Key Technical Specifications
- Product Model: A4H124-24FX (P0973JN)
- Manufacturer: Enterasys Networks
- Device Type: 24-Port Managed Fiber Switch
- Port Configuration: 24x 100Base-FX + 2x Gigabit SFP
- Switching Capacity: 12.8 Gbps
- Throughput: 9.5 Mpps
- VLAN Support: 4096 Virtual Interfaces
- MAC Address Table: 16K entries
- Management Protocols: SNMP v2/v3, Telnet, SSH, HTTP, TFTP
- Standards Compliance: IEEE 802.3u, 802.3z, 802.1Q, 802.1w
- Power Supply: AC 120/230V (50-60 Hz)
- Dimensions: 17.4″ x 14.5″ x 1.7″
Product Introduction
The ENTERASYS A4H124-24FX is a 24-port managed fiber switch designed for enterprise network backbones. It combines 24 100Base-FX ports with two Gigabit SFP uplinks to handle high-bandwidth traffic efficiently.This unit delivers a 12.8 Gbps switching capacity and supports up to 4096 VLANs for strict traffic segmentation. Field technicians often rely on this specific P0973JN hardware because its port density fits standard 1U rack spaces while maintaining full Layer 2 management features like STP and LACP.
Installation & Configuration Guide
Preparation (10 min)
Verify your rack space matches the 17.4″ width. Gather your SFP modules and fiber patch cables. Check the power supply rating on the back panel. Ground yourself before touching the chassis.Removal (5–10 min)
Power down the unit completely. Unplug all fiber cables and label them immediately. Remove the mounting screws. Slide the switch out carefully to avoid damaging adjacent gear.Installation (10 min)
Slide the ENTERASYS A4H124-24FX into the rack rails. Secure the front panel screws. Insert your SFP transceivers into the two Gigabit uplink slots. Connect your fiber patch cables to the 24 front ports.Power-On & Test (10 min)
Connect the AC power cord. Press the power switch. Watch the port LEDs flash amber then green. Access the console port. Verify the firmware version matches your network standard. Run a ping test across the VLANs.
Troubleshooting Quick Reference
| Symptom | Probable Cause | Immediate Action |
|---|---|---|
| No Power LED | Bad AC cable or fuse | Swap power cord. Check outlet voltage. |
| Link LED Off | Fiber mismatch | Verify TX/RX polarity. Check SFP compatibility. |
| High Latency | Broadcast storm | Check STP status. Isolate suspect ports. |
| Console Locked | Password lost | Perform factory reset via pinhole button. |
| Intermittent Drops | Dirty fiber end | Clean fiber connectors with lint-free wipe. |
Dimensions, Mounting & Wiring Notes
The ENTERASYS A4H124-24FX measures 17.4″ x 14.5″ x 1.7″. It mounts via standard 19-inch rack ears. Weight is 10.8 lbs. Use SC-style duplex connectors for the 100Base-FX ports. Ensure bend radius exceeds 1 inch for fiber cables. The two Gigabit uplinks accept standard LC SFP modules. Always strain-relieve fiber cables to prevent port damage.
FAQ
Can I use standard copper SFPs in the uplinks?
Yes, but verify the SFP is compatible with Enterasys firmware. Some vendors lock SFP coding.I lost my config file. How do I recover?
Check your TFTP server backups. If none exist, you must rebuild from scratch. I always recommend weekly config exports.Is this switch still supported by the manufacturer?
No. Enterasys was acquired by Extreme Networks years ago. This is a legacy end-of-life product.Does it support PoE?
No. The A4H124-24FX is fiber-only. You need a separate PoE injector or different switch model for powered devices.What is the return policy on refurbished units?
We offer a 30-day functional warranty. If it fails under test conditions, we replace it. We do not cover physical damage from improper installation.How many VLANs can I actually run?
The spec says 4096, but practical limits depend on CPU load. I recommend staying under 500 active VLANs for stable performance on this hardware generation.
