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#568464 03/17/14 09:57 PM
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Well, I finally got my 551C hooked up and was able to find a couple boxes of 1A2 stuff, none of which I think I can use.
I just found something on the internet that says the only line cards you can use in a 551C are the 400, 401, 415, and 467. Is that true?
Can someone remind me of the difference between the 401A and 401B?
What does a 415 card do? The BSP says you can only use one per KSU. Why? Not that I would probably have need of more than one.
What does a 403 card do and could it be used in my 551C?


Bill
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phonenut260 #568466 03/17/14 10:07 PM
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If I remember correctly the 415 was a ring down card for special point to point circuits..sort of a hotline. But it has been a while. A LONG while.


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phonenut260 #568481 03/18/14 09:01 AM
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OK. One at a time...

1. I don't think that's exactly correct, but I'll have to check.
2. A 401A requires an "A" lead to function. A 401B does not.
3. Dave is correct. A 415 is an automatic hotline card. You need an identical card at the far end. Pick up the line and the far end rings. Unless it has been (unofficially) modified it will only work over copper, not carrier.
4. A 403 card is an isolator to allow Music on Hold to be used on more then one line (otherwise you get cross talk). I'm not sure if it could be used in a 551, but I believe so.

A 551 has 18 pin card slots. Some cards (414 manual ring down for example) looked like they were the same size as a 400 but were actually 20 pin.

Sam


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phonenut260 #568539 03/18/14 10:23 PM
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Phonut:

Have you read BSP 518-215-400? That's where the answers are.

You can Google it.


Arthur P. Bloom
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phonenut260 #568561 03/19/14 10:53 AM
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Arthur -

Thanks for including the link to the BSP. It does indeed answer every question.

Sam


"Where are we going and why are we in this hand basket?"
phonenut260 #568634 03/19/14 09:21 PM
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I looked at the 518-215-407 BSP. That's what raised some of the above questions. I have not looked at the xxx-400 BSP in its entirety but I did not see anything about a 403 KTU even when I Googled it so thanks for explaining that to me.
I have a couple follow-up questions:
1. Do you just insert a Music-on-hold card in one of the line card slots and you get MOH? Say you inserted it in line 4's slot: do you get MOH on the other three lines if you push the Hold button, or do you push line 4 to get MOH?
2. BSP xxxxx-407 says a maximum of 5 stations can be wired directly to KSU (and I understand that.) "If more are required, use loop through terminations or provide destribution facilities." That I don't understand. Is the connector block in the KSU a different type than that a normal 66? It appears to me in my limited knowledge that the connector block in the KSU is a special 66 block. Is that true?


Bill
phonenut260 #568637 03/19/14 09:50 PM
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1. The 451 KTu is the MOH unit, but it cannot be used in a 551 KSU. It does not work the way you imagine.

2. The loop-thru method means that the 5 rows of output pins can be used to terminate one double-ended (female/female) station cable, with the wires punched down using the "other end" of the punch-down tool. (the blade can be reversed in the handle to allow a wire to be terminated and then head off to other points, without cutting it off). It assumes that one, double-ended cable can be run to two (exactly the right) locations in a wiring plan, with no slack, and look like someone sane did it. This method assumes ten stations, two at a time, at the opposite ends of 5 cables.

This suggested cabling method ranks among what is one of the stupidest suggestions ever found in a Bell System practice. Don't even think of doing it that way. Use one 25-pair stub cable, cut down in the KSU, and terminate it on a 66B25 block, outside the KSU. Then terminate your station cables, two per block, on 66M50 blocks. Run cross-connections from the feed block to the station blocks. That will allow you to energize ten stations.

The shoebox cabinet is just too small to do any neat wiring work inside, unless you are just using it for a demo, feeding one or two phones.


Arthur P. Bloom
"30 years of faithful service...15 years on hold"

phonenut260 #568640 03/19/14 10:17 PM
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Thank you Arthur. I will try that. I did get the KSU with two cables already attached just so I could quickly find out if it worked. I then had another cable punched down which I now regret. My goal was to have a plug 'n' play KSU, that if I so desired, remove it and hang another KSU. I have a 66 connecting block with about 5 male amphenol plugs attached to it. Do you have any idea what these could be used for?


Bill
phonenut260 #568641 03/19/14 10:25 PM
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Pretty much need a picture to determine what you have.


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phonenut260 #568647 03/19/14 11:15 PM
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A 403 card was an ITT product, not WE. As I recall, you fed music in from a source (tape deck, fm radio, etc) in on pins 3&18 and looped it (unless it was already looped) to all the lines you wanted MOH on. Some line cards (Sanbar 4200 maybe?) did not need a 403. Others did. Pins 3&18 often came with A Battery wired to it (401, 415 and other cards required it). If it was there you had to remove it.

I'm really digging deep for this stuff, so forgive any errors.

Sam


"Where are we going and why are we in this hand basket?"
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