An IBM SNA network function allowing corresponding LUs to exchange information. As SNA has developed, new types of Logical Units have been introduced that support a broader range of communications facilities. LU6.2, for example, provides peer-to-peer communication (as opposed to via a central mainframe).
A port through which a user gains access to the services of a network.
A physical or virtual peripheral device, such as a DVD-ROM drive.
A program or a set of programs within a node that provides access to an SNA network for an end user. A Logical Unit can support two types of sessions: LU-to-SSCP sessions and LU-LU sessions.
In SNA, one of three types of network addressable units that serve as a port through which a user accesses the communications network. The other two include physical unit (PU) and system services control point (SSCP).
(LU) - A SCSI object that processes IO commands sent by a host. Both Network-Volumes and array volumes are logical units.
A virtual device addressable through a target SCSI device. A physical SCSI device can have more than one logical unit. Logical unit are supported only by SCSI targets.
The SNA entity through which application data is transmitted within an SNA network. Logical Units are the ports through which end users have access to the network (see end user). They format message units, display information, and handle error recovery. There can be multiple LUs in an SNA node.
A subdivision, either logical or physical, of a SCSI device. Most devices have only one logical unit, but up to sixteen are allowed for a 16-bit SCSI bus and eight for an 8-bit SCSI bus.
an entity residing in the SCSI target device that implements a device model and processes SCSI commands sent by an application client
In SNA, a port through which an end user accesses the SNA network in order to communicate with another end user and through which the end user accesses the functions provided by system services control points (SSCP). An LU can support at least two sessions, one with an SSCP and one with another LU, and may be capable of supporting many sessions with other logical units. See network addressable unit, primary logical unit, secondary logical unit.
An IBM SNA network function defined in layers four, five and six (Transmission Control, Data Flow Control and Presentation Services) of the SNA architecture. In the SNA network, corresponding LUs are able to exchange information. Originally, particular types of LU has specific functions: LU1 for printers, LU2 for displays and so on. As SNA has developed, new types of LU have been introduced that support a broader range of communications facilities. LUs are normally associated with particular Physical Units (PUs), or network devices. LUs provide the services required by Applications (APs) in the IBM SNA environment, sitting between the APs and the PUs. A Dependent LU relies on the host for activation, physically and logically, while an Independent LU can initiate a session without host involvement.
A type of SNA network addressable unit.
A software element within an IBM SNA/SDLC network that provides end users with access to the communication system. A program that uses the network. An LXE 3270 terminal is called a Physical Unit (PU) or LU and the application, too, is called the Logical Unit.
A software port through which an end user gains access to the SNA network in order to communicate with another end user, and through which the end user gains access to the functions provided by system services control points (SSCP). An LU can support at least two sessions, one with an SSCP, known as an SSCP-LU session and one with another LU, known as an LU-LU session. An LU can support many sessions with other logical units.
In Systems Network Architecture ( SNA), a software or hardware component that can manage one end of a session. SNA allows for only a few very specific types of logical units (LUs), each with a well-defined set of abilities and specific protocols--for example, LU type 2 is a display station. For more detailed discussion of LU types see the NetWare for SAA Administration Guide.
A channel in memory through which data transfer occurs between the program and the device or file. See also unit identifier.
(1.) A type of network addressable unit that enables end users to communicate with each other and gain access to network resources. (2.) In SNA, a port through which an end user accesses the SNA network to communicate with another user, and through which the end user accesses the functions provided by system services control points (SSCPs). An LU can support at least two sessions, one with an SSCP and one with another LU, and may be capable of supporting many sessions with other LUs.