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20 C1640M-B (3/06)
Examples of Worse-Case Bandwidth Calculation in Playback Mode
Example 1: WS5050 Endura Workstation—Playback Video Stream
Each WS5050 can display 16 simultaneous playback streams.
To calculate the worse-case bandwidth for the WS5050:
1. Find the bandwidth.
B
W
= N
S
x B
R
= 16 x 2 Mbps = 32 Mbps
2. Find the overhead.
O
H
= 25% x B
W
= 16 x 2 Mbps x 25% = 8 Mbps
3. Find the worse-case bandwidth.
B
WC
= (N
S
x B
R
) + O
H
= 32 Mbps + 8 Mbps = 40 Mbps
Example 2: VCD5000 Video Console Display—Playback Video Stream
The Model VCD5001 has one monitor output and can display up to 16 simultaneous playback streams. A Model VCD5004 has four monitor
outputs and can display 64 simultaneous playback streams.
To calculate the worse-case bandwidth for the VCD5004:
1. Find the bandwidth.
B
W
= N
S
x B
R
= 64 x 2 Mbps = 128 Mbps
2. Find the overhead.
O
H
= 25% x B
W
= 64 x 2 Mbps x 25% = 32 Mbps
3. Find the worse-case bandwidth.
B
WC
= (N
S
x B
R
) + O
H
= 128 Mbps + 32 Mbps = 160 Mbps
Example 3: NET5301R Decoder—Playback Video Stream
Each NET5301R decoder can playback 4 simultaneous video streams.
To calculate the worse-case bandwidth for the NET5301R decoder:
1. Find the bandwidth.
B
W
= N
S
x B
R
= 4 x 2 Mbps = 8 Mbps
2. Find the overhead.
O
H
= 25% x B
W
= 4 x 2 Mbps x 25% = 2 Mbps
3. Find the worse-case bandwidth.
B
WC
= (N
S
x B
R
) + O
H
= 8 Mbps + 2 Mbps = 10 Mbps
NOTE: For the examples below, assume that all recorded video is at 4CIF (2 Mbps) at 30 IPS:
• In this case, if playback video is displayed in the single layout mode, then the display rate is at 30 IPS.
• However, if playback video is displayed in 4 x 4 layout mode, the display rate is at 2 IPS. In this case, the bandwidth is still 2 Mbps.