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Black panel-mount RJ11 coupler, four-wire unshielded

Black Box Corporation

Black Box Corporation FMT1080 network ethernet cable

SKU CH-FEG9-9YZ33 MPN FMT1080

A black RJ11 panel-mount coupler with four wires for telephone connections

  • TypeOthers
  • ColorBlack
  • Panel-mount RJ11 coupler secures connections in rack installations
  • Unshielded 4-wire design supports basic voice and data links
  • Black housing matches standard cabinet aesthetics
  • FMT1080 model simplifies ordering and spare-part tracking
  • RJ45 variant available for mixed-cable environments

Panel Mount RJ11 Coupler

The Black Box Corporation FMT1080 is a panel mount coupler designed for RJ11 connections. It provides a secure mounting point for telephone or modem lines in rack or wall installations. The unshielded four-wire design suits standard voice and low-speed data applications. This component is intended for installers terminating fixed wiring infrastructure.

Unshielded Four-Wire RJ11 Interface

The single specification that determines compatibility is the unshielded four-wire RJ11 interface. It accepts standard RJ11 plugs on both sides for straight-through coupling. No shielding is present, so it is not suited for environments with high electromagnetic interference. Verify that your cabling uses four conductors before ordering.

Passive Component Thermal Profile

As a passive coupler, the unit generates no heat and requires no power supply. It operates silently because there are no moving parts or active electronics. The black plastic housing remains at ambient temperature during normal use. No cooling considerations or power budget adjustments are necessary.

Highlights

  • Panel-mount RJ11 coupler secures connections in rack installations
  • Unshielded 4-wire design supports basic voice and data links
  • Black housing matches standard cabinet aesthetics
  • FMT1080 model simplifies ordering and spare-part tracking
  • RJ45 variant available for mixed-cable environments

Specifications

BrandBlack Box
TypeOthers
ColorBlack
Shipping weight0.45 kg
Package size38 × 33 × 28 mm

Questions about this item

What does the 4-wire RJ11 coupler actually carry in a live phone or data line?

It passes the two active pairs needed for a single analogue voice circuit or a basic low-speed data link, leaving the outer pins unused.

How does the unshielded panel-mount design affect signal quality on a typical desk installation?

Without shielding the coupler relies on the twisted-pair cable itself to reject noise; keep the untwisted portion short and away from power cords.

What cut-out size and panel thickness does the FMT1080 need for a secure front-mount fit?

The coupler uses a standard 11 mm D-hole and locks into panels up to 3 mm thick with its integrated snap clips.

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