RE: dry pair
Here is the Qwest Tariff (assuming your in Colorado.) http://tariffs.uswest.com:8000/docs/TARIFFS/Colorado/COAC/co_a_c_s007p00 1.pdf#USW-TOC00 See sheet 16, near the bottom of the page... It looks like you want an NB3 circuit with DC continuity. -R -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Austad, Jay Sent: August 29, 2003 12:08 PM To: [EMAIL PROTECTED] Subject: dry pair Does anyone know to go about getting Qwest or a CLEC to patch through a dry pair between two buildings connected to the same CO? When I called to order one, no one knew what I was talking about. -jay
RE: dry pair
From: [EMAIL PROTECTED] From what I recall there is no guarentee that the Qwest tarrif for NB3 is actually a straight-through copper pair [section 7.3.1.B.2.a.(4)]... note the restriction of signaling frequency see the Terms Conditions in section 7.3.1.B.2.a.(2). By requesting a circuit that offers 60Hz and/or DC signalling that pretty much requires them to use Copper, if they have it available. The only way to know if they have it available is to order the circuit. After a few days the order will hit their design department which will look at the order and determine if facilities exist to provison the circuit. Some newer office towers and subdivisons/developments may be fed with fiber using Digital Loop Carrier(DLC/SLC) equipment in a CEV hut. While there is still a copper loop to each home or business from the CEV/Hut, the loop ends at the SLC and the voice is converted to PCM over fiber to extend to the C.O. Our Telco uses a slightly different wording in their Tariff for this lack of DC continuity disclaimer...: The provisioning of metallic or DC continuity applied until 1993 12 31. Thereafter, the provisioning of metallic or DC continuity is provided only where metallic facilities currently exist, following normal provisioning practices. Where capacity is exhausted, or where appropriate facilities do not exist, the Company will evaluate all requests and only provide end-to-end metallic facilities at the customer's expense based on the cost incurred by the Company. The largest concern is usually the length of the circuit because how they route the circuit is not always intuitive and the cable may take a circuitous route between your two locations. Usually they can estimate the loop length when the do the design. The limitation on frequency/pulses is largely administrative verbiage. I highly doubt they will install a filter on the circuit to prevent higher speed. (Although it is possible) At one time I think the different speed circuits where priced differently. I suppose a few decades ago the differnce between 30 bits per second and 75 bits per second was considered a large amount of difference. ;-) -Randy
RE: dry pair
How would an alarm company get around this? Would Qwest need to run copper into the neighborhood if any one of the people purchased an alarm? If not, how would the alarm company get the signal pushed through the fiber, and could that be done with the dsl signal? Most home/small business alarm systems use a digital dialer and use a regular dial up phone line. The alarm system dials the alarm monitoring station then uses a low speed data protocol to report the alarm. Of course if the line is cut the alarm can't get through. For businesses that are required to have a monitored/dedicated line on their alarm there is a newer technology called DVACS which uses a low speed Frequency Shift F1/F2 modem to communicate alarms over a voice-band private line. Voice-band (300-3000Hz) private lines as well as 56K/64K DDS and ISDN digital lines can be provisoned over most DLC/SLC fiber systems. -Randy
RE: Sobig.f surprise attack today
Where does one get hold of The List to know if your on it. I've read many of the briefing/press releases put out by the anti-virus companies but they all seem to be witholding the list of master servers. -R -Original Message- Behalf Of Omachonu Ogali Sent: August 22, 2003 2:46 PM If you're responsible for any of the IPs on the list, better permanently remove them from your DHCP pools, IP assignments, dial-up pools, or anything else that assigns IP addresses, because these will be filtered and forgotten for the next 200 years.
Re: East Coast outage?
