embedded web server user guide

embedded web server user guide Glossary–5
Glossary
channel-attached
(1) Pertaining to direct attachment of devices by data I/O channels to a computer. (2)
Pertaining to devices attached to a control unit by cables, not telecommunication lines (D).
Synonymous with local.
channel path
CHP. A single interface between a central processor and one or more control units, along
which signals and data are sent to perform I/O requests (D).
channel path identifier
CHPID. In a channel subsystem, a value assigned to each channel path of the system that
uniquely identifies the path (D). See also channel-to-channel (channel-to-channel)
(input/output configuration program).
channel subsystem
CSS. A collection of subchannels that direct the flow of information between I/O devices and
main storage, relieve the processor of communication tasks, and perform path management
functions (D).
channel-to-channel
CTC. A channel attached to another channel (channel-to-channel) and specifies the I/O mode
of operation for the channel path under the I/O configuration program (IOCP) channel path
identifier (CHPID) statement ‘Type’ parameter (D). See also channel path identifier
(input/output configuration program).
channel wrap test
A diagnostic procedure that checks S/390 host-to-Director or host-to-Switch connectivity by
returning the output of the host as input. The test is host-initiated and transmits Fibre Channel
frames to a Director or Switch port. A Director or Switch port enabled for channel wrapping
echoes the frame back to the host.
CHP
See channel path.
CHPID
See channel path identifier.
Class 2 Fibre Channel service
Provides a connectionless (not dedicated) service with notification of delivery or nondelivery
between two node ports (N_Ports).
Class 3 Fibre Channel service
Provides a connectionless (not dedicated) service without notification of delivery or
nondelivery between two node ports (N_Ports).