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ISDN MPOE Wiring

Posted on 2001-08-11
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Last Modified: 2013-12-29
The local phone co only installed our ISDN to the MPOE
on a NIB with an ADDTRAN that broke out only to the GREEN and RED pair instead of the standard RJ-45 jack.

What is the pin out FROM the GREEN/RED to RJ45?
Is is the 3rd or 4th pair?

From the MPOE to the ISDN TA what is the max resistance
for best performace. I ask this since i think there is a 66 Punch Block in between the MPOE and the TA, and I've heard that bridge clips don't cut it for digital anything.

KNOWN:
ISDN NI                         RJ45 PINOUT
=================================================
                          1 = white/blue
                          2 = blue
T1 = GREEN      ===> ?    3 = white/orange
R1 = RED        ===> ?    4 = orange
                          5 = white/green
                          6 = green
                          7 = white/brown
                          8 = brown

Thanks.
( This site should have a PHYSICS / TECH area for hardware like these questions... )
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Question by:SemperPhi
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by:
lrmoore earned 100 total points
ID: 6377315
Try Green --> 4
    Red --> 5

Standard ISDN wall-jack to modem is usually Rj-11 or standard phone line cable. If you plug a 2-wire phone plug into an RJ-45 jack, the two pins will contact pins 4 and 5 on the RJ45.
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by:SemperPhi
ID: 6378060
The TA is a 3com/USR ISDN modem with a RJ45 Jack on the back and poor documentation on the cd.
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by:SemperPhi
ID: 6378573
and no, the standard jack is a RJ31X for ISDN i think...
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by:SemperPhi
ID: 6383774
Well you got lucky,  maybe it should have been something else like RJ11/12, but the Pac Bell tech never finsihed it at the MPOE.

The 3COM/USR TA has an RJ31X/45 on the back and the 31X specs are for the 1/8 and 4/5 pairs. The RJ11 plug for some reason doesn't make good contact on the USR TA. So I had to wire the inside jack to the MPOE with a 45 jack and use a 8P8C (RJ45) straight through cable...of which the center pairs I made live. So I got lucky too...

Now if they only made a REFERECE of all these answered questions on this site for a point fee, now that would be an idea. :-)

Thanks.
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