3270 controller simulation
cctalk at gtaylor.tnetconsulting.net
Mon Nov 18 10:22:00 CST 2019
On 11/18/19 2:56 AM, Dave Wade via cctalk wrote:
> Whilst not what you are looking for some one has been working on
> supporting CISCO SDLC encapsulation in Hercules.
Are they working on Cisco's SDLC line protocol and / or physical
> So this allows real 3270's to connect to Hercules from a 3174 with only
> SDLC ports by going via a CISCO router with an SDLC port.
So something like this:
---(coax)---===(SDLC)===??? ... ???---[Hercules]
What is the physical / logical connection to Hercules and the machine
it's running on?
Or is this more like this:
In that the Cisco translates from the physical SDLC circuit to Ethernet
and maybe does a protocol conversion to send things into Hercules across
standard Ethernet? Meaning that the Cisco becomes a fancy remote SDLC
interface that Hercules communicates with?
I've been pontificating DLSw coming out of OS/390 running in Hercules /
on my P/390-E to a Cisco and leveraging DLSw support to connect SNA
(802.2 SNAP) to clients downstream.
This seems similar but is integrating an SDLC link to a 3174.
> I wonder if you could do the reverse. So go TN5250 into a Cisco and then
> emerge as SDLC....
Hum. I thought the TN5250 (and TN3270) was the 5250 (3270) protocol
over TelNet. As such, I don't think a 5250 (3270) terminal can speak
the TN5250 (TN3720) protocol at all. Instead, they need some sort of
physical device that they can connect to that will gateway from
<whatever> physical w/ 5250 (3270) protocol to any IP network with
So, do any Cisco devices have twinax (?) interfaces for 5250 (or coax
I know that older & larger Cisco gear has the Channel Interface
Processor that can attach to Bus & Tag channels from a mainframe and
convert from TN3270 (I presume TN5250) to the physical B&T interface and
necessary protocols there over for the mainframe. But that's decidedly
going the opposite direction.
Perhaps ~> hopefully I'm just ignorant of other solutions from Cisco, or
anyone else, that will do what is desired. I believe the *Remote* 3174
(et al.) is one of these devices from IBM. IBM's "Enterprise Extender"
comes to mind too. But I don't know what sort of down stream equipment
that connects to.
Grant. . . .
unix || die
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