Here's the fun part with these connectors: For this "fun" to work, you need the following:
[SWITCH]--[Balun1]--[Token-ring wire]--[Balun2]--[Device/PC] Everything runs normal until yon knock (or should it be spelled NOC ;-) ) Balun2 off the wall. At this point, the IDC (or UDC if you're from IBM) shorts the transmit and receive pairs together. The network all of a sudden comes to its knees. Why? BPDUs go out the Balun interface saying they have MAC addresses off other ports. When the packets hit the wire where Balun2 use to be, it returns back to the switch, making the switch think all the MAC addresses have moved to that port. Now the switch is confused and tries figuring out where everything is but the process continues. This actually happened to me as we converted a network from Token Ring to Ethernet. It was cheaper for us to purchase a bunch of baluns compared to pulling new wire (we wanted to pull new wire but the money wasn't there). Way too much fun. Ken Note: Some people call them a balun and others a balum. I don't care. You decide. :-) >>> "Ken Chipps" 09/22/02 01:28PM >>> As I recall from the old days of using Token Ring there was some reason you could not just make these. You have to buy them already made. Something to do with the circuitry. I can look in my Token Ring stuff, after I blow off the dust, if anyone really wants to know. Assuming I am remembering this right. I searched google using media filter token ring. A bunch of sites that sell these pop up. Just buy one. They are around 20 each US. ""Chuck's Long Road"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > so far as I know, the connector is not "really" a db9. It is a token ring > media filter > > Reading the unit I use, on the "db9" side, TX is on wires 5 and 9, while RX > is on wires 1 and 6. > > On the "rj45" side, TX is indicated as wires 3 and 6, while RX is using > wires 4 and 5. > > What happens between the RJ side and the DB side, I do not know. > > -- > > www.chuckslongroad.info > like my web site? > take the survey! > > > > ""hall annie"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Okay, I give up. I can't seem to get this to work. I've tried various > > adapters (self-done) and I'm stuck. I have a 2502 and I don't have the > > rj-45 to db9 adapter, and I need to fabricate one. Does anyone know the > > pinout colors that will work with a Cisco 2502? > > > > I thought it was 1-red 5-black 6-green 9 -orange (on the db9 to rj45 > > adapter), but lately I've been thinking it might be: 1-green,5-black, > 6-red, > > 9-orange.... > > > > Or perhaps I've got a bad db9 port on my 2502? I have a known good rj45 > > token ring mau/lam. It works when it connects to servers/workstations > that > > have rj-45 ports on their token ring cards, but not with my "home-made" > > rj-45 adapter for my Cisco router. > > > > Can anyone assist? Thanks in advance..... Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=53911&t=53860 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
