參數(shù)資料
型號: XRT83L38IB
廠商: Exar Corporation
文件頁數(shù): 32/87頁
文件大小: 0K
描述: IC LIU T1/E1/J1 OCTAL 225BGA
標準包裝: 84
類型: 線路接口裝置(LIU)
驅(qū)動器/接收器數(shù): 8/8
規(guī)程: T1,E1,J1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 225-BGA
供應(yīng)商設(shè)備封裝: 225-BGA(19x19)
包裝: 托盤
XRT83L38
35
OCTAL T1/E1/J1 LH/SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
REV. 1.0.2
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
XRT83L38 Line Interface Unit (LIU). The XRT83L38 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.
PROGRAMMING CONSIDERATIONS
In many applications switching the control of the transmitter outputs and the receiver line impedance to
hardware control will provide faster transmitter ON/OFF switching.
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
Ω
2.45
3.1
Ω
0
1
0
Ω
2
3.1
Ω
0
1
x
12.5
Ω
2
0
Ω
0.68
μF
J1
110
Ω
0
1
0
Ω
2.45
3.1
Ω
0
1
0
1
0
Ω
2
3.1
Ω
0
1
x
13.75
Ω
2
0
Ω
0.68
μF
E1
75
Ω
1
0
Ω
2.45
6.2
Ω
0
1
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
0
Ω
2.45
6.2
Ω
0
1
0
1
0
Ω
2
9.1
Ω
0
1
x
15
Ω
2
0
Ω
0.68
μF
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