Communication Data
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Serial Communication Standards
Serial Communication Standards
All long-haul communications and most computer networks use serial connections, because the cost of cable and synchronization difficulties make parallel connections impractical. The most significant advantage is simpler wiring. Also, serial cables can be longer than parallel cables, because there is much less interaction (crosstalk) among the conductors in the cable. In this chapter, we will confine our consideration of serial communications to those connecting LANs to WANs.
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Serial Communication Standards
Serial Communication Standards
The figure is a simple representation of a serial communication. Data is encapsulated by the communications protocol used by the sending router. The encapsulated frame is sent on a physical medium to the WAN. There are various ways to traverse the WAN, but the receiving router uses the same communications protocol to de-encapsulate the frame when it arrives.
There are many different serial communication standards, each one using a different signaling method. There are three key serial communication standards affecting LAN-to-WAN connections:
RS-232 - Most serial ports on personal computers conform to the RS-232C or newer RS-422 and RS-423 standards. Both 9-pin and 25-pin connectors are used. A serial port is a general-purpose interface that can be used for almost any type of device, including modems, mice, and printers. Many network devices use RJ-45 connectors that also conform to the RS-232 standard. The figure shows an example of an RS-232 connector.
V.35 - Typically used for modem-to-multiplexer communication, this ITU standard for high-speed, synchronous data exchange combines the bandwidth of several telephone circuits. In the U.S., V.35 is the interface standard used by most routers and DSUs that connect to T1 carriers. V.35 cables are high-speed serial assemblies designed to support higher data rates and connectivity between DTEs and DCEs over digital lines. There is more on DTEs and DCEs later in this section.
HSSI - A High-Speed Serial Interface (HSSI) supports transmission rates up to 52 Mb/s. Engineers use HSSI to connect routers on LANs with WANs over high-speed lines such as T3 lines. Engineers also use HSSI to provide high-speed connectivity between LANs, using Token Ring or Ethernet. HSSI is a DTE/DCE interface developed by Cisco Systems and T3plus Networking to address the need for high-speed communication over WAN links.
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can i able to sell my ebook of data communication?
I took the content from internet and other books. So, can i able 2 sell that ebook or will their be a copyright problem. I did my ebook in flash software.
If the content you took was considered Public Domain knowledge then you can use it but legally not charge for it as it is Public Domain Information.
If someone else wrote the article and you have reproduced it, even in another format you have breached copyright law and as such cannot sell it, but may use it for your own purpose of knowledge.
If you wrote the articles you want to publish in an E-Book but have included excepts from other writers then you have to give accord to those contributors and technically have their permission to include their work in your publication.
I would be happy to review your material if you wish to have it vetted for legality mail it to admin@nettiser.com.au as an attachment and ensure you include a genuine email address for return of article with comments and advise to avoid legal issues
Lecture - 1 Introduction and Course Outline - Data Communication
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