HP Web Jetadmin Software Instrukcja Użytkownika Pobierz pdf (Strona 2)

OVERVIEW

Administrators want the ability to discover all the printing devices that are in use in order to evaluate

their entire device inventory and move toward a balanced deployment. Devices that are directly

connected to client machines on the network via USB and parallel (LPT) connections have always

proven troublesome because it typically involves a physical inventory to locate them. Fortunately,

HP Web Jetadmin provides two separate techniques for remotely discovering PC-connected devices

that eliminate the need for physical inventories. One technique involves no client software, but can

discover only the device model names, which might be useful for quickly determining inventory. The

other technique involves installing client software, but can fully manage the devices by gathering

many additional details beyond the model name.

PROXY AGENTS vs. WMI

HP Web Jetadmin provides the following methods for discovering devices directly connected to client

machines:

• Windows

Management Instrumentation (WMI)

• Proxy agents (HP SNMP Proxy Agent and HP WS Pro Proxy Agent)

WMI is a set of extensions to the Windows Driver Model that provides an operating system interface

through which instrumented components provide information and notifications. If administrator

credentials are provided, HP Web Jetadmin can use WMI calls to discover directly connected

devices. WMI calls can extract the plug-and-play ID of any directly connected device from the

registry. WMI must be installed on all workstations. Administrator rights are required on the

workstations to make the WMI calls. However, the only information about the device that WMI

extracts is the model name. Discovered devices appear in the All Devices list along with the

networked devices, but are distinguishable in the Port column as either LPTx or USBxxx.

The proxy agents are client-side software that allow HP Web Jetadmin to discover and manage

directly connected devices. HP SNMP Proxy Agent works by exposing printer management

information base (MIB) object identifiers (OIDs) to the Microsoft

SNMP service running on the client.

HP WS Pro Proxy Agent is a WCF service running as a Network Service that resides on a PC

workstation and replicates a device’s services from the host computer’s USB interface to its network

interface. While most devices support HP SNMP Proxy Agent, a few require HP WS Pro Proxy Agent.

Discovered devices appear in the All Devices list along with the networked devices, but are

distinguishable in the Port column as PC Port. The client software is capable of passing the same types

of questions to PC-connected devices that are typically passed to network-connected devices.

Therefore, additional device information can be gathered, such as remaining toner levels, page

counts, and status.

Comparison matrix

Proxy agents

WMI

Credentials

Admin rights are required to install the agent on

the client machines, but not to run discoveries.

Admin rights are required on all client machines

to successfully discover PC-connected devices

using WMI calls.

Client machines

The proxy agent must be installed on all client

machines. The SNMP service must be active on

client machines for the SNMP proxy.

WMI must be active on client machines.

Performance

Discoveries are much faster using simple SNMP

requests or Web Services.

Discoveries that use WMI calls are slower.

Discoveries

Normal HP Web Jetadmin network device

discovery techniques are used.

Normal HP Web Jetadmin network device

discovery techniques are used.

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