An Abspannbock enabled the orderly termination of field telephone lines at a telephone exchange (switchboard).
Field telephone wires are landed on the insulators of a terminal block. There were two types of terminal blocks: Long and short. The long ones were more common, and had 40 insulators for landing 20 phone extensions. The short ones only had 20 insulators.
For a short terminal block, a typical Abspannbock frame can be constructed using two long poles and a short pole. The two long poles were sunk into the ground, pointed fitting down. The termination block was then clamped between the two long poles. For stability, the short pole was attached between the two long poles with ropes. The ropes were tied with a square lashing. Anchor ropes were looped around the tapered interlocking fittings on the other ends of the long rods. These anchor roes were held taught with stakes driven into the ground.
For a long terminal block, substitute a long pole for the short pole. Everything else is constructed the same way.
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WW2 German Field Telephone Equipment 