IBM 3000 Parallel Channel Conguration Information, Conguration Item Description Value Options

Parallel Channel Con®guration Information

Table 17 lists all con®guration items, the purpose of each item, and the allowable value options for each item. The factory-set default values are underlined.

Table 17. Parallel Channel Attachment Items

Con®guration Item	Description	Value Options
Parallel Link A	Speci®es if Parallel Channel Link A is installed.	Yes or No
Installed
Parallel Link B	Speci®es if Parallel Channel Link B is installed.	Yes or No
Installed
Device Address	Speci®es the 2-digit hexadecimal channel address which	00 to FF (Hexadecimal notation).
	includes the device address.	Default is X©00©

	Notes:
	1. In simplex mode, only one device address is required.
	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©).
	2. 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 de®ne Printer 1 in dual simplex
	as X©30©, you should then de®ne Printer 2 in dual
	simplex as X©31©, and, optionally, de®ne the complete
	system in duplex as X©32©.
	3. The device addresses speci®ed above must match the
	device addresses de®ned to the host PSF software,
	and in the case of S/390 hosts, the I/O device
	de®nitions.
Second Channel	Speci®es the switching mode of the Two-Channel Switch: Static or Dynamic
	Static or Dynamic Mode. When a second Parallel Channel
	is installed, a Two-Channel Switch facility is provided.
	v Static: You can enable only one channel at a time. You
	can connect two interfaces to two channels on the same
	processing unit, on tightly coupled processing units
	(units controlled by the same operating system), or on
	independent (uncoupled) processing units.
	v Dynamic: You can enable both channels at the same
	time with the two-Channel Switch used as a dynamic
	interface switch. Connect the two interfaces to two
	channels either on the same processing unit or on
	tightly-coupled processing units (units controlled by
	the same operating system).
	You cannot select this item unless two channels are
	installed.

232InfoPrint 3000 Operator's Guide