参数资料
型号: XRT73L02MIV-F
厂商: Exar Corporation
文件页数: 25/46页
文件大小: 0K
描述: IC LIU E3/DS3/STS-1 2CH 100TQFP
标准包装: 90
类型: 线路接口装置(LIU)
驱动器/接收器数: 2/2
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: 100-LQFP
供应商设备封装: 100-TQFP(14x14)
包装: 托盘
xr
XRT73L02M
TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.0
29
RLOS is the logical OR of the DLOS and ALOS states. When the RLOS condition occurs the RLOS_n output
pin is toggled “High” and the RLOS_n bit is set to “1” in the status control register.
DISABLING ALOS/DLOS DETECTION:
For debugging purposes it is useful to disable the ALOS and/or DLOS detection. Setting both ALOSDIS_n and
DLOSDIS_n bits disables the LOS detection on a per channel basis.
5.0.4.2
E3 LOS Condition:
If the level of incoming line signal drops below the threshold as described in the ITU-T G.775 standard, the
LOS condition is detected. Loss of signal level is defined to be between 15 and 35 dB below the normal level. If
the signal drops below 35 dB for 175 ± 75 consecutive pulse periods, LOS condition is declared. This is illus-
trated in Figure 19.
TABLE 10: THE ALOS (ANALOG LOS) DECLARATION AND CLEARANCE THRESHOLDS FOR A GIVEN SETTING OF
REQEN (DS3 AND STS-1 APPLICATIONS)
APPLICATION
REQEN SETTING
SIGNAL LEVEL TO DECLARE ALOS SIGNAL LEVEL TO CLEAR ALOS
DS3
0<17 mV
>70 mV
1<20 mV
>90 mV
STS-1
0<20 mV
>90 mV
1<25 mV
>115 mV
FIGURE 19. LOSS OF SIGNAL DEFINITION FOR E3 AS PER ITU-T G.775
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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