I wasn't aware that there are high voltage DC long-haul lines that then are converted to AC for local distribution. Another use for HVDC is to isolate transmission networks. Hydro Quebec uses Back-to-Back High Voltage DC conversion equipment at its interconnection points with other transmission networks such as the New York, Vermont and Mass. transmision networks. The HVDC interconnection removes frequency synchronization as a concern at the interconnect and allows much simpler protection and control implementations as there are less electrical properties to consider/monitor/manage at the HVDC interconnect point. Perhaps the H-Q interconnect design is one of the reasons that H-Q was unaffected by the blackout. Conversely, the Lake Erie Loop is an example of a richly meshed ring with multiple paths. when synchronized, flow on the mesh/ring is a function of voltage. To import power into a grid you lower the voltage slightly, to export power you raise the voltage slightly. AC Syncronization across the interconnect can limit power transfer capability. Out of sync condition causes the interconnect to be reactive with current peaks leading or lagging voltage peaks. Phase Angle Regulators (PARs) are transformers with phase shifting capabilities. They are often used at AC interconnect points to manipulate the synchronization to optimize power transfer. -Randy
Availability of Natural Gas during Blackout
Some weeks back there was a dicussion on the merits of naural gas versus diesel generators. It is my observation that Natural Gas continued to be available throught this recent blackout. In speaking to a friend who works for the gas company he informed me that the compressor stations on the main pipelines are driven by gas turbines, thus they don't require electrical power to operate. All telemetering/control equipment on the distribution network is either passive, or equipped with natural gas generators to ensure it operates. Did others notice if there was a gas interuption in your area during the blackout ? (A lot of people here were cooking on their Nat. gas bbque here) This was an exceptionally long blackout, did people have trouble getting diesel fuel replenished? Fuel trucks where no doubt having difficulty with traffic congestion due to traffic lights not working. Regards, Randy
NANOG25-Terminal Room Printer Now Operational
A NANOG25 Info Message: The terminal room printer is now operational It is an HP Laserjet 4100DTN Windows Printing: - Workgroup=01_PRINT_SERVER Server=PRINT_SERVER Printer=Terminal Room Printer - ATLAS IP Printing: See the IP Address posted on the front of the printer. -Randy
RE: Network Reliability Engineering
While it is possible to get the FIT numbers for hardware and calculate network availability, our experience has been that modelling hardware reliability and calculating network availability was not particularly usefull as hardware and fiber transmission systems are usually the least signifigant factor in overall network availability. Hardware failures are also easy to design around by redundant hardware, or more boxes, or diverse fiber routes. Network software issues and Operational mistakes seem to affect Network Availability more than hardware. An example would be a bug in a routing protocol that causes an erroneous update to propagate through the network. Or in the operational category, a typo which causes unintended results. In both cases these failures are not limited to one box, but often cause problems or their effects to propagate throughout the entire network. How do you objectively calculate the network availability when the network is highly dependant upon the correct functioning of a binary blob of proprietary code, but your only visability inside the blob is a release note listing the symptoms experienced by others who have run the code in a similar, but probably not identical network configuration? It seems unlikely that vendors are going to disclose more about their proprietary blob of binary to protect their I.P. assets. This leaves teh netwrok operator without much to assess code reliability. Perhaps we need to change the business model around network code licensing to ensure vendors comprehend the impact of a bad release, and share the pain when they release a buggy blob that has customer impact on the network. Rather than a one-time fee to license the code when you buy the box, a small recurring monthly license fee, with no payment in any month that a software bug crashes your network, would act as a continuous form of positive reinforcement for your box vendor to ensure your network has high availability code. The box vendor would have a recurring revenue stream for software licensing that is only as stable and reliable as their software. -R -Original Message- From: Pete Kruckenberg To: [EMAIL PROTECTED] Sent: 5/18/2002 7:13 PM Subject: Network Reliability Engineering I'm looking for some good reference materials to do some reliability engineering calculations and projections. This is to justify increased redundancy, and I want to include quantifiable numbers based on MTBF data and other reliability factors, kind of a scientific justification instead of just the typical emotional appeal using analyst/vendor FUD. I'd appreciate references on how to do this in a network environment (what data to collect, how to collect it, how to analyze, etc). Also any data (or rules of thumb) on typical MTBFs for network events that I won't find on vendor product slicks (like what's the MTBF on IOS, or human-caused service outages of various types, etc). If someone has put together something remotely like this that they'd care to share, that'd be incredibly helpful. Thanks. Pete.
NANOG 25 - Toronto - Any Questions?
