2555BM modular wall plug RJ45 for interphone?

[5415551212]

Greetings group I am looking for a BSP on how the 2555BM was connected to a interphone system.
It needs 4 pairs to the phone, so I imagine it used a RJ45 modular wall plug?
the pairs are
pair 1 line 1
pair 2 interphone line
pair 3 signal
pair 4 built in microphone (not the handset one)
Here is an example but this plug only has 2 pairs:

[TelePlay]

Maybe paul_f's site can help.

http://www.paul-f.com/we2500typ.html

Scroll down to the 2555B. There are 3 BSP's given in the right side column.

[5415551212]

thanks, I found one listed on ebay that has lots of photos and it appears they might not have used that modular plug at all.
however the one on ebay appears to be modified by the seller.
https://www.ebay.com/itm/296641592357

[paul-f]

Maybe paul_f's site can help.

http://www.paul-f.com/we2500typ.html

Scroll down to the 2555B. There are 3 BSP's given in the right side column.

To save the scrolling, use this link: http://www.paul-f.com/we2500typ.html#2555

The BSP for Home Interphone Connections is shown under the 2555D. (Haven't seen a reference to a BSP for the 2555B yet, or any modular versions -- but haven't looked too hard.  They may be out there, to be found.)

https://www.telephonecollectors.info/index.php/search?q=512-510-443

It's worth checking the BSPs to determine the differences between the 2555B and D. Also check out documents on the Home Interphone system.

https://www.telephonecollectors.info/index.php/search?q=interphone+connection

https://www.telephonecollectors.info/index.php/search?q=home+interphone

[poplar1]

thanks, I found one listed on ebay that has lots of photos and it appears they might not have used that modular plug at all.
however the one on ebay appears to be modified by the seller.
https://www.ebay.com/itm/296641592357

This model (2555BMP) should have a 4-conductor 523A plug. The local signaling (push down on the line key) is not possible with the 523A plug.

I don't think modular phones were ever used with the Home Interphone, which was already Manufacture Discontinued before the publication of BSP Section
512-510-200, Issue 8, August 1978. Rather, 2 runs of Quad JKT  inside wire were used to provide 4 pairs.

[5415551212]

Thanks for the info Paul!

I don't think modular phones were ever used with the Home Interphone, which was already Manufacture Discontinued before the publication of BSP Section
512-510-200, Issue 8, August 1978.

I know first hand some variant of the 2555 was, as I lived in a house with one and it had a phone just like it in the kitchen.
However I don't remember how it was connected to the 6-pair inside wiring, and it might not have had a interphone microphone in the phone, rather it might have used a 730A  'door' speaker, in that case it might just use a 6-pin 3-pair RJ25.

Also here is one of our old interphone threads that shows a 10 button with a interphone system:
https://www.classicrotaryphones.com/forum/index.php?topic=7356.0

Either way they must have had some way to at least bring the signal button out of the phone so there must be at least a 3-pair wall plug for it?

Cheers
--Stephen

[poplar1]

This model (2555BMP) should have a 4-conductor 523A4 plug. The local signaling (push down on the line key) is not possible with the 523A4 plug (see note from BSP Section 502-533-405, Issue 3, Aug. 1975 -- last attachment below).

[poplar1]

Thanks for the info Paul!
I know first hand some variant of the 2555 was, as I lived in a house with one and it had a phone just like it in the kitchen.
However I don't remember how it was connected to the 6-pair inside wiring, and it might not have had a interphone microphone in the phone, rather it might have used a 730A  'door' speaker, in that case it might just use a 6-pin 3-pair RJ25.

Also here is one of our old interphone threads that shows a 10 button with a interphone system:
https://www.classicrotaryphones.com/forum/index.php?topic=7356.0

Either way they must have had some way to at least bring the signal button out of the phone so there must be at least a 3-pair wall plug for it?

Cheers
--Stephen

The post you referenced has two 1558B sets, not 1555. Are you sure that you didn't have a 2558 instead of a 2555?
Also, the 730A receiver(s) were used only for 1 (or 2) door units; they included the speaker and transmitter since there were no phones (with transmitters installed inside) at the front or back door. The push-button function of the line key disconnected all the 759A loudspeakers (located next to the inside phones) in order to transmit from the 2-line phones to the outside 730As.

[jsowers]

Here's a picture from the only house I have ever seen online with Interphone phones still installed (only two). It looks to be a 2558 but not a modular one. The picture is kind of fuzzy, so it's hard to tell. They have another phone on the kitchen counter, so likely the system was no longer functioning.

Below is a link to the pictures of that house inside. It's at 930 Longbow Rd. in Charlotte, NC and I doubt very seriously if the phones are there now. I was amazed to see them still there in the pics. The other phone is in the bedroom and much more blurry than this one.

Link to see the house. It's a Scholz Mark 58 house. Very mid-century modern.
https://www.realtor.com/realestateandhomes-detail/930-Longbow-Rd_Charlotte_NC_28211_M53715-97000

[5415551212]

The post you referenced has two 1558B sets, not 1555. Are you sure that you didn't have a 2558 instead of a 2555?

No not sure, it looked exactly like what Jonathan just posted in post #8 it was on the kitchen wall right by the back door. I think the 2558 just adds exclusion and A-lead type control which could work with a interphone or the POTS line but I don't think was required.
So I bet it was just hard wired off the speaker.

Also, the 730A receiver(s) were used only for 1 (or 2) door units; they included the speaker and transmitter since there were no phones (with transmitters installed inside) at the front or back door.

Yeah thats the way they are intended, but I am pretty sure the 730A would work in-place of the built in microphone, (same impedance as a internal mic) if mounted along side a 2-line phone.
I'll try it out here before too long, I am presently re-working my system.
I'd like to find a 3-pair 6-pin RJ25 plug (and wall hanger jack)for the 255X series wall phones to be able to use the signal button. (Both my intercom line and my interphone line use the signal button)
I suppose I could just add the outer pins to the plug, its got holes and groves for them.
Thanks and
Cheers 
--Stephen

[5415551212]

Here's a picture from the only house I have ever seen online with Interphone phones still installed (only two). It looks to be a 2558 but not a modular one. The picture is kind of fuzzy, so it's hard to tell. They have another phone on the kitchen counter, so likely the system was no longer functioning.

Below is a link to the pictures of that house inside. It's at 930 Longbow Rd. in Charlotte, NC and I doubt very seriously if the phones are there now. I was amazed to see them still there in the pics. The other phone is in the bedroom and much more blurry than this one.

Wow nice find, I wish we had more pics of interphone systems found in the wild.
I tried to grab the full size image then zoomed in: