Re: [uknof] Guestimating fibre distances and RTT
On 29 April 2014 19:21, James Bensley wrote: > (300,000,000m/s*0.6) * (18000m) = Meant to write! 43400m/18000mps
Re: [uknof] Guestimating fibre distances and RTT
On 29/04/2014 19:21, James Bensley wrote: > What is the general rule of thumb when guestimating round trip time > for new fibre installs? 1ms per 100km of fibre cable. -ish. Nick
[uknof] Guestimating fibre distances and RTT
Hi All, What is the general rule of thumb when guestimating round trip time for new fibre installs? I'm particularly interested if anyone can reference any reliable source (not sure what that would be?) that gives a decent rule of thumb and why it is reliable enough to be usable given a reasonable error of margin; I'm ordering a new single mode link to be installed between two PoPs in England with a radial distance of 31Km to each other, so for actual fibire length I would typically add about 35-40% to represent a likely worst case scenario [1]. So to calculate the delay I can say (c in meters per second); (c*0.6) * (31000*1.4) = (300,000,000m/s*0.6) * (18000m) = 0.0002411 seconds, or 0.24ms. I can safely assume that I would very likely get a 5ms RTT here. Infact I would likely get sub 1ms (usinig the latest hardware the control plane time for responding to a ping for example is microsends it seems, assuming queueing, encoding and serialisation delay of this link which will be 10GigE). Before this project could have even come to light if someone had said to me "Can you provide a link between these two PoPs that will have a latency lower than 2ms?" - Assuming all the above accurately relates to the real fibre properties I could say "Yes!" (subject to surveys, legel get outs blah blah blah). This project is already rolloing but I'm wondering what would others have quoted as a likely RTT for this example 31Km radial distance? Kind regards, James. [1] I know its perfectly possible the fibre route may well go via Timbuktu and back but in 95%+ of cases 40% extra distance covers it, in my experiance.
Re: [uknof] Vodafone / SureSignal contact
Gary. This was our last approach, although it took joining their Twitter and badgering them something rotten to get them to respond to the thread on the SS forum, and still took a couple of weeks to be addressed.. Cheers Peter Knapp From: uknof [mailto:uknof-boun...@lists.uknof.org.uk] On Behalf Of Jamie Walmsley Sent: 29 April 2014 13:27 To: Gary Steers Cc: uk...@uknof.org.uk Subject: Re: [uknof] Vodafone / SureSignal contact I had this issue a couple of years ago - I ended up posting on the Sure signal section of their official forums and a vodafone mod who replied passed on the affected IP range(s) to the correct team for white listing (who resolved it fairly quickly) Might be worth trying that approach if you dont have any luck via other contact methods.
Re: [uknof] Vodafone / SureSignal contact
Hi Gary... Had the exact same Experience... We didn't make any progress with Vodafone support on the issue ... I wish I could help you more On Mon, Apr 28, 2014 at 5:51 PM, Gary Steers wrote: > Hi All, > > Does anyone have a contact at Vodafone in the SureSignal team at all? > Having issues with one of our ranges and need to investigate it... > > Gary Steers > Chief Network Engineer | Sharedband > -- SHAREDBAND EMAIL DISCLAIMER -- > Email Disclaimer: http://sharedband.com/email-disclaimer/ > > Shared Band Ltd T/A Sharedband Ltd > Registered in England No 04861356, VAT No GB822654826 > Registered Office: 40 Princes St, Ipswich, Suffolk, IP1 1RJ UK > > Sharedband Technologies, LLC > 2033 6th Avenue, Suite 902, Seattle, WA, 98121 US > > -- Kindest regards, Tom Smyth Mobile: +353 87 6193172 - PLEASE CONSIDER THE ENVIRONMENT BEFORE YOU PRINT THIS E-MAIL This email contains information which may be confidential or privileged. The information is intended solely for the use of the individual or entity named above. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this electronic transmission in error, please notify me by telephone or by electronic mail immediately. Any opinions expressed are those of the author, not the company's .This email does not constitute either offer or acceptance of any contractually binding agreement. Such offer or acceptance must be communicated in writing. You are requested to carry out your own virus check before opening any attachment. Thomas Smyth accepts no liability for any loss or damage which may be caused by malicious software or attachments.
