MDF cross connection block test clips

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Does anyone know of test clips for the 100 pair MDF type cross connection
blocks?  I've seen some for type 66 blocks, but I'm not sure if they'd be
suitable.

tnx jk



Re: MDF cross connection block test clips


If you're talking a 110 style cross connect block, the most you're going
to get is 25 pair.  If so, Siemon used to have a 25pair 110 to go with
their 66, but it's gone.  I had to get some from a specialty house, but
they were available through Anixter.

LINK:   http://www.independenttech.com/ITC-3012.htm



James Knott wrote:
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Re: MDF cross connection block test clips


Justin wrote:

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What I'm referring to, is the 100 pair cross connection blocks, used on the
main distribution frame in a central office.  They're nothing like a 110
block.  I suspect the pins may be similar to a 66 block, but as I don't
have one handy for comparison, I can't say for certain.  The reason I need
this, is I'm working on some dslam shelves for an ISP, co-located in a
telephone company's offices.  One end of the cables are terminated in 32
pair connectors, that plug into the dslam cards, but the other end, are
connected to those 100 pair blocks, located on the phone company's frame.
The proper clips would make it a lot easier to test the cables.




Re: MDF cross connection block test clips


James Knott wrote:
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hmmm...well the only thing I can think they would be are 66 blocks or
binding post (twist on) type.  Those I'm not very familiar with other
than knowing they exist.


Re: MDF cross connection block test clips


Justin wrote:

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These are fairly large blocks, with 100 pairs of punch down terminals on the
front and either wire wrap or connectors for the equipment cables on the
back.  You'll generally find them only in central offices, where high pair
density is desired.  On larger frames, they'll be arranged vertically on
one side of the frame and horizonally on the other.  Smaller frames will
usually have only the vertical blocks on one side.  When mounted on the
frame, they fit right next to one another.  They also have a hinged cover.
The cross connect wires come out of the side, and travel through rings
attached to the frame.  The rings are installed on the back or horizontal
side of the frame.








Re: MDF cross connection block test clips


James,

I think I have seen these blocks in a fashion that they have a blue and
white checkerboard pattern for counting the pins. I don't recall if a
"pair" of pins was one above the other, like a 66 type, or were side by
side.  In any case you should be able to make up a test cord using
something like a Panduit Female disconnect lug. Try searching for this
Panduit part number to see it: DNF18-187-C. These lugs are used typically
for connecting wires to circuit boards or small batteries like in a
security system.

My only other suggestion is to contact the manufacturer of the block to
see if they have something available.

-------------------------------------
James Knott wrote:

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Re: MDF cross connection block test clips


James Knott wrote:

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Regular 110 or disconnect 110? Seriously doubt about regular, but for
110-type disconnects AT&T used to have test clip that you could plug into
the same slot you took your disconnect divider from. The clips were single
pair, but with a little bit of craftiness ;-) you could put 25 of them
together. Just joking, you obviously test each pair separately 'cause it's
hard to get any useable result for 25 pairs at once without a specialized
circuit testing gizmo

OTOH, they made single-pair and 25-pair disconnect blocks, so maybe
somewhere in that Western Electric structure there could have existed such
gizmo that tested 25 pairs at once. I'm still struggling to understand why
you would need such test other than for initial post-installation backbone
test.

BTW, if you were looking for a regular 110-block clip, make sure you
realize that you cannot plug anything OVER existing cross-connect wire
(110 IDC allows only one connection), so you still can only test an empty
block/cable that's not in service.

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