USB Bandwith Analysis

Universal Serial Bus (USB) is a new personal computer (PC) interconnect that can support simultaneous attachment of multiple devices. Developers of USB devices have initially had concerns about guaranteed throughput performance compared to previous popular single device PC connections such as RS232 serial ports or Centronics parallel ports. This paper presents a simple detailed analysis of USB throughput characteristics. That analysis is then used to model several examples of single USB device throughput requirements and a range of representative multiple device USB configurations. These examples demonstrate the broad range of potential USB devices that might possibly be implemented and expected to reliably work when added to an existing USB configuration. The reader is assumed to be familiar with the USB system architecture.

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