






                                       PSINet


            _A_d_d_r_e_s_s:
               Performance Systems International
               11800 Sunrise Valley Drive - Suite 1100
               Reston, VA 22091

            _E_m_a_i_l: info@psi.com

            _P_h_o_n_e: 1-800-82PSI82
               (703) 620-6651
               FAX: (703) 620-4586

            _D_e_s_c_r_i_p_t_i_o_n

            PSINet is a US-based commercial,  national  TCP/IP  and  OSI
            internetwork available throughout the continental US, Canada
            and Israel, with a wide spectrum of services for the indivi-
            dual  and  corporate user of electronic information.  PSINet
            is currently a T1-based network co-located in telephone com-
            pany  facilities;  it consists of over two hundred organiza-
            tional networks.  The PSINet operations center,  located  in
            Albany,  NY,  operates twenty-four hours a day, seven days a
            week. (A regional office is located in Santa Clara, Califor-
            nia.)  Local  phone  numbers through PSI's Individual Dialup
            Service (IDS) provides  free  telnet/rlogin  access  to  any
            PSINet  dedicated  data line (SCS and CCS) customer sites in
            nearly forty cities throughout the US.

            TCP/IP packet access is also  provided  on  a  dialup  basis
            using V.32 modems in more than thirty cities.  Three times a
            year a PSINet users group (PSITech)  meets  to  discuss  new
            services, new technologies, and operational requirements.

            PSI's PSILink personal Internet access service  is  provided
            on  a dialup basis in over 170 cities throughout North Amer-
            ica, Europe and the Pacific Rim. The service includes  elec-
            tronic  mail, USENET News, and anonymous file transfer capa-
            bility.  Free PSILink software for the PC, developed by PSI,
            is also provided.

            _________________________
            The information in this section is provided  in  accor-
            dance  with the copyright notice appearing at the front
            of this guide.




            September 4, 1992           NNSC       Section 5.36,  Page 1








            PSINet provides internetworking  services  to  the  NYSERNet
            user  community,  and  also has connections to the NSFNET in
            Ithaca, NY.

            _N_e_t_w_o_r_k _A_c_c_e_s_s

            Any IP host on the Internet may access PSINet sites.

            _W_h_o _C_a_n _U_s_e _t_h_e _N_e_t_w_o_r_k

            There are no restrictions on use of PSINet for  any  purpose
            (including commercial) by its customers.  As a co-founder of
            the  Commercial  Internet  Exchange  (CIX)  with  the  other
            unrestricted-usage   commercial  providers,  this  important
            capability is being widely extended throughout the US.

            _M_i_s_c_e_l_l_a_n_e_o_u_s

            Network software research and development is done within PSI
            and  is  exported  at  no  cost or nominal cost to academic,
            government, and nonprofit organizations.  Exported  technol-
            ogy  includes  SNMP,  Z39.50,  and  X.500.   PSI provides an
            entry-level UUCP email service and  a  White  Pages  service
            available over the Internet (see section 4.3 of the Internet
            Resource Guide).  ClariNet News, a live electronic newspaper
            from ClariNet Communications Corp., is also available to PSI
            customers through the PSINet system.
























            September 4, 1992           NNSC       Section 5.36,  Page 2


