Tony Harminc wrote:
> In passing, I have no idea why JES2 would no longer support CTCs. Are
> FICON CTCs completely incompatible with Bus&Tag (and 3088) and ESCON
> ones? Where are the FICON ones documented?
Actually, I don't know for sure where the support fails.
1) JES2 requires that the CTCA be defined as in 'basic' mode.
2) When generating an IOCP for FICON, is is possible to define it as
'basic' just as needed by JES2, but,
3) The IODEF build fails when you try to define the FICON as 'basic'.
I don't know if the IOCP people intended to remove the 'basic' option,
or, if the IODEF people just never considered putting in 'basic' CTCA
support for FICON.
When I asked IBM, I got the response: "It does not matter because NJE
over TCP/IP is the future, not CTCAs."
Tony Thigpen
Tony Harminc wrote on 5/30/19 6:12 PM:
On Wed, 29 May 2019 at 13:46, Jesse 1 Robinson <jesse1.robin...@sce.com>
wrote:
Thank you, that was my point about non-CTC links. When I started here in
the 90s, BSC links were still in use. First for NJE to VM/XA because our
implementation did not include VTAM, and for some JES2 connections because
of a perception that BSC was faster than SNA. A little testing dispelled
the latter myth, and we converted all JES2 links in short order. By the
time FCTC emerged, we were 100% SNA.
BSC was not the line-level protocol used by JES2 over (old style) CTCs. It
was *similar*, but BSC CCWs and the overall protocol are not the same as
for CTCs. BSC ran on synchronous lines via a communications controller like
a 37x5. It is perhaps a bit like SNA for 3270s. There are/were local
(channel-attached) 3270 control units of two types - non-SNA and SNA. VTAM
supported both; things like MVS consoles supported only non-SNA. There were
also remote 3270 control units using BSC or using SNA. Regardless of the
low level transport the 3270 data stream was used. For NJE the multileaving
protocol is used regardless of the underlying transport.
In passing, I have no idea why JES2 would no longer support CTCs. Are FICON
CTCs completely incompatible with Bus&Tag (and 3088) and ESCON ones? Where
are the FICON ones documented?
Tony H.
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