Monday, March 30, 2009

T1 Bandwidth VS A DSL Line .... Do The Same Distance Restrictions Apply?

The general answer is no. T1 Bandwidth does not have maximum distance "limitation" as does DSL. Network carriers can use multiple T1 repeaters to regenerate (not just amplify) the T1 signal.

However, 2 distance "sensitive" components can increase T1 cost.

First, the T1 access loop. Most local exchange carriers (LECs) (e.g., AT&T/SBC/BellSouth, Qwest and Verizon) charge the ISP for T1 access based on distance between the ISP's router (Internet POP) and the customer's local serving exchange (LEC Central Office.) That is why most ISP's T1 quote tools require the customers local phone number, or at least the 1st 6-digits (NPA-NXX) which identify the local CO exchange, in order to caculate the distance to the ISP's closest IP POP (Internet router).

Second, extrordinary construction costs. If the customer location is a great distance from the closest T1-equipped LEC central office, then the LEC must install addition T1 repeaters and possibly incur other transmission equipment / construction costs to reach the customer. In this case, the LEC has 2 options to deal with construction cost: either absorb cost themselves, or pass it on to the ISP who then pass it on to the end-user customer.

Assuminng no extrordinary construction cost, there are ISPs that offer flat rate Internet T1s for $500-750 per month, anywhere in US, with no distance limitations between ISP POP and customer's serving CO. The flat rate cost includes T1 access loop and 1.5 Mbps Internet port.

However, for most locatons that are under 25 miles to the ISP POP, we are seeing Internet T1 prices in general range of $300-$400 per month +/-.

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