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| 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： | 31/115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
31 of 115
5.5.7 Bipolar Violation and Excessive Zero Detector
DS26334 detects code violations, BPV and excessive zero errors. The reporting of the errors is done through the
pin RNEGn/CVn.
Excessive zeros are detected if eight consecutive zeros are detected with B8ZS enabled and four consecutive
zeros are detected with HDB3 enabled. Excessive Zero detection is selectable when single-rail mode and
HDB3/B8ZS encoding/decoding is selected.
The bits in
EZDE
and
CVDEB
registers determine the combinations that are reported.
Table 5-11
outlines the
functionality:
Table 5-11. BPV, Code Violation, and Excessive Zero Error Reporting
CONDITIONS
CVn PIN REPORTS
EZDE is reset, CVDEB is reset
EZDE is set, CVDEB is reset
EZDE is reset, CVDEB is set
EZDE is set, CVDEB is set
BPV + Code violation
BPV + Code violation + Excessive zero
BPV
BPV + Excessive zero
5.6 Jitter Attenuator
The DS26334 contains an onboard jitter attenuator that can be set to a depth of either 32 or 128 bits via the JADS
bit in register
GC.
It can also be controlled on an individual LIU basis by settings in the
IJAFDS
register.
The 128-bit mode is used in applications where large excursions of wander are expected. The 32-bit mode is used
in delay sensitive applications. The characteristics of the attenuation are shown in
Figure 5-9
. The jitter attenuator
can be placed in either the receive path or the transmit path or none by appropriately setting the JAPS and the JAE
bits in register
GC
. These selections can be changed on an individual LIU basis by settings in the
IJAPS
and
IJAE
.
In order for the jitter attenuator to operate properly, a 2.048MHz or multiple thereof or 1.544MHz clock or multiple
thereof must be applied at MCLK. ITU specification G.703 requires an accuracy of ±50ppm for both T1 and E1
Applications. TR62411 and ANSI specs require an accuracy of ±32ppm for T1 interfaces. On-board circuitry
adjusts either the recovered clock from the clock/data recovery block or the clock applied at the TCLK pin to create
a smooth jitter-free clock, which is used to clock data out of the jitter attenuator FIFO. It is acceptable to provide a
jittery clock at the TCLK pin if the jitter attenuator is placed on the transmit side. If the incoming jitter exceeds either
120UI
P-P
(buffer depth is 128 bits) or 28 UI
P-P
(buffer depth is 32 bits), then the DS26334 will divide the internal
nominal 32.768MHz (E1) or 24.704MHz (T1) clock by either 15 or 17 instead of the normal 16 to keep the buffer
from overflowing. When the device divides by either 15 or 17, it also sets the Jitter Attenuator Limit Trip (JFLT) bits
in the
IJAFLT
register described.
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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