Cisco Business CBS350-48P-4G — 48-Port Gigabit PoE Managed Network Switch | Enterprise-Grade Intelligence at Scale

The High-Density Managed PoE Switch That Powers, Connects, and Protects Your Entire Business Network

When your network infrastructure needs to support an entire office floor, a full campus wing, or a multi-department enterprise environment — half measures simply will not do. You need a switch that delivers relentless Gigabit performance across every port, intelligent management down to the finest detail, and enough PoE power to energise every connected device in your ecosystem — simultaneously, without compromise, without bottlenecks, and without failure.

The Cisco Business CBS350-48P-4G 48-Port Gigabit PoE Managed Switch is exactly that switch.

Part of Cisco’s industry-defining Business 350 Series — the most trusted managed switching platform in the small and medium business segment globally — the CBS350-48P-4G combines 48 full-speed PoE+ Gigabit downlink ports, four dedicated 1G SFP uplink slots, a 370W PoE power budget, and Cisco’s comprehensive Layer 2+ managed feature set into a sleek 1U rackmountable chassis that means serious business from the moment it powers on.

This is not merely a switch. This is the intelligent heart of a modern, scalable, and secure business network — engineered to perform today, and built to grow with your ambitions for years to come.

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Cisco CBS350-48P-4G — Complete Technical Specifications

Understanding the hardware is the first step to understanding the value. Here is every specification that makes this switch exceptional:

• 48 x 10/100/1000 Mbps PoE+ RJ45 Ports — IEEE 802.3at compliant, up to 30W per port
• 4 x 1G SFP Uplink Ports — dedicated fiber or copper uplink flexibility
• Total PoE Power Budget: 370W — industry-competitive high-density PoE capacity
• Switching Capacity: 104 Gbps — true non-blocking, wire-speed forwarding architecture
• Forwarding Rate: 77.38 Mpps — handles maximum traffic density without packet loss
• MAC Address Table: 16,000 entries — supports large, complex device-dense environments
• Jumbo Frame Support: 9,000 bytes — optimised for NAS, iSCSI storage, and video workflows
• VLAN Support: Up to 4,096 VLANs — granular network segmentation at enterprise scale
• Layer 2+ Managed — full suite of VLANs, QoS, ACLs, STP, SNMP, and 802.1X
• Web-Based GUI Management — intuitive browser interface requiring zero CLI expertise
• SSH v2 & HTTPS Encrypted Management — every management session secured end-to-end
• IPv4 & IPv6 Dual-Stack Support — future-ready for next-generation network architectures
• Cisco Business Dashboard Compatible — free centralised multi-device management
• 1U Rackmountable Form Factor — standard 19-inch rack ready out of the box
• Cisco Limited Lifetime Hardware Warranty — the gold standard of hardware confidence

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48 Ports of Pure Gigabit Performance — No Compromise, No Exceptions

Full Speed to Every Desk. Every Device. Every Moment.

In the modern business environment, bandwidth is oxygen. Every workstation, every VoIP handset, every IP camera, every wireless access point, and every IoT endpoint on your network deserves — and now demands — full Gigabit connectivity. The CBS350-48P-4G does not disappoint a single device.

With a non-blocking switching fabric rated at 104 Gbps and a forwarding throughput of 77.38 million packets per second, this switch handles simultaneous full-speed traffic across all 48 ports without a single microsecond of hesitation. That is the mathematical guarantee of a truly non-blocking architecture — every port, at full line rate, all at once, always.

What does that mean for your business in real terms?

• Engineering and creative teams transfer enormous CAD files, video project assets, and design archives across the network at full Gigabit speeds — no throttling, no queuing, no waiting
• Finance and operations departments access cloud ERP and database systems with consistent low-latency connections that match the performance of the applications themselves
• Video conferencing rooms powered by Zoom, Microsoft Teams, or Cisco Webex deliver flawless 4K streams without frame drops or buffering artifacts
• IP surveillance systems stream multiple simultaneous high-definition camera feeds to NVR storage without dropped frames or recording gaps
• VoIP telephony deployments enjoy pristine call quality across every extension, protected by hardware-prioritised QoS queuing at the silicon level

The CBS350-48P-4G does not create bottlenecks. It eliminates them — permanently.

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370W PoE Budget Across 48 Ports — Power Your Entire Network Ecosystem From One Device

One Switch. One Cable Per Device. Zero Compromise.

The 370W PoE+ power budget of the CBS350-48P-4G is one of its most operationally transformative capabilities — and it is one that fundamentally changes how you think about deploying and managing powered network devices at scale.

