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| 型號： | XRT75R12DIB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 128/133頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LIU E3/DS3/STS-1 12CH 420TBGA |
| 標準包裝： | 40 |
| 類型： | 線路接口裝置（LIU） |
| 驅(qū)動器/接收器數(shù)： | 12/12 |
| 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： | 420-LBGA 裸露焊盤 |
| 供應商設(shè)備封裝： | 420-TBGA（35x35） |
| 包裝： | 托盤 |
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XRT75R12D
90
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.3
8.2.1.1
A Brief Description of an STS-1 Frame
In order to be able to describe how a DS3 signal is asynchronously mapped into an STS-1 SPE, it is important
to define and understand all of the following.
The STS-1 frame structure
The STS-1 SPE (Synchronous Payload Envelope)
Telcordia GR-253-CORE's recommendation on mapping DS3 data into an STS-1 SPE
An STS-1 frame is a data-structure that consists of 810 bytes (or 6480 bits). A given STS-1 frame can be
viewed as being a 9 row by 90 byte column array (making up the 810 bytes). The frame-repetition rate (for an
STS-1 frame) is 8000 frames/second. Therefore, the bit-rate for an STS-1 signal is (6480 bits/frame * 8000
frames/sec =) 51.84Mbps.
A simple illustration of this SONET STS-1 frame is presented below in Figure 38.
Figure 38 indicates that the very first byte of a given STS-1 frame (to be transmitted or received) is located in
the extreme upper left hand corner of the 90 column by 9 row array, and that the very last byte of a given STS-
1 frame is located in the extreme lower right-hand corner of the frame structure. Whenever a Network Element
transmits a SONET STS-1 frame, it starts by transmitting all of the data, residing within the top row of the STS-
1 frame structure (beginning with the left-most byte, and then transmitting the very next byte, to the right). After
the Network Equipment has completed its transmission of the top or first row, it will then proceed to transmit the
second row of data (again starting with the left-most byte, first). Once the Network Equipment has transmitted
the last byte of a given STS-1 frame, it will proceed to start transmitting the very next STS-1 frame.
The illustration of the STS-1 frame (in Figure 38) is very simplistic, for multiple reasons. One major reason is
that the STS-1 frame consists of numerous types of bytes. For the sake of discussion within this data sheet,
the STS-1 frame will be described as consisting of the following types (or groups) of bytes.
The Transport Overheads (or TOH) Bytes
The Envelope Capacity Bytes
8.2.1.1.1
The Transport Overhead (TOH) Bytes
The Transport Overhead or TOH bytes occupy the very first three (3) byte columns within each STS-1 frame.
Figure 39 presents another simple illustration of an STS-1 frame structure. However, in this case, both the
TOH and the Envelope Capacity bytes are designated in this Figure.
FIGURE 38. A SIMPLE ILLUSTRATION OF THE SONET STS-1 FRAME
STS-1 Frame (810 Bytes)
90 Bytes
9 Rows
First Byte of the STS-1 Frame
Last Byte of the STS-1 Frame
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