IMHO you should get rid of BCTC. It is obsolete.
As I read somewhere, BCTC was on S/360 machines, and SCTC requires S/370
mode.
BTW: CTC can be on Bus&Tag (both BCTC and SCTC), can be on ESCON.
It also can be on FICON, but only as FCTC, which is AFAIK almost the
same as SCTC (at least for VTAM and XCF).
--
Radoslaw Skorupka
Lodz, Poland
Steve Arnett wrote:
Folks,
I wrote a program to communicate between two LPARs using a CTC
connection. I was having a problem with occasional I/O errors. I
originally had the program on an SCTC connection and swicthed it over to
a BCTC connection. Since moving it, I have had no problems with the
program. Both the SCTC and the BCTC are runninng between two ESCON
channels(91/92 is SCTC and 9A/9B is BCTC) on our z/890 with an ESCON
cable attaching each pair. I currently have VTAM running over the SCTC
pair between the LPARs and have had no problems with it, so I am
assumiong that I do not have a bad cable. That woudl leave the
differences between the SCTC and BCTC devices as the only other cause.
While I have seen one vague comment on this board about IBM not
modifying GRS to use SCTC and hence requiring BCTC, I have been unable
to find any documentation pointing to differences between the protocols
and how programming them would differ. Is anyone on this board aware of
any such documentaion? If so, could you direct me to it?
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