multiple access protocols in data link layer ppt

... 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 ... Explain the role of Data Link layer protocols in data transmission. • Describe how the Data Link layer prepares data for transmission on network media. • Describe the different types of media access ... 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

... extremely large in the case of unconstrained channel access, resulting in a low inherent statistical multiplexing gain. By combining CDMA with PRMA, it is possible to control the access of users ... 46 2.6 Summary 48 3 Multiple Access in Cellular Communication Systems 49 3.1 Multiple Access and the OSI Layers 49 3.2 Basic Multiple Access Schemes 53 3.3 Medium Access Control in 2G Cellular Systems ... Time-Division Duplexing 264 6.3.1 Approaches to Time-Division Duplexing 264 6.3.2 TDD with Alternating Uplink and Downlink Slots 266 6.3.3 MD FRMA for TDD with a Single Switching-Point per Frame 266 6.4...

Ngày tải lên: 02/03/2013, 16:59

... 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

... Configurable Congestion Control in Data Transport Services Yunhong Gu and Robert L. Grossman Laboratory for Advanced Computing National Center for Data Mining University of Illinois at Chicago November ... Work  Keep improving  More built -in congestion control package  More configuration abilities (e.g., data reliability and timeliness) 1 :: 23 udt.sourceforge.net Supporting Configurable Congestion ... :: 23 udt.sourceforge.net Similarity and Overhead  CTCP vs. Linux TCP  Aggregate throughput  Jain’s fairness index  Stability index (standard deviation) Flow # Throughput Fairness Stability TCP...

Ngày tải lên: 15/01/2014, 15:59

... 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 ... extended to multiples of 7 bits  LSB of each octet indicates that it is the last octet (1) or not (0)  All ones (11111111) is broadcast Other DLC Protocols (LAPB,LAPD)  Link Access Procedure, ... 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...

Ngày tải lên: 16/02/2014, 08:20

... In multi-channel WLANs the common hopping approach is used for example in Channel-Hopping Multiple Access (CHMA) which was introduced in [11]. In addition, in the context of CRNs at least SYN-MAC ... T.Lengthsof these intervals are predetermined and fixed and hence, the intervals determ ine the average access delay as well. We set T atim =0.2·T c and T =0.8·T c since these values were used in the initial ... probabilities are derived in Appendix B. The amount of successful data negotiations during an ATIM window is on average E [ packets ] = P s g a T atim . (18) In the beginning of each ATIM window all the...

Ngày tải lên: 20/06/2014, 22:20

... carrier frequency offset (CFO) estimation in the uplink of multiuser multiple- input multiple- output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Conventional maximum likelihood ... algorithm increases only linearly with the number of users. In this algorithm, the different CFOs from different users destroy the orthogonality among training sequences and introduce multiple access ... “Polarization Division Multiple Access With Polarization Modulation for LOS Wireless Communications” by Bin Cao, Qin-Yu Zhang, and Lin Jin discusses a potential multiple access and modulation...

Ngày tải lên: 21/06/2014, 17:20

... considering multipath fading. In the following sections, we extend the analysis in [7–9] to derive the capacity of a UWB PPM and PAM system over indoor fading channels for both single and multiple ... than one link is active in the multiple- access system, the optimal PPM receiver has a complex structure that takes advantage of all receiver knowledge regarding the characteristics of the multiple- access ... PAM UWB Multiple Access Communications over Indoor Fading Channels Hao Zhang 1 and T. Aaron Gulliver 2 1 Department of Electrical Engineering, Ocean University of China, 5 Yushan Road, Qingdao...

Ngày tải lên: 21/06/2014, 22:20

Ngày tải lên: 21/06/2014, 23:20

Ngày tải lên: 22/06/2014, 19:20

Ngày tải lên: 27/06/2014, 15:20

Ngày tải lên: 05/07/2014, 05:20

Ngày tải lên: 14/08/2014, 09:21

Ngày tải lên: 14/08/2014, 09:21

Ngày tải lên: 14/08/2014, 09:21

Ngày tải lên: 23/10/2014, 21:01

... same data access technologies as that of the nontransactional DAL. The following data access technologies were covered in Module 8, “The Nontransactional Data Access Layer : ! Microsoft Data ... 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 ... 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

... levels. It is interesting to see that using more training symbols does not improve the performance of the MLE as expected, because inserting training symbols will reduce the energy for the data symbols ... first inequality in (76) and t he second inequality in (77) are satisfied. From the condition f(θ)(θ − Φ) < 0, it is not hard to find that the second inequality in (76) and the first inequality in ... Furthermore, since the estimation quality of the first stage is available, we use BLUE to obtain ˆ θ for exploiting the quality information instead of using the MLE in the M-step as in the standard...

Ngày tải lên: 20/06/2014, 04:20

Ngày tải lên: 08/08/2014, 10:20

Ngày tải lên: 13/08/2014, 15:22