xrt73r06 Exar Corporation, xrt73r06 Datasheet - Page 33

• Manufacturer Part Number: xrt73r06
• Description: Six Channel Ds3/e3 Line Interface Unit Liu With R3 Technologytm
• Manufacturer: Exar Corporation

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SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
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 18.
F
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
materials, see Figure 19.
F
4.0 THE RECEIVER SECTION
4.1
IGURE
IGURE
RRing_n
RTIP_n
18. R
19. R
Receive Line Interface
ECEIVE
ECEIVE
P
L
Equalizer
INE
ATH
DS-3/E3/STS-1
AGC/
coxial cable. Whether using E3, DS-3 or STS-1, the LIU requires the same bill of
I
Peak Detector
NTERFACE
B
LOCK
D
Slicer
IAGRAM
C
Receiver
ONNECTION
RLOS_n
Detector
LOS
Clock & Data
Recovery
37.5
30
0.01 F
Attenuator
37.5
Jitter
1:1
MUX
75
Channel n
Decoder
HDB3/
B3ZS
RTIP_n
RRing_n
RxNEG/LCV_n
RLOS_n
RxClk_n
RxPOS_n
XRT73R06
REV. 1.0.0