I just read they were building a new transatlantic cable that will shave 10uS from the normal 60 or so uS and that for large traders, 1uS represents 100 million $ per year saving/increased revenue.
Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: x...@darksmile.net Sender: time-nuts-boun...@febo.com Date: Fri, 16 Sep 2011 13:05:40 To: Discussion of precise time and frequency measurement<time-nuts@febo.com>; Hal Murray<hmur...@megapathdsl.net> Reply-To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Google NTP Servers and smearing leap seconds... You are right. To be more precise, I should have said that the time sync should be at least 1 order of magnitude less. In the case of <10us turnaround time, it is assumed that the timesync is <1us. This is the reason that everyone uses multiple stratum 1 NTP servers using GPS in their datacenters. So the Forex transaction goes like this: 1. (Both parties) Are we in proper sync timewise? 2. (Party 1) I need transaction type x. My timestamp is: xxxx.xxxx. Go. 3. (PArty 2) Confirmed. My timestamp is: yyyy.yyyy. Go. These timestamps are legal entities and bind both parties to the transaction. That's why transactions have a data transfer entity in the middle (Reuters, Bloomberg) which guarantees proper timesync for all involved. With Reuters in the middle, only the Reuters timestamp (arrival time and send time) can be trusted. However, Many times you will see a Reuters machine lose sync and the UNIX SA's will restart NTP on it. Reuters puts more than one machine per site for redundancy. Quoting Hal Murray <hmur...@megapathdsl.net>: > > x...@darksmile.net said: >> You can forget Wall St. firms and Banks for starters. > >> They need sub-microsecond accurate timing as some instruments (Forex) are >> moving to <10 microsecond latency from order entry to order ack. > > 10 microsecond latency doesn't say anything about how accurate the time has > to be. > > Does anybody have a good URL on the accuracy requirements of banks and/or > stock markets? I expect there are both legal and technical issues. I'd like > to understand them separately but I won't be surprised if they are thoroughly > tangled. > > -- > These are my opinions, not necessarily my employer's. I hate spam. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.