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Both internal and external communication links are provided in the TSC to enable the user to monitor mission operations and utilize commercial phone services.

Digital Voice Intercommunications System (DVIS)

Voice loops are configured on DVIS keyset panels mounted at the TSC consoles to communicate with PIs located at remote sites, other TSC users, the POIC, and the ISS crew (when authorized). Each DVIS keyset has 10 pages available for voice loop configurations, with 24 loops per page capability. Up to 24 voice loops can be active concurrently in the listen/monitor mode. The user can select up to 24 voice loops for simultaneous monitoring and select talk/monitor capability only on one loop, which inhibits all other talk/monitor selections.

Voice loops extend from the MCC-H provide mission-wide communications for payload operations. The specific voice loops required are mission dependent and must be defined in the Payload Integration Plan (including Annexes) with the concurrence of the appropriate loop “owner” (i.e., the responsible organization).

The TSC can monitor the S/G and A/G loops continuously, but TSC users may talk on these loops only if authorized. The talk capability is not automatic - this capability must be requested during the mission planning process and, if authorized, the TSC Operations Manager must enable the user’s keyset.

S/G and A/G voice loops are continuously recorded. However, because the recording capability uses shared resources, its use may be limited by operational constraints. Procedures for obtaining voice loop recording and playback services are provided prior to the applicable mission.


Video monitors in the TSC are provided to display payload experiment activities. Real-time and playback ISS video is provided to the TSC from the imagery center in JSC Building 8. Video to remote PI teams will be accomplished via restricted commercial data lines.

NASA SELECT video can be utilized in the TSC for viewing downlink television from experiment activities. NASA SELECT, a TV service center at NASA, receives video from the ISS, color-codes, and distributes this video to the TSC where it is distributed to TSC user monitors. Real-time TV is normally downlinked with interleaved voice. Recorded TV that is downlinked does not contain voice; voice is interleaved on the ground prior to playback.

Video Switching

JSC Building 8 processes and forwards the video signal to Building 30. A switch controller selectively distributes these signals to the TSC switch controller, where the signals are distributed to PI workstation monitors.

Video Recording

JSC Building 8 maintains a recording of both AOS and LOS mission video and provides copies of this video as requested by the JSC TSC Manager.

The TSC records live mission video for in-house use. This video can easily be replayed to the TSC video monitors based on PIs' needs.

Standard Television Monitoring

The system receives standard NTSC television via three direct lines from TV Control in Bldg. 8. Video camera outlets in the ISS training facilities provide monitoring capability for science verification integrated crew training and mission integrated simulation. The TSC flight configuration includes video recording and playback capability. Payload experiment video is highly desirable to provide PIs and TSC staff personnel optimum visibility into payload experiment operations. All onboard video cameras are ground selectable with split screen display capability if required.

The JSC TV Facility records all downlinked TV data. These data are recorded in raw or computer enhanced form. There are only three recorder systems available. One is used for real-time recording, one for playback, and another for back up of real-time recording. The TSC has the capability of displaying real-time or playback video as transmitted by the JSC TV Facility. The TV playback can be requested by submitting a Flight Note to the TSC Operations Manager specifying the MET and subject matter of the desired playback. The Operations Manager coordinates the requested playback and notifies the requester and all other TSC workstation positions of the scheduled time of the playback. The Operations Manager configures the video distribution so that TSC positions can view the playback at their workstations.


The TSC maintains MET and GMT for all ISS increments. The capability to synchronize data with real-time time that is downlinked real-time with ground data systems is supported.