I've seen Heidenhain encoders that have 5 pairs, they
have 4 lines for power. Some companies use extra
return (ground) lines. There is also the possibility
of an extra track like on brushless servo motors,
which can have a "hall track"
Or like John said, it could be an absolute encoder,
although many of those have more than 5 pairs.
I'm thinking something with 5 pairs has to be an
encoder, although I think I may have seen resolvers
with more that 6 wires.
Maybe you're going to have to post pics so we can help
identify it.
Eric
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