With IEEE 802.3at PoE+ delivering up to 30 watts per port, combined with intelligent per-port power management from the switch’s management interface, you have the flexibility and capacity to power an extraordinary range of business-critical devices:

Wireless Access Points Deploy enterprise-grade Wi-Fi 6 and Wi-Fi 6E access points — from Cisco Business, Meraki, Ubiquiti, Aruba, or any IEEE-compliant vendor — directly from switch ports. Eliminate separate power injectors and the cable chaos they create.

IP Desk Phones & VoIP Handsets Power an entire office floor of VoIP handsets simultaneously. With efficient modern phones drawing just 3-7W each, a large portion of your 48 ports can power telephony deployments with ample budget remaining for other devices.

IP Security & Surveillance Cameras Connect and power HD, 4K, and PTZ IP cameras across your entire premises without running separate power circuits. Centralise both data and power in your network cabinet.

Door Access Controllers & Physical Security Power electronic door locks, card readers, biometric terminals, and intercom systems directly from PoE — simplifying installation and enabling centralised power management of your physical security infrastructure.

Digital Signage Displays Drive compact media players and digital signage controllers from PoE ports — perfect for retail environments, corporate lobbies, and wayfinding systems.

Smart Building IoT Devices Connect occupancy sensors, environmental monitors, smart lighting controllers, and building automation endpoints — the growing IoT ecosystem of the modern intelligent workplace.

Intelligent PoE Management: The CBS350-48P-4G’s management interface allows you to set per-port PoE power priority — ensuring your most critical devices like primary access points and VoIP phones always receive power first. During budget-constrained conditions, lower-priority ports gracefully power down, protecting essential services.

The aggregate impact is dramatic — dramatically simplified installation, reduced cabling costs, lower electrical infrastructure investment, and centralised power control over your entire connected device estate from a single management screen.

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Layer 2+ Managed Intelligence — Total Control of How Your Network Behaves

Stop Reacting to Network Problems. Start Preventing Them.

This is the defining capability that separates the CBS350-48P-4G from every unmanaged switch in its price proximity. Layer 2+ management means you control not just whether traffic flows — but precisely how, where, when, at what priority, and with what security policies it flows. Every feature outlined below is included in the hardware purchase price with no additional licensing costs:

VLAN Segmentation — Build a Logical Network Within Your Physical One

With support for up to 4,096 VLANs, the CBS350-48P-4G enables network architects to create a richly segmented logical infrastructure on a single physical switch:

• Corporate Data VLAN — isolate business-critical workstations and servers from all other traffic
• VoIP VLAN — dedicated VLAN for IP telephony, ensuring voice quality is never degraded by data traffic
• Guest Wi-Fi VLAN — provide internet access to visitors without any exposure to internal corporate resources
• IoT & Building Automation VLAN — isolate smart devices and sensors from your primary data network
• CCTV & Surveillance VLAN — dedicated bandwidth allocation for video streams to NVR storage
• Management VLAN — isolate switch management traffic entirely from user data planes

VLAN segmentation is simultaneously your most powerful performance optimisation tool and your most effective internal security control — and the CBS350 makes implementing it accessible through an intuitive visual web interface.

Quality of Service — Guarantee the Experience Your Applications Deserve

Modern business applications are not equal — and your network should not treat them as if they were. The CBS350-48P-4G implements a comprehensive QoS framework that ensures every application gets the network treatment it needs:

• 802.1p Class of Service — eight hardware-level traffic priority queues
• DSCP Differentiated Services — honour and enforce industry-standard traffic markings
• Strict Priority Queuing — guarantee absolute bandwidth reservation for VoIP and real-time video
• Weighted Round Robin (WRR) — fair bandwidth distribution across non-priority traffic classes
• Ingress Traffic Policing — prevent individual devices from consuming disproportionate bandwidth
• Egress Shaping — smooth traffic bursts to protect downstream devices and WAN connections

The practical result: VoIP calls remain crystal clear even when the marketing team is uploading a 10GB video to cloud storage. Video conferences stay smooth even when the operations team is running simultaneous NAS backups. QoS is the invisible guarantee that your network prioritises business outcomes over raw data throughput.

