参数资料
| 型号： | XRT75VL00DIV |
| 厂商： | Exar Corporation |
| 文件页数： | 61/92页 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 1CH 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 |
| 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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XRT75VL00D
59
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.4
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 5593 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 greater than 44.736Mbps. These "excursion"
of the de-mapped DS3 data-rate, from the nominal DS3 frequency can be viewed as occurrences of "mapping/
de-mapping" jitter. Since each of these "bit-stuffing" events involve the insertion of one DS3 data bit, we can
say that the amplitude of this "mapping/de-mapping" jitter is approximately 1UI-pp. From this point on, we will
be referring to this type of jitter (e.g., that which is induced by the mapping and de-mapping process) as "de-
mapping" jitter.
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.
9.2.2.3
The 44.736Mbps - 1ppm Case
In this case, let us assume that a DS3 signal, with a bit-rate of 44.736Mbps - 1ppm is being mapped into an
STS-1 signal with a bit-rate of 51.84Mbps + 0ppm. In this case, the following this will occur.
In general, most of the STS-1 SPEs will each transport 5592 DS3 data bits.
However, within a "one-second" period a DS3 signal that has a bit-rate of 44.736Mbps - 1ppm will deliver
approximately 45 too few bits below that of a DS3 signal with a bit-rate of 44.736Mbps + 0ppm. This means
that this particular signal will need to "positive-stuff" or exclude a DS3 data bit from mapping every (1/44.736)
= 22.35ms.
In other words, we will need to avoid mapping this DS3 data-bit about one in every
(22.35ms*8000) = 178.8 STS-1 SPEs.
What does this mean at the "Source" PTE?
All of this means that as the "Source" PTE maps this DS3 signal, with a data rate of 44.736Mbps - 1ppm into
an STS-1 signal, most of the resulting "outbound" STS-1 SPEs will transport 5592 DS3 data bits (e.g., 3 Stuff
Opportunity bits will be carrying DS3 data bits, the remaining 6 Stuff Opportunity bits are "stuff" bits). However,
in approximately one out of 178.8 "outbound" STS-1 SPEs, there will be a need for a "positive-stuffing" event.
Whenever these "positive-stuffing" events occur then (for these particular STS-1 SPEs) the SPE will carry only
5591 DS3 data bits (e.g., in this case, only 2 Stuff Opportunity bits will be carrying DS3 data-bits, and the
remaining 7 Stuff Opportunity bits are "stuff" bits).
Figure 40 presents an illustration of the STS-1 SPE traffic that will be generated by the "Source" PTE, during
this condition.
相关PDF资料 |
PDF描述 |
|---|---|
| XRT75VL00IV-F | IC LIU E3/DS3/STS-1 1CH 52TQFP |
| XRT79L71IB-F | IC LIU/FRAMER DS3/E3 1CH 208BGA |
| XRT81L27IV-F | IC LIU EI 7CH 3.3V 128TQFP |
| XRT82D20IW-F | IC LIU E1 SGL 28SOJ |
| XRT82L24AIV-F | IC LIU E1 QAUD 100TQFP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| XRT75VL00DIV-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 |
| XRT75VL00DIVTR | 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 |
| XRT75VL00DIVTR-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 |
| XRT75VL00ES | 功能描述:时钟合成器/抖动清除器 1CHT3/E3/STS1LIU+A 3.3V VOLTAGE DRIVE 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 |
| XRT75VL00IV | 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 |
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