General
Number of RJ-45 ports	48 piece
Number of SFP+ ports	4 piece
Data transfer rate RJ-45	10/100/1000 Mbit/s
Duplex mode 10/100 Mbit/s	half or full -
Duplex mode 1000 Mbit/s	full only -
SFP+ speed	1/10 Gbit/s
Construction type	fanless -
Compatibility	IEEE 802.3, 802.3u, 802.3ab -
SFP+ type	SFP+ -
Connection type	RJ-45, SFP+ -
Autosensing	Yes -
Rack mounting	Yes -

The HP Switch with manufacturer number JL685A is a managed switch from the 1930 series, designed for use in office and enterprise networks. It features 48 RJ-45 ports that support autosensing for 10/100/1000 Mbit/s, thus supporting the standards IEEE 802.3 (10BASE-T), IEEE 802.3u (100BASE-TX), and IEEE 802.3ab (1000BASE-T). The ports allow both half- and full-duplex transmission in the 10/100 Mbit range, while full-duplex operation is available only in the gigabit range. Additionally, four SFP+ ports are integrated, which can be configured for 1 Gbit/s or 10 Gbit/s over fiber optic or copper cables (Direct Attach Copper). The fan-less design makes the switch particularly suitable for quiet working environments, as no noise is generated by cooling. The construction is intended for 24- and 48-port models without PoE (Power over Ethernet), making it ideal for standard network environments without power supply over the network cable.

Applications

The switch is designed for use in offices and small to medium-sized enterprises where a reliable, quiet, and energy-efficient network connection is required. The fan-less design allows installation in rooms where noise generation is undesirable, such as meeting rooms, administrative buildings, or small server rooms. The 48 ports provide sufficient connection options for workstations, printers, network devices, and other end devices. The SFP+ ports enable flexible expansion of the network infrastructure, e.g., for connections to other switches, servers, or storage systems via fiber optic or copper cables.

Functions and Equipment in Detail

The 48 RJ-45 ports support automatic detection of transmission speed (autosensing) and adapt to the speed of the connected device. Support for the standards IEEE 802.3, 802.3u, and 802.3ab ensures compatibility with a wide range of network devices. The SFP+ ports offer flexible expansion options for high-speed connections. The fan-less design reduces operating noise and lowers energy consumption, which is particularly beneficial in open office environments.

Technology Explained Simply

The RJ-45 ports operate with Ethernet technology and support transmission rates of 10, 100, and 1000 Mbit/s. Automatic detection (autosensing) ensures that the switch selects the optimal speed for each connected device. The SFP+ ports allow the use of fiber optic or copper cables for 1 Gbit/s or 10 Gbit/s, with the exact range and technology (e.g., Single-Mode or Multi-Mode) depending on the SFP+ module used. The fan-less design (fan-less) means no mechanical fans are used for cooling, minimizing operating noise. This is especially important in environments where constant noise exposure should be avoided.

Compatibility and Accessories

The switch can be expanded with various SFP+ modules, including 1 Gbit/s and 10 Gbit/s modules for fiber optic (e.g., SR, LR) as well as Direct Attach Copper (DAC) cables. Compatible patch cables in various lengths (e.g., 0.25 m, 0.5 m, 1 m, 2 m, 3 m, 5 m, 7.5 m, 10 m, 15 m) and categories (CAT5e, CAT6) are available, with cables equipped with S-STP (S/FTP) shielding and LSZH insulation. These cables are suitable for use in networks with high requirements for signal integrity and fire safety classification.

Mounting and Installation

The switch is designed for use in standard 19-inch rack systems.

Operational Advantages

The fan-less design ensures quiet operation, making the switch particularly suitable for office environments. The 48 RJ-45 ports provide sufficient connection options for a wide range of end devices, while the SFP+ ports enable flexible expansion of the network infrastructure. Support for common Ethernet standards ensures high compatibility with existing network devices.