17 Feb
2019
17 Feb
'19
1:23 a.m.
I should look for more details. It sounds like some 3174's, with proper
firmware, can actually function in both directions.
Coax connected 3270 terminals using the 3174 as a gateway to connect to
something across the network (Token Ring or maybe Ethernet) via telnet.
I suspect this is what a number of Hercules systems are doing.
I would say the 3174 is acting more as a Terminal Server rather than a gateway.
So 3270 CO-AX terminals which are directly attached to the 3174 can connect
via TN3270 to another host. Often this is Hercules where Hercules provides a
a TN3270 server which is presented to the host as a channel attached 3174...
A 3174 can have either a Token Ring or Ethernet interface but not both.
(it can also have hdlc/sdlc/bi-sync and bus+tag)
I think it's also possible to have (Token Ring or
Ethernet) network connected
clients telnet to and use the 3174 as a gateway to connect to ESCON / Bus
and Tag machines.
The 3174 never acts as a telnet server but.........
A channel attached 3174 can be used to pass TCPIP into the mainframe
and there are products that run on the mainframe that act as Telnet/TN3270 servers.
So in effect it acts as a channel attached network interface for the mainframe.
Some 3174s have RS232 ports, so locally attached serial terminals can
connect to the mainframe. This can be via Channels or via remote network
connectivity, SNA token ring, X.25, SNA over Ethernet.
The posts
I've seen say one either needs a router to act as a token
ring to Ethernet bridge, or a PC with both token ring and Ethernet
cards in it to act as a bridge.
I tend to agree. My only qualm / uncertanty is "bridge" vs "route".
But this is likely the pedantic part of me that knows
enough details to think
"Wait, tab A doesn't directly fit in slot B, what gives?" in this
situation.
If the 2513 you have is the one that was used for this, I'd love to see the
config, if it's still on there. That would very likely settle things for my
curiosity. But that's likely not going to happen. 1) The config should have
been wiped before leaving a business, and 2) you shouldn't show it to a
stranger even if #1 didn't happen.
Do a search on "CISCO SNA Token Ring Bridging". Lots of papers on there.
Last time I fired this lot up I used the CISCO as an IP router and then used NAT
In the CISCO hide the token ring from main network. Now I have a 3174 with
An Ethernet card and a P390 with a bigger selction of Oss I have lots of options...
... but I am currently distracted by a pile of VAXen
--
Grant. . . .
unix || die
Dave