66E3-25 Connecting Block

The 66E3 blocks make it easy to install 1A2 extensions in different rooms of an office or house. With these blocks mounted to a wall, a cut cable run through the wall can be punched down onto the block to act as an amphenol wall jack for a 1A2 phone.

No special equipment needed other than a punch tool, and allows for custom wiring arrangements at each block. Another cable can be punched down on the second rows of the block to optionally extend to other extensions, making it a possible point in a chain, instead of just a termination point.

Quoting BSP 461-604-103: "The 66E3-25 and 66E4-25 connecting blocks each consist of fifty 2-terminal connectors inserted in a molded plastic block and factory-wired to a 50-contact connector."

These 25 pair connection blocks can be mounted to a wall or floor, and used as either an end point for a single 1A2 phone set to plug directly into the 66E3's female connector, or it can be one block in a chain of extensions, allowing phones to all be "bridged" together electrically.

The punch block provides a termination point for a cut 25 pair cable where a phone set will be located. The cable is typically from a KSU and snaked through the wall or floor at a conveninent location for a 1A2 phone extension's male connector to directly plug into the 66E3's female amphenol on the block.

The decorative cover goes over the block for a clean finished install, as shown here (at the lower left) with a 2851:

photo courtesy of Scott Bonk. Used with permission.

Wiring

The 50 conductors from the 25 pair cable are broken out into color groups, shown in light gray at the left of each horizontal row:

Note the numbers in parentheses are the amphenol connector pin numbers. This diagram can be used to help wire up the block properly.

There are two rows of pins for each color group. By convention, the lower rows (row #2,4,6,8,10 in the above diagram) are inputs to the block (typically from the KSU, or a previous 66E3 block in a chain), and the upper rows (row #1,3,5,7,9 in the above) are for "outputs" to other extensions (if any).

If the block is a simple termination point for only one extension, then only the bottom rows of pins should be wired, as shown here:

The wires come in from the back of the block and are wired to the bottom row of pins in each color group.

If the block is located in the middle of a chain, you can run another cable out to the next extension from the top rows of pins in each color group, shown in blue in the following diagram: