""Ken Diliberto"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > 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. :-)
CL; BALanced-UN-balanced = BALUN CL: this gets into the "nucular" versus "nuclear" argument. or is it the "SUPERfluous" versus "suPERfluous" argument? :-> > > >>> "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=53922&t=53860 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
