On Wed, May 24, 2023 at 3:06?PM Alice Wyan <finitud@...> wrote:
Hi,
I just came across the TELEBAHN network and don't have much idea of how to start exploring, I've never used X.25 before :)
Can any Cisco router do XOT / X.25 routing? Does it require additional hardware?
It might, if you want to have a "subnet" with more than one device. If I understand things correctly, Cisco IOS will not route from XOT to XOT – if you make a call locally (or if it arrives via serial link) then you can talk to any other host via XOT, but if a call *comes in* via XOT it can only be routed to a physical interface (e.g. Serial0/1 on a WIC-2A/S or WIC-2T<2>). Fortunately my Cisco1760s all had serial cards but I had to find some cables to connect them<1>. (No, async ports like Aux0 won't work.) As far as software goes, though, the lowest-end "y" (Basic IP) IOS image (the only thing that fits in them) was enough for X.25 and XOT.
<1> (Chonky CAB-SS-V35MT<->
CAB-SS-V35FC at first, but later I found out that eBay has unofficial "back-to-back smart-serial" serial cables nowadays.)
<2> (WIC-1T seems to lack the "clock generation" pieces – as the manual mentions it lacking a CSU/DSU – so I assume it wouldn't work for a back-to-back connection; you need one side capable of providing clocking.)
