Name: 🔌 D-Link Dgs-1248T 48 Ports Gigabit Manageable Smart Switch Layer 2 🌐
Brand: D-LINK
SKU: RDC M3 Dgs-1248T
Price: 69.9 EUR
Availability: InStock

🔌 Switch D-Link Dgs-1248T 48 Ports Gigabit Manageable Smart Switch Layer 2 🌐 D-LINK

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Tested and functional - Supplied with power cable. CPU indicator blinks

D-Link DGS-1248T Smart Switch

🔌 D-Link DGS-1248T Switch - 48 Gigabit Ethernet 10/100/1000 Ports - Smart Manageable Web - 4 Combo SFP Ports - Layer 2 - 1U Rack 🌐

💼 Intelligent 48-Port Gigabit Switch for SMB and Professional Networks

✨ D-Link DGS-1248T Switch tested and 100% functional, an intelligent network solution offering high-density Gigabit connectivity with intuitive Web management. This smart manageable switch combines 48 auto-negotiable 10/100/1000 Mbps Gigabit Ethernet RJ-45 ports, 4 combo Mini GBIC/SFP ports for flexible fiber uplinks, and advanced Layer 2 features including 802.1Q VLANs, traffic prioritization QoS, LACP link aggregation, and port security for enterprise, campus, and SMB infrastructure deployments requiring reliable performance at controlled costs.

💡 CPU Indicator Information: The CPU indicator normally blinks during operation, indicating that the switch’s processor is actively handling network traffic and switching operations. This behavior is perfectly normal and confirms the switch is operational. A steady or off CPU indicator would signal an anomaly. The blinking confirms healthy system activity.

📋 Complete Technical Specifications

🔧 Model D-Link DGS-1248T
Smart Switch Web Manageable
SMB/Enterprise Range

🔌 Gigabit Ethernet Ports 48 RJ-45 Ports
10/100/1000Base-T
MDI/MDI-X Auto-Negotiation
Full/Half Duplex

🚀 Combo SFP Ports 4 Dual-Personality Ports
Mini GBIC/SFP Slots
1000Base-SX/LX Fiber
Shared Ports 45-48

🧠 Switching Capacity Bandwidth: 96 Gbps
Forwarding Rate: 71.4 Mpps
Non-Blocking Architecture

💾 Memory SDRAM: 64 MB
Flash Memory: 8 MB
Buffer Packets: 4.1 MB

📊 Layer 2 Features Intelligent Switching
VLAN, QoS, Trunking
IGMP Snooping, Port Mirror

🔐 Security 802.1X Authentication (RADIUS)
Port Security MAC
Access Control Lists (ACL)

🌐 VLANs Support 256 Simultaneous VLANs
4096 VLAN IDs
802.1Q Tagging, Port-Based

🎯 QoS (Quality of Service) 4 Priority Queues
802.1p CoS
DSCP Classification

🔄 Redundancy & Trunking STP/RSTP Spanning Tree
LACP Link Aggregation
802.3ad Port Trunking

🖥️ Management HTTP/HTTPS Web Interface
CLI Console Telnet/SSH
SNMP v1/v2c/v3
RMON Monitoring

📏 Form Factor 1U Rack (44 mm height)
Standard 19 inches
440 x 300 x 44 mm (L x D x H)

⚖️ Weight Approximately 4.5 kg

⚡ Power Supply 100-240 VAC Auto-Ranging
50-60 Hz
Power Consumption: 65W max
Cable included

🌡️ Temperature Operating: 0-50°C
Storage: -40 to 70°C
Humidity: 10-90% non-condensing

