1A2

[capitol31]

I'm servicing a 1A2 Key Telephone Unit and I am suspecting that there is a bad CO/PBX line card. The card is a 400H KTU CO/PBX Line Card CKT. Does anyone know where I can purchase this card. I looked on the internet and can't find it. I've seen cards like 400E & 400D, but not 400H. Any help would be much appreciated.
Thanks,
Matt

 

[pansophic]

I don't remember what the H bought you that the E and D didn't have.

When you move the card from one slot to another, does it follow the card or the slot?

This security line card should be a functional equivalent for the 400H. The biggest difference is that it actually disconnects the talk path at the line card when the phone is on-hook or on hold.

http://www.ex-bar.com/new_page_1.htm

pansophic

 

[bobsou]

if you can't find a 400H you can use a D or E no differences just later release

 

[PERRYPJ]

any of the 400 line cards will work, the higher the alpha character the latest the version. but you shouldn't have any trouble with a d or e version

OLD ROLMEN WORKING ON NORTELS

 

[SYQUEST]

There are some differences between the versions of the 400 KTU line card depending upon the manufacturer. The 400H is the last one made by Western Electric and has less features than previous versions and was a complete redesign since it used triacs and IC chips. It only had 2 reed relays. When you go off-hook on a line using a 400H, you could not put the line on HOLD unless you paused for 2 seconds or the HOLD would not work. I liked the WECO 400G the best. WECO did make a 400E in 1970 but the production was limited for BTL evaluation only. It was the first to have IC chip control circuitry. The WECO 400D had numerous series versions. Bell Labs kept coming up with changes, modifications and fixes to solve field problems that kept poping up. That is why they had so many. The ITT K400D was much more stable and the AECO 1400 series always seem to be going bad. One specific thing about both WECO 400D and K400D, is that the power supply needed an earth ground or the ringup ckt would not work. This was true for all KTU line cards of that design. The ITT K400E was a very good design. It is extremely flexible with all its options although the ring timeout was the same as the K400D, you could add a resistor to make it the same as the WECO 400G and 400H.

There are some sources that still sell 1A2 equipment, I will add another post to this thread after I check to see who still does on a list I have.

When you are servicing 1A2, you can swap line cards to troubleshoot, but you should verify the strapping block, etc to make sure of the options selected when doing so. Most of the time this is not an issue, but it can be if the customer has something special on one line.

Hope this helps!

....JIM....

 

[SYQUEST]

Here are some possible sources for 1A2 key telephone equipment:

http://www.tele-systems.com

800-311-9830

http://www.tel-part.com

800-275-8355
Cheap Talk 800-955-1881

http://www.mmcomm.com

800-460-2216
Southern Telecom Distr 800-752-1107

Some of these places have different items from telsets to KSUs to KTUs, etc.

Hope this helps!
....JIM....

 

[capitol31]

Thanks for all the feedback guys. It definately helped me better understand the system and card types.

 

[hdingman]

ITT and Stromberg (S-C) made a K400H that was essentially a K400E with Auto Re-ring on Hold. It's a common feature now on most systems (Hold callback time) but it was pretty fancy in its day.

You can probably use a 400D or 400E with no problem, just that it won't ring back if you leave a held call too long. ITT 400E & 400H had Music-on-hold input on 3 and 18, used K406 isolator (a 20-pin card) to produce 6 isolated audio outputs from one music source. 400D had no music input.

If you don't use K406, the held calls can talk to each other over the music-on-hold if they shout. Probably not a big deal, but once in a while someone would complain.

Still have a bunch of 1A2 stuff in a box with a lot of dust on it. Not much call for it anymore.

Howard Dingman
Pro-Tel Communications
Endicott, NY

 

[SYQUEST]

The music-on-hold buffer KTU from ITT was a K403 type, I believe and the S-C line card was an S-C400F series that had a 'held recall' feature and MOH options. S-C never made a 400H KTU that I recall and neither did ITT. The 1A2 from WECO did not use pins 3 and 18 for MOH. These pins had talk battery on them for the manual intercom KTU, 401A. All their KSUs that had MOH capability used a buffer style, the 451B KTU, that worked with the hold bridge and was wired thru one side of the loop. This was primarily on the COMKEY systems and it was not compatable with the 400H KTU according to the BSPs. The later 498A KTU buffer did support all the WECO line cards for MOH and could be wired into all the different KSUs maintaining a balanced loop(no crosstalk).

Without the buffer card, K403, you can have some bad crosstalk problems, so you really don't want to do it that way if you were adding MOH.

Hopefully this clarifies some of the detail.

....JIM....

 

[PhoneGuy2000]

I thought I knew a lot about 1A2 but you guys put me to shame....

kudos

 

[MonkAZ5]

Here is one for you to ponder. I have a PEI (Plant Equip Inc) 1A2 system. I would like to put MOH on the system. I have 400E cards. Can I do it or do I need different cards.

Mike

 

[SYQUEST]

Hi MonkAZ5,

Which PEI KSU panels are you using? Are the 400Es PEI or are they ITT or AECO line cards? Or something else....

PEI has manufactured a variety of panels over the years. I have a little bit of info in an old PEI catalogue circa 1985. So please be more specific and I'll see what I can find.

....JIM....

 

[ISDNman]

There are a few sources for 1A2 stuff listed here. Many of them don't show the 1A2 stuff on their web sites but if you call them they have it.

As others have said, most of the lines cards are at least semi-interchangeable, though MOH is a big point of divergence so read the rest of this thread.

good luck

 

[macphoneguy]

for the plant equipment you could generally use almost any of the 400 Series of cards but It's would also Depend as the Plant I've seen locally is "Skinnier" in Height i.e. 2 of the plant specific cards could go where 1 of the ITT 400 D/E/F series would go, and like the previous poster mentioned the eariler cards did not have the options like MOH,

 

[hdingman]

The H's we used to get had auto-rering on hold after 1 minute with wink/flash to identify rering lines. Just one of the feature things. D's and E's couldn't do that, but did support MOH. All interchangeable, direct substitute for each other.

Anybody want a WECO "ShoeBox" KSU?

 

[jlshelton]

I used to modify 400D cards for MOH by replacing the hold resistor with an 8ohm-600ohm audio transformer. The 600 ohm side replaced the resistor (which was wire-wound), and looked good to the phone company as a hold load. The 8-ohm side plugged into a radio's earphone jack. (I put small audio jacks on the plastic handle of the KSU card to keep things neat. Cost: under $5 for the modification.

This seemed like really cool stuff back in the day....

 

[MonkAZ5]

Thanks for all the reply's. I think I have a way of getting MOH based on your reply's

Mike

 

[SYQUEST]

MonkAZ5,
If you do have PEI KSUs, they did provide for the MOH feature and may use a specific buffer card for their panels. If you have the practices check there. Otherwise call PEI's customer support for info @ 800-491-1734.

Hope this helps!

....JIM....