Hello, all. I've been working with Steve Rivera trying to find some AS51 cables, and on second thought, the info is valuable to anyone still running (or needing in my case) to run AS51's, so I'm posting it for the general masses to absorb. I apologize if any of this info is 1) old, 2) redundant, 3) been covered before, or 4) so old nobody really cares :) Since the AS51 is essentially nothing more than a Cisco 2511 on a card, I just *assumed* all of the cables are compatible. Well, most are, console/aux, ethernet, sync serial all are. However, async serial is NOT. I've been occasionally whacking my head against the wall over the last few days, trying to get this blasted AS51 chassis to work properly. I'd been using a standard CAB-OCTAL-ASYNC cable with it, and no joy whatsoever. Worked like a champ attached to an NT server, as well as an external 2511. Well, after further digging, I think I have my answer, very unfortunately. Although Cisco's docs allude to the cables being compatible between AS51 and 2500 series routers, a few USENET posts (via Google) say otherwise. http://groups.google.com/groups?q=cab-as51-8&ie=UTF-8&oe=UTF-8&hl=en (Not sure if it will work, if it did, the last two hits and their parent postings are of interest) Cisco links are: http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/cis2500/2509/... and http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/5100_sbd/510... Now, totally contrary to conventional thinking, a connector's pins are numbered the same, regardless of application, right? If you look at the tables showing the pinouts, and compare them, you'll see that they match up fine, with the only discrepancy being that the AS51 specific cable has pins 34 and 35 tied together. Well, assuming that Cisco would number the pins the same for two like connectors was the real mistake here. Notice the pin numbering looking *into* the connector! The pinout numbering is a mirror from one to the other. Not exactly a great move on Cisco's part, especially seeing that everything else is the same, IOS and all. Damn. And I'd be willing to bet that it was a PC board layout issue of some form (mirrored connector footprint or netlist numbering, schematic entry error, whatever) that caused it too. Rather than correct it so they do interchange, they create a new cable. Neat. So, I really *do* need the Cisco HD68 to dual HD50 cables. Their part number is CAB-AS51-8, and it appears that this is the only cable they sell for the AS51. I'm hoping that the NIC's aren't damaged as one posting hinted could happen. I knew better, "assume" something, you're going to get burned. I guess I should have turned to Google sooner. An educated guess tells me they should be OK, since most serial ports are short-circuit protected, etc., but at this point, all bets are off. Steve is looking for me (thanks Steve!), but if he comes up dry, I'm in the market for 6 (or probably more like 8 so I have spares) cable sets for the AS51. I don't want to make them, but have the resources to do so if I can't find them used or NOS, and I can't get them from Cisco anymore (reasonably). Thanks for your help! Brad