參數(shù)資料
型號(hào)： XRT73L04BIV-F
廠商： Exar Corporation
文件頁(yè)數(shù)： 40/64頁(yè)
文件大小： 0K
描述： IC LIU E3/DS3/STS-1 4CH 144LQFP
標(biāo)準(zhǔn)包裝： 60
類型： 線路接口裝置（LIU）
驅(qū)動(dòng)器/接收器數(shù)： 4/4
規(guī)程： DS3，E3，STS-1
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 144-LQFP
供應(yīng)商設(shè)備封裝： 144-LQFP（20x20）
包裝： 托盤
XRT73L04B
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.1
41
3.5.2
The LOS Declaration/Clearance Criteria
for DS3 and STS-1 Applications
When the XRT73L04B is operating in the DS3 or
STS-1 Mode, then each channel declares and clears
LOS based upon the following two criteria.
Analog LOS (ALOS) Declaration/Clearance Crite-
ria
Digital LOS (DLOS) Declaration/Clearance Crite-
ria
In the DS3 Mode, the LOS output (RLOS) is simply
the logical "OR" of the ALOS and DLOS states.
1. The Analog LOS (ALOS) Declaration/Clearance
Criteria
A channel declares an Analog LOS (ALOS_(n)) Con-
dition if the amplitude of the incoming line signal
drops below a specific amplitude as defined by the
voltage at the LOSTHR input pin, and whether the
Receive Equalizer is enabled or not.
Table 5 presents the various voltage levels at the
LOSTHR input pin, the state of the Receive Equalizer
and the corresponding ALOS (Analog LOS) threshold
amplitudes.
Declaring ALOS
A channel(n) declares ALOS_(n) whenever the ampli-
tude of the receive line signal falls below the Signal
Level to Declare ALOS levels, as specified inTable 5.
Clearing ALOS_(n)
A channel(n) clears ALOS_(n) whenever the ampli-
tude of the receive line signal increases above the
Signal Level to Clear ALOS levels, as specified in
There is approximately a 2dB hysteresis in the re-
ceived signal level that exists between declaring and
FIGURE 27. THE BEHAVIOR OF THE LOS OUTPUT INDICATOR IN RESPONSE TO THE LOSS OF SIGNAL AND THE RES-
TORATION OF
SIGNAL
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
TABLE 5: THE ALOS (ANALOG LOS) DECLARE AND CLEAR THRESHOLDS FOR A GIVEN SETTING OF LOSTHR AND
REQEN (DS3 AND STS-1 APPLICATIONS)
APPLICATION
REQEN SETTING
LOSTHR SETTING
SIGNAL LEVEL TO
DECLARE ALOS
SGNAL LEVEL TO CLEAR
ALOS
DS3
1
<22mV
>90mV
01
<17mV
<70mV
STS-1
1
<25mV
>115mV
01
<20mV
<90mV
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