I've found that T1 is fast becoming an after thought when building the circuit backbone of a network in todays business world. The scope and complexity of applications just aren't approrpriate for a T1 anymore. Think multi-media, CAD, video-conferencing, disaster recovery, supply chain management, medical imagery, etc. for example ... and for purposes of the forum here Data Centers.
DS3 bandwidth and ethernet are more suited to today's business environment. Particularly when multiple locations are involved. Think MPLS there.
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