參數資料
型號： XRT73L04
廠商： Exar Corporation
英文描述： 4 Channel E3/DS3/STS-1 Line Interface Unit(4通道 E3/DS3/STS-1線接口單元)
中文描述： 4頻道E3/DS3/STS-1線路接口單元（4通道E3/DS3/STS-1線接口單元）
文件頁數： 43/62頁
文件大?。?/td> 781K
代理商： XRT73L04
á
XRT73L04
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
PRELIMINARY
REV. P1.0.5
39
Timing Requirements associated with Declaring
and Clearing the LOS Indicator
The XRT73L04 was designed to meet the ITU-T
G.775 specification timing requirements for declaring
and clearing the LOS indicator. In particular, a chan-
nel declares an LOS between 10 and 255 UI (or E3
bit-periods) after the actual time the LOS condition
occurred. Further, the channel clears the LOS indica-
tor within 10 to 255 UI after restoration of the incom-
ing line signal. Figure 25 illustrates the LOS Declara-
tion and Clearance behavior in response to the Loss
of Signal event and then the restoration of the signal.
3.5.2
for DS3 and STS-1 Applications
When the XRT73L04 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.
The LOS Declaration/Clearance Criteria
1. The Analog LOS (ALOS) Declaration/Clearance
Criteria
A channel declares an Analog LOS (ALOS(n)) Condi-
tion 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.
F
IGURE
25. 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
相關PDF資料
PDF描述
XRT73L06 SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L06IB SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73LC00A E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73LC00AIV E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73LC03A 3 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
相關代理商/技術參數
參數描述
XRT73L04A 制造商:EXAR 制造商全稱:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04AIV 制造商:EXAR 制造商全稱:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04B 制造商:EXAR 制造商全稱:EXAR 功能描述:4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
XRT73L04BES 功能描述:網絡控制器與處理器 IC RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
XRT73L04BIV 功能描述:外圍驅動器與原件 - PCI RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
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