18 Nov
2019
18 Nov
'19
9:52 a.m.
On 11/18/19 10:38 AM, Dave Wade wrote:
I go TN3270 from the 3174 -> Hercules so the
screens look like local
screens to the OS. This is how most folks have done it.
I forgot about the fact that Hercules, not the mainframe OS, is doing
some translation.
Do you know what protocol name would be used to describe the
communications between the mainframe OS and what it thinks are locally
attached terminals?
It needs a big(ish) 3174 and the C6.3 or 6.4
microcode.
ACK
As MVS 3.8J does not understand DLSw (it has no TCP)
Matt unpicks the
DLSw in Hercules so MVS sees (I think) an SDLC connected 3174.
Hum. ... Very intriguing.
Am I understanding you correctly to mean that Hercules itself has some
DLSw functionality?
Part of me wants to ask if the 3174 support can be used for SNA out of
the mainframe, as in the below diagram. But my reading of various
pieces of Hercules documentation indicate that it can't be done (yet).
[Mainframe OS]---(SDLC)---[Hercules
3174]---(DLSw)---[Cisco]---(SNA)---[client]
You are not being obtuse. IBM networking covers so
many options its
not true.
Thank you for understanding.
I think TN3270 connected screens usually look like
they are "local"....
ACK
Define "most" and "when".
"most", in this context, is more to allow for my loose understanding and
zero exposure.
I'm not tracking "when".
I have 4 x 3174s plus the guts of two more. None have
channel interfaces.
Do you have the model numbers handy? (I assume the all the type numbers
are 3174.)
The first three I bought years ago had token ring
interfaces and serial
interfaces which I think can be bi-sync or SDLC.
Two of the others have token ring, and one has ethernet. I think many
connected over token ring...
That sounds like Remote 3174s. At least based on my limited and likely
flawed understanding.
My understanding is that:
? Local 3174s were channel (?) attached to the host.
? Remote 3174s were SDLC / X.25 / Token Ring / Ethernet connected to
Local 3174s.
Where "local" is physically close to and connected to the host.
Similarly "remote" is not physically close nor connected to the host.
--
Grant. . . .
unix || die