66 block

A 66 block is a type of punch-down block used to connect sets of wires in a telephone system. Due to the proliferation of Voice over IP (VoIP), 66 blocks are slowly becoming obsolete.

66 blocks are designed to terminate 20 through 24 AWG insulated solid copper wire. The 66 series connecting block, introduced in the Bell System in 1962, was the first terminating device with insulation displacement connector technology. The term 66 block reflects its Western Electric model number.

66 E blocks are available pre-assembled with an RJ-21 female connector that accepts a quick connection to a 25-pair cable with a male end. These connections are typically made between the block and the customer-premises equipment (CPE).

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