To this day, Power over Ethernet (PoE) continues to gainpopularity in today’s networking world. The 12.95Wdelivered to the Powered Device (PD) input supplied bythe Power Sourcing Equipment (PSE) is a universal supply.Each PD provides its own DC/DC conversion from anominal 48V supply, thus eliminating the need for a correctvoltage wall Adapter. However, higher power devicescan not take advantage of standard PoE because of itspower limitations, and must rely on a large wall Adapteras their primary supply. The new LTC4268-1 breaks thispower barrier by allowing for power of up to 35W for suchpower-hungry 2-pair PoE applications. The LTC4268-1provides a complete solution by integrating a high powerPD interface control with an isolated fl yback controller.
介紹了基于單片機(jī)C8051F020的通用串口適配器的設(shè)計(jì)與實(shí)現(xiàn)方法，即由單片機(jī)控制的智能化一對(duì)多口收發(fā)信號(hào)轉(zhuǎn)換器。通過(guò)采用C51對(duì)單片機(jī)進(jìn)行編程，控制與RS-232（標(biāo)準(zhǔn)RS-232電平）、RS232(TTL電平)、RS-422接口的數(shù)據(jù)通信；采用C++ Builder作為開(kāi)發(fā)平臺(tái)，通過(guò)RS-232接口實(shí)現(xiàn)上位機(jī)對(duì)適配器各個(gè)通信端口的控制。
Abstract:
Design and realization of a universal serial port Adapter based on the MCU C8051F020 are introduced.The Adapter is an intelligent one-to-more receiving and transmitting signal converter controlled by the MCU. By programming the MCU with the language C51,MCU control data communication between the MCU and RS-232(RS-232 level),RS-232(TTL level),RS-422 port; Using C++ Builder as the development plane, by one RS232 port, the upper PC can control each of the communication port of the Adapter.
基于單DSP的VoIP模擬電話適配器研究與實(shí)現(xiàn):提出和實(shí)現(xiàn)了一種新穎的基于單個(gè)通用數(shù)字信號(hào)處理器(DSP)的VoIP模擬電話適配器方案。DSP的I/O和存儲(chǔ)資源非常有限，通常適于運(yùn)算密集型應(yīng)用，不適宜控制密集型應(yīng)用[5]。該系統(tǒng)高效利用單DSP的I/O和片內(nèi)外存儲(chǔ)器資源，采用μC/OS-II嵌入式實(shí)時(shí)操作系統(tǒng)，支持SIP和TCP-UDP/IP協(xié)議，通過(guò)LAN或者寬帶接入，使普通電話機(jī)成為Internet終端，實(shí)現(xiàn)IP電話。該系統(tǒng)軟硬件結(jié)構(gòu)緊湊高效，運(yùn)行穩(wěn)定，成本低，具有廣闊的應(yīng)用前景。關(guān)鍵詞：模擬電話適配器；IP電話；數(shù)字信號(hào)處理器；μC/OS-II
【Abstract】This paper presents a VoIP ATA solution based on a single digital signal processor (DSP). DSPs are suitable for arithmetic-intensiveapplication and unsuitable for control-intensive application because of the limitation of I/O and memory resources. This solution is based on a 16-bitfixed-point DSP and μC/OS-II embedded real-time operating system. It makes good use of the limited resources, supports SIP and TCP-UDP/IPprotocol. It can connect the analog telephone to Internet and realize the VoIP application. This system has a great future for its high efficiency andlow cost.【Key words】Analog telephone Adapter (ATA); Voice over Internet protocol (VoIP); Digital signal processor (DSP); μC/OS-II
Research and Implementation of VoIPATA Based on Single DSP
MAXQUSBJTAGOW評(píng)估板軟件:關(guān)鍵特性 Easily Load and Debug Code Interface Provides In-Application Debugging Features Step-by-Step Execution Tracing Breakpointing by Code Address, Data Memory Address, or Register Access Data Memory View and Edit Supports Logic Levels from 1.1V to 3.6V Supports JTAG and 1-Wire Protocols Each Adapter Has Its Own Unique Serial ID, Allowing Multiple Adapters to be Connected Without COM Port Conflicts Has In-Field Upgradable Capability if Firmware Needs to be Upgraded Enclosure Protects from Shorts and ESD
superpro 3000u 驅(qū)動(dòng)
PIC16C65B@QFP44 [SA245]
PIC16C65B: Part number
QFP44: Package in QFP44
SA245: Adapter purchase number
AM29DL320GT@FBGA48 [SA642+B026]
AM29DL320GT: Part number
FBGA48: Package in FBGA48
SA642: Adapter purchase number (Top board with socket)
B026: Adapter purchase number (Bottom board, exchangable for different parts)
87C196CA@PLCC68(universal Adapter) [PEP+S414T]
87C196CA: Part number
PLCC68: Package in PLCC68
universal Adapter: this Adapter is valid for all parts in this package
PEP: The PEP (Pin-driver Expansion Pack necessary to work with the Adapter S414T)
S414T: Adapter purchase number (Universal for all parts in this package)
S71PL127J80B@FBGA64(special Adapter) [(SA642A-B079A-Y096AF001)]
S71PL127J80B: Part number
FBGA64: Package in FBGA64
special Adapter: this Adapter is valid for this
MAXQUSBJTAGOW評(píng)估板軟件:關(guān)鍵特性 Easily Load and Debug Code Interface Provides In-Application Debugging Features Step-by-Step Execution Tracing Breakpointing by Code Address, Data Memory Address, or Register Access Data Memory View and Edit Supports Logic Levels from 1.1V to 3.6V Supports JTAG and 1-Wire Protocols Each Adapter Has Its Own Unique Serial ID, Allowing Multiple Adapters to be Connected Without COM Port Conflicts Has In-Field Upgradable Capability if Firmware Needs to be Upgraded Enclosure Protects from Shorts and ESD
superpro 3000u 驅(qū)動(dòng)
PIC16C65B@QFP44 [SA245]
PIC16C65B: Part number
QFP44: Package in QFP44
SA245: Adapter purchase number
AM29DL320GT@FBGA48 [SA642+B026]
AM29DL320GT: Part number
FBGA48: Package in FBGA48
SA642: Adapter purchase number (Top board with socket)
B026: Adapter purchase number (Bottom board, exchangable for different parts)
87C196CA@PLCC68(universal Adapter) [PEP+S414T]
87C196CA: Part number
PLCC68: Package in PLCC68
universal Adapter: this Adapter is valid for all parts in this package
PEP: The PEP (Pin-driver Expansion Pack necessary to work with the Adapter S414T)
S414T: Adapter purchase number (Universal for all parts in this package)
S71PL127J80B@FBGA64(special Adapter) [(SA642A-B079A-Y096AF001)]
S71PL127J80B: Part number
FBGA64: Package in FBGA64
special Adapter: this Adapter is valid for this
