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1. Open the unit by gently inserting a screwdriver into the special
pry slot on the plastic case (below). Don't worry about
breaking the plastic, but make sure that you do not insert the
screwdriver more than 1/4” into the enclosure, as you may
damage the unit.
Once the unit has been opened, you will be able to see the
terminal blocks located at the rear of the PC board.
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
3. Strip back the insulation on each of the 2 twisted pair wires
about .25”.
4. Connect one pair of wires to the two XMT (transmit) poles on
the terminal block. The Model 1040 is not polarity sensitive,
so either wire may connect to either pole.
5. Connect the other pair of wires to the two RCV (receive) poles
on the terminal block.
Ultimately, you will want to construct a two-pair crossover
cable that makes a connection with the two Model 1040s as
shown below:
6. If there is a shield around the telephone cable it may be
connected to “G” on the terminal block. To avoid ground
loops, we recommend connecting the shield at the computer
end only. A ground wire is not necessary for proper operation
of the Model 1040.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
11 12
XMT RCV
XMT RCV
G G
RCV XMT
RCV XMT
To Shield (Optional)
}
One Pair
}
One Pair