Business Connectivity Solutions | Internet & Network Services UK
CSLN Group provides reliable, high-performance business connectivity solutions to organisations across the UK. In partnership with Spitfire Network Services, we deliver dedicated internet circuits, fibre broadband, Ethernet, mobile data, and wide-area networking — all backed by proactive monitoring and expert support from our team.
Whether you need a single office connected with ultrafast fibre or a resilient multi-site network spanning the UK, we design, provision, and manage connectivity solutions that keep your business online, productive, and secure.
Why Choose CSLN Group for Business Connectivity?
Most ISPs sell you a line and leave you to it. CSLN Group is different. As a managed IT support provider and Spitfire Network Services partner, we take full ownership of your connectivity — from initial design through to ongoing monitoring and support. If something goes wrong, you call us, not a faceless call centre.
- Spitfire Network Services Partner — access to one of the UK's most respected independent network providers
- Single Provider — connectivity, IT support, cybersecurity, VoIP, and telecoms from one team
- Proactive Monitoring — we detect and resolve issues before they impact your business
- UK-Wide Coverage — remote and on-site support from our offices in Kings Lynn, Cambridge, and Norwich
- Extended Hours — support available 6am–10pm, seven days a week
Our Business Connectivity Services
Dedicated Ethernet
Ethernet connectivity delivers symmetrical, uncontended bandwidth over a dedicated circuit — meaning your speed is guaranteed and not shared with other users. This is the gold standard for businesses that rely on cloud applications, VoIP, video conferencing, or large data transfers.
- Symmetrical speeds from 10Mbps to 10Gbps
- Guaranteed bandwidth with service level agreements (SLAs)
- Low latency and jitter — ideal for VoIP and real-time applications
- Available over fibre, EFM, or GEA depending on location
- 24/7 circuit monitoring by Spitfire's network operations centre
Fibre to the Premises (FTTP)
FTTP delivers ultrafast broadband directly to your premises over a full fibre connection. With speeds up to 1Gbps and no copper in the path, FTTP offers exceptional performance at a competitive price point — ideal for businesses that need fast, reliable internet without the cost of dedicated Ethernet.
- Download speeds up to 1Gbps
- Full fibre connection — no copper, no contention
- Low latency and high reliability
- Cost-effective alternative to leased lines for many businesses
- Available at an increasing number of UK premises
Fibre to the Cabinet (FTTC)
FTTC broadband delivers speeds up to 80Mbps download and 20Mbps upload, using fibre to the street cabinet and copper for the final connection to your premises. It's widely available across the UK and provides a solid, affordable connectivity option for smaller offices and remote workers.
- Download speeds up to 80Mbps
- Widely available across the UK
- Quick installation with minimal disruption
- Suitable for email, web browsing, and light cloud usage
- Can be paired with a backup circuit for resilience
Business Broadband
For businesses that need a reliable internet connection without the cost of a dedicated circuit, our business broadband packages deliver consistent performance with business-grade support. Unlike consumer broadband, our packages include static IP addresses, faster fault resolution, and proactive monitoring.
- Static IP addresses included
- Business-grade SLAs and fault resolution
- Proactive monitoring by CSLN Group
- Suitable for small offices and branch locations
- Available over FTTP, FTTC, or ADSL depending on location
Mobile Data & 4G/5G Backup
Keep your business connected even when your primary circuit fails. Our mobile data solutions provide automatic failover to 4G or 5G, ensuring continuity for critical operations. Mobile data is also ideal as a primary connection for temporary sites, events, or locations where fixed-line broadband isn't available.
- Automatic failover from fixed-line to mobile data
- 4G and 5G options available
- Ideal for business continuity and disaster recovery
- Temporary and portable connectivity for events and construction sites
- Managed and monitored by CSLN Group
MPLS & SD-WAN
For multi-site organisations that need secure, reliable connectivity between locations, we design and manage MPLS and SD-WAN networks. These technologies connect your offices, warehouses, and remote workers into a single, high-performance private network — with centralised management and traffic prioritisation.
