参数资料
| 型号： | DS21Q41BT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/61页 |
| 文件大小： | 0K |
| 描述： | IC FRAMER T1 QUAD 128-TQFP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 72 |
| 控制器类型： | T1 调帧器 |
| 接口： | 并行/串行 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 电流 - 电源： | 30mA |
| 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 |
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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 “loop up” or “loop 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.
相关PDF资料 |
PDF描述 |
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| DS21Q44T+ | IC FRAMER ENHANCED E1 4X 128TQFP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q41BT+T | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| DS21Q41BTN | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Quad T1 Framer |
| DS21Q41-BTN | 功能描述:网络控制器与处理器 IC RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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