The HP (JD990A) – Classic 24‑port Rack‑Mountable Switch (Made in the USA)The JD990A was introduced in the early 2000s as part of HP’s JDSU line and quickly became a staple for small‑to‑medium business networks. Its robust rack‑mountable chassis, reliable performance and flexible management features made it a favourite among IT professionals, and many units are still found in active use today.
Key specifications
| Specification | Details |
|---|
| Ports | 24 × 10/100 Mbps Ethernet (RJ‑45) |
| Power supply | Internal 12 V/3 A DC supply – tested and working |
| Management | Web‑based interface with VLAN, QoS, port mirroring, link aggregation, spanning‑tree protocol etc. |
| Boot ROM | Flashable BIOS – original version supports boot from flash or EEPROM |
| Dimensions | 22 × 14 × 5 cm (W × H × D) |
| Weight | Approx. 1.2 kg |