Hi Folks, For those making travel arrangements and planning your time around NANOG25 in Toronto we have a web site with local details up and running. http://139.142.132.40/ If you don't see what you need, or have other questions, please email me off-list and I'll try to dig up what you need. The following is some details we have been asked so far: AIRPORT: The airport you should be heading to is Pearson International/Toronto International CYYZ. (Maps and other details on web site) AMTRAK: There is also AMTRAK service directly to Toronto Union Station. The International runs from Chicago to Toronto. The Maple Leaf runs from NYC to Toronto. GEEK ADVENTURE TREK: Some attendees are planning a trip to Niagara Falls on Saturday. For those arriving early who might want to participate drop me an email and I'll provide the details. CELL PHONE COVERAGE: There are 4 cell phone companies that have coverage in Toronto. Check with your home carrier about roaming in Canada. Rogers ATT Wireless - 800 MhzAAMPS/TDMA http://www.shoprogers.com/store/wireless/overview.asp Bell Mobility - 800MhzBAMPS/TDMA/1.9GhzCDMA-PCS http://www.bellmobility.ca/ Telus(Clearnet) - 1.9GhzCDMA-PCS/800Mhz iDEN/Mike (Nextel) http://www.telusmobility.com/ Microcell - 1.9GhzGSM-PCS http://www.fido.ca/portal/Entree.html PAGER/RIM COVERAGE: Many variables. Check with your home service provider to ensure you have international roaming. SkyTel/Skypage: You need to add International roaming. RIM 950/957 on Mobitex: Cingular in US/Rogers ATT in CA RIM 850/857 on DATATAC: Motient in US/Bell Mobility in CA. Blackberry 5810 on GPRS: ATT Voicestream in US/Rogers ATT in CA. HAM RADIO Yes. Email me. CURRENCY CONVERSION: This meeting should be fairly easy on your expense report. Here are some common currency conversions to the Hudson Bay Peso and the conversion of the CAD$149 hotel room rate. Credit Cards, and Bank ATM/Debit cards usually work with no problem here. USD$1 to CAD$1.56 (Hotel Room USD$95) GBP 1 to CAD$2.27 (Hotel Room GBP 65) EUR$1 to CAD$1.40 (Hotel Room EUR$105) YEN 100 to CAD$1.22 (Hotel Room YEN 12,228) Randy Neals Group Telecom [EMAIL PROTECTED]
RE: Google doing regional preferencing on results?
Google appears to have the capability to georeference their index by country and possibly with even finer geographic granularity. I noticed that they are now redirecting users to country specific versions of their web page which appears to be done through the various IP address to location tools. Given that Google *seems to know* where the user is, and where the web pages are, perhaps they are now including geographic relevance in the search engine relevancy metrics. Or maybe not! These are only my observations. (I've also noticed that I have had more connection errors recently in initially connecting to the google site and this coincidently started about the time that we began being automatically redirected from the www.google.com to www.google.ca) -Randy -Original Message- From: Steve Goldstein [mailto:[EMAIL PROTECTED]] Sent: April 26, 2002 12:52 PM To: Avleen Vig Cc: [EMAIL PROTECTED] Subject: Re: Google doing regional preferencing on results? **If** they cache and replicate, it could be that the caches are not always identical in different places. If they are replicated, perhaps a replication cycle lagged in one of the two locations. --Steve At 5:36 PM +0100 4/26/02, Avleen Vig wrote: it gives you different results depending on where in the world you search from.
RE: If you were in a government Cyber-warning center
Conduit? What's THAT ;-? Only exposed (bridge crossing, etc) parts are in conduit. Conduit is typically used along the entire length of most railway builds I have seen. Most recent railway builds have been multi conduit projects with up to 12 x 1.5 inch HDPE conduits plowed in by rail mounted cable plow. Your correct that steel conduit is used at bridge crossing or other exposed locations. I understand that when railway routes became popular some years ago for telecom that some railway/telecom companies did some research to understand where to place the cable with respect to the rail to minimize damage in a derailment. Apparently by placing the conduit 3-4' down and relatively close to the rail (ie: 2-3' from the rail) the steel rail will act somewhat as a shield to minimize exposure of the cable in a derailment. (ie: the car has to rip up the trackage and move the dirt to get to the cable) -Randy
