HP Web Jetadmin Software Manuel d'utilisateur Page 182

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IP Hostname: The IP hostname is displayed if the operating system can resolve an IP address to a
hostname from a name server such as DNS or WINS using a GetHostByAddr call. System Name, which can
be the hostname if the NIC registers it with a name server, is displayed if the device answers the sysName
MIB2 object.
Model: The printer model name is displayed according to the response to hrDeviceDescr.
Serial Number: The serial number is a unique manufacturing identier for the device. The serial number is a
critical identier item that HP Web Jetadmin uses to determine the uniqueness of a device along with other
items such as the MAC address and IP address. Some functionality, such as Reports, is blocked in
HP Web Jetadmin if the serial number cannot be obtained. Therefore, HP Web Jetadmin makes a strong
eort to obtain the serial number from third-party devices. The most typical and widely supported object
to extract for obtaining the serial number is prtGeneralSerialNumber.
Status: Device status, which indicates the current state of the printer (for example, online or paper jam), is
displayed based on responses to standard objects such as hrPrinterDetectedErrorState.
System Contact: The system contact is displayed from the response to sysContact.
Storage: The presence of storage media such as a hard disk, ash disk, RAM disk, and installed RAM can be
detected using hrDiskStorage objects. Additional storage information is provided on the Storage tab for
certied devices.
Remaining Input Tray Levels: The approximate amount of paper remaining in a particular tray can be
displayed by calculating a percentage based on responses to the Standard MIB objects
prtInputCurrentLevel and prtInputMaxCapacity.
Remaining Toner Levels: The approximate amount of toner or ink remaining in the cartridge cavity is
determined by calculating a percentage based on prtMarkerSuppliesLevel and
prtMarkerSuppliesMaxCapacity.
Reports: Basic support includes only the Device Inventory report. Advanced support may include reports
that make use of the various supported page count values, such as Accessories Inventory (capabilities),
Supply Utilization (marker supply information), Device Utilization (page counters), and Hourly Peak Usage
(hourly page counters).
Troubleshooting
Determining why a particular non-HP device supports the features that it does is usually a result of the device's
ability to answer the queries HP Web Jetadmin sends. Certied devices have known objects written in their
device plug-ins and those objects have already been tested, so issues rarely occur on those devices. However,
for qualied devices and those requiring basic support, HP Web Jetadmin is dependent on the device to answer
industry-standard queries. Some devices support more gauges than others. You cannot always assume that all
devices from a particular vendor support the same features. For example, one Xerox model may support the
control panel display, while another Xerox model does not. The following are common explanations for why
particular items may not appear for devices.
Issue Resolution
A gauge may be present for a consumable, but the gauge is hashed
out instead of containing a remaining percentage.
If a devices answers prtMarkerSuppliesDescription correctly, the
gauge is present because HP Web Jetadmin knows the consumable
exists. However, if the device cannot answer either
prtMarkerSuppliesMaxCapacity or prtMarkerSuppliesLevel correctly,
the percentage cannot be calculated and HP Web Jetadmin displays
hashes instead to indicate an unknown level.
A paper tray gauge does not indicate a remaining percentage. While a device answers the prtInputType query to indicate a tray is
present, the device may respond to the prtInputMaxCapacity and
156 Chapter 3 Device Management ENWW
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