3270 controller simulation

Dave Wade dave.g4ugm at gmail.com
Mon Nov 18 10:42:09 CST 2019

> -----Original Message-----
> From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Grant Taylor via
> cctalk
> Sent: 18 November 2019 16:22
> To: cctalk at classiccmp.org
> Subject: Re: 3270 controller simulation
> 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
> (serial) interface?
> > 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.
> Or is this more like this:
> [3270]---(coax)---[3174]===(SDLC)===[Cisco]---Ethernet---[Hercules]
> 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?

Yes the second. So it only works with SNA . 

> 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.

Yes its DLSw. Was demonstrated at the recent DEC Legacy event.. 

> > 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
> TN5250 (TN3270).
> So, do any Cisco devices have twinax (?) interfaces for 5250 (or coax for 3270)?

No, I was thinking if you had an older  mid-range box with no TCPIP... 

> 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.

This is where I miss the old IBM offerings cataloge

> --
> Grant. . . .
> unix || die


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