Arthur, what "flavor" of ethernet are they using? It makes all the difference... Here are the "rules of thumb" that I use:
10baseT You don't even need CAT5 blocks, plain 66 are fine, use clips all you want
100baseT Use the CAT5 66 blocks, one bridging clip is OK
1000baseT CAT5 66 blocks may work on short runs with NO clips and careful punching, but won't certify, not a good idea
10GIGbaseT Not even maybe. This can stop working when somebody merely touches a piece of active CAT6 cable.
Jim
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Speaking from a secure undisclosed location.
