参数资料
型号: XRT75L06DIB-F
厂商: Exar Corporation
文件页数: 68/103页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 6CH 217BGA
标准包装: 60
类型: 线路接口装置(LIU)
驱动器/接收器数: 6/6
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: 217-BBGA
供应商设备封装: 217-BGA(23x23)
包装: 托盘
XRT75L06D
xr
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.4
63
In general, the role/purpose of the POH bytes is to fulfill the following functions.
To support error detection within the STS-1 SPE
To support the transmission of various alarm conditions such as RDI-P (Path - Remote Defect Indicator) and
REI-P (Path - Remote Error Indicator)
To support the transmission and reception of "Path Trace" Messages
The role of the POH bytes is beyond the scope of this data sheet and will not be discussed any further.
7.2.1.2
Mapping DS3 data into an STS-1 SPE
Now that we have defined the STS-1 SPE, we can now describe how a DS3 signal is mapped into an STS-1
SPE. As mentioned above, the STS-1 SPE is basically an 87 byte column x 9 row structure of data. The very
first byte column (e.g., in all 9 bytes) consists of the POH (Path Overhead) bytes. All of the remaining bytes
within the STS-1 SPE is simply referred to as "user" or "payload" data because this is the portion of the STS-1
signal that is used to transport "user data" from one end of the SONET network to the other. Telcordia GR-253-
CORE specifies the approach that one must use to asynchronously map DS3 data into an STS-1 SPE. In
short, this approach is presented below in Figure 44.
FIGURE 43. ILLUSTRATION OF THE BYTE STRUCTURE OF THE STS-1 SPE
Z5
Z4
Z3
H4
F2
G1
C2
B3
J1
Payload (or User) Data
86 Bytes
1 Byte
87 Bytes
9 Rows
相关PDF资料
PDF描述
XRT75L06IB-F IC LIU E3/DS3/STS-1 6CH 217BGA
XRT75R03DIV-F IC LIU E3/DS3/STS-1 3CH 128LQFP
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
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参数描述
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XRT75R03 制造商:EXAR 制造商全称:EXAR 功能描述:THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
XRT75R03D 制造商:EXAR 制造商全称:EXAR 功能描述:THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER