This is a feature-rich, modular 10/100/Gigabit switch that provides scalable, low-cost switching and all the benefits of HP Proactive Networking.

It is ideal for medium-to-large businesses looking for scalable, expandable, low-cost migration to 10/100/Gigabit switching to the desktop.
It features easy installation with 40 autosensing 10/100 ports that support any combination of 10Mbps and 100Mbps connections with no configuration required and with open universal slots that accept any combination of modules, advanced monitoring with RMON (4 groups) and RMON extensions, IEEE 802.1Q VLAN tagging which puts a secure firewall between workgroups, port mirroring which lets you monitor any combination of ports with a single RMON probe, and IP multicast (IGMP) software that prevents the flooding of multicast video traffic and supports QoS for IP multicast traffic.

Manufactured by: HP
Model/Part : J4121A
Installed Modules: max. 10
Installed Power supply: max. 2
Product Line: ProCurve
Device Type: Switch Data
Transfer: Rate 100 Mbps
Interface Type: Cable
Installed Memory:36 MB
Flash Memory: 2 MB
Enclosure Type: External
Communication Mode:Half-Duplex, Full-Duplex
Networking Speed: 10 Base T, 100 Base TX
Networking Connection Type: Ethernet, Fast Ethernet, IEEE 802.1q, IEEE 802.3u, IEEE 802.3x, IEEE 802.1d, IEEE 802.3, IEEE 802.1p
Network Ports: 40 Ports
Switching Protocol: Ethernet
Remote Management Protocol: RMON 2, RMON 3, RMON 9, SNMP 2, SNMP, RMON