Dell Wyse Enhanced Ubuntu Linux T50 Manual de usuario descargar pdf (Pagina 35)

Chapter 5. Printer Features

• After a print job is completed, the application must close the port. As the emulation is unaware of the

printer protocol, closing the port is the only way it can determine where one job ends and another

begins.

To access the emulated parallel port, conﬁgure the application to use the port

$TLSESSIONDATA/dev/lp0.

5.4. Nearest printer support

With the ThinLinc nearest printer feature, printer jobs are routed to a printer near the terminal the user is

currently sitting at. This is accomplished by matching printers to hardware addresses of terminals.

The nearest printer is implemented as an extra printer queue, above the real printers. Printer jobs sent to

the nearest queue will be sent to the nearest printer backend. The backend is a program which is called

by CUPS together with all needed information. The nearest backend will look at the user name handled

by CUPS and then ask the ThinLinc VSM server for more information about this user. The information

tells the backend which terminal the user is currently using. It then queries the information stored in

Hiveconf for a list of printers close to the terminal used by the printing user. When a printer is known the

backend will reprint the job to this printer.

This queue is added to the VSM master server by tl-setup at installation of ThinLinc. The recommended

setup is to conﬁgure one nearest printer queue in the CUPS daemon on the VSM Server host, and then let

all agents use this CUPS daemon. See Section 5.2 for an overview of printer setup in a ThinLinc cluster.

5.4.1. Administration of the Nearest Printer Feature in ThinLinc

To be able to work properly the nearest printer system needs information about physical layout. The

information is divided into three sections, printers, locations and terminals. This information can be

administrated using the ThinLinc Web Administration.

Each printer that should be handled by the nearest printer system should be entered with a name and an

optional comment. The button Fetch printers from CUPS can be used to fetch the current list of

printers from CUPS. Please note that printers that are removed from CUPS must be manually removed

from the list of printers in tlwebadm.

Each location with terminals should be entered with a name, an optional comment and a list of local

printers. A location can for example be a classroom, a department, a house, and so on. The possible

printers are the ones entered in the printer interface.

For each terminal entered in this system you enter the terminal network interface hardware (MAC)

address and the location the terminal resides in. The hardware address can be entered in many formats,

but will be converted to all uppercase hexadecimal form separated by colon, i.e. "01:23:45:67:89:AB".

You can explicitly add printers to the terminal settings, which then gets higher priority than the printers

deﬁned at the terminal’s location. This can be handy if a terminal has a local printer connected to it,

perhaps in a large room where the other printers are far away.

Normally you will ﬁrst enter all printers, then all locations and ﬁnally all terminals in the system. To

each location you can add a list of printers near that location. If the location is so big that different

printers are close to different parts of the location, then you should probably divide the location into

smaller parts. You can also assign close printers to a terminal. This can be used in cases where a terminal

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