Attention delay, Blocking delay(msec), Maximum response length bytes – Visara LINCS Configuration User Manual
Page 57: Important - ucw/iocp definitions
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Chapter 3. Line Options
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Attention Delay
The Attention Delay is a Channel/SNA option that allows the control unit to queue inbound
data for a specified period of time before presenting an attention status to request a read
channel program. The option gives the control unit the capability of queuing several read
requests during the delay period and then request one read channel program to transfer all the
data, thereby reducing the number of unsolicited attention status’s presented to the host.
Attention Delay times are in the range of 10 to 99 milliseconds. The default delay time is 10
milliseconds.
This function is supported only for SNA Host Circuit PUs. It is not supported for Gateway
Circuit PUs.
Blocking Delay(msec)
The Blocking Delay is the maximum period of time that LINCS will wait, once it has received
inbound traffic, before it will send all data inbound. During this time interval, LINCS will
collect inbound traffic and buffer it until one of two things occurs: 1) the Blocking Delay
timer expires, 2) 32 KB of data has been accumulated (the maximum amount of data that can
be sent inbound at one time). The default value that LINCS uses is 40 msec.
Maximum Response Length Bytes
The value of this parameter determines how LINCS will handle inbound frames. Frames
smaller than the indicated value will be forwarded to the host immediately, while larger frames
will be queued and sent according to the rules for the Blocking Delay. The default value used
by LINCS is 500 bytes.
IMPORTANT - UCW/IOCP Definitions
To implement Local Channel Communications in the network, you need to set up Unit Control
Word (UCW)/Input Output Control Program (IOCP) definitions at the host. The recommended
definitions are the following:
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Where a Shared UCW is recommended, an Unshared UCW will work, but performance on
the channel will be degraded. IOCP limits the number of channel addresses that can be defined
as Shared to 128 in a single CNTLUNIT macro (therefore requiring selection of Unshared for
certain configurations).
For more information, see Steps in defining UCW/IOCP definitions.