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RE: Quick circuit question.
by Hannigan, Martin 06 Jul '04

06 Jul '04

Just to be accurate, DS is digital service cross connect i.e. dsx1 panel, dsx3 panel, etc. Typically a ds0 cross connect is referred to as "ds0 wire frame" since it's muxed up to ds1's via DSX1 bays. A DSX panel is basically a piece of dumb equipment, sometimes fitted with led port tracers(useful)that you can configure in interconnect, one card, or cross connect, two card, modes for testing both sides, good add move, drop capability, etc. -M -- Martin Hannigan (c) 617-388-2663 VeriSign, Inc. (w) 703-948-7018 Network Engineer IV Operations & Infrastructure hannigan(a)verisign.com > -----Original Message----- > From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of > Edward B. Dreger > Sent: Tuesday, July 06, 2004 6:55 PM > To: ''nanog(a)merit.edu'' > Subject: RE: Quick circuit question. > > > > > Date: Tue, 6 Jul 2004 14:45:44 -0500 > > From: frank@dti... > > > Finally, "dsx" does not stand for full duplex, as someone > > DSx = DS0/DS1/DS3 (using "x" as wildcard). Not to be confused > with uppercase "X". > > > 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(a)brics.com -*- jfconmaapaq(a)intc.net -*- sam(a)everquick.net > Sending mail to spambait addresses is a great way to get blocked. >

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Quick circuit question.
by Drew Weaver 06 Jul '04

06 Jul '04

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

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RE: Quick circuit question.
by frank＠dticonsulting.com 06 Jul '04

06 Jul '04

Two observations concerning the quick circuit question. First, yes, T3s are definitely full duplex in nature. The only time anything common is used is when the same strand of fiber is used in a WDM mode, with one lambda supporting the east-west direction, while another lambda supports the west- east direction. But even here, there is no interaction taking place between the two paths. Secondly, if the line is suspected as being the cause of a problem, tests should be performed in the absence of end user data, simply to eliminate the line or tag it as the problem. Testing should take place using bit-error test sets that employ quasi-random and other forms of continuous data streams, instead. In this manner no questions can arise as to ack-nacks or circumstances surrounding download- upload conflicts and windowing considerations. Finally, "dsx" does not stand for full duplex, as someone mentioned. "FDX" stands for full duplex. DSX-n is an abbreviation that stands for Digital Cross-Connect at the n level, which should not to be confused with the electronic time-slot- interchange kinds of disgital cross-connects, known also as DACSes, but rather the physical patch panel type of cross-connects we're all familiar with. A DSX-1 is a twisted pair demarcation point for a DS-1 or T1 line. A DSX-3 is a digital cross-connect for a DS-3 or T3. Etc. Frank On Tue, 6 Jul 2004 13:21 , 'Williams, Jeff' <jwilliams3(a)tiaa-cref.org> sent: > >You might find what you're looking for at >acterna.com/global/technical_resources/index_gbl.html > >They're the result of the TTC/ WWG merger. > >Jeff > >-----Original Message----- >From: owner-nanog(a)merit.edu [owner-nanog(a)merit.edu','','','')">owner- nanog(a)merit.edu] On Behalf Of >Scott Weeks >Sent: Tuesday, July 06, 2004 1:13 PM >To: nanog(a)merit.edu >Subject: Re: Quick circuit question. > > > > > >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 > > >This message, including any attachments, contains confidential information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, please contact sender immediately by reply e-mail and destroy all copies. You are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. >TIAA-CREF >

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RE: mid-mount server rails
by Hannigan, Martin 06 Jul '04

06 Jul '04

That depends on aisle spacing. A four post box has some dimension. Depending upon the aisle spacing, it could obstruct an aisle or obstruct access to other equipment. Midmounting works great in properly sized aisles with defined "working sides" etc. I hate it when I catch something on a box that should be in a cabinet but for some reason it was midmounted when it shouldn't have been. It is kind of dangerous, especially if it's eye level. -M -- Martin Hannigan (c) 617-388-2663 VeriSign, Inc. (w) 703-948-7018 Network Engineer IV Operations & Infrastructure hannigan(a)verisign.com > -----Original Message----- > From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of > Aaron Thomas > Sent: Tuesday, July 06, 2004 4:32 PM > To: 'Christopher J. Wolff' > Cc: nanog(a)merit.edu > Subject: RE: mid-mount server rails > > > > Depending on the number of servers, I would just go with a > center mount shelf. More flexible and functionality should you remove > the server... > > Grab some rubber feet (they come with most rack mount network > equipment but are rarely used) on the server and you should be ok... > If you want, you could over strap the server for better security. > > This has worked well for me. > > Cheers, > > Aaron > > -----Original Message----- > From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu] On > Behalf Of Christopher J. Wolff > Sent: July 5, 2004 8:07 PM > To: nanog(a)merit.edu > Subject: mid-mount server rails > > > Hi Nanogers > > If I have a two post relay rack, could you advise on any > generic rails that could be used to 'mid-mount' a 1-4U server > on that two > port rack? Thank you. > > Regards, > Christopher J. Wolff VP CIO > Broadband Laboratories, Inc. > http://www.bblabs.com > > >

