28 Apr
2011
28 Apr
'11
7:42 p.m.
I need an ethernet converter between 10base2 and 100baseT.
I am using a DECserver90TL as a console server. The DECserver is 10base2
ethernet, so it has a BNC connector and I use coax to connect to an ethernet
hub. I was using a hub that had both 10baseT and 10base2 to connect it to my
100baseT network, but the hub has suddenly become unidirectional. A
lightening strike killed a few things in my house and now I see this hub
might be another.
eBay only finds me two items like this. One seems over priced and the other
says it is for parts only.
Do I have any other options?
-chuck
28 Apr
28 Apr
8:07 p.m.
All,
On 29 April 2011 10:42, Charles Dickman <chd at chdickman.com> wrote:
I need an ethernet converter between 10base2 and
100baseT.
I am using a DECserver90TL as a console server. The DECserver is 10base2
ethernet, so it has a BNC connector and I use coax to connect to an ethernet
hub. I was using a hub that had both 10baseT and 10base2 to connect it to my
100baseT network, but the hub has suddenly become unidirectional. A
lightening strike killed a few things in my house and now I see this hub
might be another.
eBay only finds me two items like this. One seems over priced and the other
says it is for parts only.
Do I have any other options?
I am in the process of setting up something to do exactly the same
thing, to the point where I am likely to need the boot image for the
DECserver really soon now. My approach is somewhat not optimal but
I'll describe it for the purposes of entertaining the people here.
Amongst the collection of stuff I have includes a couple of elderly
Sparc boxes. My ADSL modem/router will happily serve up files from a
USB attached external disk, appearing as a windows share (or whatever
the correct windows terminology is). I wish to also plug in a large
HDD and make this available via NFS to the other Unix boxes I own. I
am also guessing that I am going to need a MOP server for the boot
image for the DECserver.
So, here goes. I have an SS20 (2 x Sparc CPUS). I have recently
(arrived last week) got the 100MB hme SBus card for it - which seems
to work and NetBSD is able to talk to it. The SS20 has an old install
of NetBSD installed on it. I am currently in the process of upgrading
to 5.1 (I think) via tape (DLT) as I have a couple of DLT drives and
tapes stashed away.
The plan is to use the SS20 running NetBSD to convert between 100BaseT
and 10BaseT. There is 10BaseT externally but I don't have any of the
tranceivers with the small AUI connectors to fit the back of the SS20.
The SBus ethernet card with the 10Base2 connector on it does not fit
the SS20 at all well. :( So, the SS20 will be bridging ports, mounting
with windows file systems and hopefully exporting the filesystem as
NFS. There is some other stuff I want to run on the SS20 as well but
that is for later.
Some years ago, I picked up a couple of Sun IPX boxes and purchased
the 64MB of RAM to max them out. The IPX houses the SBus 10Base2
Ethernet card happily and also has a real AUI socket on the back where
I can use real tranceivers. The plan is to install OpenBSD on the IPX,
run it as a MOP server and connect it, back to back, to the SS20 using
10BaseT. I should then be able to get the DECServer running on the
10Base2.
My only concern is that I am running some infrastructure on elderly
hardware. I am not running this 24x7 so I am not necessarily concerned
about the efficiency.
Simon
--
------------------------------------------------------------------------
"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh
8:29 p.m.
That is probably going to be the easiest route, otherwise look around
for an old HUB on Ebay that has a 10base2 connector on it with a bunch
of 10baseT ports...
LIke this, not mine:
http://cgi.ebay.com/CentreCom-MR820TR-8-Port-10-BaseT-10-Base2-AUI-Hub-/220…
Otherwise yeah, just take an old PC, plop a 10base2 card and a 10baseT
card into it, install NetBSD or similar and just Bridge the two networks
and use the PC as a simple router.
Simon Fryer wrote:
All,
On 29 April 2011 10:42, Charles Dickman <chd at chdickman.com> wrote:
I need an ethernet converter between 10base2 and
100baseT.
I am using a DECserver90TL as a console server. The DECserver is 10base2
ethernet, so it has a BNC connector and I use coax to connect to an ethernet
hub. I was using a hub that had both 10baseT and 10base2 to connect it to my
100baseT network, but the hub has suddenly become unidirectional. A
lightening strike killed a few things in my house and now I see this hub
might be another.
eBay only finds me two items like this. One seems over priced and the other
says it is for parts only.
Do I have any other options?
I am in the process of setting up something to do exactly the same
thing, to the point where I am likely to need the boot image for the
DECserver really soon now. My approach is somewhat not optimal but
I'll describe it for the purposes of entertaining the people here.
Amongst the collection of stuff I have includes a couple of elderly
Sparc boxes. My ADSL modem/router will happily serve up files from a
USB attached external disk, appearing as a windows share (or whatever
the correct windows terminology is). I wish to also plug in a large
HDD and make this available via NFS to the other Unix boxes I own. I
am also guessing that I am going to need a MOP server for the boot
image for the DECserver.
So, here goes. I have an SS20 (2 x Sparc CPUS). I have recently
(arrived last week) got the 100MB hme SBus card for it - which seems
to work and NetBSD is able to talk to it. The SS20 has an old install
of NetBSD installed on it. I am currently in the process of upgrading
to 5.1 (I think) via tape (DLT) as I have a couple of DLT drives and
tapes stashed away.
The plan is to use the SS20 running NetBSD to convert between 100BaseT
and 10BaseT. There is 10BaseT externally but I don't have any of the
tranceivers with the small AUI connectors to fit the back of the SS20.
The SBus ethernet card with the 10Base2 connector on it does not fit
the SS20 at all well. :( So, the SS20 will be bridging ports, mounting
with windows file systems and hopefully exporting the filesystem as
NFS. There is some other stuff I want to run on the SS20 as well but
that is for later.
