J9990A - Aruba 20-port MACsec v3 zl2 Module

HPE Aruba J9990A — 1000Base-T RJ-45 SFP Transceiver

What it is

The HPE Aruba J9990A is a Gigabit Ethernet SFP transceiver that provides 1000Base-T connectivity over standard copper Ethernet cabling. It allows switches and network devices with SFP ports to connect to RJ-45 copper networks instead of fiber.

Why buyers pick J9990A (plain English)

• Copper over SFP: Turns an SFP slot into a standard RJ-45 Gigabit Ethernet port.

• Uses existing cabling: Works with common Cat5e/Cat6 copper cables — no fiber required.

• Gigabit speed: Full 1 Gbps performance for access switches and edge connections.

• Flexible deployments: Ideal when fiber isn’t available or necessary.

• Easy upgrades: Adds copper connectivity without replacing network hardware.

60-second spec box (J9990A)

Form factor
SFP (RJ-45 copper)

Speed / protocol
10/100/1000 Mbps Ethernet (1000Base-T)

Media type
Copper Ethernet

Connector type
RJ-45

Max distance
Up to 100 meters over Cat5e/Cat6

Where it fits (and when to choose something else)

Perfect for:

• Adding copper ports to SFP-only switches

• Edge access connections

• Temporary or flexible network setups

• Environments where fiber isn’t required

Choose something else if:

• You need fiber links → use 1000Base-SX or LX SFPs

• You need longer distances → fiber optics are better

• You need lower power draw → fiber SFPs consume less power

TL;DR

J9990A is an HPE Aruba 1000Base-T SFP transceiver that lets you run Gigabit Ethernet over standard copper cabling using an SFP slot — simple, flexible, and cost-effective.