text: Chapter 2
  Link layer encryption isolates the network backbone (the wide-area network) from external networks. Refer
  to ATP 6-02.60 for more information about colorless core architecture.
  Transport Convergence
  2-267. The Army has long maintained separate tactical transport networks to support the communications
  requirements of different functional areas—command and control, intelligence, logistics, and medical. A unit
  with all of these networks has used four separate satellite communications terminals and four sets of
  networking hardware with all the associated manning, physical security, configuration and patching, and
  logistics support requirements; four separate DODIN operations chains of authority; and up to four separate
  commercial satellite leases. Converging the transport for these networks onto a common network transport
  medium makes better use of resources and assets, leverages existing infrastructure, increases network
  security, and simplifies network management, while reducing reliance on leased commercial satellite
  resources.
  2-268. The Army is migrating the network transport for the tactical portions of these networks onto a single
  transport medium using the colorless core architecture. The first phase of transport convergence integrates
  the top secret/sensitive compartmented information intelligence network into the colorless core architecture
  to brigade level in the deployed portion of the network. The sensitive compartmented information data is
  encrypted end-to-end from the TROJAN Network Control Center to the G-2 (S-2) section. The signal systems
  provide only network transport. The G-2 (S-2) section continues to perform DODIN operations functions for
  top secret networks.
  2-269. The extra demand for data throughput over the converged transport requires DODIN operations
  personnel to manage bandwidth apportionment and quality of service rules for the different classes of data,
  based on mission requirements. Bandwidth apportionment ensures the converged transport provides the same
  quality services as the legacy capabilities.
  OPERATING ENVIRONMENTS
  2-270. Work, deployed, and home or mobile represent the DODIN-A operating environments. Sharing
  configurations and security standards allows these environments to operate as a single, integrated network.
  Work Environment
  2-271. Generating forces occupy posts, camps, and stations worldwide supporting the geographic
  combatant commanders. The work environment represents the Army in-garrison, using the DODIN-A as a
  strategic capability to support the generating force and shaping operations. Forward-deployed posts, camps,
  and stations rely on Defense Information Systems Agency long-haul transport for connection to enterprise
  services.
  Network Enterprise Center
  2-272. The network enterprise center is the facility that provides and acquires telecommunications and
  information management services on Army installations (ATP 6-02.71). The network enterprise center
  manages the installation campus area network and ensures service quality for supported units at their home
  station. The campus area network connects installation-based users to the DISN, secure data stores, and
  baseline common services on a non-reimbursable basis. The network enterprise center provides information
  technology services other than those on the baseline services list on a fee-for-service basis (refer to AR
  25-1). Strategic signal battalions operate the network enterprise centers. The network enterprise center
  delivers these baseline services to units in garrison:
  * Communications systems and system support services.
  * Telephone and data infrastructure services.
  * Emergency communications telephone services.
  * Wireless infrastructure services.
  * Video teleconferencing services.
  * Range and field telephone services.