help on making a decision - aSynchronous versus Synchronous connection

I'm trying to make a deicsion between implementing an aSynchronous connection or a Synchronous connection.  The Synchronous connection is a full T1 and is 1.5 mbps up and down...  The aSynchronous connection is a cable modem and is 12 mbps down and 2 mbps up.  The network has about 15-20 web application users that hit a web app during working ours.  They also host their own emails, so, emails are being sent out and received at the same time.  They also have about 5 users browsing.  Since the aSynchronous has such a large down stream will it basically perform the same as the T1 when the upstream is congested?  I was thinking that due to the downstream being so large that even if the upstream gets congested that much of a downstream will still result in decent browsing?!  correct?  The cable connection is less money per month so I'm leaning towards it assuming there won't be performance issues...  It's more important that the upstream is available without killing the downstream completely.
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Go with the Cable connection.  Unless you bond several T1's together for 3mbps+ speeds (and much more money), it won't be worth it.  For the size of your network, the 2mbps upstream should be plenty, even with your own email server.

If down the line you decide you need more bandwith... you could always purchase a load-balancing firewall and add an additional cable modem or T1.

Even though T1 services are "generally" more reliable, and provide SLA's (Service Level Agreements), I've experienced more problems with T1's than with Cable connections.

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gopher_49Author Commented:
I'm experiencing performance issues at our headquarters with our bonded T1's...  Even bonding them together we still get poor performance... The upstream is just fine, however, the down stream is just so slow when also factoring in that our Cisco ASA 5510 has a CSM module that scans all HTTP / SMTP traffic...  

I'll stick with the cable modem at this site for it's less money and it seems even if the upstream gets hammered the downstream is so large it can take a hit and still have plenty of bandwidth.

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