The EOF LAN will provide a high speed (e.g. FDDI or copper FDDI) connection between resident systems to allow the exchange of catalogs, scientific data (including large-format images), engineering data, and planning data among the instrument and flight operations teams. All EOF resident workstations will use the EOF LAN to communicate with the Core System and other resident workstations.
The EOF LAN is a collection of Ethernet sub-segments, joined together in a high speed router. The ECS sub-LAN is to be CDDI.
The EOF LAN will provide a secure interface (e.g. a multiprotocol-filtering bridge or router) that will protect the secure elements of the LAN (the IWSs used for commanding, the ECS elements used for connecting those workstation with the SMOCC, and the interface with the SMOCC) from unauthorized access from the public elements of the LAN (i.e., those elements connected to public networks). This interface will nonetheless allow data transfers from public LAN elements to secure IWSs when initiated by the latter, as required for planning, particularly in near real-time.
The EOF LAN will support all protocols required to interface the EOF to GSFC support facilities and remote investigator institutions.
The EOF LAN will be compatible with the LAN used to conduct SOHO spacecraft AIV (Assembly-Integration-Verification) tests at the spacecraft integrations contractor's facility. The EOF LAN will have the capability to receive SOHO real-time telemetry (formats VC0, VC1, VC2). The ECS does not accept VC4 (tape recorder playback) telemetry. Those data come from the GSFC Information Processing Division (IPD) as a quicklook file.
The EOF LAN will have the capability to interface with the SMOCC for instrument command loads, real-time instrument commands, DSN schedules, and command history files.
The EOF LAN will interface with the GSFC Centerwide LAN, through which the EOF resident workstations will be able to access and utilize existing GSFC facilities such as the ISTP CDHF, supercomputing facilities, and mass storage facilities.
The EOF LAN will be capable of network access to the following: