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DEFENSE SWITCHED NETWORK (DSN)

As approved by OSD, the DSN is an interbase, non-secure or secure C2 telecommunications system that provides end-to-end command use and dedicated telephone service, voice-band data, and dial-up VTC for C2 and non-C2 DoD authorized users in accordance with national security directives. Non-secure dial-up voice (telephone) service is the system's principal requirement.

The primary function of the DSN is to provide non-secure dial-up voice service. The DSN provides rapid, reliable, survivable, non-secure/secure, and economical C2 telecommunications. To take advantage of economies of scale, the DSN also provides service to non-C2 users on a not-to-interfere basis.

The DSN system is used only for official business or in the interest of the government and is the first choice for all switched voice and dial-up video telecommunications between DoD user locations.

	Using the DSN Guidance on how to make a call, using commercial toll free services, security guidelines, and other helpful information.		Connecting to the DSN Policy and procedures governing connection approval of telecommunications products.
	Information Assurance A central repository of voice system related security information.		Configuration Management An overview of the effort to maintain end-to-end Configuration Management of the DSN.
	General Information A general overview and history of the DSN.		Emerging Technology Keeping users apprised of new technologies and/or issues that may affect the DSN.