參數(shù)資料
型號(hào): XRT73L00
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): 37/53頁
文件大?。?/td> 604K
代理商: XRT73L00
á
XRT73L00
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.2.0
34
signal. Figure 22 illustrates the LOS Declaration and
Clearance behavior in response to the first loss of sig-
nal event and then afterwards to the restoration of the
signal.
3.6.2
for DS3 and STS-1 Applications
When the XRT73L00 is operating in the DS3 or STS-
1 Modes it declares and clears LOS based on either:
Analog LOS (ALOS) Declaration/Clearance Criteria
or,
Digital LOS (DLOS) Declaration/Clearance Criteria
The LOS Declaration/Clearance Criteria
In the DS3 or STS-1 Modes the LOS output (RLOS)
is simply the logical OR of the ALOS and DLOS
states.
1. The Analog LOS (ALOS) Declaration/Clear-
ance Criteria
The XRT73L00 declares an Analog LOS (ALOS)
Condition if the amplitude of the incoming line signal
drops below a specific amplitude as defined by the
state of the LOSTHR input pin.
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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