Contract # GS00T01AHD0002 
Proposal to Add Federal Telecommunications Service   Long Distance (FTS LD) 
Chiller plants and multiple CRAC units provide air conditioning. The CRAC units 
are strategically located to deliver lower temperature conditioned air to maintain a 
room temperature of 72 F. Internet 
Center Network Infrastructure 
AT&T has designed and built reliability into the network infrastructure of each of the 
Internet Data Centers through the use of proven network components, backup or 
failover hardware, and configurations engineered to provide no single point of failure. 
Each Internet Data Center utilizes two or more Cisco 7513 or Cisco 12000 Gbps 
routers to transmit and receive data over high speed connections that leave the facility 
through separate exits and travel physically diverse paths to multiple backbone nodes.  
AT&T provisions and maintains all network connections from the Internet Data 
Centers to the AT&T Global IP Network.  
6.8  Broadband Business Services 
6.8.1  AT&T Digital Subscriber Line (DSL) 
DSL is a broadband access technology that allows transmission at bandwidths from 
144 Kbps to 1.5 Mbps. DSL offers high bandwidth at lower prices than other types of 
Private Line access. DSL Technology is available in several varieties. AT&T DSL 
Internet Service utilizes Symmetric Digital Subscriber Line (SDSL), ADSL and 
ISDN Digital Subscriber Line (ISDL) access technologies (described below). The 
type of DSL access utilized will depend upon the access speed and the distance the 
user is from the central office. The maximum speed possible on a circuit varies 
inversely with the length of the local access. The longer the access, the smaller the 
data speed. The suite of DSL services that are available from AT&T include: 
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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