参数资料
型号: XRT73LC00AIVTR
厂商: Exar Corporation
文件页数: 37/61页
文件大小: 0K
描述: IC LIU STS1/DS3/E3 SGL 44TQFP
标准包装: 1,000
类型: 线路接口装置(LIU)
驱动器/接收器数: 1/1
规程: DS3,E3,STS-1
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 44-LQFP
供应商设备封装: 44-TQFP(10x10)
包装: 带卷 (TR)
XRT73LC00A
39
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.0.2
3.6.2
The LOS Declaration/Clearance Criteria for DS3 and STS-1 Applications
When the XRT73LC00A 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
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/Clearance Criteria
The XRT73LC00A 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.
Declaring ALOS
The XRT73LC00A declares an ALOS (Analog LOS) condition whenever the amplitude of the input signal falls
below the Signal Level to Declare ALOS levels specified in Table 4.
Clearing ALOS
The XRT73LC00A clears ALOS whenever the amplitude of the input signal rises above the Signal Level to
Clear ALOS levels specified in Table 4.
NOTE: There is approximately a 2dB hysteresis in the received signal level that exists between declaring and clearing
ALOS in order to prevent chattering in the RLOS output signal.
Monitoring the State of ALOS
FIGURE 23. THE BEHAVIOR OF THE LOS OUTPUT INDICATOR IN RESPONSE TO THE LOSS OF SIGNAL AND THE RES-
TORATION OF
SIGNAL
TABLE 4: THE ALOS (ANALOG LOS) DECLARE AND CLEAR THRESHOLDS FOR A GIVEN SETTING OF LOSTHR AND
REQEN FOR DS3 AND STS-1 APPLICATIONS
APPLICATION
REQEN SETTING
LOSTHR SETTING
SIGNAL LEVEL TO
DECLARE ALOS
SIGNAL LEVEL TO CLEAR
ALOS
DS3
1
<22mV
>90mV
0
1
<17mV
<70mV
STS-1
1
<25mV
>115mV
0
1
<20mV
<90mV
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
RTIP/
RRing
RLOS Output Pin
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