On Sun, 12 Sep 2010, Kevin Keane wrote: > -----Original Message----- > From: asterisk-users-boun...@lists.digium.com > [mailto:asterisk-users-boun...@lists.digium.com] On Behalf Of Steve Edwards > Sent: Sunday, September 12, 2010 5:57 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [asterisk-users] Moving from DSL to T1 > > On Sun, 12 Sep 2010, Kevin Keane wrote: > >> What really matters is the latency, and T-1 is a huge improvement over >> DSL in that area. The easiest way to measure latency is the ping time >> to a server that is ?close to you? Internet-wise. A DSL has latencies >> of between 40ms (if it?s extremely good and not too many other people >> are using it) and 1000ms (if there is a problem somewhere). A good T-1 >> may have latencies as low as 5 ms or so. Also, with a T-1 the >> bandwidth is guaranteed and bidirectional. With a DSL line, you may >> get burstable bandwidth ? you don?t actually have that bandwidth, you >> just get to compete for excess bandwidth with your neighbors. > >> You are confusing DSL with cable. > > Both, actually. The latency numbers are actual numbers measured at a customer > site.
Ouch. My home/office ADSL connection (8Mb in/832Kb out) - ping to my external default route: $ ping -q -c10 188.39.1.26 PING 188.39.1.26 (188.39.1.26) 56(84) bytes of data. --- 188.39.1.26 ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 9008ms rtt min/avg/max/mdev = 12.913/13.266/13.747/0.286 ms Ping to one of my hosted servers: $ ping -q -c10 unicorn.drogon.net PING unicorn.drogon.net (195.10.225.68) 56(84) bytes of data. --- unicorn.drogon.net ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 9009ms rtt min/avg/max/mdev = 17.801/18.443/19.994/0.610 ms If 40ms is when it's extremely good, then I'm glad I don't live where you are! (However you're right about leased lines, E1 where I am is typically 2ms-3ms, but people here are moving to Ethernet based carriers now) Gordon -- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
