data link layer protocols in wan

... Data Link Layer Protocols- The Frame 31 • Remember that although there are many different Data Link layer protocols that describe Data Link layer frames, each frame ... this chapter, you will be able to: • Explain the role of Data Link layer protocols in data transmission. • Describe how the Data Link layer prepares data for transmission on network media. • ... very simple. • In point-to-point networks, if data can only flow in one direction at a time, it is operating as a half-duplex link. If data can successfully flow across the link from each node...

Ngày tải lên: 22/12/2013, 13:17

Ngày tải lên: 30/03/2014, 07:20

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 21/08/2012, 16:18

... Session Network Data link Physical zone 1 zone 2 H2:H.323 Protocols in relation to the OSI model G.711 G.722 G.728 G.729 G.723.1.1 Presentation H.261 ... H.323 RAS signaling zone 1 zone 2 H×nh 3: kiÕn tróc t¹i Terminal H.323 cña Cisco Video Conference Architecture a typical H.323 Terminal Video I/O Equipment Audio I/O Equipment User Data Applications System Control User Interface H.225.0 Layer Locall Area Network Intererface recovery Path Delay Video ... Data Applications System Control User Interface H.225.0 Layer Locall Area Network Intererface recovery Path Delay Video codec H261, H263 Audio condec G711, G722, G723, G728 G729 System control 1. Setup 2. Alerting 3....

Ngày tải lên: 24/08/2012, 21:11

... increases: ❍ frame sent at t 0 collides with other frames sent in [t 0 -1,t 0 +1] 5: DataLink Layer 5-2 Chapter 5: The Data Link Layer Our goals: ❒ understand principles behind data link layer ... semi- autonomous ❒ link & physical layers sending node frame rcving node datagram frame adapter adapter link layer protocol 5: DataLink Layer 5-36 Link Layer ❒ 5.1 Introduction and services ❒ 5.2 ... detection and correction 5: DataLink Layer 5-16 Multiple Access Links and Protocols Two types of “links”: ❒ point-to-point ❍ PPP for dial-up access ❍ point-to-point link between Ethernet switch...

Ngày tải lên: 12/09/2012, 15:06

... VHF Digital Link Thuật ngữ VHF Digital Link được đề ra bởi hiệp hội thông tin di động hàng không ICAO (AMCP) vào cuộc họp đầu tiên tháng 10 năm 1991, với những hệ thống thông tin liên lạc số ... trên vùng lãnh thổ Việt Nam. Luận văn “ ỨNG DỤNG CỦA VHF DATA LINK MODE 4 TRONG MÔI TRƯỜNG CNS/ ATM ” nghiên cứu công nghệ kỹ thuật VHF Data Link Mode 4, một liên kết dữ liệu số sử dụng sóng VHF ... (thoại và dữ liệu), và VDL mode4 - (dữ liệu). + SSR Mode S - (dữ liệu) + HF Data link – (dữ liệu). Các dịch vụ thông tin cho phép các mạng dữ liệu điện tử hàng không, liên lạc không/địa và địa/địa...

Ngày tải lên: 22/11/2012, 09:13

Ngày tải lên: 23/08/2013, 10:37

Ngày tải lên: 29/09/2013, 20:20

... remove existing records. The DataReader class will be examined to retrieve the correct data into newly instantiated User objects in each of the Find* methods. Listing 8–3. Database Interaction ... UserMapper(string connectionString) { _connectionString = connectionString; } private string _connectionString; private IDbConnection _databaseConnection; private bool ConnectToDatabase(string ... using either the LINQ query syntax or the built -in IEnumerable extension methods (see Listing 8–5). Listing 8–5. Access a User by Name Using Both Syntaxes DataContext dataContext = new DataContext(connection);...

Ngày tải lên: 03/10/2013, 01:20

... Editing Manager: Lynette Skinner Editor: Mick Alberts, Jennifer Linn Production Manager: Miracle Davis Print Coordinators: Linda Lu Cannon (Write Stuff), Marlene Lambert (Online Training Solutions, ... To define how CRM is used in the physical design. Lead -in In this topic, you will learn how and when to include CRM in your physical design. Module 9: The Transactional Data Access Layer ... Purchasing, as shown in the preceding slide, incorporates several principles: ! The Iterator design pattern is used to represent data sets. ! There is one design class for each entity in the database....

Ngày tải lên: 05/11/2013, 12:15

... signaling protocols perform plays a critical role in designing, building, maintaining, and troubleshooting a Cisco VoIP implementation. Each proto- col also plays a direct role in implementing ... Bachelors of Science in Mechanical Engineering and a Masters of Science in Mechanical Engineering from Bradley University in P eoria, IL. Chris can be reached at chrisolsen@earthlink.net. Copyright ... in product selection and integration. Specifically, Cisco has predominately implemented the following five different signal- ing protocols amongst their rapidly expanding telephony product line: •...

