參數(shù)資料
型號(hào)： XRT7300IV
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(yè)數(shù)： 34/55頁(yè)
文件大?。?/td> 608K
代理商： XRT7300IV
XRT7300
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. 1.1.1
á
30
3.5.3
Decoder
The HDB3/B3ZS Decoder of the XRT7300 can be
enabled or disabled by either of the following means:
If the XRT7300 is operating in the Hardware Mode:
Enable the HDB3/B3ZS Decoder by pulling the DE-
CODIS input pin (pin 22) to GND. To disable the
HDB3/B3ZS Decoder, pull the DECODIS input pin to
VDD.
If the XRT7300 is operating in the HOST Mode:
Enable the XRT7300 HDB3/B3ZS Decoder by writing
a “0” into the DECODIS bit-field in Command Regis-
ter CR2. To disable the HDB3/B3ZS Decoder, write a
“1” into the DECODIS bit-field.
Enabling/Disabling the HDB3/B3ZS
3.6
The XRT7300 contains circuitry that monitors the fol-
lowing two parameters associated with the incoming
line signals.
1.
The amplitude of the incoming line signal via the
RTIP and RRING inputs; and
LOS D
ECLARATION
/C
LEARANCE
2.
The number of pulses detected (in the incoming
line signal) within a certain amount of time.
If the XRT7300 determines that the incoming line sig-
nal is missing (either 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
XRT7300 declares the LOS condition by toggling the
RLOS output pin “High” and by setting the RLOS bit
field in Command Register 0 to “1”.
If the XRT7300 determines that the incoming line sig-
nal has been restored (e.g., there is sufficient ampli-
tude 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 XRT7300 is based upon ITU-T Recom-
mendation G.775 for both E3 and DS3 applications.
The LOS Declaration and Clearance criteria that the
XRT7300 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 XRT7300 is operating in the E3 Mode, it
declares an LOS Condition if the signal amplitude
drops to -35dB or below. Further, the XRT7300
clears the LOS Condition if the signal amplitude rises
back up to -15dB or above. Figure 21 illustrates the
signal levels at which the XRT7300 asserts and
clears LOS.
COMMAND REGISTER CR2 (ADDRESS = 0X02)
D4
D3
D2
D1
D0
DECODIS ENCODIS ALOSDIS DLOSDIS
REQDIS
0
X
X
X
X
相關(guān)PDF資料
PDF描述
XRT7300 E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
XRT73L02M TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02MIV TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT73L02 2 Channel E3/DS3/STS-1 Line Interface Unit(2通道 E3/DS3/STS-1線接口單元)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XRT7300IV-F 功能描述:外圍驅(qū)動(dòng)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
XRT7300IVTR 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
XRT7300IVTR-F 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
XRT7302IV 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PCM Transceiver
XRT73L00 制造商:EXAR 制造商全稱:EXAR 功能描述:E3/DS3/STS-1 LINE INTERFACE UNIT
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