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MRJxxxxAF-A (shown)

MRJ21 Cable Assemblies

Bel Stewart’s MRJ21 cable assembly products are designed to support increased patch panel density in telecom and premise wiring applications. This modular cabling platform supports network applications such as gigabit Ethernet, Voice over Internet Protocol (VoIP), and Power over Ethernet (PoE). Cable connection options include left and right 45 degree exits as well as a 180 degree straight cable exit to facilitate various routing schemes to component racks. In addition, these cable assemblies allow a connection migration path from legacy products including punchdown blocks, modular plug breakouts, and standard RJ21 to MRJ21 assemblies.

Designed with a die cast backshell for shielding applications, Bel Stewart’s MRJ21 cable assemblies are durability tested to 500 cycles to insure unsurpassed quality and performance. Robust jackscrews provide a secure cable connection while the sturdy boardlock design allows superior PCB strain relief.

*MRJ21 is a trademark of TE Connectivity Corporation used here under license.


  • 1 mm spacing, 1.5 mm pair -to-pair spacing
  • Dual row receptacle meets the requirements of the CompactPCI™ component standard (13.71 mm)
  • Contact layout and footprint for differential pairs creates reduced crosstalk and built-in compensation
  • Durability tested to 500 cycles
  • Designed to meet or exceed Category 5e performance standards
  • Keyed plug and receptacle insure correct connection to your system

Design Features

  • Dense, Telco-style, double -bladed design allows 1.5 to 3 times the port density of 2×6 modular RJ45 stacked jacks
  • Three times the port density of RJ21 connectors
  • Jackscrews for positive latching and secure cable retention
  • Fully shielded to reduce EMI emissions
  • Robust receptacle board lock design for superior PCB strain relief
  • Cable exit options include 180 degree straight and 45 degrees left or right
Synergy with MRJ21 Cable Assemblies
Part Number* Description
MRJxxxxAF-A 6 unshielded RJ45 connectors to 45 degree angle unshielded MRJ21 Stock Check Data Sheet
MRJxxxxDD-A MRJ21 straight to MRJ21 straight (unshielded) Stock Check Data Sheet
MRJxxxxAD-A 6 unshielded RJ45 connectors to straight unshielded MRJ21 Stock Check Data Sheet
MRJxxxxDF-A MRJ21 straight to 45 degree angle unshielded MRJ21 Stock Check Data Sheet

* xxxx denotes desired cable length from 0.5 to 100.0 meters, in 0.5 meter increments.

RoHS Compliant