CHAPTER 5 SYSTEMS: COMMAND AND DATA HANDLING—THE BRAINS OF THE INTERNATIONAL SPACE STATION 96 Table 1. (continued) TIER 3 Connected to Internal Multiplexer/DeMultiplexer Node 1 (N1) • Two partially redundant MDMs • Both powered on • One operating as Primary, one as Secondary • Located on PMA-1 • Also an connected to C&C MDM • Node 1 monitor and control: fire detection and isolation • RPCM control • Heater control, cabin pressure monitoring • Control CBM • Recovery of USOS command and control interface (Mighty Mouse) Laboratory-1 • Located internal to US Lab • Smoke detector monitoring, Common Cabin Air Assembly (CCAA) control, InterModule Ventilation (IMV) control • Low Temperature Loop (LTL) temperature control, Loop Crossover Assembly (LCA) valve control, rack flow control • Rack power switch monitoring Laboratory-2 • Located internal to US Lab • Smoke detector monitoring, CCAA control, IMV control • Moderate Temperature Loop (MTL) temperature control, LCA valve control, rack flow control • Rack power switch monitoring • Lab Caution & Warning (C&W) panel control Laboratory-3 • Located internal to US Lab • Air revitalization, vacuum system control • ITCS rack flow control • Rack power switch monitoring Airlock • Located internal to Airlock • Airlock smoke detector monitoring, CCAA, IMV control, depress pump control, Battery Charger Assembly, Umbilical Interface Assembly Node 2 (N2) • Located internal to Node 2 • Node 2 smoke detector monitoring, CCAA, pressure monitoring, IMV control • Node 2 control and monitoring • Rack power switch monitoring • Node 2 C&W panel control (N2-2 MDM) • Japanese Experiment Module C&W panel control (N2-1 MDM) Connected to External Multiplexer/DeMultiplexer S0-1, S0-2 • Two partially redundant MDMs • Both powered on • Operating as bus controller (BC) on different buses • Located on S0 Truss • Structural Dynamic Measurement System • Heat exchanger control, some External Thermal Control System monitoring and Failure Detection, Isolation, and Recovery • S0 RPCM control S1-1, S1-2, P1- 1, P1-2 • Two partially redundant MDMs • Both powered on • Operating as BC on different buses • Located on S1/P1 Truss • Thermal Radiator Rotary Joint control, S1-1/P1-2 MDMs provide primary External Thermal Control System insight, S1-2/P1-1 MDMs provide External Thermal Control System pump commanding • S1/P1 RPCM control, S1 MDMs control RPCMs for S1 and Starboard Thermal Radiator MDMs, P1 MDMs control RPCM for P1 MDMs S3-1, S3-2, P3-1, P3-2 • Two partially redundant MDMs • Both powered on • Operating as BC on different buses • Located on S3/P3 Truss • Solar Array Rotary Joint control, S3/P3 RPCM control, S3 MDMs controls RPCMs for S3 MDMs, P3 MDMs controls RPCMs for P3 MDMs Starboard Thermal Radiator, Port Thermal Radiator • Located on S1/P1 Truss • Radiator beam insight and commanding (continued next page)