The HP (JF061A) was formerly sold as the 3Com (3CR17451-91) SuperStack 3 3870 48-port Switch
The JF061A and 3CR17451-91 are the same product
See Hp cross refernece look up:
3COM corporation was aquired by HP on November 11, 2009
The hp/3Com JF061A/3CR17451-91 48-port 10/100/1000 Gigabit Ethernet switch combines wirespeed Layer 2 switching with stackability up to eight units high via a 40Gbps stacking architecture for impressive scalability to 384 ports total.
The hardware supports a 10-Gigabit expansion slot and is Layer 3-capable for investment protection.
Product number: JF061A
Product name: HP SuperStack 3 3870 48-port Switch
Product type: Fixed Port L2 Managed Ethernet Switches
Product series: HP SuperStack 3 3000/3800 Switch Series
SuperStack 3 Stackable Ethernet Switch 3870
For Enterprise Ethernet networks needing a scalable, stackable, future-proof Gigabit Layer 2/3 switching and routing solution, the 3Com SuperStack 3 Switch 3870 48-Port is recommended.
This 48-port 10/100/1000 Gigabit Ethernet switch combines wirespeed Layer 2 switching and dynamic Layer 3 routing with stackability up to eight units high via a 40Gbps stacking architecture for impressive scalability to 384 ports total.
Future protection is provided with 156Gbps switching capacity and expansion with a 10G module slot.
Four dual-purpose slots support SFPs that can connect to fiber cabling for flexible Gigabit Ethernet backbone and server connections.
Product Type Ethernet Switch
Total Number of Network Ports 48
Number of Stack Ports 2
Stack Port Yes
Number of Network (RJ-45) Ports 48
Port/Expansion Slot Details 48 x Gigabit Ethernet Network
Port/Expansion Slot Details 4 x Gigabit Ethernet Expansion Slot
Media & Performance
Media Type Supported Twisted Pair
Ethernet Technology Gigabit Ethernet
Network Technology 10/100/1000Base-T
Number of Total Expansion Slots 5
Expansion Slot Type SFP
Shared SFP Slot Yes
Number of SFP Slots 4
Network & Communication
Layer Supported 3