参数资料
型号: XRT75L04DIV-F
厂商: Exar Corporation
文件页数: 59/98页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 4CH 176TQFP
标准包装: 72
类型: 线路接口装置(LIU)
驱动器/接收器数: 4/4
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: 176-LQFP
供应商设备封装: 176-TQFP(24x24)
包装: 托盘
XRT75L04D
á
FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. 1.0.1
58
Although the role of the H1, H2 and H3 bytes will be discussed in much greater detail in “Section 9.3, Jitter/
Wander due to Pointer Adjustments” on page 65. For now, we will simply state that the role of these bytes is
two-fold.
To permit a given PTE (Path Terminating Equipment) that is receiving an STS-1 data to be able to locate the
STS-1 SPE (Synchronous Payload Envelope) within the Envelope Capacity of this incoming STS-1 data
stream and,
To inform a given PTE whenever Pointer Adjustment and NDF (New Data Flag) events occur within the
incoming STS-1 data-stream.
9.2.1.1.2
The Envelope Capacity Bytes within an STS-1 Frame
In general, the Envelope Capacity Bytes are any bytes (within an STS-1 frame) that exist outside of the TOH
bytes. In short, the Envelope Capacity contains the STS-1 SPE (Synchronous Payload Envelope). In fact,
every single byte that exists within the Envelope Capacity also exists within the STS-1 SPE.
The only
difference that exists between the "Envelope Capacity" as defined in Figure 33 and Figure 34 above and the
STS-1 SPE is that the Envelope Capacity is aligned with the STS-1 framing boundaries and the TOH bytes;
whereas the STS-1 SPE is NOT aligned with the STS-1 framing boundaries, nor the TOH bytes.
The STS-1 SPE is an "87 byte column x 9 row" data-structure (which is the exact same size as is the Envelope
Capacity) that is permitted to "float" within the "Envelope Capacity". As a consequence, the STS-1 SPE (within
an STS-1 data-stream) will typically straddle across an STS-1 frame boundary.
9.2.1.1.3
The Byte Structure of the STS-1 SPE
As mentioned above, the STS-1 SPE is an 87 byte column x 9 row structure. The very first column within the
STS-1 SPE consists of some overhead bytes which are known as the "Path Overhead" (or POH) bytes. The
remaining portions of the STS-1 SPE is available for "user" data. The Byte Structure of the STS-1 SPE is
presented below in Figure 35.
FIGURE 34. THE BYTE-FORMAT OF THE TOH WITHIN AN STS-1 FRAME
A1
B1
D1
H1
B2
D4
S1
D10
D7
C1
F1
D3
H3
K2
D6
E2
D12
D9
A2
E1
D2
H2
K1
D5
M0
D11
D8
Envelope Capacity
Bytes
Envelope Capacity
Bytes
3 Byte Columns
87 Byte Columns
9 Rows
The TOH Bytes
相关PDF资料
PDF描述
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
XRT75R03DIV-F IC LIU E3/DS3/STS-1 3CH 128LQFP
XRT75R03IV-F IC LIU E3/DS3/STS-1 3CH 128LQFP
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