The sales team I work with pushes this solution. Particularly in conjunction
with what we call RLAN ( remote LAN ) where branch offices will have either
frame-relay or DSL, and both are terminated onto the ATM cloud with IMA at
the central site. I've sold two of these, installed one, and it is great,
once it is up and working. In this part of the world there are known issues
between the Cisco IMA card and central office Newbridge ATM switches.
Nothing major. Just an annoying requirement that Cisco port 0 has to
terminate in Newbridge port 0 etc. No mixing or crossovers. Supposedly
Newbridge corrected the problem in their code that caused this "quirk" but
if they have, then apparently the telco out here has not applied the patch.
Frame to ATM ( FRATM ) and DSL to ATM offer a LOT of flexibility to folks
with smaller networks, where services are centralized and there is a lot of
strain at the center. The IMA option alleviates this, while at the same time
allows one to take advantage of DSL without having to install VPN's. I
consider this the next step up after frame relay. If your carriers offer
this service, I believe it is worth at least considering.
All telcos are flaky, BTW, no matter what the transport. . JMHO
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Craig Columbus
Sent: Wednesday, January 17, 2001 7:30 PM
To: [EMAIL PROTECTED]
Subject: RE: Sorta OT: More than T1, less than T3...
Thanks guys for all the good comments. I'm going to look into the standard
mux/imux stuff, but the ATM IMA solution sounds interesting. How many out
there have implemented this? Is it reliable? (ATM has been a bit flaky
for me in the past.) How does the cost per ATM line compare to standard T1
per line?
Craig
At 06:06 PM 1/17/2001 -0800, you wrote:
>Check with you local carriers to see if they can provide you with ATM IMA
>service.
>
>This is pretty neat. Cisco and other vendors have products which allow you
>to take in ATM lines in increments of 1.54 mbs ( T1 ). These are ATM
>circuits. For a Cisco 26xx router or above, you can purchase ATM IMA cards
>with 4 or 8 port capacity, meaning up to 12 mbs total bandwidth. As you add
>T1's the IMA multiplexes those into one fat pipe.
>
>The nice thing is this can grow with you.
>
>As with everything else in the data comm world, YMMV
>
>Chuck
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