参数资料
型号: XRT83SL216IB
厂商: Exar Corporation
文件页数: 18/42页
文件大小: 0K
描述: IC LIU SH E1 16CH 289STBGA
标准包装: 84
类型: 线路接口装置(LIU)
驱动器/接收器数: 16/16
规程: T1,E1,J1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 289-LFBGA
供应商设备封装: 289-STBGA(15x15)
包装: 托盘
XRT83SL216
23
REV. 1.0.0
16-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT
3.1.3
Digital Loopback
With digital loopback activated, the transmit input data at TCLK/TPOS/TNEG is looped back to the receive
output data at RCLK/RPOS/RNEG. The receive input data at RTIP/RRING is ignored while valid transmit
output data continues to be sent to the line.
A simplified block diagram of digital loopback is shown in
FIGURE 17. SIMPLIFIED BLOCK DIAGRAM OF DIGITAL LOOPBACK
3.2
Interfacing the Transmit Section of the XRT83L216 to the Line
ITU-T G.703 specifies that the E1 line signal can be transmitted over coaxial cable and terminated with 75 or
transmitted over twisted-pair and terminated with 120.
In both applications (e.g., 75 or 120, the user is advised to interface the Transmitter to the Line, in the man-
ner as depicted in Figure 18 and Figure 19, respectively.
FIGURE 18. INTERFACING THE XRT83L216 TO THE LINE FOR 75
APPLICATIONS (1 CHANNEL SHOWN)
Encoder
Decoder
Timing
Control
Data and
Clock
Recovery
JA
Tx
Rx
TAOS
TTIP
TRING
RTIP
RRING
TCLK
TPOS
TNEG
RCLK
RPOS
RNEG
+3.3 V
R Load
75
18.7
9.1
9.1
2 :1
2 : 1
RTIP
RRING
TTIP
TRING
0.1
F
TVDD
AVDD
TNEG/CODE
TPOS/TData
TClk
RPOS/RData
RNEG/LCV
RClk
AGND
TGND
10
F
Rx Input
Tx Output
75
Coax
75
Coax
75
Signal
Source
RVDD
0.1
F
0.1
F
Ferrite
Bead
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