参数资料
| 型号： | XRT75L00DIV-F |
| 厂商： | Exar Corporation |
| 文件页数： | 62/92页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 SGL 52TQFP |
| 标准包装： | 96 |
| 类型： | 线路接口装置（LIU） |
| 驱动器/接收器数： | 1/1 |
| 规程： | DS3，E3，STS-1，SONET |
| 电源电压： | 3.135 V ~ 3.465 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 52-LQFP |
| 供应商设备封装： | 52-TQFP（10x10） |
| 包装： | 托盘 |
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XRT75L00D
REV. 1.0.2
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
60
What does this mean at the Destination PTE?
In this case, this DS3 signal (which has now been mapped into an STS-1 data-stream) will be transported
across the SONET network. As this STS-1 signal arrives at the "Destination" PTE, this PTE will extract (or de-
map) this DS3 data from each incoming STS-1 SPE. Now, in this case, most (e.g., 177/178.8) of the incoming
STS-1 SPEs will contain 5592 DS3 data-bits. Therefore, the nominal data rate of the DS3 signal being de-
mapped from SONET will be 44.736Mbps. However, in approximately 1 out of every 178 incoming STS-1
SPEs, the SPE will carry only 5591 DS3 data bits. This means that (during these times) the data rate of the de-
mapped DS3 signal will have an instantaneous frequency that is less than 44.736Mbps. These "excursions" of
the de-mapped DS3 data-rate, from the nominal DS3 frequency can be viewed as occurrences of mapping/de-
mapping jitter with an amplitude of approximately 1UI-pp.
Since this occurrence of "de-mapping" jitter is periodic and occurs once every 22.35ms, we can state that this
jitter has a frequency of 44.7Hz.
We talked about De-Mapping Jitter, What about De-Mapping Wander?
The Telcordia and Bellcore specifications define "Wander" as "Jitter with a frequency of less than 10Hz".
Based upon this definition, the DS3 signal (that is being transported by SONET) will cease to contain jitter and
will now contain "Wander", whenever the frequency offset of the DS3 signal being mapped into SONET is less
than 0.2ppm.
9.3
Jitter/Wander due to Pointer Adjustments
In the previous section, we described how a DS3 signal is asynchronously-mapped into SONET, and we also
defined "Mapping/De-mapping" jitter. In this section, we will describe how occurrences within the SONET
network will induce jitter/wander within the DS3 signal that is being transported across the SONET network.
In order to accomplish this, we will discuss the following topics in detail.
The concept of an STS-1 SPE pointer
The concept of Pointer Adjustments
The causes of Pointer Adjustments
How Pointer Adjustments induce jitter/wander within a DS3 signal being transported by that SONET network.
9.3.1
The Concept of an STS-1 SPE Pointer
As mentioned earlier, the STS-1 SPE is not aligned to the STS-1 frame boundaries and is permitted to "float"
within the Envelope Capacity.
As a consequence, the STS-1 SPE will often times "straddle" across two
FIGURE 40. AN ILLUSTRATION OF THE STS-1 SPE TRAFFIC THAT WILL BE GENERATED BY THE SOURCE PTE, WHEN
MAPPING A
DS3 SIGNAL THAT HAS A BIT RATE OF 44.736MBPS - 1PPM, INTO AN STS-1 SIGNAL
Source
PTE
Source
PTE
44.736Mbps - 1ppm
5592
DS3 Data
Bits
5592
DS3 Data
Bits
5592
DS3 Data
Bits
5592
DS3 Data
Bits
SPE # N
SPE # N+1
5592
DS3 Data
Bits
5592
DS3 Data
Bits
SPE # N+177
5591
DS3 Data
Bits
5591
DS3 Data
Bits
5592
DS3 Data
Bits
5592
DS3 Data
Bits
SPE # N+178
SPE # N+179
DS3 Data
Bit Excluded Here
STS-1 SPE Data Stream
相关PDF资料 |
PDF描述 |
|---|---|
| XRT75L00IV-F | IC LIU E3/DS3/STS-1 SGL 52TQFP |
| XRT75L02DIV-F | IC LIU E3/DS3/STS-1 2CH 100TQFP |
| XRT75L03DIV-F | IC LIU E3/DS3/STS-1 3CH 128LQFP |
| XRT75L03IV-F | IC LIU E3/DS3/STS-1 3CH 128LQFP |
| XRT75L04DIV-F | IC LIU E3/DS3/STS-1 4CH 176TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT75L00DIVTR | 功能描述:时钟合成器/抖动清除器 3.3V 1 CH E3/DS3/STS W/SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| XRT75L00DIVTR-F | 功能描述:时钟合成器/抖动清除器 3.3V 1 CH E3/DS3/STS W/SONET DE-SYNCH RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| XRT75L00ES | 功能描述:时钟合成器/抖动清除器 1CH T3/E3/STS1 LIU+JA 3.3V RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
| XRT75L00IV | 功能描述:外围驱动器与原件 - PCI 3.3V 1 CH E3/DS3/STS W/JITTER ATTEN RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| XRT75L00IV-F | 功能描述:外围驱动器与原件 - PCI Sngl Chip LIU DS3/E3 RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
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