ZyXEL Communications HES-309M, Руководство пользователя, Страница: 117 / 246

Chapter 9 Maintenance
HES-309M Series User’s Guide
117
OMA-DM Data Model
Each device that conforms to the current OMA-DM standard has an identical data
structure embedded in its controlling firmware. This allows a similarly conforming
OMA-DM server to navigate the folder structure and to make file alterations where
appropriate or required.
Figure 50 OMA-DM Data Model
In the example data model shown here, the parent folders must conform to the
OMA-DM standard. The child folders, on the other hand, can be customized on an
individual basis. This allows the parent folders to all maintain a consistent URI
(Uniform Resource Indentifier) across all devices that meet the OMA-DM
standard’s requirements.
For example, in the preceding figure the URI for the “Games” folder is “./Vendor/
Games/”. The “./Vendor/” portion of the URI exists on all devices that conform to
the OMA-DM standard. The “Games” folder, however, may or may not exist
depending on the services provided by the company managing the device.
Daytime
A network protocol used by devices for debugging and time measurement. A
computer can use this protocol to set its internal clock but only if it knows in which
order the year, month, and day are returned by the server. Not all servers use the
same format.
Time
A network protocol for retrieving the current time from a server. The computer
issuing the command compares the time on its clock to the information returned
by the server, adjusts itself automatically for time zone differences, then
calculates the difference and corrects itself if there has been any temporal drift.
Root Folder
./
DMAcc
Vendor
Operator
MP3s
Games