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| 型号： | DS26334DK |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 43/121页 |
| 文件大小： | 0K |
| 描述： | KIT DESIGN FOR DS26334 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 设计资源： | DS26334DK Gerber Files |
| 标准包装： | 1 |
| 主要目的： | 电信，线路接口单元（LIU） |
| 已用 IC / 零件： | DS26334 |
| 已供物品： | 板，线缆，电源 |
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DS26334 3.3V, 16-Channel, E1/T1/J1 Short/Long-Haul Line Interface Unit
28 of 121
5.5.3
Peak Detector and Slicer
The slicer determines the polarity and presence of the received data. The output of the slicer is sent to the clock
and data recovery circuitry for extraction of data and clock. The slicer has a built-in peak detector for determination
of the slicing threshold.
5.5.4
Receive Level Indicator
The DS26334 will report the signal strength at RTIP and RRING in increments described in Table 6-17 via register
bits CnRL3–CnRL0 located in the RSL1–4
5.5.5
Clock and Data Recovery
registers.
The resultant E1 or T1 clock derived from the 2.048/1.544 PLL is internally multiplied by 16 via another internal PLL
and fed to the clock recovery system. The clock recovery system uses the clock from the PLL circuit to form a 16
times oversampler, which is used to recover the clock and data. This oversampling technique offers outstanding
performance to meet jitter tolerance specifications.
5.5.6
Loss of Signal
The DS26334 uses both the digital and analog loss-detection method in compliance with the latest ANSI T1.231 for
T1/J1 and ITU-T G.775 or ETS 300 233 for E1 mode of operation.
LOS is detected if the receiver level falls bellow a threshold analog voltage for certain duration. Alternatively, this
can be termed as having received “zeros” for certain duration. The signal level and timing duration are defined in
accordance with the ANSI T1.231, ITU-T G.775, or ETS 300 233 specifications.
For short-haul mode, the loss detection thresholds are based on cable loss of 18dB for both T1 and E1 modes. For
long-haul mode, the LOS detection threshold is based on cable loss of 38dB for T1 mode and 45dB for E1 mode.
RCLK is replaced by MCLK when the receiver detects a loss of signal. If the AISEL bit is set in the GC register or
the IAISEL bit is set, the RPOS/RNEG data is replaced by AIS. The loss state is exited when the receiver detects a
certain number of ones density at a higher signal level than the loss detection level. The loss detection signal level
and loss reset signal level are defined with a hysteresis to prevent the receiver from bouncing between “LOS” and
“no LOS” states.
Table 5-7 outlines the specifications governing the loss function.
Table 5-7. Loss Criteria ANSI T1.231, ITU-T G.775, and ETS 300 233 Specifications
CRITERIA
STANDARD
T1.231
ITU-T G.775
ETS 300 233
Loss
Detection
Criteria
No pulses are detected for 175
±75 bits.
No pulses are detected for
duration of 10 to 255 bit
periods.
No pulses are detected for a
duration of 2048 bit periods or
1ms.
Loss Reset
Criteria
Loss is terminated if a duration
of 12.5% ones are detected over
duration of 175 ±75 bits.
Loss is not terminated if 8
consecutive zeros are found if
B8ZS encoding is used. If B8ZS
is not used loss is not
terminated if 100 consecutive
pulses are zero.
The incoming signal has
transitions for duration of 10 to
255 bit periods.
Loss reset criteria is not
defined.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS26334G | 功能描述:电信集成电路 3.3V E1/T1/J1 16Ch Short/Long Haul LIU RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
| DS26334G+ | 功能描述:电信集成电路 3.3V E1/T1/J1 16Ch Short/Long Haul LIU RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
| DS26334GA2 | 功能描述:电信集成电路 RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
| DS26334GA2+ | 功能描述:电信集成电路 RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
| DS26334GA3 | 功能描述:电信集成电路 3.3V E1/T1/J1 16Ch Short/Long Haul LIU RoHS:否 制造商:STMicroelectronics 类型:Telecom IC - Various 工作电源电压:4.75 V to 5.25 V 电源电流: 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:PQFP-100 封装:Tray |
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