| 摘要 |
A general hierarchical model (Figure 4) represents functions and capabilities of a network of devices in a uniform standardized format. Objects are used to represent devices, subdevices, supported media, installed media and available services. Network devices are included within a unit object list, including corresponding unit object descriptors. For devices having subunits, the unit object descriptor is associated with a subunit object list, including corresponding subunit object descriptors. Object lists (list 0 - list 3) associated with each subunit object descriptor include a supported media object list representing media types supported by the subunit and an installed media object list representing information available on the media within the subunit. For subunits capable of providing services, the subunit object descriptor has an associated object list representing the services available through the subunit. The uniform standardized format allows two devices coupled together within a IEEE 1394-1995 serial bus network to exchange information including their respective object lists and entries.
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