atcomsystems.ca/forum Forums Other TDM Phone Systems 1A2 and Comkey Telephones & Systems 513/514 Mounting Straps

I purchased a 515 KSU about a month or so ago. It came out of a small office building, and the 514 was electrically but not mechanically connected to the 513. The 513/515 BSP mentions rear-mounted straps are used to physically attach the 514 to the 513 side, but I'm not seeing any mounting straps among the miscellaneous hardware bits I got with the KSU.

Any idea what the mounting hardware looks like, and does anyone have extra straps? The BSP refers to it as part number 834056053 (P-40V605). Couldn't turn up any reference to that part online.

The part number that you refer is known as a comcode, A.K.A: The magical nine digits that could get you anything you needed back in the day. A comcode beginning with any digit above 1 was usually for a part that was made by an outside supplier for Western Electric.

'P' parts are nearly impossible to find these days. They were even impossible to get back when they were available through Bell System supply channels. They were usually referred to as a kit of parts, and as our friend here Arthur would say, they are and were made of "unobtainium".

Sorry for the bad news, but unless you find an extremely informed collector who is willing to part with this, you might be on your own to fabricate something.

Figured it might be a shot in the dark. If I had a picture of what the original part looked like, fabricating one would be easier. Judging from the mounting holes, it doesn't look like the mounting straps would be more complicated than a set of steel/aluminum bars.

LOL, I had to pull up the BSP to see what you were talking about as I have never seen (or thought of) the 513 and 514 as separate units. From a quick scan of the BSP, it looks like the hardware was shipped with the 514, and was probably never available as aa order-able item.

What's the difference between 513, 514, and 515? Got a link to the BSP?

I found it google'ing for 513 KSU:

513-514-515 BSB

As I understand it, the 515 KSU is a combination of the 513 and the 514. The 513 is the base unit which has the interrupter, power supply, and space for one 8-inch KTU and six 4-inch KTUs (or eight 4-inch KTUs total). The 514 is an add-on that provides space for two 8-inch KTUs and four 4-inch KTUs (or eight 4-inch KTUs total).

That being said, my KSU was light on cards when I got it. It had a 407B dial Issue 7 dial intercom (neat!) and two 400D Issue 15 cards. Given that someone went to the trouble of installing a 515, I'm guessing most of the line cards were removed at some point. I'll likely never use the 407B, since I'll be running everything behind the Legend.

Well, if you're feeling bold, you could always add a Touch Tone adapter to the 407. You could also replace the 407 card with a 494A if you can find one. It was their 100% solid state rotary/tone slide-in replacement for it and the 424C (19 station version).

You don't really need the strap. Just mount the two "halves" of the 515 securely on the backboard, butting up closely, in a way that seems correct.

The hardware that you need is a flat piece of steel, the length of which is the height of the two halves. It is about 1.5" wide, and slides down through the "tunnels" and ties the two halves together. Picture a steel belt going through alternating "belt loops."