🏭 Manufacturer D-Link Systems
SMB/Enterprise Quality
Global Network Leader

📦 Condition Used - Tested and Functional
Power Cable Included

🎯 Key Features of the D-Link DGS-1248T

48 High-Density Gigabit Ports - Abundant 10/100/1000 Mbps connectivity for workstations, network printers, departmental servers, IP surveillance cameras, and WiFi access points with auto-negotiation of speed and duplex optimizing performance automatically based on connected devices
Smart Switch Web Management - Intuitive HTTP/HTTPS graphical administration interface accessible via browser without proprietary software, allowing VLAN, QoS, trunking, port security configuration, and performance monitoring by network administrators without complex CLI expertise
VLAN Network Segmentation - Support for 256 simultaneous VLANs with 802.1Q tagging isolating departments, segmenting voice, data, and video traffic, and creating secure guest WiFi networks separated from production infrastructure for GDPR security compliance
Intelligent QoS Prioritization - 4 priority queues per port with 802.1p CoS and DSCP classification ensuring bandwidth for critical VoIP telephony, HD videoconferencing, and SaaS cloud services without latency impacting communication quality
4 Flexible Combo SFP Ports - Mini GBIC/SFP fiber uplinks enabling long-distance multimode SX (550m) or singlemode LX (10km) connections to the core network, between campus buildings or data center links without copper Cat5e/Cat6 distance limitations
Multilayer Security - 802.1X RADIUS authentication for granular user network access control, MAC address port security limiting unauthorized connections, and Access Control Lists (ACL) filtering traffic based on defined IP/MAC address criteria
Trunking and Redundancy - LACP link aggregation combining multiple physical ports to increase aggregated bandwidth and fault tolerance, spanning-tree protocols STP/RSTP eliminating network loops in redundant high-availability topologies
Energy Efficiency - Optimized consumption of 65W maximum compared to similar competing switches, D-Link Green energy-saving technologies automatically disable unused ports and adjust power based on detected cable lengths, reducing data center electricity costs

🔍 Professional Applications and Uses

The D-Link DGS-1248T Smart Switch is perfectly suited for multiple professional environments: access switch for office patch panels connecting user workstations, multifunction printers, and centralized IP phones; SME infrastructure requiring VLAN management for Accounting/HR/Production departments with secure isolation preventing inter-department communication; university campus networks with computer rooms and libraries connecting hundreds of student stations with RADIUS authentication access control; hotels and hospitality establishments with connected rooms and strict separation between guest WiFi networks and secure management/admin networks; retail stores with point-of-sale terminals, barcode readers, and centralized IP video surveillance systems; small data centers hosting virtual servers requiring VLAN segmentation to isolate clients and ensure confidentiality; integration of VoIP systems like Asterisk/3CX with prioritized QoS guaranteeing audio quality for phone calls; or IP video surveillance infrastructures managing 40+ megapixel H.264 cameras with dedicated VLANs separating video streams from business data traffic. It is also an ideal solution for IT labs and technical training, industrial environments connecting Modbus TCP/IP programmable controllers, or temporary event networks for seminars and conferences requiring fast connectivity and simple deployment.

📸 Important: Photos are provided for illustration only. Only the exact content mentioned in this listing is valid for the product reference and included items. If you have any doubts about the condition or configuration, please contact us before purchasing.

💡 CPU Indicator and LED Indicators

Explanation of the Blinking CPU Indicator

The CPU indicator normally blinks during regular switch operation, indicating the internal processor is actively processing network packets, managing MAC address tables, executing spanning-tree protocols, and responding to SNMP management requests. The blinking frequency varies proportionally with network load: slow blinking indicates low idle traffic, rapid blinking signals intense activity with significant data transfers. This behavior confirms the electronic system is functioning properly.

Other Front Panel LED Indicators

Power LED (Power Supply): Solid green indicates the switch is properly powered.
Link/Act LEDs Ports 1-48: Green indicates active connection, rapid blinking signals data transmission/reception.
Speed LEDs: Different colors distinguish speeds: 10 Mbps (off), 100 Mbps (orange), and 1000 Mbps Gigabit (green).
SFP LEDs: Indicate status of installed fiber optic transceiver modules on combo ports.

✅ Condition and Warranties

Tested and 100% Functional - Switch verified operational including POST power-on self test, validation of 48 Gigabit ports with patch cable link-up tests, basic VLAN configuration via web interface, and LED monitoring confirming normal CPU and power operation
Power Cable Included - Standard EU power cord provided allowing immediate use upon receipt without need to purchase additional separate accessories
30-Day Warranty - Protection against hardware defects preventing normal operation (non-working ports, faulty power supply, processor not booting) with return and exchange under legal conditions
Factory Configuration - Switch reset to factory default settings allowing clean personalized configuration according to specific network environment without interference from previous configurations
All consumables are original and authentic brand - We do not sell any compatible toner or cartridges
Secure Fast Shipping - Professional packaging with shockproof foam protection and carrier tracking number for full delivery traceability
Professional Invoice - Paper invoice with 0% VAT included in each package for business accounting

⚠️ Disclaimers

Software and Technical Support:

No CD-ROM utilities, paper documentation, or user manuals provided; all technical documentation can be downloaded free from the official D-Link support site support.dlink.com according to model reference
We do not provide technical support for advanced VLAN trunking configuration, complex QoS settings for specific applications, RADIUS server integration for 802.1X authentication, spanning-tree loop troubleshooting, or CLI scripting automation assistance for deployments
SFP Mini-GBIC fiber optic transceiver modules not included unless otherwise stated, available separately on the market (D-Link DEM-310GT/DEM-311GT or third-party MSA standard compatibles)
Ethernet Cat5e/Cat6 patch cords, RS-232 console cables, rack mounting kits, brackets, or optional accessories not explicitly mentioned are not included
Pre-installed firmware version available at decommissioning, latest firmware updates available on D-Link site; buyer responsible for upgrades as needed for features and security
For complex multi-site network deployments, integration of heterogeneous existing Cisco/HP/Juniper infrastructures, ANSSI security compliance audits, or administrator training, we recommend certified network integrator services or specialized independent consultants.

