制器类型: T1 调帧器
接口: 并行/串行
电源电压: 2.97 V ~ 3.63 V
电流 - 电源: 75mA
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 128-LQFP
供应商设备封装: 128-LQFP(14x20)
包装: 管件
DS21Q42
42 of 116
Table 7-1. 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)
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
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