Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Re: [EFM] RE: Pause frame usage in transport networks



Roy Bynum wrote:

> Regardless of the protocol that is used, all TDM transmission facilities
> induce a 125us latency variance at the customer data link layer.  This is
> because the transmission convergence mapping is based on a specific payload
> window that occurs every 125us  in SONET framing.

Roy,

I don't think this statement is quite correct as not the entire 125us frame needs
to be mapped/switched at once. Current generation SONET/SDH framing/switching
equipment have a latency variance that is an order of magnitude less than the
125us frame interval.

Regards, Siamack

begin:vcard 
n:Ayandeh;Siamack
tel;fax:781 271 9988
tel;work:781 276 4192
x-mozilla-html:FALSE
url:www.txc.com
org:Transwitch Corporation (Onex)
adr:;;34 Crosby Drive;Bedford;MA;01730;USA
version:2.1
email;internet:sayandeh@txc.com
title:Senior Consulting Engineer
end:vcard