System interconnection is
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).
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.
- NIST Special Publication 800-47, at D-2.