Merlin ATL sets

[aussie88]

I thought that the merlin ATL sets could live off of 3 pairs. And that the 4th pair was only for OHVA. Well, I tried using a line cord with only three pairs and the phone was non functional. I am using the phone with a 820D2.

Any Logical Explanitions??

Thanks,

Austin Gastrock

 

[TouchToneTommy]

Was it an 8-pin cord with 3 pairs on 1&2, 3&6 and 4&5? Because it's the 4th pair on pins 7&8 that is used for OHVA. A standard 3-pair (6-conductor) line cord will fit in the jack, but it will center itself in there, and connect to pins 2-3-4-5-6

 

[aussie88]

yes, it was a standard 3 pair cord. No luck.

Is it my phone??

Thanks,

Austin

 

[jinxs]

O.k., quick explanation on the Marlin phones(classic merlin)..the first pair(white/blue) is used for normal communication..basically it is your talk path....the second pair(white oarnge) is used for data communication..light the lights when the need to be lit, so on and so forth..the third pair(white/green) is used for the power to the lights....the forth pair(white/brown) is used for voice announce on the classic merlin, somehow they elimated the need for the 4th pair on the legend. The phone will work without the 1st and 4th pair. Hope this helps.

 

[jlshelton]

Earlier messages may not have been clear. An 8 pin cable has wires 1, 2, 3, 4, 5, 6, 7, and 8. A 6 pin cable plugged into an 8 pin jack only connects pins 2, 3, 4, 5, 6, & 7.

Thus, you would be missing pins 1 and 8.
On the ATL phones,
Pin 1 is part of the control pair (pins 1&2)
Pin 8 is part of the secondary voice pair (pins 7&8)

So, by missing pin 1, you won't get the control signals, rendering the phone useless.

 

[aussie88]

Ok, because my curiosity just drove me insane, I took a 3 pair line cord, cut off both ends. and crimped an 8 pin plug on each end crimping all wires except the brown pair. well, it still did not work!! Oh well, it was worth a try. Thanks for your help,

Austin

 

[TouchToneTommy]

Crimp it on, but don't center the cord in the plug. Slide it all the way to the left, so that instead of missing one pin at each side, you miss both pins at the right side (7 and 8)

 

[SYQUEST]

Is there a reference somewhere that spells out the lead/pair - names/designations for MLX, ATL, ETR phones, and CTI link hardware? I have looked in the various practices but have not found any definitions or explanations, except for the MLX for the W-BR pair as aux power for MFM or adjuncts. I had raised this question in a past thread, but never got a clear answer or it was ignored. The Legend system I am currently servicing has MLX phones and they all have 2-pair line cords except for the MLX20L for the console which uses all 8 conductors.

One old reference I found was for the MET set used on the Horizon and Dimension systems, since the MET set was the forerunner of hybrid sets in the old Bell System. Here are the pin assignments:
5 talk tip (TT)
4 talk ring (TR)
1 data button tip (BT)
2 data button ring (BR)
3 auxiliary tip (AT)
6 auxiliary ring (AR)
7 data lamp tip (LT)
8 data lamp ring (LR)

Also I know the Partner uses 2-pair line cords on the MLS phones, which pins 5/4 for talk and 3/6 for control in reference to 8-position hardware.

Any ideas or sources I could check out??

Thanks for your patience!
....JIM.....

 

[ken07734]

When you make your own cable you should check it by plugging it into the port, I can tell you that you will need pins, 1,2,3,6,4,5. 1+2 should be orange, 3+6 should be green and 4+5 should be blue when you make the cable. 7+8 are the brown pair for voice over.

I have cripped this and it works on my legend with an atl set.

good luck.

 

[aussie88]

okay, I crimped on the plug and here are the results. 3 pairs would work fine for ATL non-display sets. But if you are running a merlin plus or a merlin II with display sets, that is a differant story. I believe the brown pair is used to send data to the display phone. Because when I used the 6 wire cord on the BIS 34-d, The display did not show anything except for the date or the time, I did not even show numbers when I punched them. Someone told me that the partner ETR sets would work on an ATL port. I think they are full of $*!#.

Thanks again for the answers.

Austin Gastrock

 

[kristiandg]

They may actually be right. System 25's and such could take pretty much any 4 or 6 wire phone (including older Horizon and Dimention phones). You just needed to create aliases for them.

Kris

 

[DaVinici]

Why don't you just get a std merlin 4pr mt cord. I can't
believe anybody would waste the time dealing with pin outs
or trying to make a 3 pr rj11 plug work w/ ATL sets.
Just for the info..Horizon Met sets used the 1st, 2nd& 4th
pairs of a Rj45 type mt cord. Yet the same Met set on a
System 25 used the 1st, 2nd & 3rd pair. go figure

kristiandg
Please explain what do you mean by creating "aliases for
them".System 25's never could use a 2 pair multi-button set.