Re: [uknof] Vodafone / SureSignal contact
I had this issue a couple of years ago - I ended up posting on the Sure signal section of their official forums and a vodafone mod who replied passed on the affected IP range(s) to the correct team for white listing (who resolved it fairly quickly) Might be worth trying that approach if you dont have any luck via other contact methods.
Re: [uknof] Vodafone / SureSignal contact
Hi All, So, I now have a "semi"-bulletproof way of at least getting to the right team, as most of you probably know Vodafone operate a whitelist for IP ranges as they only want the suresignal to work in the UK. Sometimes (most of the time) IP ranges do not automaticly get picked up from what I have been told, however if you use the following number to get through to the suresignal team... Dial 08700 700 191, when asked for mobile number press #, then use the following options (correct as of April 2014) Op 2, Op 2, Op 2, Op 2, Op 5 Once you are through to the SureSignal team asked to be put through to the 'TRAC' team, these guys are UK Based 3rd line support and know what they are talking about. Our range is in the process of being whitelisted and should be complete in 24-48 hours, I have asked if there is a more direct route as getting escalated to them may be the problem, if they come back with anything useful I'll update you all! Gary -Original Message- From: uknof [mailto:uknof-boun...@lists.uknof.org.uk] On Behalf Of Gary Steers Sent: 28 April 2014 18:39 To: Tom Smyth Cc: uk...@uknof.org.uk Subject: Re: [uknof] Vodafone / SureSignal contact Hi All, Managed to get through to the team with the following “secret” key combination… Dial 08700 700 191 Wait for the S5 message to finish and when being asked for your mobile number press # This should then ask if its PAYG/pay monthly, at this point use the following options Op 2 – Pay Monthly Op 2 – Support Op 2 – Trouble using your device / something else Op 4 – SureSignal My issue still isn’t fully resolved, however there is promise as they can see that my range is “not working”, I need to speak to a higher team between 8am and 6pm… If anyone else is having issues this may help you out, but may just be the luck of the draw in who you speak to the other end… Once I’ve spoken to them tomorrow if I get any better contact details I’ll share with everyone on list ☺ Gary Steers Chief Network Engineer | Sharedband From: Tom Smyth [mailto:tom.sm...@wirelessconnect.eu] Sent: 28 April 2014 17:58 To: Gary Steers Cc: uk...@uknof.org.uk Subject: Re: [uknof] Vodafone / SureSignal contact Hi Gary... Had the exact same Experience... We didn't make any progress with Vodafone support on the issue ... I wish I could help you more On Mon, Apr 28, 2014 at 5:51 PM, Gary Steers wrote: Hi All, Does anyone have a contact at Vodafone in the SureSignal team at all? Having issues with one of our ranges and need to investigate it... Gary Steers Chief Network Engineer | Sharedband -- SHAREDBAND EMAIL DISCLAIMER -- Email Disclaimer: http://sharedband.com/email-disclaimer/ Shared Band Ltd T/A Sharedband Ltd Registered in England No 04861356, VAT No GB822654826 Registered Office: 40 Princes St, Ipswich, Suffolk, IP1 1RJ UK Sharedband Technologies, LLC 2033 6th Avenue, Suite 902, Seattle, WA, 98121 US -- Kindest regards, Tom Smyth Mobile: +353 87 6193172 - PLEASE CONSIDER THE ENVIRONMENT BEFORE YOU PRINT THIS E-MAIL This email contains information which may be confidential or privileged. The information is intended solely for the use of the individual or entity named above. If you are not the intended recipient, be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this electronic transmission in error, please notify me by telephone or by electronic mail immediately. Any opinions expressed are those of the author, not the company's .This email does not constitute either offer or acceptance of any contractually binding agreement. Such offer or acceptance must be communicated in writing. You are requested to carry out your own virus check before opening any attachment. Thomas Smyth accepts no liability for any loss or damage which may be caused by malicious software or attachments.