Access Control Lists — Zero-Trust Security at Every Port

The CBS350-48P-4G implements hardware-accelerated Access Control Lists that enforce security policy at line rate — with zero performance impact on legitimate traffic:

• IP-Based ACLs — permit or deny traffic based on source/destination IP address, protocol, and port
• MAC-Based ACLs — control access based on device hardware addresses
• Time-Based ACLs — restrict network access by time of day and day of week
• Ingress and Egress ACL Application — enforce policies in both traffic directions simultaneously
• VLAN-Based ACLs — apply security policies at the VLAN level for group-wide enforcement

Spanning Tree Protocol — Eliminate Loops, Ensure Resilience

In multi-switch network topologies, the risk of Layer 2 loops — catastrophic broadcast storms that can bring an entire network to its knees in seconds — is real and ever-present. The CBS350-48P-4G eliminates this risk comprehensively:

• IEEE 802.1D Spanning Tree Protocol (STP) — industry-standard loop prevention
• IEEE 802.1w Rapid Spanning Tree (RSTP) — sub-second convergence for faster fault recovery
• IEEE 802.1s Multiple Spanning Tree (MSTP) — per-VLAN spanning tree optimisation
• BPDU Guard — protect access ports from rogue switch connections
• Root Guard — prevent unauthorised switches from becoming STP root bridges
• Loop Guard — additional protection against indirect link failures

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Enterprise Security Features — Protecting Your Network From Every Angle

Because a Fast Network That Is Not Secure Is Not an Asset — It Is a Liability

Cybersecurity threats targeting business networks have never been more sophisticated, more frequent, or more damaging. The CBS350-48P-4G incorporates a comprehensive, multi-layer security architecture that protects your network at the port, VLAN, and management levels simultaneously:

Port Authentication & Device Access Control

• IEEE 802.1X Port-Based Network Access Control — authenticate every device before granting network access using RADIUS-integrated identity verification
• MAC Address Filtering & Locking — restrict which physical devices can connect to specific ports
• Guest VLAN for 802.1X — redirect unauthenticated devices to a restricted guest network automatically

Layer 2 Attack Prevention

• Dynamic ARP Inspection (DAI) — validate ARP packets to prevent ARP spoofing and man-in-the-middle attacks that could intercept sensitive business communications
• IP Source Guard — verify IP-to-MAC address bindings, blocking IP address spoofing at the hardware level
• DHCP Snooping — protect your network from rogue DHCP servers that could redirect traffic through attacker-controlled gateways

Traffic Flood & Storm Protection

• Broadcast Storm Control — automatically throttle broadcast traffic floods that could saturate your network
• Multicast Storm Control — prevent multicast traffic bursts from overwhelming port buffers
• Unknown Unicast Flooding Control — protect against MAC table overflow attacks designed to force promiscuous forwarding
• Hardware DoS Prevention — silicon-level protection against common denial-of-service attack patterns

Encrypted & Role-Based Management

• SSH v2 Encrypted CLI Access — every command-line management session encrypted end-to-end
• HTTPS/SSL Web GUI — browser-based management secured with TLS encryption
• SNMPv3 with Authentication & Encryption — secure network monitoring without credential exposure
• Role-Based Access Control (RBAC) — define granular administrator permissions aligned with team responsibilities
• Dedicated Management VLAN — completely isolate switch administration traffic from user data

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4 x 1G SFP Uplinks — The Gateway to Your Wider Network Infrastructure

Flexible, High-Speed Connectivity to Your Core and Beyond

The four dedicated 1G SFP uplink ports on the CBS350-48P-4G are your switch’s connection to the broader network world — and their flexibility is a genuine competitive advantage:

Fiber Uplinks for Distance and Speed

• Multi-Mode Fiber (OM3/OM4) — connect to distribution switches or fiber patch panels up to 550m away at full Gigabit speed
• Single-Mode Fiber — extend uplinks across campus buildings or between floors with runs exceeding 10km using appropriate SMF SFP transceivers
• Fiber backbone protection — fiber uplinks are immune to electrical interference, ground loops, and lightning-induced surge damage that can affect copper uplinks

Copper SFP Uplinks

• Install Cisco GLC-T or compatible RJ45 SFP modules for flexible copper uplink connections to structured cabling patch panels, routers, or firewalls within standard 100m copper distance limitations

Link Aggregation for Redundancy and Bandwidth

• Combine multiple SFP uplinks using IEEE 802.3ad LACP Link Aggregation to create a bonded uplink with both increased bandwidth and automatic failover redundancy
• A 2-link LACP aggregate delivers 2Gbps of uplink bandwidth with seamless failover if one physical link fails — critical for high-availability network designs

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Network Monitoring & Visibility — See Everything, Miss Nothing

You Cannot Manage What You Cannot See

The CBS350-48P-4G provides exceptional network visibility tools that transform your ability to monitor performance, troubleshoot issues, and plan capacity proactively:

