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A4H124-48P
A4H124-48P
A4H124-48P

Enterasys A4H124-48P 48-Port PoE Fast Ethernet Switch

  • Model: A4H124-48P
  • Brand: Enterasys Networks (now part of Extreme Networks)
  • Series: A-Series A4
  • Core Function: Managed Fast Ethernet PoE access switching
  • Product Type: Layer 2 Managed PoE Ethernet Switch
  • Key Specs: 48 × 10/100BASE-T PoE ports, 2 × 10/100/1000 RJ45 uplink/stack ports, 2 × Gigabit SFP slots
  • ⚠️ Obsolete Model – Limited Stock Available
  • Condition: New Original / New Surplus
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Description

3. Key Technical Specifications

Parameter Value
Access Ports 48 × 10/100BASE-T RJ45 with IEEE 802.3af PoE
Uplink/Stack Ports 2 × 10/100/1000BASE-T RJ45
Fiber Uplinks 2 × Gigabit SFP slots
Switching Capacity 17.6 Gbps (single switch)
Forwarding Rate 13.1 Mpps
Stack Support Up to 8 A4 switches
Processor MPC8241, 266 MHz
Memory 256 MB SDRAM
Flash Memory 32 MB
Input Voltage 100–240 VAC, 50/60 Hz
Operating Temperature 0 °C to 50 °C
Dimensions 44.1 × 4.4 × 36.85 cm
Weight Approximately 6.0 kg
Power Consumption Approximately 73.4 W (excluding PoE load)

 

4. Product Introduction

The Enterasys A4H124-48P is a managed Layer 2 Fast Ethernet switch designed for enterprise edge networks requiring Power over Ethernet connectivity. It provides forty-eight IEEE 802.3af PoE access ports, two Gigabit RJ45 uplink/stack interfaces, and two Gigabit SFP uplink ports for fiber connectivity.

Although this platform is now considered a legacy product, it continues to serve reliably in industrial facilities, schools, hospitals, and commercial buildings where Fast Ethernet bandwidth is sufficient. Engineers often deploy it to power IP phones, wireless access points, badge readers, and surveillance cameras while maintaining centralized management and switch stacking.

 

5. Installation & Configuration Guide

 

Stage 1 – Pre-Installation Preparation (10 minutes)

⚠️ Safety First

  1. Notify operations personnel before maintenance.
  2. Follow lockout/tagout procedures.
  3. Disconnect AC power.
  4. Wait at least five minutes before opening the rack.

Tools Required

  • Grounded ESD wrist strap
  • Phillips screwdriver
  • Digital multimeter
  • Cable labels
  • Smartphone for documentation

Data Backup

  • Save the running configuration.
  • Record the management IP address.
  • Document VLAN assignments.
  • Photograph all uplink, stack, and PoE connections.

 

Stage 2 – Removing the Existing Switch (5–10 minutes)

  1. Label every copper and fiber cable.
  2. Disconnect powered devices.
  3. Remove stacking cables.
  4. Unscrew the rack brackets.
  5. Slide the switch straight out to prevent connector damage.

⚠️ Keep the existing switch until the replacement has passed all functional tests.

 

Stage 3 – Installing the New Switch (10 minutes)

  1. Verify the replacement model is A4H124-48P.
  2. Wear an ESD wrist strap.
  3. Mount the switch securely.
  4. Reinstall SFP modules.
  5. Reconnect uplink, stack, and access cables.
  6. Restore AC power.

Self-Checklist

  • Model number confirmed
  • Stack cables connected correctly
  • Fiber polarity verified
  • PoE devices connected
  • Rack screws tightened

 

Stage 4 – Power-On & Testing (15 minutes)

  1. Verify input voltage.
  2. Apply power.
  3. Wait for the CPU LED to complete initialization.
  4. Confirm the CPU LED changes from amber to green.
  5. Access the management interface.
  6. Verify firmware version.
  7. Restore the saved configuration if necessary.
  8. Confirm VLANs, PoE operation, uplinks, and switch stacking.

⚠️ Troubleshooting Note

If the CPU LED remains red after boot, first verify firmware integrity and stacking configuration before assuming hardware failure. During replacement projects, configuration mismatches cause more downtime than defective hardware.

A4H124-48P
A4H124-48P
A4H124-48P
A4H124-48P

 

6. Frequently Asked Questions (FAQ)

Q1. Does the A4H124-48P support Power over Ethernet?

Yes. All forty-eight RJ45 access ports support IEEE 802.3af PoE, making the switch suitable for powering IP phones, wireless access points, and security cameras.

Q2. Is this switch still manufactured?

No. The A4 Series has reached legacy status following the integration of Enterasys into Extreme Networks. Most available inventory comes from New Surplus or professionally tested refurbished stock.

Q3. Can multiple A4 switches be stacked?

Yes. The A4 platform supports stacks of up to eight switches using its dedicated Gigabit stack/uplink interfaces, allowing centralized management through a single IP address.

Q4. Can I hot-swap the switch?

No. Replace the chassis only after removing power. Hot-swapping the entire switch can interrupt stack communication and may damage connected equipment.

Q5. What is the most common installation mistake?

The mistake I encounter most often is reconnecting stack cables in the wrong order. The hardware itself is usually fine, but incorrect stack topology prevents member switches from joining correctly. Label every cable before removal and restore the original topology exactly.

Q6. Is Fast Ethernet still appropriate for new deployments?

For modern Wi-Fi 6/6E, high-resolution surveillance, or high-throughput desktop environments, Gigabit access switches are generally the better choice. However, the A4H124-48P remains a practical replacement where existing infrastructure already operates at 10/100 Mbps and replacement compatibility is more important than increasing bandwidth.

Q7. Why is the price much lower than when it was originally sold?

This switch was originally marketed for enterprise campus networks. Today, surplus inventory from corporate upgrades and decommissioned installations has significantly reduced market prices, even for factory-sealed units. Always verify whether the offered equipment is New Original, New Surplus, or Refurbished (tested) before purchasing.

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