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Pre-Wired 66 Block With RJ11/RJ45 Jacks - 50-Pair

by Dynacom
SKU: PP7-2153-RJ11
Various lead times may apply to this product. Please contact us for more details.

RoHS Compliant

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Pre-Wired 66 Block with RJ11 or RJ45 Connectors, 50 Pair

Dynacom's 66 block is a punch down block containing rows of four IDC style clips. It is used for terminating 22-26 AWG solid copper cross-connect station wiring for many types of phone systems. The Pre-Wired 66 Block is available with RJ11 or RJ45 connectors in an 8-Port configuration. Once the cross connect wires have been distributed to the proper terminals, a bridge clip is used to finish the terminations. A bridge clip is used to connect two center terminals of a split block, effectively completing the circuit and connecting the left and right side of the 66 block. The metal bridge clips can be easily removed in order to allow the service subscriber or the service provider to split a circuit or troubleshoot problem areas of the circuit. This pre-wired 66 block does not contain feet, meaning that it will require a backboard or 89B bracket in order to mount it securely to a wall.

To complete your CAT3 network we carry a full end to end solution including CAT3 bulk Ethernet cables, Phone cords, CAT3 modular plugs, CAT3 keystone jacks & couplers, Blank Patch Panels, Telco Blocks, wall plates. We also have a large assortment of tools, testers and cable management accessories that will help make your installation fast, smooth and organized. If you have any questions, feel free to give us a call.



  • Voice Grade
  • 50-Pair Blocks
  • USOC Wired
  • 66BM08-3 - Eight 6-Conductor RJ11 Jacks (for three lines per drop)



Temperature Range

Storage -40º to +70ºC
Operation -10º to +60ºC
Relative Humidity (Operational) Maximum Noncondensing 93%


Insulation Resistance 500MΩ min. @ 100V d.c
Dielectric Withstanding Voltage 1000V RMS @ 60Hz for 1 min
Spring Wire Contact Resistance 20M Ω Max
IDC Contact Resistance 2.5M Ω Max


Total Contact Force 800 Grams for A 8 Wire Leads Minimum
Retention 50N (11 Ibf) for 60s±5s
Insertion / Extraction Life 750 Cycles Minimum
IDC Wire Gauge 22 ~ 26 AWG


Housing / Bezel High Impact, Flame Retardant Plastic, UL94V-0
Spring Wire Phosphor Bronze Alloy Plated with 50 Micro-inch of Gold Over 70~100 Micro-inch of Nickel
IDC Brass Plated with 100 Micro-inch of Sn

Additional Information

Telco Block Accessories

Telco blocks are utilized to connect phone systems to data networks. There are two popular forms of telco blocks: the 66 block and the 110 block. The 66 block is quite common in modern phone systems, as they simplify connecting multiple phone lines. The 66 block is also referred to as B-blocks, M-blocks, and as split-50 blocks. We also have Cable Distribution Spools, or mushroom posts for managing your cross connect wire. It is designed for mounting onto walls or other surfaces to help support and guide your cross connect wire. Our cable distribution spools are also ideal for Cat3 cable for telephone applications.

To learn more about our Telco Block Accessories please visit our overview page. Our CAT5E 110 Wiring Blocks can be combined with a wide array of products such as:

What's in the box?

What's in the box?

  • Qty 1 - Pre-Wired 66 Block with RJ11/RJ45 Jacks - 50-Pair