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System interconnection is

the direct connection of two or more IT systems for the purpose of sharing data and other information resources.[1]


A system interconnection has three basic components: two IT systems (System A and System B) and the mechanism by which they are joined (the “pipe” through which data is made available, exchanged, or passed one-way only).


Interconnection life cycle[]

The four phases of the interconnection life cycle are:

  • Planning the interconnection: the participating organizations perform preliminary activities; examine all relevant technical, security, and administrative issues; and form an agreement governing the management, operation, and use of the interconnection.
  • Establishing the interconnection: the organizations develop and execute a plan for establishing the interconnection, including implementing or configuring appropriate security controls.
  • Maintaining the interconnection: the organizations actively maintain the interconnection after it is established to ensure that it operates properly and securely.
  • Disconnecting the interconnection: one or both organizations may choose to terminate the interconnection. The termination should be conducted in a planned manner to avoid disrupting the other party’s system. In response to an emergency, however, one or both organizations may decide to terminate the interconnection immediately.