Visara SCON-20L Configuration Manual - Manual (Page 126)

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SCON-20L/22L/25L/28L Configuration Manual
ESCON - Enterprise Systems Connection. The term used to describe the fiber optic
channel connection used on most ES9000 processors.
ESCON XDF - ESCON Extended Distance Feature. A feature that uses laser/single-
mode fiber technology that extends unrepeated link distances up to 20 KM (12.5 miles).
Explicit Device Candidate List - This is a panel found in the HCD panels of OS/390
environments when EMIF is being used, that is used to identify which LPARs have
access to the device in question.
HCD - Hardware Configuration Definition. This is the facility used in OS/390
environments to define hardware that will be attached to the host.
Host Circuit - This is the term used in the SCON-2XL configuration that corresponds
to a set of terminal definitions supported by a single CU. Each CU/Host Circuit defined
must have a corresponding CUADD definition on the host. The SCON-22L supports a
maximum of 16 Host Circuits, the SCON-20L supports 2, and the SCON-25L supports
up to 32.
Host Gen - The configuration definitions for hardware attached to the mainframe, that
informs the mainframe what types of hardware is attached and how to communicate
with it.
Hot Sessions - Console sessions that always appear to be powered on whether or not a
display is actually powered on or connected (Telnet and TN3270).
IOCDS - Input Output Configuration Data Set. The data set created and loaded
onto the support element for defining the channel connections and attached hardware
to CPU.
LMU - Library Management Unit. The name of the unit used to manage a StorageTek Silo.
LPAR - Logical Partition. Each LPAR on the host operates with its own operating
system, and can be brought up and taken down independent of the other LPARs defined
on the same mainframe.
MCS Console - Multiple Console Support console. All MVS consoles are MCS consoles,
once MVS is up and running. Up to 99 MCS consoles can be defined in the CONSOLxx
member of PARMLIB. Prior to the MCS consoles coming active, the NIP console is
used to control the bring up of MVS.
MLS - Multiple Logical Sessions. This feature of the SCON-2XL allows a single CUT
device such as a coax terminal to have up to 10 sessions simultaneously. The user
switches between these sessions through the use of a session swap hot key.
NIP Console - Nucleus Initialization Program console. This is an MVS console used
for a short period during initial startup, assigned through the HCD. If more than one
NIP console is defined, the first active console in the list will be used, the rest in the list
are used as alternate consoles. If the first active breaks communication with the host,
the NIP function will pass to the next active alternate in the list. Once the Multiple
Console Support function comes up, the NIP console function ceases, and all other
MVS consoles come active. (It is common to define the NIP console device to also
function as the MVS master console.