Network switch module Mikrotik S-RJ01 Gigabit Ethernet

The Mikrotik S-RJ01 Gigabit Ethernet module is an SFP copper transceiver providing 10/100/1000 Mbps Ethernet connectivity via an RJ-45 port. Designed for use in SFP slots on switches, routers and other networking devices, it supports up to 1.25 Gb/s bi-directional data links and a copper transmission reach of up to 100 metres over unshielded twisted pair cabling. The module follows SFP MSA and IEEE 802.3 specifications and is RoHS compliant.

Advantages

The S-RJ01 uses a hot-pluggable SFP footprint and a single +3.3 V power supply, enabling easy installation and replacement without powering down equipment. It provides access to the physical layer IC through a 2-wire serial bus for management or monitoring. Compliance with SFP MSA and IEEE 802.3 ensures interoperability with most Gigabit SFP ports.

Suitable for

• Adding a Gigabit RJ-45 copper port to SFP-equipped switches and routers
• Short-distance copper uplinks and desktop/server connectivity (up to 100 m)
• Environments requiring hot-swappable media modules

Key specifications

• Interface: RJ-45
• Supported speeds: 10/100/1000 Mbps
• Data link rate: up to 1.25 Gb/s (bi-directional)
• Maximum copper reach: 100 m over unshielded twisted pair
• Power supply: +3.3 V single power rail
• Standards: IEEE 802.3, SFP MSA
• RoHS compliant
• Operating case temperature: 0°C to +85°C

How to use

Insert the S-RJ01 module into a compatible Gigabit SFP slot until it latches. Connect a standard RJ-45 Ethernet cable to the module and the remote device. The module is hot-pluggable so it can be installed or removed while the host device is powered on; ensure the host device supports SFP copper modules. Configure the network settings on your switch or router as required; physical link negotiation will handle speed and duplex settings with compatible devices.

Recommendations

Use Cat5e or better unshielded twisted pair (UTP) cabling for reliable Gigabit performance up to 100 metres. Avoid installing the module in environments outside the specified case temperature range (0°C to +85°C). For network management, use the host device tools to monitor link status via the module's 2-wire serial bus access if supported.