參數(shù)資料
型號： XRT73L00AIV
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： E3/DS3/STS-1 LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PQFP44
封裝： 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁數(shù)： 36/53頁
文件大小： 604K
代理商： XRT73L00AIV
XRT73L00
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.2.0
á
33
coder/Decoder, write a “1” into the ENDECDIS bit-
field.
3.6
The XRT73L00 contains circuitry that monitors the
following two parameters associated with the incom-
ing line signals.
1.
The amplitude of the incoming line signal via the
RTIP and RRING inputs; and
2.
The number of pulses detected in the incoming
line signal within a certain amount of time.
If the XRT73L00 determines that the incoming line
signal is missing due to insufficient amplitude or a
lack of pulses in the incoming line signal) then it de-
clares a Loss of Signal (LOS) condition. The
XRT73L00 declares the LOS condition by toggling
LOS D
ECLARATION
/C
LEARANCE
the RLOS output pin “High” and by setting the RLOS
bit field in Command Register 0 to “1”.
If the XRT73L00 determines that the incoming line
signal has been restored (e.g., there is sufficient am-
plitude and pulses in the incoming line signal) then it
clears the LOS condition by toggling the RLOS output
pin “Low” and setting the RLOS bit-field to “0”.
The LOS Declaration/Clearance scheme that is em-
ployed in the XRT73L00 is based upon ITU-T Recom-
mendation G.775 for both E3 and DS3 applications.
The LOS Declaration and Clearance criteria that the
XRT73L00 uses for each of these modes (e.g., E3
and DS3) are presented below.
3.6.1
The LOS Declaration/Clearance Criteria
for E3 Applications
When the XRT73L00 is operating in the E3 Mode, it
declares an LOS Condition if the signal amplitude
drops to -35dB or below. The XRT73L00 clears the
LOS Condition if the signal amplitude rises back up to
-15dB or above. Figure 21 illustrates the signal levels
at which the XRT73L00 asserts and clears LOS.
Timing Requirements associated with Declaring
and Clearing the LOS Indicator for E3 Applica-
tions
The XRT73L00 was designed to meet the ITU-T
G.775 specification timing requirements for declaring
and clearing the LOS indicator. The XRT73L00 de-
clares an LOS between 10 and 255 UI or E3 bit-peri-
ods after the actual time the LOS condition oc-
curred. The XRT73L00 clears the LOS indicator with-
in 10 to 255 UI after restoration of the incoming line
COMMAND REGISTER CR2 (ADDRESS = 0X02)
D4
D3
D2
D1
D0
Reserved ENDECDIS ALOSDIS DLOSDIS REQDIS
X
0
X
X
X
F
IGURE
21. T
HE
S
IGNAL
L
EVELS
THAT
THE
XRT73L00 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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT73L00IV 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LINE INTERFACE|QFP|44PIN|PLASTIC
XRT73L02M 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MES 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
XRT73L02MIV 制造商:EXAR 制造商全稱:EXAR 功能描述:TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MIV-F 功能描述:外圍驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray
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