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參數(shù)資料
| 型號： | XRT59L91 |
| 廠商： | Exar Corporation |
| 英文描述： | Single-Chip E1 Line Interface Unit(單片E1 線接口單元) |
| 中文描述： | 單芯片E1線路接口單元（單片素E1線接口單元） |
| 文件頁數(shù)： | 18/28頁 |
| 文件大?。?/td> | 292K |
| 代理商： | XRT59L91 |
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XRT59L91
18
Rev. P2.00
Preliminary
3.0
Diagnostic Features
In order to support diagnostic operations, the
XRT59L91 supports the following loopback modes:
l
Local Loopback
Remote Loopback
l
Each of these loopback modes will be discussed
below.
3.1
The Local Loop-Back Mode
When the XRT59L91 device is configured to operate in
the “Local Loop-back” Mode, the XRT59L91 device will
ignore any signals that are input to the RTIP and RRing
input pins. The “Transmitting Terminal Equipment” will
transmit data (and clock, for “Clocked”
Mode) into the XRT59L91 device via the TxPOS,
TxNEG and TxCLK input pins. This data will be
processed through the “Transmit Terminal Input Inter-
face” 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 “Receive Equalizer” block. As a consequence, this
data will also be processed through the entire “Receive
Section” of the XRT59L91 device. 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 “RxPOS and RxNEG
output pins.
Figure 12, illustrates the path that the data takes
(within the XRT59L91 device), when the chip is config-
ured to operate in the “Local Loop-back” Mode.
Local Loop Back
Path
Transmit Input
Interface
Pulse Shaping
Circuit
Receive
Equalizer
Peak Detector/
Slicer
Receive Output
Interface
LOS
Detector
Local
Loop Back
MUX
Remote
Loop Back
MUX
TTIP
TRing
TxPOS
TxNEG
RTIP
RRing
RLoop
LLoop
RxPOS
RxNEG
RxLOS
TxClk
Figure 12. Illustration of the “Local Loop-back” within the XRT59L91 Device
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| XRT59L91ES | 功能描述:外圍驅(qū)動器與原件 - PCI 1 CH E1 AFE 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 |
| XRT59L91ID | 制造商:Exar Corporation 功能描述: |
| XRT59L91ID-F | 功能描述:外圍驅(qū)動器與原件 - PCI 3.3V or 5V Sngl E1 temp -45 to 85C 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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