• SNMP v1/v2c/v3 — integrate with industry-standard NMS platforms including PRTG, SolarWinds, Zabbix, and Nagios for centralised network monitoring
• RMON (Remote Monitoring) — detailed traffic statistics, history, alarms, and events per port
• Port Mirroring (SPAN) — mirror traffic from any port or VLAN to a monitoring port for deep packet inspection and network analysis tools
• sFlow — hardware-level traffic sampling for high-performance network analytics
• Syslog — real-time event logging to external syslog servers for audit trails and SIEM integration
• Cable Diagnostics (TDR) — diagnose copper cable faults, measure cable length, and identify wiring issues remotely from the management interface
• Per-Port Traffic Statistics — granular inbound/outbound packet counts, error rates, and bandwidth utilisation graphs in real time

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Cisco Business Dashboard — Unified Management Across Your Entire Cisco Estate

One Interface. Every Device. Complete Visibility.

The CBS350-48P-4G is fully compatible with the Cisco Business Dashboard — Cisco’s free, powerful, and intuitive network management platform designed specifically for small and medium businesses managing multiple Cisco devices:

• Automatic Network Discovery — the dashboard finds and maps every Cisco Business switch, router, and access point on your network automatically
• Unified Firmware Management — schedule and push firmware updates to all devices simultaneously from a single interface
• Network Topology Visualisation — see a live, interactive map of how every device in your network connects and communicates
• Centralised Configuration — apply configuration templates and policy changes across multiple switches simultaneously
• Real-Time Alerts & Notifications — receive immediate notification of device failures, link-down events, and security anomalies
• Multi-Site Support — manage Cisco Business infrastructure across multiple physical locations from a single dashboard instance
• Zero-Touch Provisioning — pre-stage switch configurations for remote branch deployments without on-site IT presence

For businesses with multiple CBS350 switches deployed across different floors, departments, or locations, Cisco Business Dashboard transforms what could be a fragmented management headache into a streamlined, unified operational command centre.

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1U Rackmount Design — Built for the Data Closet, Engineered for Reliability

Professional Infrastructure That Looks and Performs the Part

The CBS350-48P-4G is housed in a robust 1U rackmountable chassis engineered for installation in standard 19-inch equipment racks and network cabinets:

• Standard 1U rack height — efficient use of precious rack space in busy network closets
• Rack-mount brackets included — deploy immediately without additional hardware purchases
• Front-to-back airflow design — optimised for proper rack cooling in equipment cabinets
• Status LEDs per port — visual link, speed, and PoE activity indicators visible from the front panel at a glance
• Durable metal chassis — commercial-grade steel construction rated for 24/7/365 continuous operation
• IEC power inlet — standard rack power connectivity with included power cable

The physical build quality of the CBS350-48P-4G reflects Cisco’s uncompromising hardware standards — this is a switch built to live in a rack for a decade, not a budget appliance that will need replacing in three years.

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Who Is the Cisco CBS350-48P-4G Built For?

High-Density PoE Managed Switching for the Environments That Demand It Most

Corporate Offices & Professional Services Support an entire open-plan office floor with Gigabit connectivity and PoE for every desk phone, providing VoIP, wired workstations, wireless APs, and networked printers from a single switch — with VLAN segmentation keeping HR, finance, and operations traffic appropriately separated.

Education Campuses & Schools Connect and power entire classrooms of devices — student laptops, interactive whiteboards, teacher workstations, and Wi-Fi 6 access points — with VLAN isolation between student, staff, and administrative networks and time-based ACLs enforcing appropriate access policies.

Healthcare Facilities & Medical Practices Deliver high-speed, VLAN-segmented connectivity for clinical workstations, medical imaging systems, nurse call infrastructure, and patient entertainment networks — with 802.1X authentication ensuring only authorised clinical devices access sensitive patient data systems.

Hospitality — Hotels, Restaurants & Venues Power and manage guest Wi-Fi access points, IP PBX telephone systems, CCTV surveillance cameras, digital signage, and POS terminals simultaneously — with complete VLAN separation ensuring guest traffic never touches back-office financial systems.

Retail Chains & Multi-Outlet Operations Standardise on CBS350-48P-4G hardware across all locations for consistent network policy enforcement, centralised management via Cisco Business Dashboard, and PoE-powered device deployments that minimise installation costs at every site rollout.

Manufacturing & Warehousing Connect production floor terminals, warehouse management system endpoints, barcode scanners, VoIP handsets, and IP camera arrays on a managed, segmented network with the visibility to monitor performance and troubleshoot connectivity issues remotely.

Government & Public Sector Meet the demanding compliance, security, and audit requirements of public sector networking with 802.1X authentication, encrypted management, ACL-enforced access controls, and comprehensive syslog audit trails.

