Description

Huawei CloudEngine S5731S-L4P2ST-RUA Remote Unit (4-Port PoE+)

The Huawei CloudEngine S5731S-L4P2ST-RUA is a highly adaptable Gigabit Remote Unit (RU) designed for Huawei’s simplified campus network architecture. Featuring 4 x 10/100/1000Base-T PoE+ ports and a flexible dual-media uplink (1 x SFP + 1 x RJ45), this unit provides high-speed data and power to terminal devices while offering versatile backhaul options. It is perfect for upgrading existing rooms where cabling types (fiber or copper) may vary.

Key Features & Product Highlights

Flexible Dual-Media Uplinks: Equipped with 1 x GE SFP port and 1 x 10/100/1000Base-T port. This allows the RU to connect to the central switch via fiber-optic for long distances or copper Ethernet cable for existing structured cabling.
Reliable PoE+ Power Supply: All 4 downlink ports support IEEE 802.3at PoE+, delivering up to 30W per port. Easily power Wi-Fi 6 APs, IP cameras, and smart office devices.
Zero-Touch Configuration: As a managed remote unit, it requires no independent IP or local configuration. It is automatically discovered and managed by the central switch, enabling rapid deployment.
Silent & Fanless Operation: Designed for 0 dB noise output, making it an ideal choice for placement inside hotel rooms, offices, and bedside in hospitals.
Ultra-Compact Design: Small enough to be installed in standard electrical boxes, ceiling gaps, or discreetly under a desk.

Performance

Forwarding performance: 7.5Mpps
Switching capacity: 10/120 Gbps

Power Solutions & Connectivity

To ensure optimal performance, the S5731S-L4P2ST-RUA uses specialized accessories:

External Power Adapter: Requires a 54V DC input (typically an AC/DC 150W adapter) to support PoE+ output across all ports.
Uplink Versatility: Use the SFP port for fiber backhaul up to 10km+ or the RJ45 port for standard copper backhaul within 100 meters.
Central Switch Compatibility: Fully compatible with Huawei S6730-H, S5731-H, and S12700E series central switches.

Why Choose S5731S-L4P2ST-RUA?

Maximum Installation Flexibility: You are not limited by the type of uplink cable available in the wall. The ST-model handles both.
Reduced Deployment Time: Since the configuration is centralized, on-site technicians only need to plug in the cables.
Low Maintenance: No fans to fail and no local software to patch, leading to significantly higher MTBF (Mean Time Between Failures).

Specification

Item	Specification
Dimensions without packaging (H x W x D) [mm(in.)]	Basic dimensions (excluding the parts protruding from the body): 38.0 mm x 185.0 mm x 115.0 mm (1.5 in. x 7.28 in. x 4.53 in.) Maximum dimensions (the depth is the distance from ports on the front panel to the parts protruding from the rear panel): 38.0 mm x 185.0 mm x 115.0 mm (1.5 in. x 7.28 in. x 4.53 in.)
Dimensions with packaging (H x W x D) [mm(in.)]	82.0 mm x 350.0 mm x 222.0 mm (3.23 in. x 13.78 in. x 8.74 in.)
Chassis height [U]	0.86 U
Chassis material	Metal
Weight without packaging [kg(lb)]	1.14 kg (2.51 lb)
Weight with packaging [kg(lb)]	1.46 kg (3.22 lb)
Typical power consumption [W]	6.80 W (device) 7.68 W (device + power adapter)
Typical heat dissipation [BTU/hour]	23.20 (device) 26.21 (device + power adapter)
Maximum power consumption [W]	Without PoE: 7.00 W (device)/7.88 W (device + power adapter) Full PoE load: 88.0 W (PoE: 77 W)
Maximum heat dissipation [BTU/hour]	Without PoE: 23.88 (device)/26.89 (device + power adapter) Full PoE load: 300.27
Static power consumption [W]	4.68 W
MTBF [years]	78.74 years
Availability	> 0.99999
Noise at normal temperature (acoustic power) [dB(A)]	Noise-free (no fans): < 30
Noise at normal temperature (acoustic pressure) [dB(A)]	Noise-free (no fans): < 20
Number of card slots	0
Number of power slots	0
Number of fans modules	0
Redundant power supply	Not supported
Long-term operating temperature [°C(°F)]	-5°C to +45°C (23°F to 113°F) at an altitude of 0-1800 m (0-5906 ft.)
Restriction on the operating temperature variation rate [°C(°F)]	When the altitude is 1800-5000 m (5905.44-16404 ft.), the highest operating temperature reduces by 1°C (1.8°F) every time the altitude increases by 220 m (721.78 ft.). The device cannot start when the temperature is lower than 0°C (32°F). The operating temperature of a device ranges from -5°C to +45°C (23°F to 113°F) when the device uses the following optical modules: – GE optical modules with a transmission distance of less than or equal to 10 km
Storage temperature [°C(°F)]	–40°C to +70°C (–40°F to +158°F)
Long-term operating relative humidity [RH]	5% RH to 95% RH, non-condensing
Long-term operating altitude [m(ft.)]	0–5000 m (0–16404 ft.)
Storage altitude [m(ft.)]	0-5000 m (0-16404 ft.)
Power supply mode	Power adapter
Rated input voltage [V]	Power adapter input: 100–240 V AC; 50/60 Hz Power adapter output: 56 V DC
Input voltage range [V]	Power adapter input: 90–290 V AC; 47–63 Hz
Maximum input current [A]	1.6 A
Memory	–
Flash memory	–
Console port	Not supported
Eth Management port	Not supported
USB	Not supported
RTC	Not supported
RPS input	Not supported
Service port surge protection [kV]	Common mode: ±6 kV
Power supply surge protection [kV]	Power adapter: ±6 kV in differential mode and ±6 kV in common mode
Ingress protection level (dustproof/waterproof)	IP20
Types of fans	None
Heat dissipation mode	Natural heat dissipation
Airflow direction	–
PoE	Supported
Certification	EMC certification Safety certification Manufacturing certification

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