xrt83l30 Exar Corporation, xrt83l30 Datasheet - Page 33

• Manufacturer Part Number: xrt83l30
• Description: Xrt83l30 -single-channel T1/e1/j1 Long-haul, Short-haul Line Interface Unit
• Manufacturer: Exar Corporation

REV. 1.0.1
Table 11
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
XRT83L30 Line Interface Unit (LIU). The XRT83L30 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.
100 Ω
110 Ω
120 Ω
75 Ω
T1
J1
E1
E1
summarizes the transmit terminations.
SINGLE-CHANNEL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
TERSEL1
0
0
0
0
0
0
1
1
1
1
1
1
TERSEL0
0
0
0
1
1
1
0
0
0
1
1
1
T
ABLE
0=
1=
T
TRATIO
ABLE
TXTSEL
EXTERNAL
INTERNAL
10: T
0
1
0
0
1
0
0
1
0
0
1
0
0
1
11: T
RANSMIT
RANSMIT
TRATIO
30
T
0
1
x
0
1
x
0
1
x
0
1
x
ERMINATION
T
ERMINATIONS
T
CONTROL
URNS
18.75Ω
SET BY
27.5Ω
R
25Ω
30Ω
BITS
1:2.45
int
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
0Ω
1:2
C
Ω
R
ONTROL
ATIO
n, R
2.45
2.45
2.45
2.45
ext
n
2
2
2
2
2
2
2
2
,
AND
SETTINGS
C
ext ARE SUGGESTED
R
3.1Ω
3.1Ω
3.1Ω
3.1Ω
6.2Ω
9.1Ω
6.2Ω
9.1Ω
ext
0Ω
0Ω
0Ω
0Ω
XRT83L30
Ω
0.68µF
0.68µF
0.68µF
0.68µF
C
0
0
0
0
0
0
0
0
ext