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by Hp
Product Line: HP 2530 series Ethernet switches
Product Type: Switch
Original price $0.00 - Original price $123.00
Original price
$0.00 - $123.00
Current price $123.00
Title: Used

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Product Description

The J9781A HP features 48 RJ-45 autosensing 10/100 ports and 2 autosensing 10/100/1000 ports, complemented by 2 fixed Gigabit Ethernet SFP ports and a dual-personality console port, supporting diverse network connectivity options. It delivers a switching capacity of 17.6 Gb/s and a throughput of up to 13 million pps (64-byte packets), ensuring efficient data handling. Designed for versatility, it supports mounting in a 19-inch rack, horizontal surface, or wall mounting, and operates within a temperature range of 0° to 45°C, with a maximum power consumption of 29.9 W.

Key Feature for the J9781A

  • What are the types of ports available on this networking device?
    This device includes 48 RJ-45 autosensing 10/100 ports, 2 autosensing 10/100/1000 ports, and 2 fixed Gigabit Ethernet SFP ports. It also has a dual-personality serial console port that can utilize RJ-45 or USB micro-B connections.
  • How does the duplex setting vary among different port speeds?
    10BASE-T/100BASE-TX ports support half or full duplex, while 1000BASE-T ports operate at full duplex only.
  • What is the maximum switching capacity of the device?
    The switching capacity is 17.6 Gb/s.
  • What are the device's physical dimensions and weight?
    The device measures 44.2 cm in width, 24.64 cm in depth, and 4.45 cm in height, with a weight of 2.86 kg.
  • Can you detail the power specifications for this networking hardware?
    It operates on a voltage range of 100 - 127 / 200 - 240 V ac, with a current of 0.7/0.4 A. The idle power consumption is 17.1 W, and the maximum power rating is 29.9 W.
  • What are the operating and non-operating temperature ranges?
    The operating temperature range is 0° to 45°C, while the non-operating/storage temperature range is -40° to 70°C.
  • How does this device handle heat dissipation, and what is its maximum heat output?
    The maximum heat dissipation is 102 BTU/hr (107.61 kJ/hr).
  • What are the options for mounting this networking device?
    It can be mounted in an EIA-standard 19-inch telco rack or equipment cabinet, horizontally on a surface, or on a wall.
  • What is the device's throughput capability?
    The throughput capability is up to 13 million pps (64-byte packets).
  • Describe the device's operational noise level.
    The operational noise level is rated at 0 dB for both acoustic power and pressure, indicating silent operation.

Product Review

The HP J9781A switch offers a solid base for small to medium-sized network deployments with its 48 RJ-45 10/100 ports and additional 2 Gigabit Ethernet and 2 SFP ports, providing a good mix of speed and connectivity options. However, its throughput of 13 million pps and switching capacity of 17.6 Gb/s may not meet the demands of networks with high traffic intensity or those requiring extensive data processing capabilities. The unit's compact 1U design, low power consumption (17.1W idle, 29.9W maximum), and silent operation make it an efficient and unobtrusive choice for office environments, though its performance limitations in larger, more data-intensive settings should be considered.


The HP J9781A is a versatile networking switch designed to accommodate the needs of small to medium-sized business networks. This device offers a comprehensive set of features tailored for efficient network management and expansion. The hardware specifications highlight its capability to handle substantial data traffic while ensuring reliable connectivity across all connected devices. This switch includes 48 RJ-45 autosensing 10/100 ports that comply with IEEE 802.3 Type 10BASE-T and IEEE 802.3u Type 100BASE-TX standards, facilitating seamless integration into existing network infrastructures. Additionally, it features 2 autosensing 10/100/1000 ports (IEEE 802.3ab Type 1000BASE-T) to accommodate higher-speed connections essential for backbone linkages or server aggregations. These ports support both half and full duplex modes for 10BASE-T/100BASE-TX, and full duplex only for 1000BASE-T, optimizing the data flow and minimizing packet collisions.
  • Dual fixed Gigabit Ethernet SFP ports expand network connectivity options, providing flexibility for long-distance uplinks.
  • A unique dual-personality port serves as either an RJ-45 or USB micro-B serial console port, offering versatile management interfaces.
  • With a throughput of up to 13 million packets per second (pps) on 64-byte packets and a switching capacity of 17.6 Gb/s, this switch is engineered to handle substantial network traffic efficiently.
Measuring 44.2 cm in width, 24.64 cm in depth, and 4.45 cm in height, the HP J9781A fits into a standard 1U rack space, making it suitable for mounting in EIA-standard 19-inch telco racks, equipment cabinets, or even for horizontal surface and wall mounting. This compact form factor, combined with a weight of just 2.86 kg (6.3 lb), ensures that it can be easily integrated into various environments without requiring extensive space. The switch operates efficiently with a maximum heat dissipation of 102 BTU/hr (107.61 kJ/hr), drawing a maximum power of 29.9 W. It supports a voltage range of 100 - 127 / 200 - 240 V AC, with a frequency requirement of 50/60 Hz. Its power efficiency is further highlighted by an idle power consumption of just 17.1 W, making it an energy-conscious choice for businesses looking to optimize their operational costs. Environmentally, the HP J9781A is designed to function within a broad range of conditions. It can operate in temperatures from 0° to 45°C (32° to 113°F) and withstand non-operating temperatures ranging from -40° to 70°C (-40° to 158°F). Humidity tolerance is also robust, with the device operating reliably at 15% to 95% relative humidity at 40°C (104°F) and enduring non-operating humidity levels of 15% to 90% at 65°C (149°F). The device's altitude tolerance extends up to 3 km (10,000 ft), ensuring its operability in varied geographical locations. In terms of acoustics, the HP J9781A operates silently with both acoustic power and pressure levels at 0 dB, making it an unobtrusive addition to any office environment. This switch combines essential networking functionalities with efficient operation, making it a suitable choice for businesses seeking to enhance their network infrastructure with a reliable, scalable solution.


Item NumberHP J9781A
Interface Quantity48 10/100 Mbps RJ-45 ports with auto-negotiation (compliant with IEEE 802.3 and IEEE 802.3u standards)
Additional Interface Types2 10/100/1000 Mbps RJ-45 ports with auto-negotiation (IEEE 802.3, IEEE 802.3u, and IEEE 802.3ab compliant)
Transmission ModeAuto-MDI/MDIX on 10/100 ports for half/full duplex, 1000 Mbps ports support full duplex only
Specialized Ports2 fixed SFP slots for fiber connectivity and 1 configurable console port (RJ-45 or USB micro-B)
Packet Forwarding RateUp to 13 Mpps (for 64-byte frames)
Switch Fabric Speed17.6 Gbps
Width44.2 cm
Depth24.64 cm
Height4.45 cm
Unit Mass2.86 kg
Installation MethodCompatible with EIA-standard 19 in. racks, horizontal or wall mount
Heat Output102 BTU/hr
Power Supply Range100 - 127 / 200 - 240 V AC
Electric Current Demand0.7/0.4 Amps
Energy Consumption (Idle)17.1 Watts
Peak Power Consumption29.9 Watts
Operational Frequency50/60 Hz
Temperature (Operational)0° to 45°C
Humidity (Operational)15% to 95% non-condensing at 40°C
Temperature (Storage)-40° to 70°C
Humidity (Storage)15% to 90% non-condensing at 65°C
Max Altitude for OperationUp to 3,000 m
Acoustic NoisePower: 0 dB, Pressure: 0 dB

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