Cisco CBS350-24S-4G Full English Product Description
1. Short Sales Title (For Quotation & E-commerce Listing)
Cisco CBS350-24S-4G Business 350 Series 24-Port Pure Gigabit SFP Fully Managed Layer 3 Switch, Global Standard Version, 4 Dedicated Gigabit SFP Uplink Slots, Dual-Stack IPv4/IPv6 Dynamic Routing, True Stackable, Fanless 1RU Rackmount Fiber Aggregation Switch
2. Official Product Overview
The Cisco CBS350-24S-4G is a pure fiber fully managed Layer 3 switch in the Cisco Business 350 Series portfolio. The suffix "S" denotes dedicated Gigabit SFP fiber access ports with zero copper RJ45 interfaces, while "4G" stands for four independent Gigabit SFP uplink slots (all 1G, non-10G SFP+). Designed for global multi-building fiber interconnection, fiber surveillance backhaul, optical storage aggregation and remote branch fiber wiring closets without PoE or copper access requirements.
Superior to entry CBS250 smart switches, CBS350 delivers full enterprise managed functions: dynamic Layer 3 routing, true stacking, complete anti-spoofing security suite, sFlow traffic analytics and advanced multicast control. This all-fiber switch eliminates copper cabling distance limitations, supporting long-distance single/multi-mode fiber links for campus cross-building networks, factory optical monitoring and fiber NAS access.
It equips 24 dedicated Gigabit SFP fiber access ports plus 4 standalone Gigabit SFP uplink slots, providing 28 total Gigabit fiber interfaces for flexible multi-link fiber aggregation. Powered by high-performance ARM processor with 512MB DRAM and 256MB flash memory, it delivers 56 Gbps non-blocking switching capacity and 41.66 Mpps wire-speed forwarding rate for 64-byte frames, equipped with a 1.5MB shared dynamic packet buffer to avoid congestion under fiber-transmitted multi-camera 4K streams and cross-site file transfers. Fanless passive cooling ensures silent deployment in equipment rooms, server racks and off-site monitoring stations.
3. Port & Hardware Specifications
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24 × dedicated Gigabit SFP fiber access slots (No copper RJ45 ports, Zero PoE support)
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4 × dedicated Gigabit SFP uplink slots (4G = four 1G fiber-only non-combo slots, distinct from 4X 10G SFP+ models)
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Compatible Cisco SFP transceivers: MGBSX1 multimode, MGBLX1/MGBLH1 single-mode, MGBT1 copper SFP
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Internal universal AC power supply: 100–240V 50/60Hz global standard power cord
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Silent fanless passive cooling design, zero acoustic noise
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Switching Capacity: 56 Gbps
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Forwarding Rate (64-byte packets): 41.66 Mpps
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Shared Packet Buffer: 1.5 MB
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MAC Address Table: 16K entries; Jumbo Frame support up to 9000-byte MTU
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Dual console ports: RJ45 serial console + mini USB port for offline local CLI configuration
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Front-panel USB Type-A port for offline config backup & firmware upgrade
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True stacking capability: stack up to 4 CBS350 series switches under single IP unified management, cross-stack LAG/VLAN/QoS/mirroring supported
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Form Factor: 1RU standard rackmount chassis, support rack mount, wall mount and desktop placement
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Dimensions: 445 × 240 × 44 mm (17.5 × 9.45 × 1.73 inches)
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Weight: 1.85 kg (4.08 lbs)
4. Comprehensive Layer 2 Switching Functions
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Up to 4096 IEEE 802.1Q tagged VLANs, port-based VLAN, voice VLAN, guest VLAN, private VLAN, dedicated management VLAN
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8 priority egress queues with Strict Priority / WRR / SPQ QoS scheduling to prioritize fiber-transmitted VoIP, surveillance video and business data traffic
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IEEE 802.3ad LACP link aggregation, multiple LAG groups for bandwidth expansion & link redundancy, cross-stack LAG support
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IGMP Snooping v1/v2/v3 with built-in IGMP Querier, supporting up to 1024 multicast groups for IPTV and fiber IP surveillance
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LLDP & LLDP-MED automatic endpoint discovery for fiber cameras, optical media converters and fiber-connected APs
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Port mirroring, VLAN mirroring, RSPAN remote mirroring, RSTP/MSTP/PVST+ spanning tree, BPDU Guard, Root Guard, Loop Guard
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Broadcast/multicast/unicast storm control to prevent fiber link flooding failures
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Enterprise anti-spoofing toolkit: DHCP Snooping, Dynamic ARP Inspection (DAI), IP Source Guard, IP/MAC/Port Binding
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sFlow traffic monitoring for real-time fiber link bandwidth analysis and fault troubleshooting
5. Advanced Dual-Stack Dynamic Layer 3 Routing
Far exceeding static-only routing on CBS250 smart switches, CBS350 provides full wire-speed Layer 3 forwarding:
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Dynamic routing protocol: RIPv2 for IPv4
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Up to 990 IPv4 static routes, 990 IPv6 static routes, 128 Layer 3 VLAN interfaces
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Native dual-stack IPv4 & IPv6 wire-speed forwarding, CIDR aggregation, full IPv6 first-hop security (ND Inspection, RA Guard)
