Chat Now
T Adapter 8P8C - 1F/2F
In Stock This item should ship today (11/27/2015) if ordered within 11 hours 52 minutes

0.17 lbs

Flat Rate Shipping Prices

  • 0-3lbs- $4.99

T Adapter 8P8C - 1F/2F

This splitter is primarily intended for use with older 4-line analog phone systems, which use 8P8C (RJ45) cables. This will split the lines, allowing two such phones to be connected to the same input line.

Note that this will NOT work with Ethernet/LAN cables. If you wish to connect two or more Ethernet lines to the same source, please check out our line of Network Switches.

Support Files:

11 Reviews

60% of the reviewers recommend this product


The 2nd batch of ordered

  • Mark W,
  •  Shepherdstown, WV 
  • 5/23/2015 6:14:59 PM

Pros: all tested good except for one which had pin 7 crimped improperly on one port. 9.6/10 good.
this is not a problem as I will just use that one for my little project ( see previous comment ).

Cons: I found one of them to have no continuity on one port/pin7. it seems to me that the wire was not stripped before it was crimped or the wire was pulled back in the insulation and it was not stripped back enough or caught by quality control. again this is not a problem for what I will be using it for.

for the project that I will be doing this is not a problem as I did not plan to use pin 7 once I rewire it.
See my previous comment for further information as to what I am planning ( insert evil scientists laugh here.... )

Was this review helpful to you?

i didn't get enough of them?

  • Mark W,
  •  Shepherdstown, WV 
  • 5/19/2015 9:15:15 PM

Pros: Good quality, sturdy construction, better than the RJ-11/14 version.
wired correctly! ( at least for 8 pin Ethernet standards ).

Cons: this will not, I repeat "NOT" let you plug 2 computers in to one port (....) if you want to do that you'll need to buy a switch ( a hub is outdated but will sort of work, if you have really! slow Internet. do yourself a favor and get a switch. i think the bare-bones basic one is $10 over here on this site, I've only ever gotten the gigabit ones and they work great.)

I purchased 2 of these for a project, before I started the project somebody asked me if I had any Ethernet splitters.

for starters Ethernet "CANNOT" be split like this, it's like hooking up 3 tin cans on one string!

these are technically 8 pin splitters, used to split 1 cord with 4 pairs carrying 4 lines, to a 4 line telephone ( yeah what's that, I don't even know ). over time various other devices have re-purposed the 8 pin cable for other uses thus making lots of headaches for various people (ME).

this person I know has a Behringer POWERPLAY P16-M Digital Personal Mixer system and the distributor for the system has 6 ports. the problem is if you need more than 6 ports you have to…
(A.) get the expansion distributor which takes 1 and makes 8. ( and a lot more to set up ).
(B.) daisy-chain and use a separate power adapter. ( one more power adapter to find a place to plug in, defeating the " it powers itself" system ).

so I'm sitting here with 6 ports and 7 band members… what to do?
when the idea of using a splitter was tossed into the conversation. my original thought was that it used a ( proprietary! ) digital system similar to Ethernet and that it would not work, the other competing idea was let's try it and see if it works.
and guess what "IT WORKS", I had 2 boxes plugged into one port with a splitter both getting power and audio for 2-3hrs and no ill affects!!!!!!!!!!
Now I would not recommend doing this for more than 1 or 2 splits, but if you have to drag out the extra distributor for one band member I say do it!
I even tried splitting one feed line by 3 and it worked, although I was a little leery of it.
Now that's called hardware hacking and nowhere in the manual or otherwise have I found anything mentioning this.

The "my" project?
10/100 Ethernet only uses 2 out of 4 pairs, and many clever people realized those 2 pairs that are not being used can be re-purposed for other uses such as Audio, Video, Telephone, Power ( and my favorite ) a 2nd Ethernet channel that can be split off to a 2nd computer. but of course this 1st requires 2 ports on a switch get combined then sent to their destination and then split apart again. ( useful if you really don't want to climb up in the ceiling to run another cable, and you don't need gigabit ) this site does indeed sell 2 variations of this however they cost a lot more and are a lot Bulkier.
so I said to myself why couldn't I just use this little splitter with a slight modification, well my 1st problem was I need to get some of these as I don't have any. there is no reason why this shouldn't work it's just a matter of reconfiguring the pin-out, which if you're clever enough to figure out on your own you should be able to do.

so I'm off to purchase 10 more.

Was this review helpful to you?

T Adapter 8P8C 1F/2F

  • johnlee,
  •  Shreveport, LA 
  • 4/19/2015 5:30:56 PM

Pros: Prompt service and excellent price

Cons: None

Unlike some of the other reviewers, I have nothing negative to say about this product. Perhaps the manufacturer corrected the flaws before I bought mine.

I bought two of these T adapters to use with our new RaceAmerica autocross timing equipment one to use and one for a spare. The output of the timing console has to be split to feed both the large digit time display and the scoring computer. I used one of the adapters today for the first time and it worked perfectly right out of the package.

At our next event, I plan to use the spare adapter to see if it works as well as the other one did today.

Over the past few years I've bought several items from Monoprice and I've never been disappointed.

Was this review helpful to you?

Wrong product

  • Philip Carbo,
  •  Mineola, NY 
  • 2/11/2014 1:03:11 PM

Cons: I searched for RJ45 Lan splitter via website. Site returned PIC: 7294 with no definition of application. Assuming it was Ethernet Lan splitter, I ordered and received six of them. When connected to two devices via common CAT 5 cable they failed. When tested for connectivity I found them to be full four pair splitters, not Pairs 2&3 straight through and pairs 1&4 presented at positions 2&3.

by Monoprice Administrator
Hello Philip,

Thank you for your review and my apologies for the issues you have experienced with PID 7294.A shame this didn't work out for your needs.. Now I should mention that this will not work with Ethernet/LAN cables. If you wish to connect two or more Ethernet lines to the same source, please check out our network switches such as PID 7857. Sorry again for any inconvenience this may have caused. Should you have any questions, feel free to contact us!

Jonathan Arteaga
Tech Support Associate
Was this review helpful to you?

Complete junk after they switched to the one-part connection

  • David,
  •  Spring, TX 
  • 11/29/2011 8:36:39 PM

Pros: I'll get a refund on them.

Cons: It wasted my time and now I have to find somewhere else to purchase them.

As mentioned by Joseph Candelora's review - the older model of the three way female coupler which contained individual wires inside was perfect - I know, I've purchased hundreds and hundreds of them. Monoprice has switched to a new "one part" internal "junction" and as a result of what appears to be poor manufacturing, the pins don't line up all the time.

Monoprice - Please, please, please do not sell any more of this item as it could result in some VERY expensive damage as a result of crossed wires when used with power over ethernet or other power carrying circuits.

by Monoprice Administrator
Hello David,

Thank you for your review and the video you have posted on this item. I do understand that we do get newer batches or updated revisions of items and may not be aware of issues like this the so thank you for pointing this out. I will be escalating this complaint to a higher priority so it can be investigated properly and notify our suppliers.

Thank you for your feedback and concerns David and we really do appreciate your video review so it can be forwarded easily.


John Lingo
Tech Support
Was this review helpful to you?
Tax and shipping will be calculated at checkout