On Thursday 02 August 2007 12:18:31 am Reza - Asterisk Enthusiast wrote: > Folks are paying a premium when it comes to "Business" DSL, and the same > DSL is priced almost double for business. I've been assured by other DSL > providers, that they use their OWN equipment, vs. "reselling" Bell's DSL > services & have "confirmed" they are NOT using their Lucent Stingers.
> Additionally I've been told by a number of DSL providers that they do not > use Bell's DSLAM, but have their own DSLAMs ... however they do take > advantage of Bell's already present wiring (thanks to deregulation - but > definitely Bell's not happy!). These must be very large internet providers, as if you're not using Bell's BAS or DSLAM equipment you would have to have your own in every CO you wish to sell service through. That would get expensive in an awful damned hurry, not to mention the colocation expense at each Bell CO and the connection fees to their distribution frames. > words in my personal experience, having 4 people on the phone at exactly > the same given time, no one experienced any degradation in quality with > consumer class DSL service. So I am satisfied. Oh, I agree here; when it works, it works very well. However when it fails, it's not enough for me to have someone to scream at. I guess it's a matter of personal acceptance of risk. Most businesses I know of wouldn't find it acceptable. > DSL VOIP limitations (in case there is no internet). We've obtained > redundancy for less than half the cost of a Full Blown PRI/T1. Necessity > is the mother of invention :). Absolutely; Totally offtopic, but I set up a redundant/bonded connection for a large client out in Listowel, Ontario who needed multihomed internet but of course couldn't get such a thing out there. The solution ended up being extruding an IP over multiple IPSec tunnels to a Xen instance on a multihomed network; Bandwidth to the company is proportional to the number of links up, and if any fail, the connection is maintained. Works across all connection options and since the endpoint itself is highly available and multihomed, it's unlikely they'd go down short of a catastrophic failure. They aren't doing VOIP (yet!) but they do run a lot of video conferencing to the US and Japan. > On top of all this engineering, theoretical and possible screw ups (and > yes, we must be pragmatic as engineers and specialists) --- experience has > proved to me that ADSL and bonded DSL isn't a bad choice and is quite a > stable choice (assuming your internet DSL is stable), in serving our > existing clients who's requirements range from 2 - 15 simultaneous incoming > calls from the PSTN through their SIP trunking. See, that's where my ADSL experience between my sites has been spotty; generally it works, but disconnections at the ADSL layer don't fill me with a sense of security. I'm using Sangoma's S518 internal DSL modems (God I love these things!) and from looking at them I can see that I'm not skinnying up the margins or anything, and since it's mostly working Bell won't look at the physical line. I don't know; I guess I just have shitty copper plant. > Coming back to your statement "However I would *NEVER* suggest standard > grade DSL, bonded or not, for any business without a fallback (analog > lines, cell phone ringdown, etc.)." -- my question to you is "Why Not?", as > long as the client is well aware and educated of the limitations? It comes down to this... When the customer *is* aware of it and accepts it, and it breaks, the customer will still scream at you, claiming the system is unsuitable, unstable, doesn't match what he had before, and it's all your fault. Being able to point out the initialled clause in the contract where these issues were brought to their attention, discussed and accepted isn't worth a whole lot. I would just as soon let someone else handle it. > 1. Are the non-Bell DSL providers who claim not to be on Bells DSLAMs, and > claim not to be reselling Bell's services are lying? I am not sure; my brother (works for Bell in this area) claims that CLECs often have their own DSLAMs, but those DSLAMs would have to be installed in every CO for every community the CLEC wishes to serve. Ikano was an example he brought up, but he hasn't responded to my question regarding the "every community" part -- perhaps they provide their own DSLAMs in some, but piggyback on Bell's on others... > 2. Other than the possibility of the DSL connection going down & bandwidth > limitations -- should I be aware of other limitations? Reseller bandwidth oversubscription -- everyone does it, but to what extent? Remember the old dialup days? Typical overcommit was 7 customers to 1 available line. Much beyond that and the busy signals during busy times were unacceptable. I knew of one provider pushing 10:1 with special "kick scripts" to blow away the abusers during peak times, but that was a special case. Infrastructure of the reseller -- Is their LNS a P4 with 256M of memory and a 265W power supply? > 3. Since we have several clients on DSL/VoIP services -- as mentioned > clients receiving & making 2-15 simultaneous calls to and from the PSTN > (via their SIP trunks), should we be worried of a ticking time bomb here > with VoIP & DSL in terms of VOIP quality of service (except the fact that > DSL internet may be down) No, I certainly don't think so. If it works it'll work forever, unless the provider does something bonedead. -A. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