- Secure site-to-site connectivity over private or public networks
- Traffic prioritisation for voice, video, and critical applications
- Centralised management and visibility across all sites
- SD-WAN provides cost-effective multi-site networking using broadband and Ethernet
- Automatic failover between circuits for maximum uptime
Leased Lines
A leased line is a dedicated, point-to-point connection between your premises and the network. It delivers guaranteed symmetrical bandwidth with the highest levels of reliability and performance — ideal for data-intensive businesses, hosting environments, and organisations that cannot tolerate downtime.
- Guaranteed symmetrical speeds from 10Mbps to 10Gbps
- Uncontended — your bandwidth is yours alone
- Industry-leading SLAs with rapid fault resolution
- Ideal for VoIP, cloud platforms, and mission-critical applications
- Available nationwide through Spitfire Network Services
Connectivity Solutions by Business Size
Small Businesses & Startups
Reliable, affordable connectivity that grows with you. Start with FTTP or FTTC broadband, add a 4G backup for resilience, and upgrade to Ethernet as your needs increase. We design solutions that fit your budget today and scale for tomorrow.
Mid-Sized Businesses
Dedicated Ethernet circuits with guaranteed bandwidth, VoIP-ready QoS, and proactive monitoring. Connect multiple offices with SD-WAN and keep remote workers productive with secure VPN access — all managed by CSLN Group.
Enterprise & Multi-Site
Complex, high-availability network architectures with MPLS, SD-WAN, diverse routing, and automatic failover. We design resilient networks that keep your entire organisation connected, with 24/7 monitoring and dedicated account management.
Connectivity for Key Sectors
Education
High-bandwidth, filtered internet connections for schools, colleges, and multi-academy trusts. We deliver connectivity that supports digital learning, cloud platforms, and safeguarding-compliant web filtering. All our engineers are DBS-checked for safe working in education environments.
Professional Services
Low-latency, reliable connections for law firms, accountancy practices, and consultancies. Guaranteed bandwidth ensures cloud accounting software, case management systems, and VoIP calls perform flawlessly — even during peak hours.
Construction
Temporary and permanent connectivity for offices and construction sites. 4G/5G mobile data keeps site teams connected, while dedicated Ethernet serves head offices and design studios with reliable, high-speed access.
Manufacturing & Warehousing
Resilient connectivity for production environments, warehouse management systems, and IoT devices. We design networks that keep your operations running 24/7, with automatic failover and proactive monitoring to prevent costly downtime.
Healthcare
Secure, GDPR-compliant connectivity for GP surgeries, dental practices, and care providers. Reliable internet access for clinical systems, patient records, and telehealth — with the performance and uptime your patients depend on.
Why Spitfire Network Services?
We partner with Spitfire Network Services because they share our commitment to quality, reliability, and customer service. Spitfire is one of the UK's leading independent network providers, trusted by thousands of businesses for mission-critical connectivity.
- ✔ UK-based network operations centre with 24/7 monitoring
- ✔ Access to all major UK carriers and exchanges
- ✔ Dedicated account management and technical support
- ✔ Proactive fault detection and rapid resolution
- ✔ Flexible contracts and competitive pricing
- ✔ Full portfolio: Ethernet, FTTP, FTTC, EFM, mobile data, MPLS, and more
What's Included with Every Connectivity Solution
- ✔ Free site survey and connectivity assessment
- ✔ Solution design tailored to your business requirements
- ✔ Professional installation and router configuration
- ✔ Proactive circuit monitoring and alerting
- ✔ Ongoing support 6am–10pm, seven days a week
- ✔ Single point of contact for connectivity and IT support
- ✔ Dedicated account manager
Frequently Asked Questions
What's the difference between broadband and a leased line?
Broadband is a shared connection — your speed can vary depending on how many people in your area are online. A leased line is a dedicated, uncontended circuit with guaranteed symmetrical speeds and an SLA for uptime and fault resolution. Leased lines cost more but deliver consistent, reliable performance for businesses that depend on their internet connection.
