2.4.2 Intrastation Communications
- Voice links that provide both frontline and backline communications
between KTS and STC controller personnel during satellite operations. During
nonoperational periods, the voice links shall be capable of interfacing with
the intrastation administration telephone system.
- Full duplex, secure,
100-WPM teletype links for operational and administrative communications.
Intrastation communications facilities shall include:
- A telephone system for administrative communications within the station.
- An operational voice communications system providing party line
communications between selected station operating personnel during system
checkout, operations and maintenance actives. (In addition, facilities shall
be provided to terminate the analog frontline or other voice circuits in
selected communications panels)
- A public address system, accessed from
the telephone operator position and from the station operator's console.
- Voice recording facilities to record the front-line and the operational voice
The timing subsystem will incorporate a precision atomic time base for
coordination of satellite support functions; time labeling of tracking,
telemetry, and command data; and equipment synchronization.
Satellite support coordination and all time labeling functions shall be referenced to a
system time showing elapsed time from 00:00 Greenwich Mean Time. Timing
functions shall include:
- Coordination. Time displays provided at
operating positions shall show elapsed time, both in total seconds and in
hours, minutes, and seconds.
- Time labels: Time labels shall be provided
for processed data and recorded data at the computer.
- Processed Data.
The processed tracking, telemetry, and command data shall be labeled with
- Recorded Data.
The following three formats shall be selectable
for time labeling of recorded data:
(a) The Irig-B format
(b) The Irig-C format
(c) The STCW (system time code word), which is a 17-bit binary
representation of system time in total seconds.
- Synchronization. Bit rates
shall be provided as required for equipment synchronization.
Station Test Programs (STP) shall be available to test and verify the
capability of the station to perform the primary functions of satellite
tracking, telemetry readout, and commanding. The STP shall use a series of
"expanding loop" tests to accomplish the following four basic functions:
Simulation and checkout functions shall also include:
- Verification of the data and display and control subsystems
- Isolation of faults to major equipment levels
- Provision of alarms to indicate out-of-tolorance conditions
- Verification of overall station performance.
- Boresighting of the TT&C and the 200 MHz Autotracker antennas
- Simulation of uplink services, ranging and commands
- Simulation of
downlink services, analog data, FM/FM-PAM/FM telemetry, plain text or
encrypted PCM telemetry, and ranging.