Design of HDLC (High Level Data Link Controller)
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
pradeepa arumugam
Active In SP

Posts: 4
Joined: Mar 2010
03-03-2010, 08:53 PM

need abstract and more information about this project and implimentation" Design of HDLC (High Level Data Link Controller) core for data link layer " plz forward me
project report helper
Active In SP

Posts: 2,270
Joined: Sep 2010
20-10-2010, 01:06 PM

.doc   HDLC.doc (Size: 77 KB / Downloads: 74)
High-Level Data Link Control (HDLC)

High-Level Data Link Control (HDLC) is a bit-oriented synchronous data link layer protocol developed by the International Organization for Standardization (ISO). The original ISO standards for HDLC are:
• ISO 3309 — Frame Structure
• ISO 4335 — Elements of Procedure
• ISO 6159 — Unbalanced Classes of Procedure
• ISO 6256 — Balanced Classes of Procedure
The current standard for HDLC is ISO 13239, which replaces all of those standards.
HDLC provides both connection-oriented and connectionless service.
HDLC can be used for point to multipoint connections, but is now used almost exclusively to connect one device to another, using what is known as Asynchronous Balanced Mode (ABM). The original master-slave modes Normal Response Mode (NRM) and Asynchronous Response Mode (ARM) are rarely used.
HDLC frames can be transmitted over synchronous or asynchronous links. Those links have no mechanism to mark the beginning or end of a frame, so the beginning and end of each frame has to be identified. This is done by using a frame delimiter, or flag, which is a unique sequence of bits that is guaranteed not to be seen inside a frame. This sequence is '01111110', or, in hexadecimal notation, 0x7E. Each frame begins and ends with a frame delimiter. A frame delimiter at the end of a frame may also mark the start of the next frame. A sequence of 7 or more consecutive 1-bits within a frame will cause the frame to be aborted.
When no frames are being transmitted on a simplex or full-duplex synchronous link, a frame delimiter is continuously transmitted on the link. Using the standard NRZ encoding from bits to line levels (0 bit = transition, 1 bit = no transition), this generates one of two continuous waveforms, depending on the initial state:
This is used by modems to train and synchronize their clocks via phase-locked loops. Some protocols allow the 0-bit at the end of a frame delimiter to be shared with the start of the next frame delimiter, i.e. '011111101111110'.
For half-duplex or multi-drop communication, where several transmitters share a line, a receiver on the line will see continuous idling 1-bits in the inter-frame period when no transmitter is active.

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Tagged Pages: filetype dochdlc, design of hdlc high level data link controller, hdlc address, hdlc frame sequence diagram, iso13239 pdf, 13239, async hdlc nak 0x7e,
Popular Searches: hdlc bad fcs, hdlc and sdlc ppt, hdlc design, ppp vs hdlc, high level design of banking system, iso 78164, async hdlc frame format,

Quick Reply
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Privacy-Preserving Public Auditing for Data Storage Security in Cloud Computing PPT project girl 1 987 21-10-2015, 01:52 PM
Last Post: Guest
  email flyer design full report project report tiger 9 27,887 26-02-2015, 03:06 PM
Last Post: oiajecuot
  Data Hiding in Video using Least Bit Technique seminar tips 1 560 18-10-2014, 05:40 AM
Last Post: wayan sukadana
  data mining full report project report tiger 35 199,146 03-10-2014, 04:30 AM
Last Post: kwfEXGu
  A Novel Data Embedding Method Using Adaptive Pixel Pair Matching Report project girl 4 1,842 18-09-2014, 03:49 PM
Last Post: Radhika.m
  Cooperative Provable Data Possession for Integrity Verification in Multi-Cloud Storag seminar flower 3 3,159 23-05-2014, 10:04 AM
Last Post: seminar project topic
  Credibility Ranking of Tweets during High Impact Events Report project girl 3 1,043 24-03-2014, 04:23 PM
Last Post: seminar project topic
  Image Data Acquisition and compression using K-RLE Algorithm on Embedded ARM ppt seminar projects maker 0 584 28-09-2013, 04:36 PM
Last Post: seminar projects maker
  The Use of Interval-Related Expert Knowledge in Processing 2-D and 3-D Data seminar projects maker 0 320 26-09-2013, 02:13 PM
Last Post: seminar projects maker
  Night image Optimization Technique using hybrid Model of high intensity pdf seminar projects maker 0 503 21-09-2013, 04:05 PM
Last Post: seminar projects maker