参数资料
型号: XRT7300IVTR
厂商: Exar Corporation
文件页数: 29/55页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 SGL 44TQFP
标准包装: 1,000
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: 4.75 V ~ 5.25 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: 带卷 (TR)
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.2
31
Timing Requirements associated with Declaring
and Clearing the LOS Indicator for E3 Applica-
tions
The XRT7300 was designed to meet the ITU-T G.775
specification timing requirements for declaring and
clearing the LOS indicator. In particular, the
XRT7300 declares an LOS between 10 and 255 UI
(or E3 bit-periods) after the actual time the LOS con-
dition occurred. Further, the XRT7300 clears the
LOS indicator within 10 to 255 UI after restoration of
the incoming line signal. Figure 22 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 21. THE SIGNAL LEVELS THAT THE XRT7300 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
FIGURE 22. THE BEHAVIOR THE LOS OUTPUT INDICATOR IN RESPONSE TO THE LOSS OF SIGNAL AND THE RESTO-
RATION OF
SIGNAL
Actual Occurrence
of LOS Condition
Line Signal
is Restored
Time Range for
LOS Declaration
Time Range for
LOS Clearance
G.775
Compliance
G.775
Compliance
0 UI
10 UI
0 UI
10 UI
255 UI
RTIP/
RRing
RLOS Output Pin
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