参数资料
型号: XRT73LC00AIV-F
厂商: Exar Corporation
文件页数: 42/61页
文件大小: 0K
描述: IC LIU STS1/DS3/E3 SGL 44TQFP
标准包装: 160
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: DS3,E3,STS-1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 44-LQFP
供应商设备封装: 44-TQFP(10x10)
包装: 托盘
XRT73LC00A
44
REV. 1.0.2
E3/DS3/STS-1 LINE INTERFACE UNIT
4.0
DIAGNOSTIC FEATURES OF THE XRT73LC00A
The XRT73LC00A supports equipment diagnostic activities by supporting the following Loop-Back modes in
the chip:
Analog Local Loop-Back
Digital Local Loop-Back
Remote Loop-Back.
4.1
The Analog Local Loop-Back Mode
When the XRT73LC00A is configured to operate in the Analog Local Loop-Back Mode, the XRT73LC00A
ignores any signals that are input to the RTIP and RRING input pins. The Transmitting Terminal Equipment
transmits clock and data into the XRT73LC00A via the TPDATA, TNDATA and TCLK input pins. This data is
processed through the Transmit Clock Duty Cycle Adjust PLL and the HDB3/B3ZS Encoder. Finally, this data
outputs to the line via the TTIP and TRING output pins and is looped back into the AGC/Receive Equalizer
Block. Consequently, this data is also processed through the Receive Section of the XRT73LC00A. After this
post-loop-back data has been processed through the Receive Section it outputs to the Near-End Receiving
Terminal Equipment via the RPOS, RNEG, RCLK1 and RCLK2 output pins.
Figure 29 illustrates the path that the data takes when the chip is configured to operate in the Analog Local
Loop-Back Mode.
The XRT73LC00A can be configured to operate in the Analog Local Loop-Back Mode by employing either one
of the following two steps:
FIGURE 27. THE TYPICAL INTERFACE FOR THE TRANSMISSION OF DATA IN A SINGLE-RAIL FORMAT FROM THE
RECEIVE SECTION OF THE XRT73LC00A TO THE RECEIVING TERMINAL EQUIPMENT
FIGURE 28. THE BEHAVIOR OF THE RPOS AND RCLK1 OUTPUT SIGNALS WHILE THE XRT73LC00A IS TRANSMIT-
TING
SINGLE-RAIL DATA TO THE RECEIVING TERMINAL EQUIPMENT
Terminal
Equipment
(E3/DS3 or STS-1
Framer)
Exar E3/DS3/STS-1 LIU
Receive
Logic
Block
RxPOS
RCLK1, 2
RPOS
RCLK1, 2
RCLK1
RPOS
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