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X.25 and X.28 INET WAN

Posted on 1998-12-02
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Hi!

My question is something related to WAN with X.25 at Server end and X.28 dialup connection at remote node end. Please give me the details of following questions assuming that X.25 INET 64 KBPS installation at Server end and X.28 9.6 KBPS dialup connection at remote node end :
1. Concept of the entire system. (Please answer in details with all technical aspects preferrably with pictorial diagram. Or refer some book or website from where I can get the required information.)
2. Detailed Data security mechanism.
3. Considering Pt.1 & 2 how far INET is reliable ?

Please also note is there any other solution of the above with the more or less same one time and recurring cost.
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Question by:majorjohn
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istal112898 earned 40 total points
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go to WWW.SCSITE.COM or WWWW.COURSE.COM they have there different networking book you can see, and then buy it in WWW.AMAZON.COM
X.25 goes as high as 2 MBITS currently but it has not been deployed. the protocol was updated in 1991 or 1992 it used to be 64 kb, but it goes higher now. It is not widely used in USA because it is not reliable(it uses Telephone lines which suddenly can be disconnected). It is better to get a Leased line dedicated to the service. 64 kb is used in Switch line and it is not good for WAN used because it is relatively slow. X.25 uses PADs (packet assembler and dissambler)
the X.25 protocol uses error checking which is good. not all WAN uses. The speed limitation is the problem with it. This technology is being replaced by Frame Relay and also ATM (uses Sonet and speed as high as 622 MBITS). so X.25 uses a SVC ( switched virtual circuit)
for the data security you will to use a VPN( virtual private network) which can encript the data and can avoid people to Monitor it. This is what it should be used through a Public network such as the Telephone company and the Internet.

now, the solution to it will be to use Frame relay , which is a combination of X.25 and ISDN. it uses PVC ( permanent Virtual circuit). however, it does not uses ERROR Check (CRC) the trhough put is faster. this Frame relay uses Fiber optic connections. The error checking is left to the devices at the end of each place. so it is not implemented in the cable. This type is used for transfering data all the time. it can use speed from 56 kb up to 1.544 Mbps. to do that you need to digital devices called CSU/DSU just like T1.with a router or a bridge at each end to direct traffic on and of the WAN link.
Now the good thing is that you can purchase framerelay services in 64 Kbps CIR (commited Information Rate). so you do not spend more money.
So called the Telephone company and ask them about Frame Relay service if it is support in your AREA.
Go to Barnes and Noble and Buy a book called a Guide to Networking Essential. That book is a FAT one. very recommended.

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