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PM4328-PI 参数 Datasheet PDF下载

PM4328-PI图片预览
型号: PM4328-PI
PDF下载: 下载PDF文件 查看货源
内容描述: 高密度T1 / E1成帧器,集成M13多路复用器 [HIGH DENSITY T1/E1 FRAMER WITH INTEGRATED M13 MULTIPLEXER]
分类和应用: 复用器数字传输控制器电信集成电路电信电路异步传输模式ATM
文件页数/大小: 250 页 / 1399 K
品牌: PMC [ PMC-SIERRA, INC ]
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STANDARD PRODUCT  
PM4328 TECT3  
DATASHEET  
PMC-2011596  
ISSUE 1  
HIGH DENSITY T1/E1 FRAMER  
AND M13 MULTIPLEXER  
Figure 29: CRCE Count vs. BER (E1 mode)  
1.00E-02  
1.00E-03  
1.00E-04  
1.00E-05  
1.00E-06  
1.00E-07  
0
200  
400  
600  
800  
1000  
1200  
CRCE  
Figure 30 illustrates the expected count values for a range of Bit Error Ratios in  
T1 mode.  
Figure 30: FER Count vs. BER (T1 ESF mode)  
9
Average Count Over  
)
8
7
6
5
4
3
2
1
0
Many 1 Second Intervals  
2
-
0
1
x
(
e
t
a
R
r
o
r
r
E
t
i
B
0
50  
100  
150  
200  
250  
Framing Bit Error Count Per Second  
Since the maximum number of ESF superframes that can occur in one second is  
333, the 9-bit BEE counter cannot saturate in one second in ESF framing format.  
Despite this, there is not a linear relationship between BER and BEE count, due  
-4  
to the nature of the CRC-6 calculation. At BERs below 10 , there tends to be no  
more than one bit error per superframe, so the number of CRC-6 errors is  
generally equal to the number of bit errors, which is directly related to the BER.  
-4  
However, at BERs above 10 , each CRC-6 error is often due to more than one  
bit error. Thus, the relationship between BER and BEE count becomes non-  
-4  
linear above a 10 BER. This must be taken into account when using ESF  
CRC-6 counts to determine the BER.  
PROPRIETARY AND CONFIDENTIAL  
139  
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