A 25 pair RJ21 Amphenol cable is a necessity for many connections. This 50-pin connector interfaces for data-com trunking with the RJ21 connector, using screws to anchor into place. It is referred to as an Amphenol connector which references the connector's manufacturer. These cables are commonly used to connect wiring to a 66 or 110 block, the operation of which is frequently called to punch down, or to a patch panel. In some telephone systems the distributor will supply a cable already punched down to a block saving time on installation. Below is a useful pin out chart showing the wire colors.
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