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3COM 3CR17181-91 5500-El 28-Port FX Switch (24 SFP ports, to be populated with 100BASE-X SFP transceivers with multi- or single-mode connectors; 2 Gigabit SFP and 2 10/100/1000 ports)

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Condition: Refurbished
Packaging: Single Box
UPC: 662705488028

Availability: Out of stock



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  • 24 SFP ports, to be populated with 100BASE-X SFP transceivers with multi- or single-mode connectors; 2 Gigabit SFP and 2 10/100/1000 ports
  • Scalable stackable design with resilient stacking up to eight units high, or 384 Fast Ethernet ports using 2 Gbps stacking bandwidth (4Gbps full duplex)
  • 12.8 Gbps switching capacity, 9.5 Mpps forwarding rate, maximum
  • Wirespeed performance across all ports within a stack delivers optimal throughputs and bandwidth for business-critical data and high-speed communications
  • Multi-layer operation with static routes, RIP-based Layer 3 functionality, OSPF, and PIM-DM and PIM-SM
  • 3Com XRN Stacking Technology provides for the creation of eight-unit stacks that offer chassis-like availability and resiliency over traditional aggregated-trunk configurations. The entire stack is managed as a single-IP management entity, with \"masterless\" sharing of critical routing information across all units for fast failure recovery
  • Load-sharing and cross-stack trunking features help eliminate dropped packets, clear up traffic bottlenecks, and improve server availability
  • Integrated distributed security enforcement
  • Advanced, time-based Access Control Lists (ACLs) help safeguard key network resources from unauthorized access and data corruption
  • User-based authentication and DES 56-bit or 168-bit encryption help secure Layer 3 protocols and management controls
  • Shared 3Com Operating System consolidates administrative control over the entire switching infrastructure - contributing to a more unified network environment and providing unparalleled edge-to-core visibility and control
  • Built-in support for AC- and DC-powered operations enables you to leverage existing power schemes and cost-effectively extend power to the edge of the network
  • Available DC Redundant Power Supply (RPS), designed by Eaton Powerware Corporation, a leading provider of integrated power systems


Ports:24 SFP ports, to be populated with 100BASE-X SFP transceivers with multi- or single-mode connectors; 2 Gigabit SFP ports; 2 auto-negotiating 10BASE-T/100BASE-TX/1000BASE-T ports configured as auto MDI/MDIX; RPS power port (-48 VDC); RJ-45 console port 
Stacking:Up to 8 switch units, 384 10/100 ports; 3Com XRN Stacking linked in active/active load-sharing configuration via front panel SFP ports 
Layer 2:IEEE 802.Q VLANs, 802.3ad LACP, 802.3x full-duplex flow control, 802.1D STP, 802.1w RSTP, Fast Start with BDPU protection, IGMP v1/v2 multicast filtering 
Layer 3:Hardware-based routing, ECMP, ARP, virtual interfaces, static/dynamic routing, RIPv1/v2, OSPF, ASIC Layer 3 forwarding, PIM-DM, PIM-SM, IGMP v1/v2 snooping, DHCP Relay 
Resiliency:IEEE 802.3ad LACP, hot-swappable switch units, DC RPS provides N+1 power redundancy, seamless failover between AC and DC modes 
Convergence:Weighted Round Robin/Fair/Strict Priority Queuing, IEEE 802.1p Class of Service/Quality of Service (CoS/QoS), IPv6 classification, prioritization and filtering, ingress/egress rate limiting, webcache-based bandwidth management 
Security:RADIUS; PAP/CHAP/EAPoL (EAP over LAN) authentication; session accounting; SSHv1.5; Access Control Lists; packet filtering; SNMP v3 encryption, IEEE 802.1X Network Login; authentication, VLAN autoinitiation and QoS profiling; multilevel access privileges; administrative password recovery; management activity logs 
Operating system:3Com Operating System; shared with 3Com Switch 8800, 7700 and Router 6000 
3Com management:3Com Network Supervisor, 3Com Network Director, 3Com Enterprise Management Suite 
Other management:Web-based GUI, SNMP, telnet, CLI, RMON-1 (statistics, history, alarms, events), SMON, multiple software images, bank swap statistics gathering and reporting, remote polling/ping (unicast mode only), software backup/restore, Xmodem, FTP, TFTP, telnet, IP address allocation via manual/DHCP/BOOTP 
Network debugging tools:DHCP tracker, UDP helper, traceroute, 1-1 traffic mirroring (standalone unit only) 
Built-In power supply:50/60 Hz AC; 90-240 VAC input; 1.0 A maximum; supports multiple power modes: AC-only, AC and DC, DC-only 
DC Redundant Power Supply (RPS):Available standards-based DC RPS designed by Eaton Powerware Corporation, leading provider of integrated power systems 
IEEE standards:IEEE 802.1D (STP), 802.1p (CoS), 802.1Q (VLANs), 802.1w (RSTP), 802.1X (Security), 802.3 (Ethernet), 802.3ad (Link Aggregation), 802.3ab (1000BASE-T), 802.3i (10BASE-T), 802.3u (Fast Ethernet), 802.3x (Flow Control), 802.3z (Gigabit Ethernet) 
Emissions:CISPR 22 Class A, FCC Part 15 Class A, EN 55022 1998 Class A, ICES-003 Class A, VCCI Class A, EN 61000-3-2 2000, 61000-3-3 
Immunity:EN 55024
Safety agency certifications:UL 60950, IEC 60950-1, EN 60950-1, CAN/CSA-C22.2 No. 60950
Reliability:MTBF 38 years (184,000 hours)
Physical Dimensions:Height: 43.6 mm (1.7 in or 1U); width: 440 mm (17.3 in), depth: 427 mm (16.8 in or 1U)