The MPLS WG Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] restoration time requirement (was Re: Last Call on RSVP Label Allocation for Backup Tunnels)
In message <31236E6272C7D2119F1C0000C0A8E4F40324083D@nj0200po04.bm.att.com>, "L azer, Monica A, NNAD" writes: > Voice switches will drop the connections after 2.5 seconds. A large number > of dropped calls will cause FCC reportable events, which is something that > US carriers need to avoid. So restoration within this time frame is needed > for support of trunks carrying voice traffic. > > Monica A. Lazer > Advanced Transport Technology and Architecture Planning > > 908 234 8462 > mlazer@att.com Monica, We're off topic, so I changed the subject. Thanks for providing the 2.5 second figure. I've heard carrier transport people grumble about SONET equipment they'd be please to get rid of that will shut down even when used as linear SONET with no protect path and as a result would require <100msec restoration. Since there is enough of this SONET gear, the carriers can't really get rid of it although it will probably disappear over time and so they will make fast restoration a requirement of people they buy from. To be safe, the request for <50msec has been made. If you are not blessed with such equipment or you are able to work around it when doing VoIP, then you are among the fortunate. Then again, this is second hand, so I could be completely wrong. This is not a measurement I've made myself and the SONET equipment is not something I'm familiar with such that I could say with confidence that it could not be configured to hold on longer or to not shut down at all if there was no protect. OTOH there are those who (claim to) want to configure SONET on some links but not on others and don't want a fast restoration. They want to be assured that restoration will occur only after it is safe to assume that SONET restoration is not available. Curtis
|
|