❓ Frequently Asked Questions (FAQ)

🔹 What is the difference between a Smart Switch and a fully Managed Switch?

D-Link Smart Switches like the DGS-1248T are an intermediate category between basic unmanaged switches and fully-managed enterprise-class switches like Cisco Catalyst. Smart Switches offer essential Layer 2 features (VLANs, QoS, trunking, port security, IGMP snooping) via a user-friendly web interface accessible to intermediate-level network administrators, while omitting advanced Layer 3 features like complex IP routing (OSPF/BGP), virtual stacking, supervisor hardware redundancy, or full scriptable CLI. This simplification reduces acquisition costs by 50-70% compared to equivalent fully-managed switches while covering 90% of typical SME needs. Ideal for organizations with 50-200 users requiring basic management without investing in CCNA/CCNP certifications or premium Cisco/HP budgets. For simple office environments without VLANs or QoS, unmanaged switches suffice. For high-availability datacenters with complex Layer 3 routing, prefer fully-managed enterprise switches from Cisco/HP/Juniper.

🔹 Does the blinking CPU light indicate a problem with the switch?

No, absolutely not! The blinking CPU light is a completely normal and healthy behavior indicating that the switch processor is working correctly by actively processing network traffic. Just as a computer processor uses CPU cycles to handle tasks, the switch processor manages packet switching between ports, updates MAC forwarding tables, executes network protocols (STP, LACP, IGMP), and responds to SNMP management requests. The blinking speed reflects the load: slow = low traffic idle, fast = intense activity with heavy transfers. An abnormal situation would be the CPU light being permanently off or solid without blinking, suggesting the processor is frozen or crashed and requires a reboot. The blinking LED proves the electronics are alive and operational. Similar to a hard drive activity light blinking during reads/writes confirming system health, an active CPU light reassures network administrators that the switch is processing traffic normally. D-Link documentation explicitly confirms CPU blinking = normal expected operation.

🔹 How to access the web management interface of the DGS-1248T?

Initial configuration to access the web interface requires a direct connection to the switch via an Ethernet cable from any port to a computer configured with a static IP address in the same subnet as the switch’s default (usually 10.90.90.90 according to D-Link documentation, check the switch label). From a web browser (Chrome, Firefox, Edge), enter the management IP address https://10.90.90.90 to reach the login page. Default factory credentials: username "admin" and blank password (depending on firmware version, consult documentation). Once connected to the D-Link Smart Console graphical interface, immediately change the management IP address to match the production subnet (e.g., 192.168.1.250), set a strong admin password for security, then deploy VLAN/QoS/port configurations as needed. The web interface is organized into intuitive menus: System, Port, VLAN, QoS, Security, allowing point-and-click configuration without CLI expertise. For remote management access after IP configuration, ensure proper network routing and consider securing administration with HTTPS instead of unencrypted HTTP for sensitive Internet access. A CLI alternative is available via Telnet (TCP port 23) for administrators preferring scriptable command-line automation for multiple switch deployments.

🔹 Can I use third-party compatible SFP modules on the combo ports?

Yes, generally, the D-Link DGS-1248T accepts third-party compatible SFP/Mini-GBIC transceiver modules that comply with the industry MSA (Multi-Source Agreement) standard, not just the expensive original D-Link modules DEM-310GT/DEM-311GT. Compatible modules from reputable brands like FS.com, 10Gtek, Fiberstore, or StarTech mostly work without link detection issues, offering 60-80% savings compared to OEM manufacturer modules. Compatibility points to watch: prioritize modules explicitly certified as compatible with D-Link switches if vendor information is available, verify appropriate wavelengths for your application (850nm SX multimode for short distances OM1/OM2 up to 550m, 1310nm LX/LH singlemode for long distances OS1/OS2 up to 10-40km), and test modules on reception to validate link-up and Gigabit negotiation before production deployment. Some older generation D-Link switches with restrictive firmware reject non-OEM modules showing incompatibility warnings, usually resolved by recent firmware updates. For critical production environments with strict manufacturer warranties, use original D-Link modules to eliminate incompatibility and support risks. For test labs with tight budgets, third-party compatible modules offer excellent value and generally satisfactory reliability.