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mid-mount server rails
by Christopher J. Wolff 06 Jul '04

06 Jul '04

Hi Nanogers If I have a two post relay rack, could you advise on any generic rails that could be used to 'mid-mount' a 1-4U server on that two port rack? Thank you. Regards, Christopher J. Wolff VP CIO Broadband Laboratories, Inc. http://www.bblabs.com

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Interesting news story - Cisco Training Manual
by Fisher, Shawn 06 Jul '04

06 Jul '04

http://www.lulu.com/items/59000/59202/print/Basham-whole-text.pdf Interesting story about some professor that wrote a Cisco training manual and made it available for free. The site hosting it is getting crushed a bit today. http://zdnet.com.com/Professor+gives+Cisco+manual+away+for+free/2100-1103_2… <http://zdnet.com.com/Professor+gives+Cisco+manual+away+for+free/2100-1103_2…> &tag=feed&subj=zdnn Pretty basic stuff, but I applaud the generosity of time and effort he must have put into this. ----------------------------------------------- Shawn Fisher Vice President - Advanced Services Bresnan Communications (v) 914.641.3367 -----------------------------------------------

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Trouble with Cox/Verio
by Chip Gwyn 06 Jul '04

06 Jul '04

We've been getting alot of questions about Cox and Verio peering today. Anyone know of something specific going on? Thanks, Chip Gwyn +---------------------------------------------------------------------+ | Chip Gwyn | | Network Support Engineer EMAIL: noc(a)internap.com | | Network Operations Center PHONE: (877) 843-4662 US | | InterNAP Network Services 00800-468-37627 UK | +---------------------------------------------------------------------+ | Visit the Customer Support Site -- https://customers.internap.com | | ---------------------------------- | | Please provide NOC feedback via our Customer Satisfaction Survey at | | https://customers.internap.com/nocsurvey/ | +---------------------------------------------------------------------+ | The contents of this email message are confidential and proprietary | +---------------------------------------------------------------------+

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RE: Quick circuit question.
by Williams, Jeff 06 Jul '04

06 Jul '04

You might find what you're looking for at acterna.com/global/technical_resources/index_gbl.html They're the result of the TTC/ WWG merger. Jeff -----Original Message----- From: owner-nanog(a)merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Scott Weeks Sent: Tuesday, July 06, 2004 1:13 PM To: nanog(a)merit.edu Subject: Re: Quick circuit question. 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 ************************************************************** This message, including any attachments, contains confidential information intended for a specific individual and purpose, and is protected by law. If you are not the intended recipient, please contact sender immediately by reply e-mail and destroy all copies. You are hereby notified that any disclosure, copying, or distribution of this message, or the taking of any action based on it, is strictly prohibited. TIAA-CREF **************************************************************

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Cox.net contact?
by chuck goolsbee 06 Jul '04

06 Jul '04

If there is anyone here from cox.net, I'd appreciate being contacted offlist. ("Normal channels" are frustratingly unresponsive at this time.) Customers we share are having issues we need to resolve for them. Thanks in advance, -- Chuck Goolsbee V.P. Technical Operations _________________________________________________________________ digital.forest Phone: +1-877-720-0483, x2001 where Internet solutions grow Int'l: +1-425-483-0483 19515 North Creek Parkway Fax: +1-425-482-6871 Suite 208 http://www.forest.net Bothell, WA 98011 email: cg(a)forest.net

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802.17 RPR and L2 Ethernet interoperablity (Ethernet over RPR)
by sam_ml＠spacething.org 06 Jul '04

06 Jul '04

Hi, This is probably a fairly simply question, I'm probably just not quite groking the layers involved here. If I had the following setup: Endstation A -- Switch A === RPR Ring === Switch B -- Endstation B could there be a VLAN setup such that Endstations A and B are both in it, and can communicate as if they are on the same LAN segment? (And I mean natively. ie. not using an MPLS VPN). ie. Will the switches involved tranlate the different framing formats in use? Is this vendor dependent? Sam

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