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2. Leased line - Wikipedia

   en.wikipedia.org/wiki/Leased_line

   Leased line services (or private line services) became digital in the 1970s with the conversion of the Bell backbone network from analog to digital circuits. This allowed AT&T to offer Dataphone Digital Services (later re-branded digital data services) that started the deployment of ISDN and T1 lines to customer premises to connect.

3. T-carrier - Wikipedia

   en.wikipedia.org/wiki/T-carrier

   The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.

4. Internet access - Wikipedia

   en.wikipedia.org/wiki/Internet_access

   A T1 line carries 24 voice or data channels (24 DS0s), so customers may use some channels for data and others for voice traffic or use all 24 channels for clear channel data. A DS3 (T3) line carries 28 DS1 (T1) channels. Fractional T1 lines are also available in multiples of a DS0 to provide data rates between 56 and 1500 kbit/s.

5. Covad - Wikipedia

   en.wikipedia.org/wiki/Covad

   Covad was the first service provider to offer a national DSL broadband service. In addition they offered Voice over IP, T1, Web hosting, managed security, IP and dial-up, and bundled voice and data services directly through Covad's network and through Internet Service Providers, value-added resellers, telecommunications carriers and affinity groups to businesses.

6. Netscape ISP Plans - AOL Help

   help.aol.com/articles/netscape-isp-plans

   Netscape Internet Service powered by AOL partners with top identity protection and data security businesses, bundling multiple state-of-the-art services like McAfee® Multi Access to help provide an all-in-one comprehensive and affordable approach to help keep your data safe from online threats. All Netscape Internet Service plans include ...

7. Primary Rate Interface - Wikipedia

   en.wikipedia.org/wiki/Primary_Rate_Interface

   It is based on T-carrier (T1) transmission in the US, Canada, and Japan, while the E-carrier (E1) is common in Europe and Australia. The T1 line consists of 23 bearer (B) channels and one data (D) channel for control purposes, [ 1 ] for a total bandwidth of 24x64-kbit/s or 1.544 Mbit/s.