LT-AHG0421HV PoE++ Switch – Product Overview

LT-AHG0421HVPoE++ Switch – FAQ

1. How many ports does this PoE switch have and what are their speeds?

Answer: The switch provides 7 usable ports:

• Ports 1–4: 10/100/1000Mbps PoE ports

• Ports 5–6: 10/100/1000Mbps uplink RJ45 ports

• Port 7: 1000Mbps SFP fiber slot
  All ports support non-blocking wire-speed forwarding.

2. What is the PoE power output on Port 1? How is it different from other ports?

Answer:

• Port 1 supports IEEE 802.3af/at/bt (PoE++), up to 90W – ideal for high‑power devices like PTZ cameras or Wi‑Fi 6 APs.

• Ports 2–4 support IEEE 802.3af/at, up to 30W per port.

• Total PoE power budget: 120W.

3. Does the switch support intelligent PoE power priority management?

Answer: Yes. When the remaining power is low, the switch automatically gives priority to high‑priority ports to prevent overload. This ensures critical devices keep running.

4. How does the Watchdog function work?

Answer: The watchdog function works on ports 1–4. It continuously monitors data communication of connected devices (e.g., IP cameras). If a device stops working for 2 minutes, the corresponding port will automatically restart to recover the device – no manual maintenance needed.

5. How far does Long‑Range mode reach? How do I enable it?

Answer: Turn on the “Long Range” DIP switch on the device. Ports 1–4 will reduce speed to 10Mbps but can transmit PoE and data up to 250 meters over Cat5e/Cat6 cable. Perfect for large surveillance sites or aging cable lines.

6. What does VLAN mode do?

Answer: When VLAN mode is enabled (often together with Long Range), ports 1–4 are isolated from each other – they cannot talk directly to one another, but they can all communicate with uplink ports 5–6. This reduces broadcast storms, prevents DHCP conflicts, and improves network security and efficiency for CCTV systems.

7. What protection features are built into the switch?

Answer: The switch includes multiple protections:

• 6KV surge/lightning protection (both ports and power supply)

• OVP (Over Voltage Protection)

• Short‑circuit protection

• Overload protection
  These ensure safe, reliable operation even in outdoor or industrial environments.

8. Do I need to configure the switch?

Answer: No. It is plug‑and‑play – unmanaged. Just connect power and network cables. The DIP switches provide easy extended functions (Long Range / VLAN). No command line or web login required.

9. What are the operating temperature and installation options?

Answer:

• Operating temperature: 0°C ~ 55°C (32°F ~ 131°F)

• Storage temperature: -40°C ~ 70°C (-40°F ~ 158°F)

• Housing: galvanized steel, fanless silent design, excellent heat dissipation

• desktop or rack‑mount ready.

10. What kind of SFP module can I use in the SFP slot?

Answer: The SFP slot supports 1000Mbps standard SFP modules (fiber uplink). The transmission distance depends on the module – options include 20km, 40km, 100km, etc.

11. What applications is this PoE switch best for?

Answer: Ideal for:

• IP surveillance (especially PTZ cameras requiring 90W PoE++)

• Wi‑Fi AP deployments (including Wi‑Fi 6)

• Smart buildings, hotels, schools, factories – any scenario needing long‑range PoE transmission.

12. What is the ordering information?

Answer:
Model:LT-AHG0421HV
Description: PoE++ switch with 4 Gigabit PoE ports (Port 1: 90W bt), 2 Gigabit uplink RJ45 ports, 1 Gigabit SFP slot, built‑in 120W power supply. Supports watchdog, 250m long range, VLAN, 6KV surge, OVP, and short‑circuit protection.
Unit: pc