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Configuring ESCON Channels

ESCON Channel Configuration Information

Table 20 lists all configuration items, what each item is used for, and the allowable value options for each item. The factory-set default values are underlined.

Table 20. ESCON Channel Attachment Items
Configuration Item Description Value Options
ESCON Link A Installed Specifies if ESCON Channel Link A is installed. Yes or No
ESCON Link B Installed Specifies if ESCON Channel Link B is installed. Yes or No
Device Address Specifies the 2-digit hexadecimal channel address which includes the device address.
Notes:
  1. In simplex mode, only one device address is required.
  2. In dual simplex mode, each printer requires a unique device address. Printer 1 requires an even number (for example, X'30'); Printer 2 requires the next consecutive number (for example, X'31').
  3. The duplex system does not require a unique number. It can use either of the addresses used for dual simplex Printer 1 or dual simplex Printer 2. However, it is often easier from an operational viewpoint to assign duplex a separate address (so the duplex and simplex printers look like unique devices to the operating system). The general convention in this case is to assign the duplex system the next consecutive address (even) after the address for simplex Printer 2.

    For example, if you define Printer 1 in dual simplex as X'30', you should then define Printer 2 in dual simplex as X'31', and, optionally, define the complete system in duplex as X'32'.

  4. The device addresses specified above must match the device addresses defined to the host PSF software, and in the case of S/390 hosts, the I/O device definitions.
 00 to FF (Hexadecimal notation). Default is X'00'
Multi-host environment flag Shows whether a multiple host printer-sharing system exists. If this environment flag is set, all hosts are required to use the assign/unassign protocols of the attachment architecture.

Do not enable this flag unless all the hosts sharing the printer have the following:

  • OS/390 V1 Release 3.0 or higher
  • PSF ASSIGN/UNASSIGN support (PSF 3.1.0 for OS/390 or APAR OW29992 to PSF/MVS 2.2)
 True or False
Card 1 Slot Position The printer sets this entry automatically at power on time if the system senses the presence of an ESCON Channel card. This item is not selectable.
  • 2 or 4 or Not Installed (for Model ES1)
  • 6 or 8 or Not Installed (for Models ED1/ED2)
Card 2 Slot Position The printer sets this entry automatically at power on time if the system senses the presence of an ESCON Channel card. This item is not selectable.
  • 2 or 4 or Not Installed (for Model ES1)
  • 6 or 8 or Not Installed (for Models ED1/ED2)