Serial communications

The universal serial communication interface (USCI) modules support multiple serial communication modes. Different USCI modules support different modes.

15p tungxxx 14-03-2017 62 1   Download

This chapter describe the fundamental concepts of point-to-point serial communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting; configure PPP on a serial interface including enabling PPP encapsulation.

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Introduction Data link control layer – often abbreviated simply to data link layer – is concerned with the transfer of data over a serial data link The transmission mode may be either asynchronous or synchronous and based on either a character-oriented or a bit-oriented transmission control protocol The data link layer is fundamental to the operation of all data communication applications

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Introduction Data into a computer (via a keyboard) is encoded by the electronics within the keyboard into an equivalent binary-coded pattern using standard coding schemes: Two most common schemes: EBCDIC (Extended Binary Coded Decimal Interchange Code): 8-bit code ASCII ((American Standards Committee for Information Interchange): 7-bit code

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Establishing a network performance baseline requires collecting key performance data from the ports and devices that are essential to network operation.1 Gather symptoms - Troubleshooting begins with the process of gathering and documenting symptoms from the network, end systems, and users. Stage 2 Isolate the problem - The problem is not truly isolated until a single problem, or a set of related problems, is identified.

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Static NAT – Mapping an unregistered IP address to a registered IP address on a one-to-one basis. Particularly useful when a device needs to be accessible from outside the network.Dynamic NAT – Maps an unregistered IP address to a registered IP address from a group of registered IP addresses. Dynamic NAT also establishes a one-to-one mapping between unregistered and registered IP address, but the mapping could vary depending on the registered address available in the pool, at the time of communication....

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The Data-over-Cable Service Interface Specification (DOCSIS)is an international standard developed by CableLabs, a non-profit research and development consortium for cable-related technologies. • DOCSIS specifies the OSI Layer 1 and Layer 2 requirements: Physical layer-For data signals that the cable operator can use, DOCSIS specifies the channel widths (bandwidths of each channel) as 200 kHz, 400 kHz, 800 kHz, 1.6 MHz, 3.2 MHz, and 6.4 MHz. DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data).

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Limit network traffic to increase network performance. For example, if corporate policy does not allow video traffic on the network, ACLs that block video traffic could be configured and applied. This would greatly reduce the network load and increase network performance. 2. Provide traffic flow control. ACLs can restrict the delivery of routing updates. If updates are not required because of network conditions, bandwidth is preserved. 3. Provide a basic level of security for network access.

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The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn’t stake my life on it….An open security model is the easiest to implement . Simple passwords and server security become the foundation of this model. If encryption is used, it is implemented by individual users or on servers.

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Frame Relay has become the most widely used WAN technology in the world. Large enterprises, governments, ISPs, and small businesses use Frame Relay, primarily because of its price and flexibility. •Moreover, Frame Relay provides greater bandwidth, reliability, and resiliency than private or leased lines. •Frame Relay reduces network costs by using less equipment, less complexity, and an easier implementation.

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Computers make use of relatively short parallel connections between interior components, but use a serial bus to convert signals for most external communications.In a parallel connection, it is wrong to assume that the 8 bits leaving the sender at the same time arrive at the receiver at the same time. Rather, some of the bits get there later than others. This is known as clock skew.

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Networks must be able to transfer data from one device to another with complete accuracy. Data can be corrupted during transmission. For reliable communication, errors must be detected and corrected.Single bit errors are the least likely type of errors in serial data transmission because the noise must have a very short duration which is very rare. However this kind of errors can happen in parallel transmission.

36p hoangchung_dtvt 10-12-2012 82 5   Download

In block coding, the encoder accepts kbit message block and generates n-bit codeword⇒Block-by-block basis
Encoder must buffer an entire message 2 block before generating the codeword
When the message bits come in serially rather than in large blocks, using buffer is undesirable
Convolutional coding

37p feteler 26-11-2012 54 4   Download

An open data communication protocol developed in 1979 Published by Modicon Open structure Flexible Widely known Supplied by many SCADA and HMI software Have OPC Servers 2 serial transmission modes: ASCII 10 bits RTU (Binary) 11 bits Communication interface RS-232/485 Ethernet (TCP/IP) Station Device: 0 ~ 255 Digital input 1xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 1xxxxx: 5 digital for decimal address (0 ~ 65535) Digital output 0xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 0xxxxx: 5 digital for decimal address (0 ~ 65535) Analog input 4xxxx: 4 dig...

14p buisontdtq 04-10-2012 80 15   Download

Purpose of the project án be cung cấp Income change thế và 1 ninh lương authorized by way development and expand public Nghệ nuoi ngao (Serial like and chan nuoi) to duy trị sinh kế nông of the Subject ngheo ven bien in the provincesBắc Trung Bộ. Project this close of a vai games important in job settings a ngành Công Nghiệp nghêu ben Firmware ở field ven bien Bắc domain Trung Việt Nam. Extension of the toán nuoi nghêu already have the tác peer kế cho cộng đồng ngheo ven bien, cung cấp sinh kế change thế via Văn...

51p xinh_la 10-02-2012 90 11   Download

Mô tả tính năng của DS1820: DS1820 là nhiệt kế số có độ phân giải 9-12bit giao tiếp với vi điều khiển trung tâm thông qua 1 dây duy nhất ( 1 wire communication). DS1820 hoạt động với điện áp từ 3V-5.5V có thể được cấp nguồn qua chân DQ- chân trao đổi dữ liệu. Nó có thể đo nhiệt độ trong tầm -55-125oC với độ chính xác +-0.5 oC. Mỗi DS1820 có một Serial code 64bits duy nhất, điều này cho phép kết nối nhiều IC trên cùng đường bus....

10p nvhtb1 07-10-2011 564 195   Download

The Basic Synchronous Serial Port (BSSP) module is a serial interface useful for communicating with other peripheral or microcontroller devices. These peripheral devices may be Serial EEPROMs, shift registers, display drivers, A/D converters, etc. The BSSP module can operate in one of two modes:

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In this lesson we will review a couple of communication peripherals available in all the general-purpose devices in the new PIC24 family. • Asynchronous serial communication interfaces UART1 and UART2, • Synchronous serial communication interfaces SPI1 and SPI2, comparing their relative strengths and limitations for use in embedded-control applications.

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Describe the fundamental concepts of point-to-point serial communication. – Describe key PPP concepts. – Configure PPP encapsulation. – Explain and configure PAP and CHAP authentication.

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Frame Relay. Objectives: In this chapter, you will learn to: Describe the fundamental concepts of Frame Relay technology in terms of enterprise WAN services, including operation, implementation requirements, maps, and Local Management Interface (LMI) operation. Configure a basic Frame Relay permanent virtual circuit (PVC), including configuring and troubleshooting Frame Relay on a router serial interface and configuring a static Frame Relay map.

46p thanhtung_hk 05-11-2010 147 32   Download