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Real-time
Data Acquisition, Storage, and Reconstruction
The OLD Paradigm: TDM/STORAGE
Time Division Multiplexer directly feeds attached storage
(tape, disk, or solid state memory):
w Limited real-time storage bandwidth: 250 –500
Mbps
w Limited real-time multiplexer bandwidth: 250 –
500 Mbps
w Limited number of high-speed input channels: 8
– 16
w Poor Bandwidth Utilization with combined
high-speed and low-speed channels
w Limited storage Capacity < 500 – 1000
Gbytes
w Poor Storage Capacity Utilization with combined
high-speed and low-speed channels
TDM/STORAGE CAN NOT ADDRESS CURRENT and EMERGING
REQUIREMENTS:
w 1500 Mbps - 3000 Mbps (Current),
w 5000 - 40,000 Mbps (Emerging)
w 10 – 100 TB capacity or more
w random access, simultaneous read/write
w 2x , 4x, 8x and faster high-speed playback
w 10s to 1000s of channels, wide range of data
rates
w widely-distributed sensor locations
w centralized configuration, control,
provisioning, monitoring
The NEW Paradigm: Real-Time Data Acquisition Network ("RTDAN"
)
Network-connected data acquisition nodes and storage nodes:
w Ultra-High-Bandwidth Switched Fabric
w Unlimited Scalability in Bandwidth, Capacity,
and number of nodes (i.e. channels) :
w Ability to Stripe across multiple storage nodes
w Synchronization
across node
w File-based
multiplexing
w ATM-cell
based multiplexing for true space-time division multiplexing (Phase
II)
w Centralized Operation, Administration, and
Maintenance (OAM)
w Supports Widely-distributed network elements
w Outstanding bandwidth utilization efficiency
w Outstanding Capacity utilization efficiency
Enabling Network Element: ASC Packet Assembler/Dis-Assembler/Network
Interface (PAD/NI )
w PAD/NI –200: max 1360 Mbps per node, 2 x
1 Gbps FibreChannel
w PAD/NI – 400: max 2720 Mbps per node, 2
x 2 Gbps FibreChannel
w PAD/NI – 800: max 5440 Mbps per node, 4
x 2 Gbps FibreChannel
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