[ale] Why would a uverse ethernet work but not a switch?

[Jim Kinney]

I thought the switch changed. Thus new switch doesn't have auto and
wiring is backwards.

On Thu, 2019-04-11 at 13:20 -0700, Alex Carver via Ale wrote:
> Good point, the Uverse router does not have auto MDI/MDX capability
> onits ports and not all switches have that either (or they have it
> only onspecific ports).  However, since this configuration worked at
> first andnow does not would imply the wiring was OK originally so
> crossoversshouldn't have happened unless any of the building wiring
> was changed.
> As for number of wires, yes 100Base-T only requires two pairs but
> theother two dead pairs are actually very important for
> maintainingimpedance in the cable suitable for use at 100 MBit.
> On 2019-04-11 12:11, Jim Kinney via Ale wrote:
> > You might want to test the line in the wall and see if it's wired
> > A/A,B/B or cross-over style A/B at the wall jacks. The color coding
> > needsto be identical on both ends of the connection in nearly all
> > cases.Unless the new switch is just too stupid. Used to be switch
> > to switchREQUIRED a crossover cable. Most, but not all, are now
> > smart enough toreverse in/out on plug-in. On Thu, 2019-04-11 at
> > 10:13 -0400, Derek Atkins via Ale wrote:
> > > Hi,Alex Carver via Ale <ale at ale.org> writes:
> > > > It might still be a firmware update that at first didn't
> > > > haveVLANsupport and then later did.If you want to really test
> > > > it, gather everything up together inonelocation and replicate
> > > > the configuration you have (TV + Routerintoswitch, switch into
> > > > modem) with short patch cables.  If allworks wellthen yes
> > > > you've got a broken wire in the infrastructurewiring.  If
> > > > itdoesn't work you've got a VLAN problem.
> > > 
> > > When I connect the switch directly to the router locally,
> > > thelinklights up (i.e, I get blinky lights both on the router and
> > > on theswitch).When I connect the switch through the wall, the
> > > link lights doNOTilluminate, either on the switch or on the
> > > router.A VLAN misconfiguration would not cause this behavior.
> > > > It's also strange to see that your in-wall wiring is two pairs
> > > > butwiredto 8p8c jacks?  Is it unshielded twisted pair (CAT3) or
> > > > is ita bundledrun (straight wire) meant only for voice (in
> > > > which case itshould havebeen using 6p4c/RJ12 connectors).
> > > 
> > > There are many many pairs of wires in there.  It's probably
> > > cat3cable,but there are probably 5-6 pairs in there.  There is a
> > > singlecable withmany pairs that goes into the box in the other
> > > room, andtwo pairs areconnected to the RJ45.They need to use a 8p
> > > jack because it is ETHERNET.  Remember thatatleast 100BaseT only
> > > requires 2 pairs, and I think GigE alsoonlyrequires 2 pairs.I
> > > just don't understand why the switch is unhappy behind the 2
> > > pairsbutmy other devices are just fine.  I.e., it doesn't matter
> > > whether Iplugin the Uverse box or the Smart TV -- both of them
> > > work(individually) inthe other room.  But if I put the switch
> > > there, theswitch wont sync tothe router.-derek
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-- 
James P. Kinney III

Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

http://heretothereideas.blogspot.com/

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