With a chance to save a few bucks, DSL is hot in the DC market. I know of
only one provider that offers a managed DSL circuit and they are doing this
in an odd way. DSL CPE to Dslam at the CO. Combination of frame and ATM
back to our Cat 5500 DS3 module. The cheap CPE equipment does not support
snmp traps, so the provider traps the port in the dslam for errors. The
problem with this is they are not trapping data errors, so they can have a
good signal and no data flow. In this case a simple $10 ping utility beats
the 1/2 mill snmp system that is in place, we catch them every time.
Packet loss is a big problem. Most installations are on existing copper, as
long as the original installation is brought up, the copper is considered
good, no matter the packet loss.
Another problem is with humidity, if you get a few rain showers, humidity
increases and causes a voltage drop in the old copper. No voltage, no
circuit. Winter has increased the reliability of almost all of our DSL
circuits.
Everyone is always looking to have a cheaper solution.
I could go on, but this is enough.
Good luck with the DSL.
Mark Krysinski
CTO
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Chuck Larrieu
Sent: Thursday, January 11, 2001 4:08 PM
To: info; [EMAIL PROTECTED]
Subject: RE: WAN Backbone over DSL?
My employer sells this solution all the time.
When one of these things comes in front of me, I ask the customer the
following:
1) what is your data flow? How much data are you moving, and from where to
where?
2) Are you comfortable with the asynchronous nature of DSL. Is upload speed
as important as download speed?
3) Are you aware that DSL is UBR ATM? I.e. you are not guaranteed any speed.
What you are given is a theoretical maximum. There is no QoS possible
either, if you are thinking about time critical stuff, of reliability of
throughput.
Someone else mentioned reliability issues. I don't know. My DSL has been
every bit as reliable as anything else I have ever had experience with. I
once has a frame relay link between two of my offices down for a week while
the telco swore to god they were able to test end to end. Wanna guess what
they found after I told my account rep that I considered our contract null
and void? So bad service and prolonged outages can happen with any
transport.
I tell customers that it is the application and the value of that
application that should drive any provisioning decision. DSL is cheap. But
will it truly serve your purpose?
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of info
Sent: Thursday, January 11, 2001 11:53 AM
To: [EMAIL PROTECTED]
Subject: WAN Backbone over DSL?
Anyone experimenting/using DSL for a WAN backbone?
Please email me your experiences....and I'll share with you
mine.
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