參數(shù)資料
型號: XRT75R06IB
廠商: EXAR CORP
元件分類: 數(shù)字傳輸電路
英文描述: SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
中文描述: DATACOM, PCM TRANSCEIVER, PBGA217
封裝: 23 X 23 MM, BGA-217
文件頁數(shù): 24/63頁
文件大?。?/td> 350K
代理商: XRT75R06IB
XRT75R06
REV. 1.0.0
á
SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR
21
3.5.3
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 is defined as no transitions for 10 to 255 consecutive zeros. No
transitions is defined as a signal level between 15 and 35 dB below the normal. This is illustrated in Figure 9.
The LOS condition is cleared within 10 to 255 UI after restoration of the incoming line signal. Figure 10 shows
the LOS declaration and clearance conditions.
E3 LOS Condition:
F
IGURE
9. L
OSS
O
F
S
IGNAL
D
EFINITION
FOR
E3
AS
PER
ITU-T G.775
F
IGURE
10. L
OSS
OF
S
IGNAL
D
EFINITION
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
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
255 UI
RTIP/
RRing
RLOS Output Pin
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