参数资料
型号: XRT75L03DIV-F
厂商: Exar Corporation
文件页数: 18/134页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 3CH 128LQFP
标准包装: 72
类型: 线路接口装置(LIU)
驱动器/接收器数: 3/3
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: 128-LQFP 裸露焊盘
供应商设备封装: 128-LQFP(14x20)
包装: 托盘
XRT75L03D
á
REV. 1.0.0
THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
109
9.3.4
Why are we talking about Pointer Adjustments?
The overall SONET network consists of numerous "Synchronization Islands". As a consequence, whenever a
SONET signal is being transmitted from one "Synchronization Island" to another; that SONET signal will
undergo a "clock domain" change as it traverses the network. This clock domain change will result in periodic
pointer-adjustments occurring within this SONET signal. Depending upon the direction of this "clock-domain"
shift that the SONET signal experiences, there will either be periodic "incrementing" pointer-adjustment events
or periodic "decrementing" pointer-adjustment events within this SONET signal.
Regardless of whether a given SONET signal is experiencing incrementing or decrementing pointer
adjustment events, each pointer adjustment event will result in an abrupt 8-bit shift in the position of the SPE
within the STS-1 data-stream. If this STS-1 signal is transporting an "asynchronously-mapped" DS3 signal;
then this 8-bit shift in the location of the SPE (within the STS-1 signal) will result in approximately 8UIpp of jitter
within the asynchronously-mapped DS3 signal, as it is de-mapped from SONET. In “Section 9.5, A Review of
we will discuss the "Category I Intrinsic Jitter Requirements (for DS3 Applications) per Telcordia GR-253-
CORE. However, for now we will simply state that this 8UIpp of intrinsic jitter far exceeds these "intrinsic jitter"
requirements.
In summary, pointer-adjustments events are a "fact of life" within the SONET/SDH network. Further, pointer-
adjustment events, within a SONET signal that is transporting an asynchronously-mapped DS3 signal, will
impose a significant impact on the Intrinsic Jitter and Wander within that DS3 signal as it is de-mapped from
SONET.
9.4
Clock Gapping Jitter
In most applications (in which the XRT75L03D will be used in a SONET De-Sync Application) the user will
typically interface the XRT75L03D to a Mapper Device in the manner as presented below in Figure 47.
In this application, the Mapper IC will have the responsibility of receiving an STS-N signal (from the SONET
Network) and performing all of the following operations on this STS-N signal.
Byte-de-interleaving this incoming STS-N signal into N STS-1 signals
Terminating each of these STS-1 signals
Extracting (or de-mapping) the DS3 signal(s) from the SPEs within each of these terminated STS-1 signals.
FIGURE 47. ILLUSTRATION OF THE TYPICAL APPLICATIONS FOR THE XRT75L03D IN A SONET DE-SYNC APPLICA-
TION
DS3 to STS-N
Mapper/
Demapper
IC
DS3 to STS-N
Mapper/
Demapper
IC
XRT75L03D
STS-N Signal
TPDATA_n input pin
TCLK_n input
De-Mapped (Gapped)
DS3 Data and Clock
相关PDF资料
PDF描述
XRT75L03IV-F IC LIU E3/DS3/STS-1 3CH 128LQFP
XRT75L04DIV-F IC LIU E3/DS3/STS-1 4CH 176TQFP
XRT75L04IV-F IC LIU E3/DS3/STS-1 4CH 176LQFP
XRT75L06DIB-F IC LIU E3/DS3/STS-1 6CH 217BGA
XRT75L06IB-F IC LIU E3/DS3/STS-1 6CH 217BGA
相关代理商/技术参数
参数描述
XRT75L03DIVTR 功能描述:时钟合成器/抖动清除器 3CHNNEL E3/DS3/STS 1 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
XRT75L03DIVTR-F 功能描述:接口 - 专用 RoHS:否 制造商:Texas Instruments 产品类型:1080p60 Image Sensor Receiver 工作电源电压:1.8 V 电源电流:89 mA 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:BGA-59
XRT75L03ES 功能描述:时钟合成器/抖动清除器 3 CH 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
XRT75L03IV 功能描述:外围驱动器与原件 - PCI 3CH E3/DS3/STS1 JITTER ATTENUATOR 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
XRT75L03IV-F 功能描述:外围驱动器与原件 - PCI 3-Ch DS3, E3, STS-1 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