參數(shù)資料
型號(hào): XRT73R12IB
廠(chǎng)商: EXAR CORP
元件分類(lèi): 數(shù)字傳輸電路
英文描述: TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述: DATACOM, PCM TRANSCEIVER, PBGA420
封裝: 35 X 35 MM, TBGA-420
文件頁(yè)數(shù): 23/87頁(yè)
文件大?。?/td> 436K
代理商: XRT73R12IB
PRELIMINARY
XRT73R12
REV. P1.0.3
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
20
3.0
The receiver is designed so that the LIU can recover clock and data from an attenuated line signal caused by
cable loss or flat loss according to industry specifications. Once data is recovered, it is processed and
presented at the receiver outputs according to the format chosen to interface with a Framer/Mapper or ASIC.
This section describes the detailed operation of various blocks within the receive path. A simplified block
diagram of the receive path is shown in Figure 5.
THE RECEIVER SECTION
F
IGURE
5. R
ECEIVE
P
ATH
B
LOCK
D
IAGRAM
3.1
Physical Layer devices are AC coupled to a line interface through a 1:1 transformer. The transformer provides
isolation and a level shift by blocking the DC offset of the incoming data stream. The typical medium for the
line interface is a 75
coxial cable. Whether using E3, DS-3 or STS-1, the LIU requires the same bill of
materials, see Figure 6.
Receive Line Interface
F
IGURE
6. R
ECEIVE
L
INE
I
NTERFACE
C
ONNECTION
Channel n
HDB3/
B3ZS
Decoder
MUX
AGC/
Equalizer
Peak Detector
LOS
Detector
Slicer
Clock & Data
Recovery
RxClk_n
RxPOS_n
RxNEG/LCV_n
RLOS_n
RTIP_n
RRing_n
DS-3/E3/STS-1
1:1
Receiver
75
RLOS_n
RTIP_n
RRing_n
37.5
0.01
μ
F
37.5
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