The Huawei S1720 28GWR 4P AC is a managed Gigabit Ethernet switch that offers a range of features and capabilities for small and medium sized businesses. Here are some key parameters and features of the switch:

1. 24 10/100/1000BASE T Ports: This refers to the 24 Ethernet ports that support 10/100/1000 Mbps (Gigabit) data rates. These ports are auto sensing, meaning they can automatically detect the speed of the connected device and adjust accordingly.

2. 4 GE SFP Ports: The switch has four Gigabit Ethernet SFP (Small Form factor Pluggable) ports. These ports allow the use of SFP modules to connect with fiber optic cables for longer distance transmission or to integrate with other network devices that use fiber.

3. Fixed AC Power: The switch comes with a built in AC power supply, which means it requires a standard electrical outlet for power. This is in contrast to some switches that might offer a DC power option or a choice between AC and DC.

4. Gigabit Switch: The term "Gigabit" in the model name indicates that the switch supports Gigabit Ethernet speeds, which is suitable for high speed data transfer and network backbones.

5. Managed Switch: Unlike unmanaged switches, managed switches like the S1720 28GWR 4P AC allow for configuration and monitoring through a software interface. This is useful for network administrators who need to control and optimize network performance.

6. Wi Fi Ready (4P): The "4P" in the model name suggests that the switch is designed to support Wi Fi access points. However, this particular switch model does not include built in Wi Fi capabilities; the "4P" might refer to the potential for PoE (Power over Ethernet) to power Wi Fi access points if the switch supports PoE.

7. AC Model: The "AC" in the model name typically refers to the switch's compliance with the Access Controller role in a network, which can handle access control and authentication for devices connecting to the network.

8. PoE Support: Some models in the S1720 series support PoE, which allows the switch to power devices like IP cameras and VoIP phones over the Ethernet cable, eliminating the need for separate power sources.

Please note that the exact features and capabilities can vary between different models in the S1720 series, so it's important to check the specific model's datasheet or product page for detailed specifications.

Huawei S1720-28GWR-4P-E-AC switch supports 24 10/100/1000BASE-T ports, 4 GE SFP ports, fixed AC power：