Never worked on a 25 pair phone [each phone had 50 wires going to it], or any single line phone, only business phones using a KSU. The Intertell ESP phones was 4 pair.
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Never worked on a 25 pair phone [each phone had 50 wires going to it], or any single line phone, only business phones using a KSU. The Intertell ESP phones was 4 pair.
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