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XRT83SL38IB Datasheet(PDF) 37 Page - Exar Corporation

Part # XRT83SL38IB
Description  OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER
PDF  88 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT83SL38IB Datasheet(HTML) 37 Page - Exar Corporation

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XRT83SL38
35
REV. 1.0.2
OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
diagram for T1 (100
Ω) in the external termination mode. Figure 12 is a simplified block diagram for E1 (75Ω) in
the external termination mode.
Table 11 summarizes the transmit terminations.
REDUNDANCY APPLICATIONS
Telecommunication system design requires signal integrity and reliability. When a T1/E1 primary line card has
a failure, it must be swapped with a backup line card while maintaining connectivity to a backplane without
losing data. System designers can achieve this by implementing common redundancy schemes with the
XRT83SL38 Line Interface Unit (LIU). The XRT83SL38 offers features that are tailored to redundancy
applications while reducing the number of components and providing system designers with solid reference
designs. These features allow system designers to implement redundancy applications that ensure reliability.
The Internal Impedance mode eliminates the need for external relays when using the 1:1 and 1+1 redundancy
schemes.
TABLE 10: TRANSMIT TERMINATION CONTROL
TRATIO
TURNS RATIO
0
1:2.45
1
1:2
TABLE 11: TRANSMIT TERMINATIONS
TERSEL1
TERSEL0
TXTSEL
TRATIO
Rint Ω
n
Rext Ω
Cext
0=EXTERNAL
SET BY
CONTROL
BITS
n, Rext, AND Cext ARE SUGGESTED
SETTINGS
1=INTERNAL
T1
100
Ω
0
0
0
0
0
Ω
2.45
3.1
Ω
0
0
0
0
1
0
Ω
2
3.1
Ω
0
0
0
1
x
12.5
Ω
2
0
Ω
0.68
μF
J1
110
Ω
0
1
0
0
0
Ω
2.45
3.1
Ω
0
0
1
0
1
0
Ω
2
3.1
Ω
0
0
1
1
x
13.75
Ω
2
0
Ω
0.68
μF
E1
75
Ω
1
0
0
0
0
Ω
2.45
6.2
Ω
0
1
0
0
1
0
Ω
2
9.1
Ω
0
1
0
1
x
9.4
Ω
2
0
Ω
0.68
μF
E1
120
Ω
1
1
0
0
0
Ω
2.45
6.2
Ω
0
1
1
0
1
0
Ω
2
9.1
Ω
0
1
1
1
x
15
Ω
2
0
Ω
0.68
μF



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