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| 型號： | XRT75R03DIV-F |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 9/135頁 |
| 文件大小： | 0K |
| 描述： | IC LIU E3/DS3/STS-1 3CH 128LQFP |
| 標準包裝： | 72 |
| 類型： | 線路接口裝置（LIU） |
| 驅動器/接收器數(shù)： | 3/3 |
| 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： | 128-LQFP |
| 供應商設備封裝： | 128-LQFP（14x20） |
| 包裝： | 托盤 |
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XRT75R03D
102
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER
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.
10.2.2.3
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.
FIGURE 40. AN ILLUSTRATION OF THE STS-1 SPE TRAFFIC THAT WILL BE GENERATED BY THE "SOURCE" PTE,
WHEN MAPPING IN 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
5593
DS3 Data
Bits
5593
DS3 Data
Bits
5592
DS3 Data
Bits
5592
DS3 Data
Bits
SPE # N+178
SPE # N+179
Extra DS3 Data
Bit Stuffed Here
STS-1 SPE Data Stream
相關PDF資料 |
PDF描述 |
|---|---|
| XRT75R03IV-F | IC LIU E3/DS3/STS-1 3CH 128LQFP |
| XRT75R06DIB-F | IC LIU E3/DS3/STS-1 6CH 217BGA |
| 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 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75R03DIVTR | 功能描述:時鐘合成器/抖動清除器 3CHNNEL E3/DS3/STS 1 JITTER ATTENUATOR 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 |
| XRT75R03DIVTR-F | 功能描述:接口 - 專用 RoHS:否 制造商:Texas Instruments 產(chǎn)品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| XRT75R03ES | 功能描述:時鐘合成器/抖動清除器 3CH 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 |
| XRT75R03IV | 功能描述:外圍驅動器與原件 - PCI 3CHNNEL E3/DS3/STS 1 JITTER ATTENUATOR RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| XRT75R03IV-F | 功能描述:外圍驅動器與原件 - PCI 3-Ch E3/DS3/STS-1 RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
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