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参数资料
| 型号： | DS26334 |
| 英文描述： | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
| 中文描述： | 3.3V、16路、E1/T1/J1短/长程线路接口单元 |
| 文件页数： | 29/115页 |
| 文件大小： | 756K |
| 代理商： | DS26334 |
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DS26334 3.3V, 16-Channel, E1/T1/J1 Short/Long-Haul Line Interface Unit
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5.5.4 Clock and Data Recovery
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 over sampler, which is used to recover the clock and data. This over sampling technique offers outstanding
performance to meet jitter tolerance specifications.
5.5.5 Loss of Signal
The DS26334 uses both the Digital and Analog loss detection method in compliance with the latest T1.231 for
T1/J1 and ITU G.775 or ETSI 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 T1.231 or G.775 or ETSI 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.
The following table outlines the specifications governing the loss function:
Table 5-7. Loss Criteria T1.231, G.775, and ETSI 300 233 Specifications
STANDARD
ITU G.775
CRITERIA
T1.231
ETSI 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.
5.5.5.1
4.5.3.1 ANSI T1.231 for T1 and J1 Modes
For short-haul mode, loss is detected if the received signal level is less than 200mV for duration of 192 bit periods.
LOS is reset if the all of the following criteria are met:
24 or more ones are detected in 192-bit period with a detection threshold of 300mV measured
at RTIP and RRING.
During the 192 bits less than 100 consecutive zeros are detected.
8 consecutive zeros are not detected if B8ZS is set.
For long-haul mode, loss is detected if the received signal level is less than 30mV for duration of 192 bit periods.
LOS is reset if the all of the following criteria are met:
24 or more ones are detected in 192-bit period with a detection threshold of 40mV measured
at RTIP and RRING.
During the 192 bits less than 100 consecutive zeros are detected.
8 consecutive zeros are not detected if B8ZS is set.
相关PDF资料 |
PDF描述 |
|---|---|
| DS26334G | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
| DS26334GN | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
| DS26503 | T1/E1/J1 BITS Element |
| DS26503L | T1/E1/J1 BITS Element |
| DS26503LN | T1/E1/J1 BITS Element |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS26334_07 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3.3V, 16-Channel, E1/T1/J1 Shortand Long-Haul Line Interface Unit |
| DS26334DK | 功能描述:网络开发工具 DS26334 Dev Kit RoHS:否 制造商:Rabbit Semiconductor 产品:Development Kits 类型:Ethernet to Wi-Fi Bridges 工具用于评估:RCM6600W 数据速率:20 Mbps, 40 Mbps 接口类型:802.11 b/g, Ethernet 工作电源电压:3.3 V |
| 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 |
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