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navydavy2001
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PostPosted: Wed May 23, 2007 3:23 pm    Post subject: Reply with quote Back to top

Packet loss is fine, but I wanted to know about colliisions. I'm still not confident that this is a better solution then simply connecting the second device directly to the networking device via CAT5. To me, honestly, it seems like a half-assed approach that is geared toward non-technical users, who think splitting CAT5 is like splitting phone cords. That may not be true, but it's what I'm feeling.

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mjstraw
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PostPosted: Wed May 23, 2007 4:49 pm    Post subject: Reply with quote Back to top

Dave,

They can be handy (when used properly ie with 10Mb) when running another cat5 to a location is inconvenient or expensive.

Then again, I'm just "misinformed" so don't believe anything I say...

Mark
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PostPosted: Wed May 23, 2007 6:09 pm    Post subject: Reply with quote Back to top

mjstraw wrote:
Dave,

They can be handy (when used properly ie with 10Mb) when running another cat5 to a location is inconvenient or expensive.

Then again, I'm just "misinformed" so don't believe anything I say...

Mark


Mark,

One thing I forgot to ask is what kind of splitters you used that you could run only 10M, but not 100M? I want to know if you are using the correct ones.

I am asking this because there are a lot of RJ45 splitters being sold on the Internet which were wrong or useless even though they look the same as my splitters. Such a "wrong" RJ45 splitter does not split the 4 twisted pairs of a CAT5 into 2 sets. Instead, it just wires the 4 twisted pairs to both RJ45 ports (called parallel wiring). It will cause tons of signal collisions when the two RJ45 ports are connected to two devices at the same time.

Click to see a wrong RJ45 splitter on eBay

John
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mjstraw
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PostPosted: Wed May 23, 2007 8:05 pm    Post subject: Reply with quote Back to top

hubbell

and if it was parallel it wouldn't even work at 10Mb

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navydavy2001
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PostPosted: Wed May 23, 2007 9:36 pm    Post subject: Reply with quote Back to top

mjstraw wrote:

Then again, I'm just "misinformed" so don't believe anything I say...

Mark


Forget it, I'm never reading another one of your posts now. Very Happy

So, am I to understand that what this device is actually, is the insides of a two-port dumb hub? If that is what it is, then I can understand that.

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dualcomm
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PostPosted: Thu May 24, 2007 2:19 am    Post subject: Reply with quote Back to top

navydavy2001 wrote:

So, am I to understand that what this device is actually, is the insides of a two-port dumb hub? If that is what it is, then I can understand that.



No, this splitter is not a hub in any sense, it just splits 8 wires at the "incoming" RJ45 jack into two sets of four wires, each set of wires come out of one "outgoing" RJ45 Jack.
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PostPosted: Thu May 24, 2007 3:09 pm    Post subject: Reply with quote Back to top

I guess one of the reasons why people think the RJ45 splitters are only qualified for 10M Ethernet is because these splitters probably were "invented" way before 100base-T existed; when 100base-T came to play, people just started using switches, and RJ45 splitters became an extremely niche option without being paid much attentions, and thus they are just kept being considered as 10M Ethernet only.


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mjstraw
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PostPosted: Fri May 25, 2007 7:45 am    Post subject: Reply with quote Back to top

[quote="navydavy2001]So, am I to understand that what this device is actually, is the insides of a two-port dumb hub? If that is what it is, then I can understand that.[/quote]

Since 10base-T (and 100 for that matter) uses pairs 2 and 3, the splitter passes 2/3 straight thru. It "maps" pairs 1 and 4 to pairs 2/3 on the other "output" jack.

You need to use them in pairs - one at the switch and one out at the devices. Former is a "combiner", latter a "splitter" (same device, tho)

Here's a link to the Hubbell product:

http://www.hubbellcatalog.com/hubbellpremise/datasheet.asp?PN=BR851D&FAM=Jacks&P=4605,389,139

One nice thing about the Hubbell model is that it's male-female-female which lets you plug it directly into the switch (wall jack at the other end) saving you two patch cords over a model that is female all around.

They aren't cheap. And with the price of a 5-port 10/100 switch I'd probably get a switch instead (at least for home use). I think they're giving 5-port switches away in cereal boxes, aren't they? :-)

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PostPosted: Fri May 25, 2007 10:02 am    Post subject: Reply with quote Back to top

mjstraw wrote:


Here's a link to the Hubbell product:

http://www.hubbellcatalog.com/hubbellpremise/datasheet.asp?PN=BR851D&FAM=Jacks&P=4605,389,139

They aren't cheap. And with the price of a 5-port 10/100 switch I'd probably get a switch instead (at least for home use). I think they're giving 5-port switches away in cereal boxes, aren't they? Smile

Mark


Thanks for the link. I was googling it but didn't find one. It is much more expensive than what I am selling for ($4.59 for two). Interestingly, in hubbell's specification section, it says it's splitter is 10/100Base-T compliant.

As I said, this sort of devices have been just niche ones, and I agree that most people would just use a 5-port "dumb" Ethernet switch that could buy for less than $10.

However, now I see a new use for such device, that is, it provides a simple way to separate traffic between an IP phone and a PC. Of course, you can setup a VLAN in a switch to separate traffic, but then you need to have a more expensive VLAN enabled switch, and the worse is that many people simply have no clue how to setup VLANs.

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PostPosted: Fri May 25, 2007 10:23 am    Post subject: Reply with quote Back to top

and they're wrong, too.

Mark
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