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Joined: Jun 2009
Posts: 13
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Joined: Jun 2009
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HDSL has been the norm for at least five years, meaning one pair is being used to emulate a T1. Yes thank you for the clarification. I also realize transit via PairGain is used quite often these days. However I tend to work more in remote areas where a 2 pair is still the norm. the risk of failure of a typical T1 over copper remains quite high. Quite high compared to what? I hardly ever experience T1 outage problems unless a backhoe has dug into the cabling- or VERY inclement weather conditions..
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Joined: Feb 2011
Posts: 143
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@TeleServPro:
You're likely working in area where the copper is still in fairly good shape. Some of us are not that lucky...
The bottom line is, if OP has reliability issues with his current setup because of less-than-pristine cable feeding his premise, he'll likely have issues with a T-1 if fed out of the same decrepit box...
"...Time moves slowly and it goes so fast..."
(Sandy Denny)
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Joined: Dec 2002
Posts: 9,424 Likes: 1
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Joined: Dec 2002
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We tend to have outside plant related problems when it rains around here. They have had to switch pairs a few times to get our T1s back up.
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: Dec 2005
Posts: 818
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Same here, always worse in the summer when it rains more. Around here we always plan on at least 24 hours of outage a year. We have a few copper CO lines (mainly used for fax and modem otherwise) and a few SIP trunks. The SIP trunks are nice for backup as they are only a few bucks a month plus usage, which is non-existent unless there is a PRI outage.
Steve
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Joined: Feb 2006
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We have a good mix of fiber T1s and copper, both HDSL and 4 wire. The MOST reliable, without question, is fiber. I have 60 T-1/T-3 on fiber and I have never had a service related problem with any of them. Getting them installed and working is a MAJOR headache, but I have never had a reliability issue with them. That said, I insist on, at least, one copper POTS as a backup. 911 calls have to complete, no matter what the circumstance.
The next most reliable is HDSL and I think that's only because their relatively close to the CO. Rain, snow, backhoes and birds with diarrhea will cause problems on copper T-1. Of course, a fiber T-1 doesn't stand a chance with a backhoe, either, but, around here, Verizon has well marked the fiber pathways so it's rare that I see a fiber outage.
Rcaman
Americom, Inc.
Where The Art And Science Of Communications Meet
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Joined: Sep 2006
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A T1 also includes an SLA (service level agreement), which means the carrier has to honor a certain level of uptime (usually 99%) + consistent throughput/latency. A circuit that is guaranteed to work 99% of the time can be out of service one hour every 4 days. Doesn't sound reliable to me.
Arthur P. Bloom
"30 years of faithful service...15 years on hold"
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Joined: Jun 2009
Posts: 13
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To clarify, actual verbiage is 99.99% in most cases. Does anyone guarantee 100%?
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Joined: Nov 2011
Posts: 320
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I can guarantee 100% 100% of the time you will be billed, as for service - thats negligible.
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