xrt5997 Exar Corporation, xrt5997 Datasheet - Page 25

• Manufacturer Part Number: xrt5997
• Description: Xrt5997 -seven Channel E1 Line Interface Unit
• Manufacturer: Exar Corporation

2.0 The Receive Section
The Receive Sections of the XRT5997 device consists
of the following blocks:
The “Receive Equalizer” block
The “Peak Detector” and “Slicer” block
The “LOS Detector” block
The “Receive Output Interface” block
Figure 7. Recommended Schematic for Interfacing the Receive Sections of the XRT5997
Rev. 1.0.0
Loss of Signal - 1
RxPOS_1
RxNEG_1
Device to the Line for 75 Applications (Transformer-Coupling)
100
1
2
U1
XRT5997
RxPOS_1
RxNEG_1
RxLOS_1
RRing_1
RTIP_1
25
7
8
2.1 Interfacing the Receive Sections to the Line
The design of each channel (within the XRT5997
device) permits the user to transformer-couple or
capacitive-couple the Receive Section to the line.
Additionally, as mentioned earlier, the specification
documents for E1 specify 75 termination loads, when
transmitting over coaxial cable, and 120 loads, when
transmitting over twisted-pair. Figures 7 , through 9
present the various methods that the user can employ
in order to interface the Receivers (of the XRT5997
device) to the line.
R1
18.7
1
4
1:2
PE-65835
5
8
XRT5997
1
J1
BNC