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.
BW = NS x BR = 16 x 2 Mbps = 32 Mbps
2. Find the overhead.
OH = 25% x BW = 16 x 2 Mbps x 25% = 8 Mbps
3. Find the worse-case bandwidth.
BWC = (NS x BR) + OH = 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.
BW = NS x BR = 64 x 2 Mbps = 128 Mbps
2. Find the overhead.
OH = 25% x BW = 64 x 2 Mbps x 25% = 32 Mbps
3. Find the worse-case bandwidth.
BWC = (NS x BR) + OH = 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.
BW = NS x BR = 4 x 2 Mbps = 8 Mbps
2. Find the overhead.
OH = 25% x BW = 4 x 2 Mbps x 25% = 2 Mbps
3. Find the worse-case bandwidth.
BWC = (NS x BR) + OH = 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.