Some years ago, I picked up a couple of Sun IPX boxes and purchased
the 64MB of RAM to max them out. The IPX houses the SBus 10Base2
Ethernet card happily and also has a real AUI socket on the back where
I can use real tranceivers. The plan is to install OpenBSD on the IPX,
run it as a MOP server and connect it, back to back, to the SS20 using
10BaseT. I should then be able to get the DECServer running on the
10Base2.
My only concern is that I am running some infrastructure on elderly
hardware. I am not running this 24x7 so I am not necessarily concerned
about the efficiency.
Simon
--
------------------------------------------------------------------------
"Well, an engineer is not concerned with the truth; that is left to
philosophers and theologians: the prime concern of an engineer is
the utility of the final product."
Lectures on the Electrical Properties of Materials, L.Solymar, D.Walsh
29 Apr
29 Apr
5:02 a.m.
On 4/28/11 11:07 PM, Simon Fryer wrote:
My only concern is that I am running some
infrastructure on elderly
hardware. I am not running this 24x7 so I am not necessarily concerned
about the efficiency.
If you're talking about the SS20 and IPX machines here, don't worry
about that, as they're both recent enough to be very power-efficient.
The IPX in particular pulls very little power.
-Dave
--
Dave McGuire
Port Charlotte, FL
28 Apr
28 Apr
8:44 p.m.
On 28 Apr 2011 at 22:42, Charles Dickman wrote:
I need an ethernet converter between 10base2 and
100baseT.
On eBay, there's a vendor selling IMC MM850 transceivers/media
converters for less than $10 *new* (at their peak market, they sold
for almost $200).
See item: 300550722049
Cheers,
Chuck
8:54 p.m.
At 10:44 PM 4/28/2011, Chuck Guzis wrote:
On 28 Apr 2011 at 22:42, Charles Dickman wrote:
There are several variations of MM850.
Is this what you think it is?
http://www.provantage.com/imc-networks-55-10230~7IMCN08W.htm
McBasic TP/Fo 10MBPS Ethernet MM850-ST 4KM 10MB Copper/10MB Fiber
- John
I need an ethernet converter between 10base2 and
100baseT.
On eBay, there's a vendor selling IMC MM850 transceivers/media
converters for less than $10 *new* (at their peak market, they sold
for almost $200).
See item: 300550722049 
9:19 p.m.
hello this migt work for you
http://ncix.com/products/?sku=49120B22&vpn=J%2FE%2DCX%2DTBT%2D02%2DNA&a…
chris
On Thu, Apr 28, 2011 at 8:54 PM, John Foust <jfoust at threedee.com> wrote:
At 10:44 PM 4/28/2011, Chuck Guzis wrote:
On 28 Apr 2011 at 22:42, Charles Dickman wrote:
There are several variations of MM850.
Is this what you think it is?
http://www.provantage.com/imc-networks-55-10230~7IMCN08W.htm
McBasic TP/Fo 10MBPS Ethernet MM850-ST 4KM 10MB Copper/10MB Fiber
- John
I need an ethernet converter between 10base2 and
100baseT.
On eBay, there's a vendor selling IMC MM850 transceivers/media
converters for less than $10 *new* (at their peak market, they sold
for almost $200).
See item: 300550722049
9:28 p.m.
On 28 Apr 2011 at 22:54, John Foust wrote:
There are several variations of MM850.
Is this what you think it is?
http://www.provantage.com/imc-networks-55-10230~7IMCN08W.htm
Stupid vendor--used the generic description for the series--from what
I can see, this is the FO version. Damn.
How about 380335678677
Chuck
29 Apr
29 Apr
9:30 a.m.
----- Original Message -----
From: "Charles Dickman" <chd at chdickman.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Thursday, April 28, 2011 8:42 PM
Subject: 10base2 to 100baseT conversion
I need an ethernet converter between 10base2 and
100baseT.
Three simple options:
1. If you have an AUI port on the DECserver you can get a UTP transceiver.
This is what I've done on some gear.
2. Some older 10BaseT hubs have a 10Base2 connector. You could have a
thinnet segment on your network connected to the hub, then connect the hub
to your 100BaseTX/1000BaseT switch to effectively bridge the networks.
3. If your router can take another network card, you could add a 10Base2
card to it and set up a separate network segment, and route traffic between
your LANs.
1. is easiest, 2 is only marginally harder in that you need a larger piece
of hardware. One thing nice about 2 is that you can run as much 10Base2
stuff as you want that way without needing any more hardware other than an
appropriate run of thinnet wire.
Jim
6:18 p.m.
On Thu, Apr 28, 2011 at 10:42 PM, Charles Dickman <chd at chdickman.com> wrote:
I need an ethernet converter between 10base2 and
100baseT.
I looked in the attic and discovered I already had the solution. I have a
DEChub 90
and a DECrepeater 90T-16. Plug the DECrepeater and DECserver into
the DEChub and I get my DECserver on a 10MB network that is connected to
100baseT (via the DECrepeater) and 10base2 (via the DEChub) networks.
The DEChub power supply fan is kind of noisy, so I need to look into that.
I think I need to get an old rack mounted hub/switch that has all the
conversions.
I also think that I need to keep spares in mind a bit more.
Thanks for all the suggestions.
-chuck
4766
days inactive
4767
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9 comments
8 participants
participants (8)
-
cclist＠sydex.com -
chd＠chdickman.com -
curt＠atarimuseum.com -
fryers＠gmail.com -
halarewich＠gmail.com -
jfoust＠threedee.com -
jim＠photojim.ca -
mcguire＠neurotica.com