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Frequently Asked Questions About the Cisco CBS350-48P-4G

Q: How does the CBS350-48P-4G compare to the Cisco Catalyst 9300 series? The CBS350-48P-4G is positioned within Cisco’s Business Series for small and medium businesses, while the Catalyst 9300 targets enterprise and large campus deployments. The CBS350 delivers Layer 2+ management with comprehensive SMB features at a significantly lower price point, without the advanced SD-Access, EVPN, or Cisco DNA Center integration capabilities of the Catalyst series. For most SMB and mid-market deployments, the CBS350’s feature set is comprehensively sufficient.

Q: What is the total PoE power budget and how is it managed? The CBS350-48P-4G provides a 370W total PoE budget shared across all 48 ports. Each port supports up to 30W (PoE+ / IEEE 802.3at). The switch’s management interface allows you to set per-port PoE power allocation limits and priorities, ensuring critical devices always receive power. If total device demand approaches the 370W ceiling, the switch uses port priority settings to determine which ports maintain power.

Q: Does this switch support stacking? The CBS350-48P-4G does not support hardware-level physical stacking in the traditional sense. However, multiple units can be managed cohesively through Cisco Business Dashboard, providing unified firmware management, configuration deployment, and network visibility across all switches simultaneously — achieving much of the operational simplicity of stacking from a management perspective.

Q: What SFP transceivers are compatible with the CBS350-48P-4G? The switch is compatible with Cisco Business SFP transceivers including MGBSX1 (multi-mode fiber), MGBLX1 (single-mode fiber), MGBT1 (copper RJ45), and other standard 1G SFP modules. Cisco-branded SFPs are recommended for guaranteed compatibility and warranty coverage, though many third-party IEEE-compliant SFP modules also function correctly.

Q: Can I manage the CBS350-48P-4G without any networking expertise? The CBS350’s web-based GUI is among the most intuitive in the managed switch market — featuring guided setup wizards, visual port configuration, and contextual help throughout. Users with basic networking knowledge can configure VLANs, QoS, and security features successfully. For complex deployments, Cisco’s extensive online documentation and the Cisco Business support community provide comprehensive guidance.

Q: Does the CBS350-48P-4G support IPv6? Yes. The switch provides full dual-stack IPv4 and IPv6 support, including IPv6 management interfaces, IPv6 ACLs, MLD snooping for IPv6 multicast, and DHCPv6 snooping — ensuring complete compatibility with both current and next-generation network addressing architectures.

Q: What warranty protection does Cisco provide? Cisco provides a Limited Lifetime Hardware Warranty on the CBS350 series, covering manufacturing defects under normal operating conditions for the lifetime of the product, supported through Cisco’s global partner and distribution network.

Q: Is the CBS350-48P-4G compatible with non-Cisco network equipment? Absolutely. The CBS350-48P-4G implements industry-standard protocols — including STP, RSTP, LACP, LLDP, 802.1X, SNMP, and standard PoE — ensuring full interoperability with networking equipment from any vendor. It slots seamlessly into mixed-vendor environments alongside firewalls, routers, and wireless controllers from any manufacturer.

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The Bottom Line — Why the Cisco CBS350-48P-4G Is the Managed PoE Switch Your Network Has Been Waiting For

Your network is the circulatory system of your business. Every application, every communication, every customer interaction, and every operational process flows through it. Choosing the switch at the heart of that infrastructure is not a decision to take lightly — and it is not a decision where compromise is acceptable.

The Cisco Business CBS350-48P-4G gives you everything your growing business demands from a high-density managed PoE switch: the port count to connect your entire team, the PoE budget to power your entire device ecosystem, the management intelligence to control every aspect of how your network behaves, and the security features to protect every connection from modern threats — all backed by Cisco’s incomparable hardware reliability and lifetime warranty guarantee.

• ✅ 48 x PoE+ Gigabit ports — connect and power every device across your entire operation
• ✅ 370W PoE budget — capacity for access points, cameras, phones, and IoT simultaneously
• ✅ 104 Gbps non-blocking switching fabric — wire-speed performance at maximum port density
• ✅ Layer 2+ full managed feature set — VLANs, QoS, ACLs, 802.1X, STP, and SNMP included
• ✅ 4 x 1G SFP uplinks — fiber or copper, with LACP link aggregation support
• ✅ 16,000 MAC address table — handles the most device-dense enterprise environments
• ✅ Up to 4,096 VLANs — granular network segmentation at true enterprise scale
• ✅ Cisco Business Dashboard — free unified multi-device management platform
• ✅ 1U rackmount chassis — professional data closet ready, brackets included
• ✅ Cisco Limited Lifetime Warranty — the ultimate assurance of hardware investment protection