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| 型號(hào)： | XRT75R06DIB-F |
| 廠商： | Exar Corporation |
| 文件頁(yè)數(shù)： | 79/105頁(yè) |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 6CH 217BGA |
| 標(biāo)準(zhǔn)包裝： | 126 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動(dòng)器/接收器數(shù)： | 6/6 |
| 規(guī)程： | DS3，E3，STS-1 |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 217-BBGA |
| 供應(yīng)商設(shè)備封裝： | 217-BGA（23x23） |
| 包裝： | 托盤(pán) |
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XRT75R06D
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.0
70
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.
8.3
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.
8.3.1
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 49. 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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XRT75R06IB-F | IC LIU E3/DS3/STS-1 6CH 217BGA |
| XRT75R12DIB-L | IC LIU E3/DS3/STS-1 12CH 420TBGA |
| XRT75R12IB-L | IC LIU E3/DS3/STS-1 12CH 420TBGA |
| XRT75VL00DIV | IC LIU E3/DS3/STS-1 1CH 52TQFP |
| XRT75VL00IV-F | IC LIU E3/DS3/STS-1 1CH 52TQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75R06ES | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 6CH T3/E3/STS1LIU+JA 3.3V W/REDUNDANCY RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| XRT75R06IB | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 6CH E3/DS3/STS1 LIU+Jitter Attenuato RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT75R06IB208 | 制造商:Exar Corporation 功能描述:Line Interface Unit 51.84Mbps DS3/E3/STS-1 Parallel 217-Pin BGA |
| XRT75R06IB-F | 功能描述:外圍驅(qū)動(dòng)器與原件 - PCI 6 Channel 3.3V-5V temp -45 to 85C RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT75R12 | 制造商:EXAR 制造商全稱:EXAR 功能描述:TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER |
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