From: jonatale@xxxxxxxxxxxxx
Date: Sat Feb 23 2002 - 14:50:57 GMT-3
actually, it is a transformer
for those EEs out there, you may recall that transformers can be used to match
impeadance which you need to do to maximize the power xfer and/or Sig/Noise.
some MAUs you can set the impeadance (Chipcom/IBM8228???).
kym blair wrote:
> I'm not familiar with IBM MAU model 8228 (I have Synoptics token ring hub),
> but on the 2513 and 2502 you don't use a standard DB9-RJ45 hood; you need a
> "MEDIA FILTER" which looks almost the same (male DB9 but only pins 1,5,6,9),
> but has resistors for token ring. You can find MEDIA FILTERS on eBay for
> less than $10. Some come with a Cat 5 cable wired in; others have the RJ45
> slot for a Cat 5 cable. The Cat 5 cable would be a straight-through.
>
> HTH, Kym
>
> >From: "Ahmed Mamoor Amimi" <mamoor@ieee.org>
> >Reply-To: "Ahmed Mamoor Amimi" <mamoor@ieee.org>
> >To: "Cisco" <Cisco@rsd-tc.com>, <ccielab@groupstudy.com>
> >Subject: RE: Token Ring cabling question
> >Date: Sun, 13 Jan 2002 12:21:05 +0500
> >
> >enjoy the pin configuration below !
> >
> >A DB-9 connector uses four wires (two pairs) for token ring networking:
> >Pin 1 - Red - Receive +
> >Pin 5 - Black - Transmit -
> >Pin 6 - Green - Receive -
> >Pin 9 - Orange - Transmit +
> >
> >A RJ-45 connector is an eight wire twisted pair cable:
> >Pin 3 - Blue/White - Transmit -
> >Pin 4 - White/Orange - Receive +
> >Pin 5 - Orange/White - Receive -
> >Pin 6 - White/Blue - Transmit +
> >
> >RJ45 DB9
> >3 9
> >4 6
> >5 1
> >6 5
> >
> >
> >-Mamoor
> >
> >-----Original Message-----
> >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> >Cisco
> >Sent: Sunday, January 13, 2002 3:24 AM
> >To: ccielab@groupstudy.com
> >Subject: Token Ring cabling question
> >
> >
> >I have never used token ring so I apologize if this question is rather
> >simple.
> >
> >I have a 2502, 2513 and an IBM MAU model 8228. I did not buy the black
> >heavy
> >cables with the MAU but I was able to find them on ebay today, of course I
> >had to purchase another MAU to get the cables. I understand these cables
> >have a RJ-45 connector on one end, is that correct?
> >Now the routers being DB9 connectors, I have two little gizmo's that are
> >DB9
> >to RJ45. I assume I can use a connector to connect the RJ45 from the MAU to
> >the RJ45 from the routers?
> >
> >I searched the archives and I did find something that sounded like this
> >would not be a problem but I wanted to make sure I was reading it correctly
> >and if I needed different cables I was hoping to find out what those would
> >be so I could find some.
> >
> >TIA
> >
> >go
This archive was generated by hypermail 2.1.4 : Thu Jun 20 2002 - 13:46:31 GMT-3