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Dark Fiber in the Netherlands: How SMEs Can Light Their Own Connection

Networkser Group B.V., Evgin Aldemir

Dark Fiber in the Netherlands: How SMEs Can Light Their Own Connection

Somewhere under the street outside your office there may be fiber-optic cable that nobody is using. It's called dark fiber: glass that is already in the ground but carries no light until someone conne...

1 nov 2026

"Unsupported Transceiver" on Your Cisco Switch? What It Means and What to Do

Networkser Group B.V., Evgin Aldemir

"Unsupported Transceiver" on Your Cisco Switch? What It Means and What to Do

You plug a new SFP into a Cisco switch and the log fills up: unsupported transceiver, and the port goes err-disabled. It looks like the module is broken. In most cases it isn't. The message is about w...

1 nov 2026

Single-Mode or Multimode? Choosing Fiber for Your Next Cable Pull

Networkser Group B.V., Evgin Aldemir

Single-Mode or Multimode? Choosing Fiber for Your Next Cable Pull

If you're planning new cabling this year, you'll face the question every installer asks: multimode or single-mode? For years multimode was the easy answer inside buildings. Higher speeds are changing ...

1 nov 2026

Cisco End of Support: ASA 5500-X, Catalyst 2960-X and ISR 4300 Explained

Networkser Group B.V., Evgin Aldemir

Cisco End of Support: ASA 5500-X, Catalyst 2960-X and ISR 4300 Explained

Cisco hardware doesn't stop working on its last date of support. What stops are the software fixes, the security updates and help from Cisco TAC. For a firewall at the edge of your network, that's a r...

1 nov 2026

Amsterdam's Data Center Moratorium Is Pushing Capacity to the Edge: Here's What That Means for Your Network

Networkser Group B.V., Evgin Aldemir

Amsterdam's Data Center Moratorium Is Pushing Capacity to the Edge: Here's What That Means for Your Network

On 12 July 2019, the municipalities of Amsterdam and Haarlemmermeer announced a moratorium halting new data center construction within their borders, pending new policy. The 2020 policy that followed ...

2 sept 2026

SFP Programming 101: Complete Guide for Network Technicians

Networkser Group B.V., Evgin Aldemir

SFP Programming 101: Complete Guide for Network Technicians

SFP Programming 101: A Complete Guide to Fiber Optic Module Configuration Introduction: Why Your Network Depends on Proper SFP Configuration You're in the middle of upgrading your network infrastructu...

11 jun 2026

Recoded SFP Transceivers Explained: Innova Compatible vs OEM

Networkser Group B.V., Evgin Aldemir

Recoded SFP Transceivers Explained: Innova Compatible vs OEM

You insert a new SFP+ module. The switch logs a warning: "Transceiver module in GigabitEthernet0/1 is not a Cisco approved module." Or on some firmware versions, the interface does not come up at all....

11 jun 2026

Cisco vs Juniper Switches: A 2026 Buyer's Guide

Networkser Group B.V., Evgin Aldemir

Cisco vs Juniper Switches: A 2026 Buyer's Guide

If you are evaluating Cisco and Juniper switches for a new deployment or refresh, you probably know both are enterprise-grade. The real question is: which one fits your environment, your team, and you...

11 jun 2026

How to Choose the Right SFP Transceiver for Your Network

Networkser Group B.V., Evgin Aldemir

How to Choose the Right SFP Transceiver for Your Network

You have ordered the switch. The fibres are run. You are about to place the transceiver order and you realise: there are about forty variants of "SFP-10G" and the descriptions all look similar. Choosi...

11 jun 2026

Refurbished vs New Networking Equipment: The Real TCO

Networkser Group B.V., Evgin Aldemir

Refurbished vs New Networking Equipment: The Real TCO

The conversation usually starts the same way: "We need to refresh the core switches." A quote lands on the table: twelve new Cisco Catalyst units, full SmartNet, new licences. The number is substantia...

11 jun 2026

Why Refurbished Cisco Switches Are the Smart Choice for Enterprise Networks

Networkser Group B.V., Evgin Aldemir

Why Refurbished Cisco Switches Are the Smart Choice for Enterprise Networks

When your network refresh budget gets slashed but the performance targets stay exactly the same, something has to give. Most network engineers reach for new hardware by reflex: but the smarter move is...

IT Hardware Networking Refurbished Hardware

1 jun 2026

How to Buy Refurbished Cisco Switches: Complete Guide for Businesses

Networkser Group B.V., Evgin Aldemir

How to Buy Refurbished Cisco Switches: Complete Guide for Businesses

Introduction: Smart Purchasing for Enterprise Networks When building or expanding a network infrastructure, the cost of new equipment can strain budgets. Refurbished Cisco switches offer a compelling ...

7 may 2026

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