Paladin Roaming

M66-50 M66-25

Mini 66-type punchdown blocks come in two main types: The M66-25 which provides four connections on 25 pairs; and the M66-50, also known as a split-50, which provides two connections on 50 pairs. Above is a picture of both. On the left is a split-50. It is being used as a demarcation point between the Avaya equipment that is maintained by Avaya, and my wiring which I maintain. They connect on the left, I connect my cross connect on the right, and the demarcation is a pair of removable/replaceable bridge clips.

If you look closely you can see that on the split-50 the left two lugs are notched to be connected from the left, the right two are notched to be connected from the right. The left and right pairs are separate. The M66-50 is used to connect ONE thing to ONE thing.

The M66-25 block, on the right, has all four lugs made from a single piece of metal. The leftmost lug is notched to be connected from the left. The right three lugs are notched to be connected from the right. This allows multiple connections. ONE thing may be connected to one, two, or three things. Such as connecting the Avaya switch to a telephone set AND a monitoring circuit.

But......

15 months ago I had this Avaya system installed in the '41 building. (Picture on the Left.) It moved to the '81 building. Since the BackBoard was already cabled, I unmounted it from 21241 2.1, with cables still attached, and remounted it in the 12181-1.1. (Picture on the right, except that some blocks have been moved by unauthorized persons.)

The day Avaya came out to connect their cables I was at 911 school. I was not there to supervise. I had the UPS beside their box, ready to provide AC power. I had the fiber connections to the Cisco 8540's coming out of an innerduct next to the cables from the backboard.

But they added four more cards and ran four more cables.

Rather than use their own split-50's, they grabbed the M66-25's that I had on MY backboard for me to tie MY cables onto and used them.

This accomplished two things. I am short four M66-25 blocks. And I have NO DEMARCATION between the Avaya equipment and my wiring.

Avaya, would you mind coming back to fix your mistakes, and give my my blocks back?

Posted by at October 24, 2005 09:59 AM