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A 66 block is a type of punch-down block used to connect sets of wires in a telephone system. They have been manufactured in four common configurations, A, B, E and M. A and B styles have the clip rows on 0.25" centers while E and M have the clip rows on 0.20" centers. The A blocks have 25 slotted holes on the left side for position the incoming building cable with a 50 slot fanning strip on the right side for distribution cables. They have been obsolete for many years. The B & M styles have 50 slot fanning strip on both sides. The B style is used mainly in distribution panels where several destinations (often 1A2 key telephones) need to connect to the same source. The M blocks are often used to connect a single instrument to such a distribution block. The E style has 5 columns of 10 2 clips rows and are used for transitioning from the 25 pair distribution cable to a 25 pair RJ21 style female ribbon connector.
66 blocks are designed to terminate 20 through 26 AWG insulated solid copper wire or 18 & 19 gauge skinned 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.
The 25-pair standard non-split 66 block contains 50 rows; each row has two (E) or four (M) or six (A) & (B) columns of clips that are electrically bonded. The 25-pair split 50 66 block is the industry standard for easy termination of voice cabling, and is a standard network termination by telephone companies—generally on commercial properties. Each row contains four (M) or six (B) clips, but the left-side clips are electrically isolated from the right-side clips. Smaller versions also exist with fewer rows for smaller-scale use, such as residential.
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).
Use
Circuit pairs are connected to the block with a punch-down tool by terminating the tip wire on the leftmost slot of one row and ring wire on the leftmost slot of the row beneath the mating tip wire. Typically, a 25-pair cable coming from the phone company is punched down on the left side of a split-type block in pairs. The right hand side of the block is wired to the customer premises equipment with jumper wires. Bridging clips are used to connect the two center terminals, connecting the left-hand side of a split block with its right-hand side, thus completing the circuit. The clips form the point of interface between the subscriber and the provider. The bridging clips can be easily removed by either the subscriber or phone company personnel for trouble isolation, allowing the ability to split a circuit and determine in which direction trouble may exist. An orange insulating cover attached to a 66 block denotes its designation as a demarcation point by the local exchange carrier.
Modern 110 blocks (Originally designated as 88 blocks) have largely supplanted 66 blocks for new commercial installations at the end of the 20th century, as the capability for a circuit to carry digital data overlaid its ability to carry analog voice conversations. 110 block termination is almost always compliant with Category 5 (or higher) and therefore capable of supporting 100 MHz (or faster) signaling. Compared to 110 and higher-density wire terminating blocks, 66 blocks are physically large; and because of their maximum 16 MHz Category 3 signaling compatibility, they are ill-suited for high speed (faster than 10BASE-T) data circuits. However, special Category 5e Certified 66 blocks are available from manufacturers such as Siemon which meet all standards for Cat5e termination.
Split 50 66 blocks are still used as network interface blocks in distribution frames to interconnect circuits with bridging clips, but are primarily limited to narrowband circuits such as POTS/DSL, DS0, or DS1 circuits.
See also
National Electric Code
25-pair color code
110 block
RJ21, often used as a connector for pre-terminated 66 blocks
Notes
References
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66 block
Daftar Isi
66 block - Wikipedia
66 blocks are designed to terminate 20 through 26 AWG insulated solid copper wire or 18 & 19 gauge skinned solid copper wire. The 66 series connecting block, introduced in the Bell …
How To Wire A 66 Block - Blogger
66 blocks are older style wiring blocks for telephone wiring but many telecom installers still prefer them. They're more durable which allows them to be punched down multiple times and are …
Understanding 66 Blocks: A Comprehensive Guide
Sep 1, 2024 · What is a 66 Block? A 66 block is a type of punch-down block used to connect wiring for telephone systems and other low-voltage wiring applications. The name “66 block” …
Understanding the 66 Block Diagram: A Simplified Overview
A 66 block diagram is a type of punch-down block used in telecommunications wiring. It is commonly used in telephone systems to terminate and cross-connect multiple pairs of wires. …
66 Wiring Block Pre-wired with 2 Female 25 Pair Telco Connectors
The ICC 66 Wiring Block is designed to quickly install cables, telephone systems, PBX systems, and other low-voltage Telecom equipment. Each Block is pre-terminated and factory-tested, …
66 Block | 66 Punchdown Block - New Tech Industries
66 Blocks are used primary for telephone installations. They are now all Category 5E rated so they can be used for data installations as well or for IP telephony. 66 blocks are also available …
66 Blocks | Telephone Wiring Blocks| Phone Blocks - Cabling Plus
A 66 block is a punch down block option used to support the distribution of telephone and data services throughout a structured cabling system. Designed to support telephone wiring, the 66 …
What is 66 block? - Horizon Electronics
A 66 block (also M-Block or B-Block) is a type of punch-down block used to connect sets of wires in a telephone system. 66 blocks are designed to terminate 22 through 26 AWG solid copper …
Commercial Electric 66-Clip Connection Block 5540 - The Home Depot
Mar 21, 2017 · Commercial Electrics 66-Clip Connection Block is used to terminate high-density multi-pair telephone and data cables. Connect category 5e voice and data wiring, as well as …
How To Install A 66 Block | Punchdown Block - New Tech Industries
66 Block | 66 Punchdown Block. Installation and Termination: Securely mount the 89D standoff bracket to a wall or plywood using two screws. Route the cables over the standoff bracket from …