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Chapter 11
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Figure 11-1 QoS - Endpoint Mapping
PHDC does not define a protocol for data and messaging. It is only intended to be used as
a communication layer. Developers can use either data and messaging protocol defined in
ISO/IEEE 11073-20601 base protocol or a vendor-defined protocol. Figure 11-2 shows the
different software layers needed in a personal healthcare device.
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Figure 11-2 Personal Healthcare Device Software Layers
Since transfers having different QoS will have to share a single bulk endpoint, host and
device need a way to inform each other what is the QoS of the current transfer. A metadata
message preamble will then be sent before a single or a group of regular data transfers. This
preamble will contain the information listed in Table 11-3.
186
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