data link layer protocols in computer networks
Tài liệu Module 7- Data Link Layer CCNA Exploration 4.0 pptx
Ngày tải lên :
22/12/2013, 13:17
... 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...
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Chapter7 - DATA LINK CONTROL PROTOCOLS docx
Ngày tải lên :
30/03/2014, 07:20
... source access points (DSAP, SSAP)
2
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 ... protocol
The data link layer is fundamental to the
operation of all data communication
applications
27
Character-oriented Protocols –
Half-duplex Protocols
BSC
64
Bit-oriented Protocols –
Link ... Environments
The data link topology may be
Point-to-point circuit
Direct physical connection
Operates on an end-to-end basis
51
Bit-oriented Protocols –
HDLC (High-level Data Link Control)
Protocol...
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Báo cáo hóa học: "Research Article Cross-Layer Explicit Link Status Notification to Improve TCP Performance in Wireless Networks" potx
Ngày tải lên :
21/06/2014, 20:20
... packet in downlink communication with a stop-
and-wait LL-ARQ. When the wireless link layer of BS fails in
the first transmission attempt of the packet 1 (Layer- 2 ACK
timeout), the wireless link layer ... wireless link. In LL-ELSN, there is no
additional transmission over the wireless link and thus it has
no detection failure in uplink communication. LL-ELSN also
has no detection failure in downlink ... RTT
min
updating algorithm,
in which RTT
min
is multiplied by a reducing factor less
than one. However, since the RTT
min
updating algorithm
is invoked whenever a congestion event occurs, RTT
min
goes...
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Tài liệu Báo cáo khoa học: Computational processing and error reduction strategies for standardized quantitative data in biological networks doc
Ngày tải lên :
19/02/2014, 07:20
... quantitative data
and permit the cost-effective assembly of large, high-
quality data sets.
Discussion
Quantitative data generation is becoming increasingly
important for obtaining insight into the ... protein standard depicted in Fig. 1. Smoothing spline curves through original
and normalized data are shown as solid lines.
M. Schilling et al. Strategies for standardizing quantitative data
FEBS ... bio-
chemical data.
We use the erythropoietin receptor (EpoR)-induced
activation of ERK1 in the hematopoietic suspension
cell line, BaF3-hemaglutinin-tagged (HA)-EpoR, and
the interleukin-6 (IL-6)-induced...
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qos in packet networks the springer international series in engineering and computer science
Ngày tải lên :
01/06/2014, 12:38
... integration, is
undefined. If the integration interval a ~ b includes the integration of
over this interval is
1
; if lies outside of the integration interval, the
integration of over the interval is ... question underpinning this book in perspective.
Referring to Figure 1.1, in the beginning of telecommunications, there
were in general two separate networks, one for voice and one for data. Each
network ... consisting of two random experiments, “throwing a die”
and “throwing a coin.” A player is to throw the die twice and the coin once.
A player who gets the face with one spot in both die-throwings...
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Báo cáo hóa học: " Delay-throughput analysis of multi-channel MAC protocols in ad hoc networks" ppt
Ngày tải lên :
20/06/2014, 22:20
... hopping pattern or have
individual hopping patterns. In multi-channel WLANs
the common hopping approach is used for example in
Channel-Hopping Multiple Access (CHMA) which was
introduced in [11]. ... Multi-channel Mac for Ad Hoc Networks: Handling Multi-
channel Hidden Terminals Using a Single Transceiver, in 5th ACM
International Symposium on Mobile Ad Hoc Networking and Computing,
MobiHoc ‘04, 222–233 ... 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...
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Báo cáo hóa học: " Research Article A Cross-Layer Approach in Sensing and Resource Allocation for Multimedia Transmission over Cognitive UWB Networks" docx
Ngày tải lên :
21/06/2014, 11:20
... considering the findings in the preliminary investigation,
SNR is considered as the main QoS metric at the PHY layer
to determine the appropriate sensing time for cognitive users
in our cross layer ... l-centric
adaptation
PHY layer
Layer without
decision freedom
Determining
transmission actions
(c)
Application
layer
Layer l
PHY layer
Middleware
(d)
Application
adaptation
Layer l
adaptation
PHY layer
adaptation
(e)
Figure ... Yusof,
“Sensing period considerations in fading environment for
multimedia delivery in cognitive Ultra Wideband system,” in
Proceedings of IEEE International Conference on Signal and
Image Processing...
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Báo cáo hóa học: "Research Article A Decentralized Approach for Nonlinear Prediction of Time Series Data in Sensor Networks" pptx
Ngày tải lên :
21/06/2014, 17:20
... the training set, making them unsuitable
for online applications. Therefore, it was essential to first
propose a mechanism for controlling the increase in the
model order as new input data become ... promising
subject for research.
References
[1] M. Rabbat and R. Nowak, “Distributed optimization in sensor
networks, ” in Proceedings of the 3rd International Symposium
on Information Processing in ... dynamic fields.
Online optimization of this criterion by adding or removing
kernel functions from the dictionary also seems interesting.
Finally, in a broader perspective, controlling the movement
of...
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Báo cáo hóa học: " Editorial Cross-Layer Design for the Physical, MAC, and Link Layer in Wireless Systems" doc
Ngày tải lên :
21/06/2014, 22:20
... allows
certain important information to in uence decisions in a
layer that is originally not defined to use that information
(e.g., the SNR information at the link layer or the queue size
at the baseband ... impact
on these layers and their interaction. In recent years, the
importance of the cross -layer design at the PHY/MAC /link
layer has been reiterated through the emergence of many
innovative techniques, ... observation
that a cross -layer approach is particularly important when
designing protocols at the physical (PHY) and medium
access control (MAC) /link layer. This is because the defining
wireless features...
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Báo cáo hóa học: "Review Article Multicast Routing Protocols in Mobile Ad Hoc Networks: A Comparative Survey and Taxonomy Osamah S. Badarneh and Michel Kadoch" pdf
Ngày tải lên :
21/06/2014, 22:20
... session
termination
Sends leave
message
JoinAck
JoinReq
JoinReq
JoinAck
Join Reply
Join Request
Receiver
Node
Y
Join Reply
Join Request
Downstream node detects
a link failure sends
JoinReq
JoinAck
Join ... Communications and Networking 33
Virtual link
Physical link
Figure 32: Physical link versus virtual link.
Overlay link
Physical link Destination node
Non-member node
Source core
S
X
Y
Z
Downstream ... for initializing, constructing,
maintaining, and terminating a multicast session.
When a source node has data to send, but no information
on a route to a receiver is known, it floods a Join Request
packet,...
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Báo cáo hóa học: "Research Article An Energy-Efficient Link Layer Protocol for Reliable Transmission over Wireless Networks" pdf
Ngày tải lên :
21/06/2014, 22:20
... energy-
efficient link layer protocol for reliable transmission over
wireless sensor networks, ” in Proceedings of the IEEE Interna-
tional Conference on Communications (ICC ’08), pp. 146–150,
Beijing, China, ... number of data and header bits in the
MAC data frame; for example, in 802.15.4, n
hdr
= 104 bits
are used in the short addressing mode [18] and the minimum
header size is 34 bytes in 802.11 networks. ... modeling the
reliability of data transport in wireless sensor networks, ” in
Proceedings of the15th EUROMICRO International Confer-
ence on Parallel, Distributed and Network-Based Processing
(PDP...
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Hình ảnh Protocols in relation to the OSI model.doc
Ngày tải lên :
24/08/2012, 21:11
... 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....
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