“Isn’t DSL or Cable sufficient for my office?” This depends upon the size of your company and how you’re going to use the bandwidth. If you have 10 or more employees all using an internet connected computer plus a telephone line each, it would be advantageous to have a full T1 installed.

T1s are usually the preferred choice of communications for businesses that have moderately high bandwidth needs with many users (upwards of 40 with low/moderate use) AND that require a stable, reliable, constant connection. A T1 line can send a gigabyte of information in less than 10 seconds and since the upstream/downstream bandwidth is symmetrical, it has the capability of many simultaneous "conversations" or voice/data/video connections within. Whether it's for internet access or telephone  service, your T1 will have an average uptime of near 100%, compared to DSL and Cable which can randomly experience outage problems throughout the  day, whether it's for a split second or several minutes/hours- mostly due to the line being shared, oversubscribed, and of lower quality. Many T1 carriers will even guarantee a certain level of uptime such as 99.9% (for internet connectivity) secured with a contract called an SLA (Service Level Agreement) which will reimburse you with a credit for that month should the line become interrupted for any reason. If you're planning on operating a Voice over IP (VoIP) phone system, T1 will provide much better call quality compared to DSL and Cable because a T1 is a dedicated connection to your local phone company’s central office, and unaffected by excess bandwidth usage from your neighbors- as a result: lower latency and higher throughput.