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XRT75VL00D Fiches technique(PDF) 35 Page - Exar Corporation

No de pièce XRT75VL00D
Description  E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
PDF  92 Pages
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Fabricant  EXAR [Exar Corporation]
Site Internet  http://www.exar.com
Logo EXAR - Exar Corporation

XRT75VL00D Fiches technique(HTML) 35 Page - Exar Corporation

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XRT75VL00D
REV. 1.0.3
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
30
DISABLING ALOS/DLOS DETECTOR:
For debugging purposes it is useful to disable the ALOS/DLOS detector. Writing a “1” to the ALOS and DLOS
bits disables the LOS detector on a per channel basis.
5.4.2
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
illustrated 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
1<20mV
>90mV
STS-1
1<25mV
>115mV
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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