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Search took 0.01 seconds; generated 66 minute(s) ago. Search: Posts Made By: bonfire
Forum: Data Communication 18-03-2011, 06:36 PM
Replies: 0
Views: 1,694
Posted By bonfire
Network Layer: Internet Protocol

Network Layer: Internet Protocol



* The Address Resolution Protocol (ARP) is a dynamic mapping method that finds a physical address, given an IP address.
* An ARP request is broadcast...
Forum: Data Communication 18-03-2011, 06:35 PM
Replies: 0
Views: 1,969
Posted By bonfire
Network Layer: Logical Addressing

Network Layer: Logical Addressing


* There are two popular approaches to packet switching: the datagram approach and the virtual circuit approach.
* In the datagram approach, each...
Forum: Data Communication 18-03-2011, 06:34 PM
Replies: 0
Views: 1,778
Posted By bonfire
Virtual-Circuit Networks: Frame Relay and ATM

Virtual-Circuit Networks: Frame Relay and ATM


* Virtual circuit switching is a data link technology in which links are shared.
* A virtual circuit identifer (VCI) identifies a frame...
Forum: Data Communication 18-03-2011, 06:34 PM
Replies: 0
Views: 1,375
Posted By bonfire
Sonet/sdh

SONET/SDH



* Cellular telephony provides communication between two devices. One or both may be mobile.
* A cellular service area is divided into cells.
* Advanced Mobile Phone...
Forum: Data Communication 18-03-2011, 06:33 PM
Replies: 0
Views: 1,694
Posted By bonfire
Wireless WANs: Cellular Telephone and Satellite Networks

Wireless WANs: Cellular Telephone and Satellite Networks


* A repeater is a connecting device that operates in the physical layer of the Internet model. A repeater regenerates a signal,...
Forum: Data Communication 18-03-2011, 06:32 PM
Replies: 0
Views: 1,582
Posted By bonfire
Connecting LANs, Backbone Networks, and Virtual LANs

Connecting LANs, Backbone Networks, and Virtual LANs


* The IEEE 802.11 standard for wireless LANs defines two services: basic service set (BSS) and extended service set (ESS). An ESS...
Forum: Data Communication 18-03-2011, 06:32 PM
Replies: 0
Views: 1,598
Posted By bonfire
Wireless LANs

Wireless LANs


* Ethernet is the most widely used local area network protocol.
* The IEEE 802.3 standard defines 1-persistent CSMA/CD as the access method for first-generation 10-Mbps...
Forum: Data Communication 18-03-2011, 06:31 PM
Replies: 0
Views: 1,433
Posted By bonfire
Wired LANs: Ethernet

Wired LANs: Ethernet


* Medium access methods can be categorized as random, controlled, or channelized.
* In the carrier sense multiple-access (CSMA) method, a station must listen to...
Forum: Data Communication 18-03-2011, 06:31 PM
Replies: 0
Views: 1,357
Posted By bonfire
Multiple Access

Multiple Access



* The Point-to-Point Protocol (PPP) was designed to provide a dedicated line for users who need Internet access via a telephone line or a cable TV connection.
* A PPP...
Forum: Data Communication 18-03-2011, 06:30 PM
Replies: 0
Views: 1,494
Posted By bonfire
Data Link Control

Data Link Control


* Flow control is the regulation of the sender’s data rate so that the receiver buffer does not become overwhelmed.
* Error control is both error detection and error...
Forum: Data Communication 18-03-2011, 06:29 PM
Replies: 0
Views: 1,536
Posted By bonfire
Error Detection and Correction

Error Detection and Correction


* Errors can be categorized as a single-bit error or a burst error. A single-bit error has one bit error per data unit. A burst error has two or more bit...
Forum: Data Communication 18-03-2011, 06:29 PM
Replies: 0
Views: 1,603
Posted By bonfire
Using Telephone and Cable Networks for Data Transmission

Using Telephone and Cable Networks for Data Transmission


* A home computer can access the Internet through the existing telephone system or through a cable TV system.
* DSL supports...
Forum: Data Communication 18-03-2011, 06:28 PM
Replies: 0
Views: 1,420
Posted By bonfire
Switching

