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參數(shù)資料
| 型號： | XRT82D20 |
| 廠商： | Exar Corporation |
| 英文描述： | Single Channel E1 Line Interface Unit(單通道E1線接口單元) |
| 中文描述： | 單通道E1線路接口單元（單通道素E1線接口單元） |
| 文件頁數(shù)： | 18/22頁 |
| 文件大?。?/td> | 236K |
| 代理商： | XRT82D20 |
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SINGLE CHANNEL LINE INTERFACE UNIT
XRT82D20
REV. 1.0.6
17
N
OTE
:
Figure 12 and Figure 13indicate that the user should
use a 1.36 :1 STEP-UP transformer, when interfacing the
receiver to the line.
2.0
In order to support diagnostic operations, the
XRT82D20 supports the following loop-back modes:
Local Loopback
Remote Loopback
Digital Loopback
Each of these loop-back modes will be discussed be-
low.
2.1
T
HE
L
OCAL
L
OOP
-B
ACK
M
ODE
When the XRT82D20 is configured to operate in the
Local Loop-Back Mode, the XRT82D20 will ignore
any signals that are input to the RTIP and RRing input
pins. The Transmitting Terminal Equipment will trans-
DIAGNOSTIC FEATURES
mit data into the XRT82D20 via the TPOS, TNEG and
TClk input pins. This data will be processed through
the Transmit Terminal Input Interface and the Pulse
Shaping circuit. Finally, this data will be output to the
line via the TTIP and TRing output pins. Additionally,
this data (which is being output via the TTIP and
TRing output pins) will be looped back into the Re-
ceiver block. As a consequence, this data will also be
processed through the entire Receive Section of the
XRT82D20. After this post-loop-back data has been
processed through the Receive Section it will output,
to the Near-End Receiving Terminal Equipment via
the RPOS and RNEG output pins.
Figure 14, illustrates the path that the data takes
(within the XRT82D20), when the chip is configured
to operate in the Local Loop-Back Mode.
F
IGURE
13. R
ECOMMENDED
S
CHEMATIC
FOR
T
RANSFORMER
-C
OUPLING
THE
XRT82D20
TO
THE
L
INE
FOR
120
A
PPLICATIONS
AND
5 V
OPERATION
ONLY
200
866
866
120
26.1
26.1
1 : 2
1.36 : 1
RTIP
RRING
TTIP
TRING
+5 V
0.1 uF
TVDD
AVDD
TxLEV
TNEG/CODE
TPOS/TData
TClk
RPOS/RData
RNEG/LCV
RClk
AGND
TGND
10 uF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XRT82D20_06 | 制造商:EXAR 制造商全稱:EXAR 功能描述:SINGLE CHANNEL E1 LINE INTERFACE UNIT |
| XRT82D20ES | 功能描述:外圍驅(qū)動器與原件 - PCI 1 CH E1 LIU 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 |
| XRT82D20IW | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Single Ch E1 LIU 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| XRT82D20IW-F | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Single Ch; 3.3V-5V temp -45 to 85C 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 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| XRT82D20IW-F | 制造商:Exar Corporation 功能描述:T1/E1 LIU IC |
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