參數(shù)資料
型號(hào): XRT73LC00AIV
廠商: Exar Corporation
文件頁(yè)數(shù): 36/61頁(yè)
文件大?。?/td> 0K
描述: IC LIU STS1/DS3/E3 SGL 44TQFP
標(biāo)準(zhǔn)包裝: 160
類型: 線路接口裝置(LIU)
驅(qū)動(dòng)器/接收器數(shù): 1/1
規(guī)程: DS3,E3,STS-1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 44-LQFP
供應(yīng)商設(shè)備封裝: 44-TQFP(10x10)
包裝: 托盤
XRT73LC00A
38
REV. 1.0.2
E3/DS3/STS-1 LINE INTERFACE UNIT
3.6.1
The LOS Declaration/Clearance Criteria for E3 Applications
When the XRT73LC00A is operating in the E3 Mode, it declares an LOS Condition if the signal amplitude
drops to -35dB or below. The XRT73LC00A clears the LOS Condition if the signal amplitude rises back up to -
15dB or above. Figure 22 illustrates the signal levels at which the XRT73LC00A asserts and clears LOS.
Timing Requirements associated with Declaring and Clearing the LOS Indicator for E3 Applications
The XRT73LC00A was designed to meet the ITU-T G.775 specification timing requirements for declaring and
clearing the LOS indicator. The XRT73LC00A declares an LOS between 10 and 255 UI or E3 bit-periods after
the actual time the LOS condition occurred. The XRT73LC00A clears the LOS indicator within 10 to 255 UI
after restoration of the incoming line signal. Figure 23 illustrates the LOS Declaration and Clearance behavior
in response to the first loss of signal event and then afterwards to the restoration of the signal.
FIGURE 22. THE SIGNAL LEVELS THAT THE XRT73LC00A DECLARES AND CLEARS LOS (E3 MODE ONLY)
0 dB
-12 dB
-15dB
-35dB
Maximum Cable Loss for E3
LOS Signal Must be Declared
LOS Signal Must be Cleared
LOS Signal may be Cleared or Declared
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