参数资料
型号: XRT73L03BIV
厂商: Exar Corporation
文件页数: 37/61页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 3CH 120LQFP
标准包装: 72
类型: 线路接口装置(LIU)
驱动器/接收器数: 3/3
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: 120-LQFP
供应商设备封装: 120-LQFP(14x20)
包装: 托盘
XRT73L03B
3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
40
ITU-T Recommendation G.775 for both E3 and DS3
applications.
3.5.1
The LOS Declaration/Clearance Criteria
for E3 Applications
When the XRT73L03B is operating in the E3 Mode, a
given channel declares an LOS Condition if its re-
ceive line signal amplitude drops to -35dB or below.
Further, the channel clears the LOS Condition if its
receive line signal amplitude rises back to -15dB or
above. Figure 26 illustrates the signal levels at which
each channel of the XRT73L03B declares and clears
LOS.
Timing Requirements associated with Declaring
and Clearing the LOS Indicator
The XRT73L03B was designed to meet the ITU-T
G.775 specification timing requirements for declaring
and clearing the LOS indicator. In particular, a chan-
nel declares an LOS between 10 and 255 UI (or E3
bit-periods) after the actual time the LOS condition
occurred. Further, the channel clears the LOS indica-
tor within 10 to 255 UI after restoration of the incom-
ing line signal. Figure 27 illustrates the LOS Declara-
tion and Clearance behavior in response to the Loss
of Signal event and then the restoration of the signal.
FIGURE 26. THE SIGNAL LEVELS THAT THE XRT73L03B DECLARES AND CLEARS LOS
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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