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Built-in IPv4 DHCP Server & DHCP Relay with Option 82, UDP relay functionality
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Policy-Based Routing (PBR) for flexible traffic steering across fiber-separated network segments
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Direct inter-VLAN routing without external routers to reduce core gateway latency and bandwidth load for cross-building fiber networks
6. Enterprise-Grade Multi-Layer Security Suite
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IEEE 802.1X port-based authentication with RADIUS/TACACS+ centralized access control, web-based captive portal authentication
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Port security, static/dynamic MAC address binding, automatic port shutdown for unauthorized fiber-connected terminals
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Comprehensive DoS attack suppression, hardware accelerated L2-L4 ACL traffic filtering for fiber access control
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Encrypted management channels: HTTPS web GUI, SSH multi-privilege CLI, SCP file transfer, SNMPv3 secure remote monitoring
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Persistent syslog event logging, built-in cable diagnostic tools, mandatory password complexity policy
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Independent guest network isolation, Private VLAN Edge (PVE) for fiber client separation
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Secure boot, encrypted configuration file storage to block unauthorized configuration tampering, IPv6 ND Inspection & RA Guard against IPv6 fiber spoofing
7. Energy-Saving Green Technologies
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IEEE 802.3az Energy Efficient Ethernet (EEE): auto power reduction for idle SFP/fiber links
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Dynamic power tuning based on link status to cut idle power consumption
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Port LED dimming or full shutdown mode for unmanned fiber wiring closets
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Low-power fanless hardware design with minimal heat generation and extended service lifespan
8. Multi-Mode Local & Remote Management
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Intuitive graphical web management interface (HTTP/HTTPS) with basic & advanced operation modes
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Dual offline local console access: serial RJ45 + mini USB port for offline CLI configuration
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SSH secure remote command line management with multi-user privilege levels (1 / 7 / 15)
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SNMP v1/v2c/v3 compatible with third-party network monitoring platforms, native sFlow support
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TFTP/SCP/offline USB firmware upgrade, dual redundant firmware images for reliable zero-downtime upgrades
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SNTP time synchronization, ping & traceroute diagnostic tools, Smartport auto-provisioning templates for fiber endpoints
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Single IP stacking management for centralized batch control of up to 4 stacked CBS350 switches
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Fully compatible with Cisco Business Dashboard & Cisco Business Mobile App for unified topology visualization and zero-touch fiber network deployment
9. Physical & Environmental Parameters
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Operating Temperature: -5°C to 50°C; Storage Temperature: -25°C to 70°C
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Operating Humidity: 10%–90% non-condensing relative humidity
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Global compliance standards: CE, RoHS, UL, FCC Class A
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MTBF: 909,838 hours at 25°C ambient temperature
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Warranty: Cisco Limited Lifetime Hardware Warranty
10. Typical Deployment Scenarios
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Global campus fiber core aggregation switch for multi-building single-mode fiber interconnection
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Remote factory fiber monitoring backhaul switch linking workshop IP cameras to central control room
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Medium enterprise fiber SAN access switch for centralized NAS storage via Gigabit fiber links
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Large retail chain fiber backbone switch connecting off-site surveillance rooms to headquarters
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Stackable multi-switch fiber SMB network leveraging true stacking and dynamic Layer 3 routing for cross-site fiber traffic forwarding
11. Standard Package Contents
1 × Cisco CBS350-24S-4G Pure SFP Fiber Fully Managed Gigabit Switch (Global Standard Version)
1 × Global standard AC power cord
Rack mounting brackets and installation screws
Quick Start Guide & global regulatory compliance documents
Short Commercial Version (For Product Ads & Listing Titles)
The Cisco CBS350-24S-4G is a global pure fiber 24-port Gigabit fully managed switch with 24 dedicated SFP fiber access slots and 4 dedicated Gigabit SFP uplink ports (4G = four 1G fiber uplinks, not 10G SFP+). Featuring dynamic dual-stack IPv4/IPv6 Layer 3 routing, true stacking capability, enterprise anti-spoofing security, full QoS and fanless silent design, it delivers wire-speed long-distance fiber connectivity for cross-building interconnection, fiber surveillance and optical storage devices in fiber-centric medium-to-large businesses and campus core wiring closets, supporting rack/wall/desktop deployment, energy-efficient hardware and Cisco Limited Lifetime Hardware Warranty.
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