參數(shù)資料
型號： PE-68629
廠商： Exar Corporation
英文描述： E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述： E3/DS3/STS-1線路接口單元
文件頁數(shù)： 35/55頁
文件大?。?/td> 608K
代理商： PE-68629
á
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
31
Timing Requirements associated with Declaring
and Clearing the LOS Indicator for E3 Applica-
tions
The XRT7300 was designed to meet the ITU-T G.775
specification timing requirements for declaring and
clearing the LOS indicator. In particular, the
XRT7300 declares an LOS between 10 and 255 UI
(or E3 bit-periods) after the actual time the LOS con-
dition occurred. Further, the XRT7300 clears the
LOS indicator within 10 to 255 UI after restoration of
the incoming line signal. Figure 22 illustrates the
LOS Declaration and Clearance behavior in response
to the first loss of signal event and then afterwards to
the restoration of the signal.
F
IGURE
21. T
HE
S
IGNAL
L
EVELS
THAT
THE
XRT7300 D
ECLARES
AND
C
LEARS
LOS (E3 M
ODE
O
NLY
)
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
22. T
HE
B
EHAVIOR
THE
LOS O
UTPUT
I
NDICATOR
I
N
R
ESPONSE
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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