參數(shù)資料
型號(hào): XRT7302
廠商: Exar Corporation
英文描述: 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
中文描述: 2頻道E3/DS3/STS-1線路接口單元(2通道E3/DS3/STS-1線接口單元)
文件頁(yè)數(shù): 42/62頁(yè)
文件大?。?/td> 715K
代理商: XRT7302
XRT7302
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
á
PRELIMINARY
REV. 1.1.6
38
Timing Requirements associated with Declaring
and Clearing the LOS Indicator
The XRT7302 was designed to meet the ITU-T G.775
specification timing requirements for declaring and
clearing the LOS indicator. In particular, a channel of
the XRT7302 declares an LOS between 10 and 255
UI (or E3 bit-periods) after the actual time the LOS
condition occurred. The channel clears the LOS indi-
cator within 10 to 255 UI after restoration of the in-
coming line signal. Figure 21 illustrates the LOS Dec-
laration and Clearance behavior in response to the
Loss of Signal event and then the restoration of the
signal.
F
IGURE
20. T
HE
S
IGNAL
L
EVELS
AT
WHICH
THE
XRT7302
DECLARES
AND
CLEARS
LOS
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
F
IGURE
21. T
HE
B
EHAVIOR
THE
LOS O
UTPUT
I
NDICATOR
IN
RESPONSE
TO
THE
L
OSS
OF
S
IGNAL
AND
THE
R
ESTO
-
RATION
OF
S
IGNAL
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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