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: 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
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: 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. >
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
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