Ngày tải lên: 10/12/2013, 14:15

... PreRoutingQueue List of messages waiting for the advanced queuing engine to determine the route. Destination Queue List of messages currently being sent, or waiting to be sent to a destination ... f. In the My incoming mail server is a drop-down box, click IMAP . g. In the Incoming mail (POP3, IMAP or HTTP) server box, type your_servername. nwtraders.msft h. In the Outgoing ... Next . b. In the E-Mail address box, type your_username @nwtraders.msft and then click Next . c. In the My incoming mail server is a list, click IMAP . d. In the Incoming mail (POP3,...

Ngày tải lên: 10/12/2013, 16:15

... Editing Manager: Lynette Skinner Editor: Mick Alberts, Jennifer Linn Production Manager: Miracle Davis Print Coordinators: Linda Lu Cannon (Write Stuff), Marlene Lambert (Online Training Solutions, ... Nontransactional Data Access Layer # ## # Introduction to the Data Access Layer ! The Business Problem ! Splitting the DAL The DAL buffers the entire system from the underlying data services. ... to data services for creating, updating, or deleting is accomplished through the DAL. In this section, the DAL is introduced and discussed in the context of the business problem for accessing...

Ngày tải lên: 21/12/2013, 06:17

... trường hợp về sự cố mạng có thể do phần cứng hay phần mềm: Phần cứng (Lớp Physical, Data Link) : Đèn liên kết (Link ) của card mạng không sáng Kiểm tra đầu nối card mạng và đầu cáp nối trên HUB/SWITCH ... tra kết nối vật lý – Click nút Start -> Run -> gõ lệnh cmd cửa sổ command line hiện ra -> gõ lệnh ping đến địa chỉ IP của Default gateway mạng đơn vị mình ( Default gateway mạng 172.28.x.0 ... là 172.28.111.1 – Nếu thành công qua bước 2. – Nếu không thành công : + Xem xét lại thông tin cấu hình mạng đã đúng chưa. Nếu sai thì thay đổi lại cho đúng và thử lại bước 1. ...

Ngày tải lên: 23/12/2013, 03:17

... Purchasing transactional DAL. Module 9: The Transactional Data Access Layer 3 The Business Problem DAL Connected Business Logic Layer Disconnected Business Logic Layer Facade Layer Web ... Editing Manager: Lynette Skinner Editor: Mick Alberts, Jennifer Linn Production Manager: Miracle Davis Print Coordinators: Linda Lu Cannon (Write Stuff), Marlene Lambert (Online Training Solutions, ... define how CRM is used in the physical design. Lead -in In this topic, you will learn how and when to include CRM in your physical design. 28 Module 9: The Transactional Data Access Layer...

Ngày tải lên: 17/01/2014, 09:20

... Recipe 1.13 Using the Data Link Properties Dialog Box Problem You want to display the Data Link Properties dialog b ox from an application so that users can create their own database connections ... from the COM tab in Visual Studio .NET's Add Reference Dialog. The sample code contains a single event handler: Data Link Dialog Button.Click Creates and displays a Data Link Properties ... they can from the Server Explorer window in the Visual Studio .NET IDE. Solution Use COM interop with the OLE DB Service Component to display the Data Link Properties dialog box. You'll...

Ngày tải lên: 26/01/2014, 10:20

... Balanced (LAPB)  Part of X.25 (ITU-T)  Subset of HDLC - ABM  Point to point link between system and packet switching network node  Link Access Procedure, D-Channel  ISDN (ITU-D)  ABM  Always ... i  Transmitter goes back to frame i and retransmits William Stallings Data and Computer Communications Chapter 7 Data Link Control Cyclic Redundancy Check  For a block of k bits transmitter ... - Diagram Flow Control  Ensuring the sending entity does not overwhelm the receiving entity  Preventing buffer overflow  Transmission time  Time taken to emit all bits into medium  Propagation...

Ngày tải lên: 16/02/2014, 08:20

... 3. 11.2 11-1 FRAMING 11-1 FRAMING The data link layer needs to pack bits into The data link layer needs to pack bits into frames frames , so , so that each frame is distinguishable from another. ... 11.40 The send window is an abstract concept defining an imaginary box of size 2 m − 1 with three variables: S f , S n , and S size . Note 11.4 Figure 11.2 Byte stuffing and unstuffing 11.31 Algorithm ... frame is distinguishable from another. Our postal system practices a type of framing. The simple postal system practices a type of framing. The simple act of inserting a letter into an envelope...

Ngày tải lên: 16/02/2014, 20:20