Operational Interface Procedures for the South Pole TDRSS Relay ...

test events and schedules utilization of the NCC computer resources and receives
STDN support requests to schedule network testing.
d. Performance Analysts. The PA positions in the NCC are responsible for monitoring realtime
support performance, validating performance standards, and assisting in rapid failure
identification and restoration of services. The PA also is responsible for post-event
problem analysis, receipt, and tracking of all Service Level Reports (SLR) and Equipment
Status reports (ESR); conducting routine TDRSS tests; configuration of voice lines for
use during playback; and acting as assistant to the TM assuming the TM’s responsibilities
in the OCR during TM absences. The PAs are assigned to TDE and TDW. TDRS-
Spare support also is conducted by the TDRS West PA. Additionally, the PA assumes
the Acq-Track responsibilities when the ACQ-Track position is unmanned.
2.4 Space Network
2.4.1 General
The SN is a National Aeronautical and Space Administration (NASA) resource consisting of
automated space and ground segments that function interactively to provide services for SN
customers. The SN provides Ku-band Single Access (KSA), S-band Single Access (SSA), and Sband
Multiple Access (MA) forward, return and tracking telecommunications services between
low earth orbiting customer spacecraft and ground-based control and data processing facilities.
2.4.2 Space Segment
The space segment of the SN consists of a constellation of geostationary TDRSs. The TDRS
constellation comprises of the TDRS-East (TDE), TDRS-West (TDW), and TDRS-Spare (TDS)
spacecraft. The stored spare space crafts are not used for testing or other customer services
without the specific approval of the GSFC Networks and Mission Service Projects (Code 450).
In case of a catastrophic failure of TDE, TDW or TDS, a stored spare may be moved into
position to replace either of them.
NOTE
One of the stored spare spacecraft has been designated as the
TDRS-Zone of Exclusion and has been approved to provide
services for specific customers via the GRO Remote Terminal
System (GRTS).
2.4.3 Ground Segment
a. The ground segment of the SN is located near Las Cruces, New Mexico, and consists of
two primary ground terminals (WSGT and STGT). The SPTR system uses the WSGT
and STGT ground terminals herein referred to as the White Sands Complex (WSC).
b. The ground segment also provides communications interfaces using the common carrier
Domestic Satellites (Domsat) earth stations and NASA Integrated Services Network
(NISN). The ground segment provides limited data protection services such as data
quality monitoring, line outage recording, and fault isolation.
a2302s2 2-3 532-OIP-NCC/SPTR