🔹 What is the actual power consumption and noise level of the switch?

The D-Link DGS-1248T consumes about 40-50W under normal production load (20-30 active ports, moderate traffic) and can reach a maximum of 65W according to manufacturer specifications under full load with all 48 ports used simultaneously and active SFP modules. In comparison, similar 48-port Gigabit switches from competitors consume 70-90W, positioning the D-Link as energy-efficient thanks to D-Link Green technologies that automatically disable unused ports and adjust transmission power based on detected cable lengths. Annual electricity cost calculation: average 50W × 24h × 365 days × €0.20/kWh = about €88/year electricity versus €150+ for power-hungry switches, resulting in significant cumulative savings in multi-switch datacenter infrastructures. Noise level is moderate: the switch includes an internal cooling fan generating about 30-35 dB in a quiet environment, audible nearby but not disturbing in normally air-conditioned server rooms or office patch cabinets. Much quieter than enterprise Cisco/HP switches with higher densities and multiple high-speed fans. Acceptable for installation in technical rooms, silent cabinets with perforated doors, or under desks if the environment is already noisy. Avoid installation in quiet open spaces near concentrated workstations.

🔹 Is the DGS-1248T switch suitable for an IP video surveillance network?

Yes, absolutely, the DGS-1248T is an excellent choice for IP video surveillance switches, centralizing 40-48 megapixel resolution cameras on a single infrastructure. Its 96 Gbps non-blocking bandwidth guarantees sufficient throughput for simultaneous video traffic: 48 cameras at 2MP each encoded in H.264 at 4 Mbps = 192 Mbps aggregated, easily manageable by Gigabit/SFP uplinks to the NVR recorder. Critical surveillance features include: dedicated VLANs isolating camera video streams from business data traffic to secure access and viewing; priority QoS ensuring minimal latency for real-time streaming and live monitoring without stuttering or buffering; IGMP snooping optimizing multicast streams for cameras viewed simultaneously by multiple clients, avoiding network flooding; and passive PoE on some D-Link models powering cameras (note: the DGS-1248T standard is non-PoE, so check if separate midspan PoE injectors are needed if cameras are powered via Ethernet). Port mirroring allows duplication of traffic from a specific port to a probe for forensic analysis and security incident investigations. The 48-port budget allows future growth by adding cameras without saturating the infrastructure. Alternative: if cameras require integrated 802.3af/at PoE, consider D-Link models DGS-1210-48P or DGS-1510-52XMP with PoE variants offering 370-740W budgets depending on needs.

📦 Delivery Contents

1x Tested and functional D-Link DGS-1248T switch
48x Gigabit Ethernet RJ-45 Ports 10/100/1000 Mbps
4x Combo SFP Ports (transceiver modules not included)
1x Standard EU power cable
1x Professional paper invoice with 0% VAT

ℹ️ Not Included: Fiber optic SFP/Mini-GBIC transceiver modules, Ethernet Cat5e/Cat6 patch cords, RS-232 DB-9 console cable, utility CD-ROMs, paper documentation, 19-inch rack mounting kits, and accessories are not included unless otherwise stated. Switch sold as device only with power cable included.

🚚 Shipping and Customer Service

We guarantee professional packaging suitable for network switches: double-thickness reinforced cardboard of appropriate dimensions, high-density polyurethane foam protection wrapping the device, multilayer bubble wrap securing RJ-45 ports against shocks, and padding to prevent movement during transport and handling. Each shipment includes a national carrier tracking number allowing real-time GPS tracking of the package until delivery is signed by the recipient. Our technical customer service remains available for questions about compatibility with specific network environments, basic VLANs/QoS configuration advice for quick start, recommendations for compatible fiber optic SFP modules based on connection distances, or warranty return and exchange conditions. For complex multi-site network infrastructure deployments requiring engineering, centralized management system integrations, or administrator training, we can recommend certified network integrator partners according to geographic region. Standard shipping time is 24-48 business hours after confirmed payment.

🛒 D-Link DGS-1248T Switch - 48-Port Gigabit Smart Manageable
Layer 2 Features • VLANs & QoS • 4x SFP Combo • Web Management • Tested and Functional

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🔌 D-Link Dgs-1248T 48 Ports Gigabit Manageable Smart Switch Layer 2 🌐

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