We have 1 DS-3, that if we get close to 45Mbps IN/OUT the other direction will be completely unusable. We have another DS3, that we have seen doing 45Mbps IN, and 15Mbps Out at the same time. This is going to sound dumb, but is duplex a consideration with lines of these types? I thought you could do either 45Mbps in, 45Mbps out, or a mix of both, not 45Mbps In, and 45Mbps out at the same time (90mbps).. I couldn't find this exact info on the net anywhere. -Drew
the directions are independent. are you sure when you run the line at 100% in one direction you're not either a) returning the ping/traffic down the congested DS3 or b) disrupting control traffic - ospf, keepalives etc that is upsetting the link Steve On Tue, 6 Jul 2004, Drew Weaver wrote:
We have 1 DS-3, that if we get close to 45Mbps IN/OUT the other direction will be completely unusable. We have another DS3, that we have seen doing 45Mbps IN, and 15Mbps Out at the same time. This is going to sound dumb, but is duplex a consideration with lines of these types? I thought you could do either 45Mbps in, 45Mbps out, or a mix of both, not 45Mbps In, and 45Mbps out at the same time (90mbps)..
I couldn't find this exact info on the net anywhere.
-Drew
SJW> Date: Tue, 6 Jul 2004 16:25:28 +0100 (BST) SJW> From: Stephen J. Wilcox SJW> On Tue, 6 Jul 2004, Drew Weaver wrote: SJW> SJW> DW> We have 1 DS-3, that if we get close to 45Mbps IN/OUT SJW> DW> the other direction will be completely unusable. Calculated on what time interval? If that's a five-minute average, you probably have some serious backpressure spikes that you're missing. (Are you running xRED to get traffic to back off?) SJW> are you sure when you run the line at 100% in one direction SJW> you're not either a) returning the ping/traffic down the SJW> congested DS3 or b) disrupting control traffic - ospf, SJW> keepalives etc that is upsetting the link How about less exotic things... like ACKs? :-) Or perhaps DNS resolution is slow. I don't know exactly what the problem is, as a "my Internet isn't working" post is rather vague. :-( At any rate, this thread probably fits better on isp-bandwidth, perhaps isp-tech... maybe even i-a. Posting to list just in case there are lurkers who didn't know, but the other lists are more fitting for questions like this. Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked.
DW> Date: Tue, 6 Jul 2004 11:42:32 -0400 DW> From: Drew Weaver DW> I thought you could do either 45Mbps in, 45Mbps out, or a mix DW> of both, not 45Mbps In, and 45Mbps out at the same time DW> (90mbps).. No no no. DSx circuits are full duplex. Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked.
RB> Date: Tue, 6 Jul 2004 15:59:10 -0700 RB> From: Randy Bush RB> EBD> No no no. DSx circuits are full duplex. RB> ^ usually True. I meant to state that TX traffic doesn't come at the expense of RX traffic, and that a talker needn't wait to ensure the other end is listening. Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked.
when you measure utilization X by five minute samples, it is highly likely that it bursts at least 30% above that, or at least tries to. randy
Drew Weaver <drew.weaver@thenap.com> wrote: [...]
We have 1 DS-3, that if we get close to 45Mbps IN/OUT the other direction will be completely unusable. We have another DS3, that we have seen doing 45Mbps IN, and 15Mbps Out at the same time. This is going to sound dumb, but is duplex a consideration with lines of these types? I thought you could do either 45Mbps in, 45Mbps out, or a mix of both, not 45Mbps In, and 45Mbps out at the same time (90mbps)..
The underlying link should be doing both 45Mb/s in and 45Mb/s out at the same time. However, with TCP/IP, if the downstream (say) link is so saturated with downloads that the acknowledgements to uploads are heavily delayed or lost, this can cause uploads to be throttled. The extent to which this occurs depends on all sorts of factors, such as the TCP stacks on the hosts at either end, the routers on the link, and whatnot. -- Another tradition is to soak the pudding in brandy and then set fire to it. One year we couldn't find any brandy so we used whisky. This produced a flame which scorched the ceiling above the table. -- Edward Pierce in the Monastery
PC> Date: Tue, 6 Jul 2004 17:43:24 +0000 (UTC) PC> From: Peter Corlett PC> The underlying link should be doing both 45Mb/s in and 45Mb/s PC> out at the same time. Errr? Most providers can only dream of 1:1 ratios. Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked.
On Tue, 6 Jul 2004, Edward B. Dreger wrote:
PC> Date: Tue, 6 Jul 2004 17:43:24 +0000 (UTC) PC> From: Peter Corlett
PC> The underlying link should be doing both 45Mb/s in and 45Mb/s PC> out at the same time.
Errr? Most providers can only dream of 1:1 ratios.
I interpret this as the SDH will run as 45Mb in both directions.. you're talking about peering? Steve
Eddy -- EverQuick Internet - http://www.everquick.net/ A division of Brotsman & Dreger, Inc. - http://www.brotsman.com/ Bandwidth, consulting, e-commerce, hosting, and network building Phone: +1 785 865 5885 Lawrence and [inter]national Phone: +1 316 794 8922 Wichita _________________________________________________________________ DO NOT send mail to the following addresses: davidc@brics.com -*- jfconmaapaq@intc.net -*- sam@everquick.net Sending mail to spambait addresses is a great way to get blocked.
Edward B. Dreger <eddy+public+spam@noc.everquick.net> wrote:
From: Peter Corlett
The underlying link should be doing both 45Mb/s in and 45Mb/s out at the same time. Errr? Most providers can only dream of 1:1 ratios.
I meant the underlying circuit itself. Much like my telephone line does 64k each way in both directions, but it doesn't mean I'm chatting away on it constantly ;) -- PGP key ID E85DC776 - finger abuse@mooli.org.uk for full key
On Tue, 6 Jul 2004, Drew Weaver wrote: : We have 1 DS-3, that if we get close to 45Mbps IN/OUT the other : direction will be completely unusable. We have another DS3, that we have : seen doing 45Mbps IN, and 15Mbps Out at the same time. This is going to : sound dumb, but is duplex a consideration with lines of these types? I : thought you could do either 45Mbps in, 45Mbps out, or a mix of both, not : 45Mbps In, and 45Mbps out at the same time (90mbps).. : : I couldn't find this exact info on the net anywhere. Anyone happen to know of where TTC's online library went a few years ago after they merged with someone? (I've forgotten whom) There was a great deal on T1s, T3s, etc. I have hard copies at home, but it'd sure be nice to get some online copies, if they still exist. scott
participants (6)
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abuse＠cabal.org.uk -
Drew Weaver -
Edward B. Dreger -
Randy Bush -
Scott Weeks -
Stephen J. Wilcox