參數(shù)資料
型號: AK2500B
元件分類: 數(shù)字傳輸電路
英文描述: RECEIVER, PDSO24
封裝: SOP-24
文件頁數(shù): 17/17頁
文件大?。?/td> 78K
代理商: AK2500B
ASAHI KASEI
[AK2500B]
MS0005-E-00
- 9 -
1999/12
Digital Loss of Signal(DLOS)
Digital loss detector operates as follows.
-
A digital loss detector monitors consecutive 0s and 1s density in recovered data.
-
RLOS is set high if 175±5 consecutive 0s is detected.
-
RPDATA,RNDATA are set low if ALOS is detected.
-
RLOS is set low if 33% 1s density (58 1s in 175 consecutive bits) and no consecutive 100 bits of 0s are
detected.
175 +/- 5 bits of consecutive
0s in the incoming data
Normal Operation
RCLK
: Recovered from RIN data
RPDATA : Recovered data
RNDATA : Recovered data
RLOS
: Low
DLOS
RCLK
: Recovered from RIN data
RPDATA : Recovered data
RNDATA : Recovered data
RLOS
: High
ALOS
RCLK
: Recovered from EXCLK
RPDATA : Low
RNDATA : Low
RLOS
: High
175bits of the incoming data
includes the following data.
1) 58bits of 1s (33% 1s density)
2) No 100bits of consecutive 0s
<
Clear Alarm
Threshold
Level
Set Alarm
Threshold
Level
Peak level of
the incoming
data
>
Peak level of
the incoming
data
Fig. 2
Loss of Signal state diagram
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