Centers for Disease Control and Prevention, Procurement and Grants Office, 255 East Paces Ferry Road, NE, Room 500, Atlanta, Georgia 30305

D -- INTERNET SERVICE PROVIDER SOL 98I001 DUE 121697 POC Phillip Green, Contract Specialist, (404) 842-6573 THIS NOTICE CONSTITUTES AMENDMENT NO. 1 to the Request for Proposal 98I001 for Internet Service Provider previously published November 25, 1997. Offerors shall acknowledge all amendment(s) in their proposal. This notice serves as the official amendment to subject RFP 98I001. A separate hard copy amendment will not be issued. The purpose of this amendment is to provide responses to questions submitted by potential offerors as follows: 1. QUESTION: What will this Internet access be used for? Inbound/outbound Email? Access to a self-hosted Web site? Outbound Internet access for LAN attached users? Inbound/outbound FTP site access? Any other types of access? 1. RESPONSE: The service will be used for inbound and outbound TCP-IP traffic of all usual types including HTTP Web access to and from CDC, FTP, SMTP, and other types of access. These are the largest uses of access by far (again to restate, HTTP/FTP/SMTP protocols) and accounts for near 90% of all CDC Internet based traffic currently. Potentially thereare secured remote node extensions and LAN based use which might occur, but this is not the current primary intent or use of the CDC Internet link. Current applications are all self-hosted (Web/FTP/Mail/etc.). 2. QUESTION: What type of peak traffic periods are you currently experiencing on your existing access? If you can break it down to hits/bandwidth peaks per hour per access classification, that would be very useful. If not, when are your peaks and how often do they occur? 2. RESPONSE: Currently traffic peak loads occur throughout the working day using an inverse multiplexed 3 Mbps link to the Internet (i.e. bandwidth saturation occurs at peaks and can sustain near the 3 Mbps peak for seconds at a time causing retransmissions to be required). The 3 Mbps bandwidth is acquired through using two standard T-1 interfaces in an aggregate inverse multiplexed mode. Trending traffic pattern indicates a smooth growth scale which has not diminished over the past 24 months of monitoring. Typically traffic peaks occur between 9:00 to 12:00 EST/EDT and 1:00 to 4:00 EST/EDT. Other information are to data typing 'traffic mix' is provided in question 1's answer albeit not specific. 3. QUESTION: Concerning requirement #3: would Frame Relay PVC be acceptable bandwidth? 3. RESPONSE: (3) the service data link bandwidth is available for bi-directional transmissions (i.e. to CDC from the Internet or vice versa) and is not shared with other ISP customers between CDC and the ISP's POP 4. QUESTION: Concerning #8 (h.): Is the back-up capability provided for the failure of an ISP Mail Host or a failure of a CDC Mail server? 4. RESPONSE: 8) this is to provide backup in case of the failure of a CDC mail host. The due date for submission of offers IS NOT extended. Offers are due December 16, 1997, 2:00 P.M. local time. Please submit offers to the Centers for Disease Control and Prevention/PGO, Attn: Phillip R. Green, 255 East Paces Ferry Road, N.E., Rm 419, Atlanta, Georgia 30305. (0343)

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