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| 型號： | XRT75R03DIV |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 33/135頁 |
| 文件大?。?/td> | 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(qū)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(shè)備封裝： | 128-LQFP（14x20） |
| 包裝： | 托盤 |
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XRT75R03D
124
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER
REV. 1.0.4
Our simulation results indicate that Jitter Attenuator PLL (within the XRT75R03D LIU IC) will have no problem
handling and processing the "Data-Signal" and "Clock-Signal" from a Mapper IC/ASIC if no pre-processing has
been performed on these signals. In order words, our simulation results indicate that the Jitter Attenuator PLL
(within the LIU IC) will have no problem handling the "worst-case" of 59 consecutive bits of no clock pulses in
the "Clock-Signal (due to the Mapper IC processing the TOH bytes, an Incrementing Pointer-Adjustment-
induced "stuffed-byte", the POH byte, and the two fixed-stuff bytes within the STS-1 SPE, etc), immediately
followed be processing clusters of DS3 data-bits (as shown in Figure 38) and still comply with the "Category I
Intrinsic Jitter Requirements per Telcordia GR-253-CORE for DS3 applications.
NOTE: If this sort of "pre-processing" is already supported by the Mapper device that you are using, then no further action
is required by the user.
10.8.2.2
OUR PRE-PROCESSING RECOMMENDATIONS
For the time-being, we recommend that the customer implement the "pre-processing" of the DS3 "Data-Signal"
and "Clock-Signal" as described below. Currently we are aware that some of the Mapper products on the
Market do implement this exact "pre-processing" algorithm. However, if the customer is implementing their
Mapper Design in an ASIC or FPGA solution, then we strongly recommend that the user implement the
necessary logic design to realize the following recommendations.
Some time ago, we spent some time, studying (and then later testing our solution with) the PM5342 OC-3 to
DS3 Mapper IC from PMC-Sierra. In particular, we wanted to understand the type of "DS3 Clock" and "Data"
signal that this DS3 to OC-3 Mapper IC outputs.
During this effort, we learned the following.
1.
This "DS3 Clock" and "Data" signal, which is output from the Mapper IC consists of two major "repeating"
patterns (which we will refer to as "MAJOR PATTERN A" and "MAJOR PATTERN B". The behavior of
each of these patterns is presented below.
MAJOR PATTERN A
MAJOR PATTERN A consists of two "sub" or minor-patterns, (which we will refer to as "MINOR PATTERN P1
and P2).
MINOR PATTERN P1 consists of a string of seven (7) clock pulses, followed by a single gap (no clock pulse).
An illustration of MINOR PATTERN P1 is presented below in Figure 59.
It should be noted that each of these clock pulses has a period of approximately 19.3ns (or has an
"instantaneously frequency of 51.84MHz).
MINOR Pattern P2 consists of string of five (5) clock pulses, which is also followed by a single gap (no clock
pulse). An illustration of Pattern P2 is presented below in Figure 60.
FIGURE 59. ILLUSTRATION OF MINOR PATTERN P1
1
2
3
4
5
6
7
Missing Clock Pulse
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT75R03DIV-F | 功能描述:網(wǎng)絡控制器與處理器 IC 3-Ch E3/DS3/STS-1 RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| 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(qū)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 |
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