Switching


* Switching is a method in which communication devices are connected to one another efficiently.
* A switch is intermediary hardware or software that links devices together...
Forum: Data Communication 18-03-2011, 06:27 PM
Replies: 0
Views: 1,599
Posted By bonfire
Transmission Media

Transmission Media

* Transmission media lie below the physical layer.
* A guided medium provides a physical conduit from one device to another.
* Twisted-pair cable, coaxial cable, and...
Forum: Data Communication 18-03-2011, 06:26 PM
Replies: 0
Views: 1,712
Posted By bonfire
Bandwidth Utilization: Multiplexing and Spreading

Bandwidth Utilization: Multiplexing and Spreading


* Multiplexing is the simultaneous transmission of multiple signals across a single data link.
* Frequency-division multiplexing (FDM)...
Forum: Data Communication 18-03-2011, 06:26 PM
Replies: 0
Views: 1,464
Posted By bonfire
Analog Transmission

Analog Transmission


* Digital-to-analog modulation can be accomplished using the following:
*Amplitude shift keying (ASK)—the amplitude of the carrier signal varies.
...
Forum: Data Communication 18-03-2011, 06:24 PM
Replies: 0
Views: 1,404
Posted By bonfire
Digital Transmission

Digital Transmission


* Line coding is the process of converting binary data to a digital signal.
* The number of different values allowed in a signal is the signal level. The number of...
Forum: Data Communication 18-03-2011, 06:23 PM
Replies: 0
Views: 1,431
Posted By bonfire
Data and Signals

Data and Signals


* Data must be transformed into electromagnetic signals prior to transmission across a network.
* Data and signals can be either analog or digital.
* A signal is...
Forum: Data Communication 18-03-2011, 06:22 PM
Replies: 0
Views: 1,495
Posted By bonfire
Network Models

Network Models

* The five-layer model provides guidelines for the development of universally compatible networking protocols.

* The physical, data link, and network layers are the...
Forum: Digital Telephony 18-03-2011, 05:41 PM
Replies: 0
Views: 2,658
Posted By bonfire
Transporting VoIP Traffic with UDP and RTP

Transporting VoIP Traffic with UDP and RTP

In the H.323 article you learned that Voip communications uses a combination of both TCP and UDP at the transport layer. TCP is the transport protocol...
Forum: Digital Telephony 18-03-2011, 05:40 PM
Replies: 0
Views: 2,198
Posted By bonfire
The Importance of Network Quality When Transporting VoIP Traffic

The Importance of Network Quality When Transporting VoIP Traffic


In order to support time-sensitive applications like Voip, a network should currently be running at a high performance level,...
Forum: Digital Telephony 18-03-2011, 05:38 PM
Replies: 0
Views: 1,550
Posted By bonfire
VoIP, Network Congestion, and the Importance of QoS Techniques

VoIP, Network Congestion, and the Importance of QoS Techniques

Network congestion is an issue that can lead to a variety of problems on any data network; when the data network is also supporting ...
Forum: Digital Telephony 18-03-2011, 05:36 PM
Replies: 0
Views: 1,715
Posted By bonfire
QoS Mechanisms for Improving VoIP Quality ...

QoS Mechanisms for Improving VoIP Quality


Implementing QoS mechanisms is another key consideration in order to ensure that Voip traffic is forwarded across a network in a timely manner. A...
Forum: Digital Telephony 18-03-2011, 05:33 PM
Replies: 0
Views: 1,579
Posted By bonfire
The Impact of Delay and Jitter on VoIP Networks

The Impact of Delay and Jitter on VoIP Networks

While a traditional circuit-switched voice call has a dedicated circuit and bandwidth allocated to it, packet-switched voice calls are subject to...
Forum: Digital Telephony 18-03-2011, 05:32 PM
Replies: 0
Views: 1,511
Posted By bonfire
Predictable Delays Associated with VoIP Traffic

Predictable Delays Associated with VoIP Traffic


The bullet points below each type of constant or “predictable” delay encountered with Voip traffic, and how these issues can be compensated for...
Showing results 251 to 275 of 610
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