General
Number of ports	4
Port type	RJ-45
Data transfer rate per port	10/100/1000 Mbit/s
Switching method	Store-and-Forward
MAC address table	1K
Standards	IEEE 802.3 10BASE-T, IEEE 802.3u 100BASE-TX, IEEE 802.3ab 1000BASE-T, IEEE 802.3x flow control
Current supply	via USB port on computer or external power supply
Power supply output	5 V DC, 1,2 A
Power supply voltage	100 to 240 V AC
Power supply frequency	50 to 60 Hz
Maximum power consumption	6 W
LED indicators	Power, LINK/ACT, 1000M
Operating voltage	5 V DC
Filter and forwarding rates	10 Mbit/s: 14,880 pps, 100 Mbit/s: 148,800 pps, 1000 Mbit/s: 1,488,000 pps
Duplex mode	Automatic (full- or half-duplex)
Warranty	1 year Double Diamond™ (Standard)
Auto-MDI/MDI-X

The BlackBox LGB408A-R2 is an unmanaged Gigabit Ethernet switch with four RJ-45 ports, designed for small networks and mobile applications. It enables the expansion of network connections in offices, during travel, or in temporary work environments where quick and easy setup is required. The switch operates without configuration and is immediately ready for use as soon as connections are established. It supports data transfer rates of 10/100/1000 Mbit/s per port and is thus suitable for applications requiring high bandwidth, such as video transmission or large file transfers.

Applications
This switch is particularly suitable for mobile workgroups, small offices, or temporary networks where a flexible and compact networking solution is needed. It can, for example, be transported in a laptop bag and is ideal for presentations, meetings, or travel, where multiple devices need to be connected to the network simultaneously. Power supply via the USB port of a laptop enables operation without an external power outlet, increasing mobility.

Features and Equipment in Detail
The switch features four autosensing ports that automatically detect the data transfer rate and duplex mode (full or half-duplex). Support for Auto-MDI/MDI-X allows the use of straight or crossover cables without requiring additional adapters. The non-blocking Store-and-Forward switching method ensures smooth data flow, as all data packets are fully received and checked before being forwarded. This minimizes errors and increases the reliability of data transmission.

Technology Explained Simply
The filtering and forwarding rates are 14,880 pps at 10 Mbit/s, 148,800 pps at 100 Mbit/s, and 1,488,000 pps at 1000 Mbit/s. These values indicate how many packets per second the switch can process, which is crucial for network performance. The MAC address table with a capacity of 1K allows storage of up to 1024 MAC addresses, sufficient to manage multiple devices in the network. Compliance with IEEE 802.3, IEEE 802.3u, and IEEE 802.3ab standards ensures compatibility with common Ethernet networks. Flow control according to IEEE 802.3x prevents data loss when ports are overloaded.

Compatibility and Accessories
The switch is compatible with devices supporting the 10BASE-T, 100BASE-TX, and 1000BASE-T standards. Power supply is either via the USB port of a laptop using the included USB power cable or via the included EU power adapter. The power adapter delivers 5 V DC at 1.2 A and can operate on AC power networks from 100 to 240 V AC. USB power supply is particularly advantageous when no power outlet is available.

Mounting and Installation
Installation requires no tools and no configuration. Devices are simply connected to the ports via RJ-45 cables. LED indicators per port (LINK/ACT and 1000M) and the power LED on the device indicate the operating status. The compact design with dimensions of 2 cm (height) × 6.2 cm (width) × 7.9 cm (depth) and a weight of 0.2 kg allows flexible placement, e.g., on a desk or behind a PC.

Operational Advantages
Unmanaged operation means no settings or configurations are required. Plug-and-play functionality ensures immediate use. The combination of USB power supply and external power adapter offers flexibility in various application scenarios. LED indicators facilitate troubleshooting, as connection status can be visually monitored. The warranty includes one year Double Diamond™ (Standard), providing a fixed service and spare parts guarantee.