參數(shù)資料
型號(hào): XRT73R12
廠商: Exar Corporation
英文描述: TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述: 第十二章通道E3/DS3/STS-1線路接口單元
文件頁(yè)數(shù): 26/87頁(yè)
文件大小: 436K
代理商: XRT73R12
XRT73R12
REV. P1.0.3
PRELIMINARY
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
23
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 8.
The LOS condition is cleared within 10 to 255 UI after restoration of the incoming line signal. Figure 9 shows
the LOS declaration and clearance conditions.
E3 LOS Condition:
F
IGURE
8. L
OSS
O
F
S
IGNAL
D
EFINITION
FOR
E3
AS
PER
ITU-T G.775
F
IGURE
9. 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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