IBM 3708 Description page 203

Printer Authorization Matrix
Printer Mode
Printer Classes
The 3708 printer authorization matrix defines how displays use printers attached to
the same 3708. When a 3708 port is configured for attachment to a printer or a
display-with-printer, one entry of the matrix is defined. The entry defines the
operating characteristics of the printer attached to the port. The matrix is used to
perform the following actions:
• Establish Printer Mode. A printer can be reserved for exclusive use of either the
host or the local copy function. A third mode allows sharing between these two
functions.
• Assign Print Classes. A print class is a way of grouping printers for use by local
copy. Output is directed to the first available printer in a class.
• Define Source Device Lists. The source device list for a specific printer specifies
which displays can use the printer.
A printer may be in one of three modes, specified in the printer authorization matrix
as local, system, or shared mode. Printers that are specified as being in local mode
or shared mode are available for local copy use.
Local Mode:
A printer in local mode is used for local copy functions only. In local
mode, displays may contend for use of the printer, but the host may not. The
printer is not available for direct print operations from the host.
When a printer is set for local mode, an LV type 1 (SCS) or 3 (DSC) BIND request
from the host is rejected with a negative response of X' 0801' (printer not assigned).
System mode:
A printer in system mode is entirely under host control. The printer
cannot be used for operator-initiated or host-initiated copy operations.
Shared Mode:
In shared mode, both host-directed printing operations and local
copy operations are permitted on the same printer. The 3708 provides Between
Bracket Printer Sharing for this type of printer. Local copy requests may be sent to
the printer when it is not in session with a host application, or when it is in session,
but not in brackets.
The printer authorization matrix provides the ability to assign a printer to a class.
The definition of a class of printers is determined by the customer environment. A
class may be based on type, location, or other characteristic. For example, class 72
might be defined as all printers with yellow paper. Thus, an operator may select a
printer on the basis of characteristics, rather than printer port address. When more
than one printer is assigned to a class, copy output can be improved.
The matrix allows 16 classes with class numbers 70 through 85 to be defined. A
display operator would select a printer by class by using the IDENT key sequence
and entering the class number. With this type of operation, the 3708 selects which
printer in the class to send the display image. A single printer may be in one or
several classes, or not in any class. Several printers may be members of a single
class.
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IBM 3708 Description