Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

HDLC - Sliding window full duplex point to point question

Posted on 2004-10-03
3
Medium Priority
?
532 Views
Last Modified: 2008-01-09
Hi, just have a fairly nuf nuf question im sure, but im hopeless @ this stuff! :)

A point to point full duplex comm link has been established bw stations A & B capable of using HDLC (ABM) protocol. The protocol (software) is configured so that each I-fram can carry 1000 data bytes. The line speed is such that each full I-fram is transmitted in 10ms, each U fram in 5ms and each S-fram in 3ms.

Following parameters "n" = 7 "m" = 8 and "p" = 0

Following events occur (in milliseconds)
a.    At T=0 HDLC driver in B initiates the establishment of a connection with A

b.    At time T = 10 + n the hDLC driver program in A is requested to transmit 4000 data bytes to B

c.    At time T = 20 +m the HDLC driver in B is requested to transmit 3000 data bytes to A

d.    At time T= 20+m+p an error occurs on the data link which corrupts several bits of the transmission from A to B

e.    Third I-fram from B also has an error corrupting one or more bits the first time the fram is sent

f.    50ms after the satisfactory completion of all data transfer, station A initiates the disconnection of the connection.

Need to produce a message - exchange diagram showing all frames being sent in each direction to achieve the successful transmission of the 7000 bytes of data.
- need to be made clear the time the transmission begins, & the time reception is completed
- frame type and contents of its control bye
- contents of the V(R) V(S) and value of the retransmission counter in each station resulting from the transmission or reception of the frame. (there is no need to repeat it for every clock tick of the frame.)

Assumptions
- propagation is zero
- processing time is negligible
- "ack timer" is set to 50 ms the ack timer begins at the time when the I frames start to be transmitted
- window soze is large enough to allow all I frames to be sent without waiting for ack
- ack, either piggy backed via an I frame or cia an RR frame, are sent as soon as possible after the acceptance of an incoming I frame.

cheers
0
Comment
Question by:ca_dyl
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 12212219
Please ask your teacher to explain any points that you don't understand.
0
 
LVL 3

Expert Comment

by:cagri
ID: 12212375
Excuse me but, what is the question ?
0
 
LVL 5

Accepted Solution

by:
XSINUX earned 2000 total points
ID: 12213674
Forgive my ignorance, but on this Link the Author Talks about some calculations that may help you


http://www.csse.monash.edu.au/~jwb/hdlc_demo.html

0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Short answer to this question: there is no effective WiFi manager in iOS devices as seen in Windows WiFi or Macbook OSx WiFi management, but this article will try and provide some amicable solutions to better suite your needs.
In this article, I am going to show you how to simulate a multi-site Lab environment on a single Hyper-V host. I use this method successfully in my own lab to simulate three fully routed global AD Sites on a Windows 10 Hyper-V host.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.
NetCrunch network monitor is a highly extensive platform for network monitoring and alert generation. In this video you'll see a live demo of NetCrunch with most notable features explained in a walk-through manner. You'll also get to know the philos…

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question