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CX28333-1X 参数 Datasheet PDF下载

CX28333-1X图片预览
型号: CX28333-1X
PDF下载: 下载PDF文件 查看货源
内容描述: 单/双/三E3 / DS3 / STS - 1线路接口单元 [Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit]
分类和应用: 电信集成电路PC
文件页数/大小: 68 页 / 549 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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2.0 Functional Description  
CX28331/CX28332/CX28333  
2.3 Receiver  
Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit  
2.3 Receiver  
This section describes the detailed operation of the various blocks in the CX2833i  
receiver.  
2.3.1 Receive Sensitivity  
The receiver recovers data from the coaxial cable that is attenuated due to the  
frequency-dependent characteristics of the cable. In addition, the receiver  
compensates for the flat loss (across all frequencies) in the various electrical  
components and the variation in transmitted signal power.  
The CX2833i device is able to recover data that has been attenuated by a  
maximum of 900 feet of coax having characteristics and attenuation consistent  
with ANSI T1.102-1993, Annex C, Figure C.2. This approximates the  
characteristics of AT&T type 734/728 cable; almost the same attenuation  
characteristic is achieved by one-half the length of AT&T type 735 cable.  
2.3.2 AGC/VGA Block  
The Variable Gain Amplifier (VGA) receives the AMI input signal from the  
coaxial cable. The VGA supplies flat gain (independent of frequency) to make up  
for various flat losses in the transmission channel and for loss at one-half the  
symbol rate that cannot be made up by the equalizer. The VGA gain is controlled  
by a feedback loop which senses the amplitude of the equalizer output, acting to  
servo this amplitude for optimal slicing.  
2.3.3 Receive Equalizer  
The receive equalizer receives the differential signal from a VGA and acts to  
boost the high frequency content of the signal to reduce inter-symbol interference  
(ISI) to the point that correct decisions can be made by the slicer with a minimum  
of jitter in the recovered data.  
The REQH pin is provided to allow lower amounts of equalization (shorter  
equivalent cable lengths) for cases where a square-shaped pulse (that does not  
meet the DS3/STS-1 standards) is transmitted to the receiver. A square-shaped  
input has a much larger high-frequency content and could have overshoots at the  
EQ output high enough to cause bit errors. Setting REQH = 0 will lower the gain  
and reduce the amount of overshoot.  
2-10  
Conexant  
100985A  
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