參數(shù)資料
型號(hào)： DM9301
廠商： Electronic Theatre Controls, Inc.
英文描述： 100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
中文描述： 100Mbps以太網(wǎng)光纖/雙絞線收發(fā)器單芯片
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 125K
代理商： DM9301
DM9301
100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
Final 11
Version: DM9301-DS-F02
May 8, 2000
FX Serial to Parallel Converter
The Serial to Parallel converter receives a serial
data stream from the NRZI to NRZ converter, and
converts the data stream to parallel data to be
presented to the scrambler. The parallel data format
presented to the TX scrambler is 5B coded.
FX Code Group Alignment Monitor
The FX Code Group Alignment block receives non-
aligned 5B data from the FX Serial to Parallel
converter and monitors it for 5B code group
violations. FX Code Group Alignment occurs after
the J/K is detected, and subsequent data is
monitored on a fixed boundary. If a violation is
detected, the FX Code Group Alignment Monitor
block signals the error to the Link Status Monitor
block. In turn, the Link Status Monitor block flashes
the FX error LED (FXERRLED#).
TX Scrambler
The scrambler also receives data from the FX Serial
to Parallel converter. Data from the serial to parallel
conversion block is 5B symbol encoded. The
scrambler is required to control the radiated
emissions (EMI) by spreading the transmit energy
across the frequency spectrum at the media
connector and on the twisted pair cable in 100Base-
TX transmit operation.
By scrambling the data, the total energy presented
to the cable is randomly distributed over a wide
frequency range. Without the scrambler, energy
levels on the cable could peak beyond FCC
limitations at frequencies related to repeated 5B
sequences like continuous transmission of IDLE
symbols. The scrambler output is combined with the
NRZ 5B data from the FX Serial to Parallel
converter via an XOR logic function. The result is a
scrambled data stream with sufficient randomization
to decrease radiated emissions at critical
frequencies.
TX Parallel to Serial Converter
The TX Parallel to Serial converter receives parallel
5B scrambled data from the scrambler and
serializes it (converts it from a parallel to a serial
data stream). The serialized data stream is then
presented to the NRZ to NRZI converter block
TX NRZ to NRZI Converter
After the transmit data stream has been scrambled
and serialized, the data must be NRZI encoded for
compatibility with the TP-PMD standard for
100Base-TX transmission over Category-5
unshielded twisted pair cable.
TX MLT-3 Converter
The MLT-3 conversion is accomplished by
converting the data stream output from the NRZI
encoder into two binary data streams with
alternately phased logic one events.
TX MLT-3 Driver
The two binary data streams created at the MLT-3
converter are fed to the twisted pair output driver
which converts these streams to current sources
and alternately drives either side of the transmit
transformer primary winding resulting in a minimal
current MLT-3 signal.
相關(guān)PDF資料
PDF描述
DM9301F 100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
DM9324 5-Bit Comparator
DM9324N 5-Bit Comparator
DM9328 Dual 8-Bit Shift Register
DM9328N Dual 8-Bit Shift Register
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DM9301F 制造商:未知廠家 制造商全稱:未知廠家 功能描述:100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
DM9301FP 制造商:DAVICOM 制造商全稱:DAVICOM 功能描述:100Mbps Ethernet Fiber/Twisted Pair Single Chip Media Converter
DM9301J 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BCD-To-Decimal Decoder
DM9301J/883 制造商:Rochester Electronics LLC 功能描述:- Bulk
DM9301N 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1-OF-10 DECODERS
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*