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DMC 203 Command & Data Handling (Caution & Warning ( Emergency…
DMC 203 Command & Data Handling
Functions
Collect data
Process data
Distribute commands
Components
PL network
Data buses
MDM's
MDM's
Enhanced
Comprised of Orbital Replacement Units :
EPIC card
Data card
MSD
HRDL card
Power supply card
CCMDM
2-fault tolerant
Warm backup
Cold backup (off)
Retrieves commands (LRDL)
Downlinks C&W, CVT (MRDL)
ZOE via HRDL
Time tagged buffer
Connects to C&T
Connects to COL and JEM modules
PLMDM
Single-fault tolerance
Receives commands from CCMDM
Controls APS/PEHG, Payload network
Collects H&S data, low rate telemetry from PL Support System
Connects to US Orbital Segment modules
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Standard
Tier 3 (user)
No EPIC card or HRDL card
Interface to sensors and effectors
Payload Network
APS
HRDL
GIG-E connections to KCU
Commanded through CCMDM and PLMDM
PEHG
2 in LAB, 1 in COL
MRDL
Commanded through CCMDM and PLMDM
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Payload MDM Services
Health and Status
CCSDS packets carry service requests
H&S is the only payload data that is stored in the CVT
APID 876 is down-linked through the HRDL link
Low Rate Telemetry
Not pulled into the CVT
Requested via H&S response
Payloads send LRT to the PL MDM for Downlink
File Transfer
Files are uplinked via S-Band
PDs use File Ground Management Tool via S-Band
Requested by H&S response or manual PRO commanding
Ancillary Data
Broadcast Ancillary Data (BAD)
Payload Ancillary Data (PAD)
Requested via H&S response or manual PRO commanding
Ku-Band HRDL Profiles
Profiles are used to instruct the PL MDM what data to pull out of the CVT for downlink
Portable Computer System
Crew interface to PL and support systems
Interfaces to USOS
Commands via 1553 and LAN
Carries PL H&S, PL ancillary data, C&W, procedures
Caution & Warning
Emergency
Fire, depress, toxic atm.
Warning
Time critical hardware/software failure
Caution
Non-time critical problem that could escalate to level 2.
Advisory
System status
Robotic Advisory
Robotic system status