Do I need a dedicated circuit for VoIP?
Not always, but it helps. VoIP call quality depends on low latency, low jitter, and sufficient bandwidth. A dedicated Ethernet circuit with Quality of Service (QoS) settings ensures voice traffic is prioritised. If you're using broadband, we can still configure QoS to improve call quality, and a 4G backup provides failover if your primary line drops.
How long does installation take?
It depends on the circuit type. FTTC and FTTP broadband can typically be installed within 5–10 working days. Dedicated Ethernet circuits take longer — usually 30–60 working days depending on whether new fibre needs to be laid. We manage the entire process and keep you informed at every stage.
Can you connect multiple office sites?
Yes. We design and manage multi-site networks using MPLS, SD-WAN, or site-to-site VPN. These technologies connect your offices, warehouses, and remote workers into a single secure network with centralised management and traffic prioritisation.
What happens if my internet goes down?
We configure automatic failover so your traffic switches to a backup circuit — typically 4G/5G mobile data or a secondary broadband line — within seconds. With proactive monitoring, we often detect and resolve issues before you even notice them.
Can I keep my existing phone numbers if I switch provider?
Yes. If you're moving your VoIP or phone system to our connectivity, we handle number porting from your current provider with zero downtime. See our Business VoIP Phone Systems page for more details.
What areas do you cover?
We provide business connectivity solutions across the entire UK. Through our partnership with Spitfire Network Services, we have access to all major UK carriers and exchanges, so we can deliver circuits to virtually any business premises in the country.
How do I know which connectivity solution is right for my business?
Book a free connectivity assessment with our team. We'll review your current setup, understand your requirements (bandwidth, reliability, budget, number of users), and recommend the best solution. There's no obligation and no jargon.
Do you offer backup and disaster recovery connectivity?
Yes. We strongly recommend every business has a backup connection. Options include 4G/5G mobile data failover, a secondary broadband line, or diverse-routed Ethernet circuits for maximum resilience. We design backup solutions proportionate to your risk and budget.
Can you manage connectivity I already have with another provider?
In most cases, yes. We can monitor and manage existing circuits as part of your managed IT support agreement. However, we typically recommend migrating to Spitfire Network Services for the best performance, support, and value — and we handle the entire migration process.
Book a Free Connectivity Assessment
Not sure what your business needs? Book a free connectivity assessment with our specialists. We'll evaluate your current setup, check what's available at your premises, and recommend the right solution — with no obligation and no jargon.
Ready to Upgrade Your Business Connectivity?
Speak to our connectivity specialists today. Call us on 0330 363 9976, email hello@cslngroup.com, or use the contact form below to request a free, no-obligation quote.
Contact CSLN — Your Business Connectivity Partner
Ready to upgrade your business internet or need expert advice on connectivity solutions? Let's talk.
📞 Call: 0330 363 9976
📧 Email: hello@cslngroup.com
🏢 Offices: Kings Lynn, Cambridge, Norwich
Or send us a message via our contact form, and we'll respond promptly to your enquiry.
Helpful Internal Links
Client Reviews: Trusted IT Support for Businesses & Schools
Over the past three years, CSLN Group has been a key strategic partner in shaping and delivering our IT strategy. Their guidance and technical expertise have supported major projects including cloud transitions, infrastructure upgrades, and improved cybersecurity.
Their collaborative approach and deep understanding of our needs have enabled us to build a more resilient and future-ready IT environment. CSLN’s support has allowed our internal team to focus on service development with confidence in the stability and performance of our core systems.
We highly value our partnership with CSLN Group and would recommend them without hesitation.
Contact CSLN — Your Business Connectivity Partner
Ready to upgrade your business internet or need expert advice on connectivity solutions? Let's talk.
📞 Call: 0330 363 9976
📧 Email: hello@cslngroup.com
🏢 Offices: Kings Lynn, Cambridge, Norwich
Or send us a message via our contact form, and we'll respond promptly to your enquiry.