Author Topic: AT&T Merlin Phone System (PABX) and Telephone Sets  (Read 16657 times)

Offline AE_Collector

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #45 on: June 03, 2013, 11:58:41 AM »
Since they need 4 pair/8 conductor set cords you then have to figure out if they use 568A data, 568B data or USOC cords. I would bet USOC since the system likely predates the 568A/B data standards.
USOC standard cords quite likely have the usual set cord colored leads (green, red, black, yellow, white, blue, brown, slate) and has the first pair in the centre of the plug, and then the subsequent pairs continue to be split one lead to each side around the first pair. The same as a normal two pair set cord but with two more pairs. 568A and B data standards are different again and typically the data cords have the 4 pair cable pair colors (blue, orange, green & brown) in the cord.

Terry

Offline poplar1

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #46 on: June 03, 2013, 06:11:32 PM »
I'd have to check but I don't think a 103A baseboard jack is USOC.
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Offline Nilsog

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #47 on: June 03, 2013, 06:23:06 PM »
Thanks, guys.
Ken

Offline AE_Collector

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #48 on: June 03, 2013, 06:34:34 PM »
I'd have to check but I don't think a 103A baseboard jack is USOC.

What is a 103A jack? If for the Merlin system, what else would it be unless it is completely different from normal RJ standard jacks?

Terry

Offline G-Man

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #49 on: June 03, 2013, 07:08:47 PM »
The Western Electric 8P8C data wiring scheme (TIA 568B) is the most prevalent in the United States and was used with the early Merlin systems. The 568B scheme also provides for backward compatibility of USOC 6P/6C pin-outs when it was desired to use the data cabling for regular telephone usage.

However, TIA 568A will also work since the only difference between the two standards is the swapping of the orange and green conductors of pairs two (pins 1-2) and three (pins 3-6). In other words, all of the pins are wired straight through, just with conductors that have different colors.

Here is a visual representation of the two schemes:

                   http://www.utm.edu/staff/leeb/568/568.htm




« Last Edit: June 03, 2013, 07:16:35 PM by G-Man »

Offline AE_Collector

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #50 on: June 04, 2013, 12:07:41 AM »
Wouldn't it be 568A that is somewhat backwards compatible as it has the blue AND the orange pairs in the correct location where as 568B only has the blue pair in the correct location?

568A seems to be the most prevalent in Canada. As you say G-man, it doesn't matter unless one end is tied down on blocks of some sort.

We recently had a whole bunch of 4 line KSU-less office phones to install in different locations. Many of the locations were installed on existing 4 pair runs originally used for data. Most of our installers knew enough to cut patch cords in half to plug into the data jack and they put double surface jacks on the cut end with 2 pairs to each jack. These phones had to have 2 - 2 pair set cords. All worked except I got most of the repair calls once some customers found line 2 and 3 reversed where the installer didn't notice the patch cords he cut were color coded for 568B as our data jacks are virtually always 568A.

Terry
« Last Edit: June 04, 2013, 12:09:18 AM by AE_Collector »

Offline Dave203

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Re: AT&T Merlin Phone System (PABX) and Telephone Sets
« Reply #51 on: August 27, 2013, 04:29:58 PM »
I am using the Merlin 820D at home rite now with 1 Comcast voice line and 2addon lines from an old sun rocket VoIP box. It's voice service is provided by "whistle phone" and I had to figure out how to configure it myself. They give me free calls to 800 numbers and other whistle customers. Plus free 20 min to call any US number. Its very limited but its free to play with and I get a real phone number out of the deal.

I have a Merlin 10btn hi-fi phone on my desk and 5btn in the kitchen. And maybe about 4 other old Merlin phones that don't work or have issues. One receiver has the metal grill like you describe.. I'd like to give some of this stuff away if anyone has an interest in it.

I also have an older 410 with feature package 1 or 2. It redlighted on me a few times so I upgraded to the 820D. Then I upgraded to the Partner 103G4 and fell in love. So many options and I can finally connect any standard phones and dial 9 to get out and if your using system phones caller ID does work.
 :)
I'd like to start using my Partner system again but the power supply on mine went and I'm having trouble finding a new/used one for a reasonable price. If anybody knows of one please please let me know. They go for about 70 bucks on eBay and that's a little high for me at the moment.

But yea I've been a big fan of the old black n gray Merlin phones for years. Love the red+green line lights and ringer tones and music on hold. Still missing my partner system so if I transfer a call to another phone the person on hold hears the ringing on their end too.
I'd post pictures if anyone is interested in viewing my messy setup or the stuff I need to part with. Let me know.
-DaveCT