參數(shù)資料
型號: XRT75L04DIVTR
廠商: Exar Corporation
文件頁數(shù): 60/98頁
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 4CH 176TQFP
標準包裝: 1,000
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 4/4
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: 176-LQFP
供應(yīng)商設(shè)備封裝: 176-TQFP(24x24)
包裝: 帶卷 (TR)
á
XRT75L04D
REV. 1.0.1
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
59
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.
9.2.1.2
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 36.
FIGURE 35. 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
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