Contract # GS00T01AHD0002 
Proposal to Add Federal Telecommunications Service   Long Distance (FTS LD) 
Service Level Agreement (SLA)   Service 
Availability Guarantee 
Customers of the AT&T DSL Internet Service who have purchased and been 
provisioned with Multi User Service ( Customers ) are provided a limited guarantee 
of service availability, subject to the Program Rules and Regulations set forth in the 
AT&T DSL Internet Service Guide. If a Customer experiences a Service Outage in 
excess of ________________ for any of Customer's Multi User DSL lines during 
any calendar day, the Customer will be eligible for a credit ________________ of the 
Customer's Monthly Service Fee for such Multi User DSL line, subject to the 
maximums specified in the Programs Rules and Regulations. 
6.8.2  How DSL Works 
Traditional phone service (sometimes called POTS) connects the customer to a 
telephone company office over copper wires that are wound around each other and 
called twisted pair. Traditional phone service was created to let the customer 
exchange voice information with other phone users and the type of signal used for 
this kind of transmission is called an analog signal. An input device such as a phone 
set takes an acoustic signal and converts it into an electrical equivalent in terms of 
volume and pitch. Since the telephone company's signaling is already set up for this 
analog wave transmission, it is easier for it to use that as the way to get information 
back and forth between the Government's telephone and the telephone company. 
Because analog transmission only uses a small portion of the available amount of 
information that could be transmitted over copper wires, the maximum amount of 
data that the Government can receive using ordinary modems is about 56 Kbps. The 
ability of the Government's computer to receive information is constrained by the 
fact that the telephone company filters information that arrives as digital data, puts it 
Use or disclosure of data contained on this sheet is subject to the restriction on the title page of this proposal. 
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