INTELLIGENT WORK FORUMS
FOR COMPUTER PROFESSIONALS

Member Login




Remember Me
Forgot Password?
Join Us!

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

Join Tek-Tips
*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.
Jobs from Indeed

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

D4, ESF, AMI, B8ZS

D4, ESF, AMI, B8ZS

(OP)
Is there anyone that can explain D4, ESF, AMI & B8ZS to me as if I were an 8 year old.  Or point me to a document that could do the same.

Thanks

Kim

RE: D4, ESF, AMI, B8ZS

Hi kimzymes,

In the T1 transmission system these terms describe protocols and parameters: D4/SF  & ESF = are the framing formats of the digital signal. D4 and SF are the same thing, stands for Superframe. ESF stands for Extended Superframe. AMI and B8ZS are line code parameters. AMI stands for Alternate Mark Inversion, in relation to framing only allows 56kb channel bandwidth. B8ZS stans for Bipolar Eight Zero Substitution, in relation to framing allows 64kb clear channel bandwidth.

There are many sources that provide reference and tutorial info on the T1 transmission system, one that comes to mind is BellCore/Telcordia. You might do a "Google" and find some good information. Also companies like Tellabs or Telecommunications Techniques Corp(TTC) in the past had some tutorial stuff.

Hope this helps!

....JIM....

RE: D4, ESF, AMI, B8ZS

Hi jerryreeve,

Those two links are very good! I downloaded them to refresh my brain every now and then. The RBOCs used to make available some "Tech Pubs" covering the same thing years ago. But I don't know if they are still available. Even though they might be too technical for some, those are the facts of T1!

Just an aside, Quabbin Cable (quabbin.com) has some excellent info on cable for T1 applications and how to do it RIGHT!

....JIM....

RE: D4, ESF, AMI, B8ZS

Yes, even if looking at the date of last update makes you wonder what is new about t-1 circuits, it is still the basis of how we send data.

If voting could really change things, it would be illegal.

JerryReeve
Communications Systems Int'l
com-sys.com

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close