SFP Copper Transceiver Teltonika PR4JR20K 1.25 Gbps, RJ‑45, 100 m, metal housing

TELTONIKA PR4JR20K is a copper SFP transceiver module designed to provide up to 1.25 Gbps Ethernet over a single RJ‑45 port for short-range copper links. Housed in a grey metal enclosure, the unit is intended for integration with network switches, routers and media converters to convert or extend Ethernet signals over twisted‑pair copper cabling. It supports standard 1.25 Gigabit Ethernet signaling and is suitable for LAN upgrades, link extension and installations where a compact, protocol‑transparent copper transceiver is required.

Advantages

The transceiver offers a compact and industry‑standard solution for adding 1.25 Gb/s copper connectivity to existing network equipment without modifying connected devices. It provides transparent media conversion at the physical layer and stable short‑range performance over copper cabling. The grey metal housing offers mechanical protection and helps with heat dissipation, while RJ‑45 connectivity simplifies deployment with common Ethernet infrastructure.

Suitable for

• Extending Ethernet links over copper within office and industrial LANs
• Interfacing switches and routers that require a 1.25 Gb/s copper connection
• Upgrading network segments to support 1.25 Gb/s copper transmission
• Connecting devices in mixed‑media networks where copper conversion is necessary

Key specifications

• Maximum data transfer rate: 1250 Mbit/s
• Ethernet interface type: 1.25 Gigabit Ethernet
• Ethernet LAN (RJ‑45) ports: 1
• Maximum transfer distance over copper: 100 m
• Product colour and housing: grey metal
• Function: media conversion / copper SFP transceiver for Ethernet

How to use

Install the PR4JR20K by inserting it into the compatible SFP slot or mounting location specified by your equipment and connecting a standard RJ‑45 cable from the transceiver to the Ethernet port of a switch, router or endpoint. Use appropriate twisted‑pair copper cabling (Cat5e or Cat6 recommended) and keep cable lengths within the specified 100 m limit. Provide power and verify link/activity indicators on connected devices to confirm physical connectivity. The module performs protocol‑transparent conversion; ensure connected devices support the 1.25 Gb/s link or will negotiate to a shared rate.

Recommendations

For dependable 1.25 Gb/s operation, use quality Cat5e or Cat6 cabling, avoid exceeding recommended copper run lengths, and install the transceiver in a ventilated area away from strong electromagnetic interference. Follow local grounding and mounting guidelines for industrial environments to preserve signal integrity and equipment safety.