💡 Lit Fiber

Managed Optical Ethernet with SLAs (Fast, Simple, Auditable)

Lit Fiber delivers carrier-managed optical Ethernet between your sites and clouds with contracted SLAs—no optics to manage, no DWDM to tune.
You choose the handoff (EPL/EVPL/E-LAN/DIA), speed (100 Mb/s → 1/10/100/400 Gb/s where available), and endpoints; the provider lights and monitors the path. SolveForce designs Lit Fiber so it’s resilient, secure, and evidence-ready for audits.

Related options: 🌑 Dark Fiber (you light it) → Dark Fiber • 🔀 Wavelength (per-wave L1) → Wavelength Services
See the catalog: 🌐 Connectivity • 🖧 Networks & Data Centers

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🎯 Outcomes (Why Lit Fiber)

• Simplicity— provider lights and manages optics; you get Ethernet handoffs and SLAs.
• Speed & scale— 100M/1G/10G common; 100/400G where plant supports it.
• Predictable performance— latency/jitter/loss SLAs, plus Mean Time To Restore (MTTR).
• Easy redundancy— dual diverse circuits, diverse POPs, or protected rings.
• Audit-ready— turn-up baselines, SLA reports, and change evidence exported to SIEM.

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🧭 Service Profiles (Spelled Out)

• EPL (Ethernet Private Line)— point-to-point Layer-2; transparent Ethernet as if local.
• EVPL (Ethernet Virtual Private Line)— point-to-multipoint L2 (multiple EVCs on one UNI).
• E-LAN (VPLS/EVPN-based)— any-to-any L2 “virtual LAN” across sites. → VPLS
• E-Access / E-Tree— hub-and-spoke L2 for wholesale/aggregation patterns.
• DIA (Dedicated Internet Access) over Lit Fiber— managed Internet with symmetric bandwidth. → Fiber Internet

Need deterministic L1 without managing optics? Choose Wavelength Services.
Need full optical control (your own DWDM)? Choose Dark Fiber.

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🧱 Technical Building Blocks

• UNI/NNI handoffs— electrical or optical (SMF LC/MPO); 1/10/100/400 GbE.
• EVCs & QoS— Ethernet Virtual Circuits with CoS for voice/video/critical apps.
• Protection & diversity— protected rings (sub-50 ms) or dual unprotected paths with physical diversity.
• Monitoring— provider NMS + customer visibility; performance probes and fault management. → Circuit Monitoring • NOC Services

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🧰 Design Patterns (Pick Your Fit)

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🔒 Security & Boundary Controls

• Edge policy — next-gen FW/WAF at borders; L2 ACLs/SGT where supported. → Cybersecurity • WAF / Bot Management
• Encryption — add MACsec (L2) or IPsec (L3) if policy requires encryption over managed fiber. → Encryption
• Identity & ZTNA — app-level access for users/contractors; no flat VPN. → ZTNA
• Evidence — perf & fault logs stream to SIEM; SOAR playbooks for escalate/rollback. → SIEM / SOAR

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📐 SLO Guardrails (Typical Lit Fiber Targets)

Metric	Metro (Class A)	Regional (Class B)	Notes
One-way latency	≤ 1–3 ms	≤ 8–20 ms	Route-dependent
Jitter	≤ 1 ms	≤ 3 ms	QoS classes honored
Packet loss (sustained)	< 0.1%	< 0.1%	SLA backed
Availability	99.95–99.99%	99.9–99.95%	With protection/diversity
MTTR	≤ 4 hours	≤ 4–8 hours	Contracted

We publish SLO dashboards and open carrier tickets on breach. → Circuit Monitoring • NOC Services

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💵 Commercials (No Surprises)

• Port/accessspeed (100M/1G/10G/100G/400G) and EVC count drive price.
• Distance/route— metro vs regional; protected vs unprotected; diversity options.
• Term— 12/24/36+ months; NRC for install, MRC for service; cross-connect fees in colos. → Colocation
• Burst/QoS— contracted rates; excess handled per class and policy.

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🧪 Turn-Up & Acceptance (What We Test)

1) Provisioning — UNI/EVC build; QoS classes; VLAN tags.
2) Baseline — RFC 2544 / ITU-T Y.1564 throughput/latency/jitter/loss by class.
3) Diversity — validate path/POP diversity (route letters/maps where requested).
4) Monitoring — add to NOC; perf thresholds; escalation trees. → NOC Services

Artifacts (test reports, routes, SLAs) are stored and exported to SIEM for audits. → SIEM / SOAR

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🧭 Lit vs Wavelength vs Dark (Quick Guide)

Need / Constraint	Choose
Simple L2/L3 handoff with SLAs; no optics to run	Lit Fiber
Deterministic L1 per-wave, provider-lit	Wavelength
Full optical control (DWDM under your ops)	Dark Fiber

Many customers mix: Lit for branches, Wavelength for regional trunks, Dark for high-capacity DCI/AI fabrics.

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🛠️ Implementation Blueprint (No-Surprise Rollout)

1) Inventory endpoints — sites/DCs/colos/cloud on-ramp POPs.
2) Select service — EPL/EVPL/E-LAN/DIA and QoS classes.
3) Redundancy plan — protected vs unprotected; dual diverse laterals/POPs; letters for diversity.
4) Handoffs — optics (LR/LR4/ER4) vs electrical; VLAN/EVC plan; MTU/QoS settings.
5) Security & policy — FW/WAF, MACsec/IPsec where required; ZTNA for users.
6) Turn-up tests — RFC 2544/Y.1564; store baselines; attach to change ticket.
7) Operate — onboard to NOC; perf alarms; monthly SLA reviews; carrier escalation playbooks.
→ Direct Connect • SD-WAN • Cybersecurity

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✅ Pre-Engagement Checklist

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🔄 Where Lit Fiber Fits (Recursive View)

1) Grammar — a managed transport in Connectivity.
2) Syntax — underlays for Cloud, DCI, and on-ramps.
3) Semantics — integrity & boundary protection via Cybersecurity.
4) Pragmatics — telemetry drives SolveForce AI and SD-WAN steering.
5) Foundation — consistent terms via Primacy of Language.
6) Map — indexed in the SolveForce Codex & Knowledge Hub.

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📞 Order Lit Fiber / Design a Resilient Underlay

Related pages:
Wavelength Services • Dark Fiber • Direct Connect • Colocation • SD-WAN • MPLS • VPLS • VPN Services • Circuit Monitoring • NOC Services • Connectivity • Networks & Data Centers • Cloud • Cybersecurity • Knowledge Hub

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Key terms in plain language

Open a term for a concise explanation of language used on this page.

💡Fiber Internet

Internet delivered through strands of glass using light. Fiber commonly supports high capacity, low latency, and strong upload performance, but availability must be confirmed for the exact address.

📊Bandwidth

The amount of data a connection can carry in a given time, usually measured in Mbps or Gbps. More bandwidth supports more users, devices, and simultaneous applications.

⏱️Latency

The time it takes data to travel between two points. Lower latency improves voice, video meetings, cloud applications, gaming, and other real-time services.

📋Service-Level Agreement (SLA)

A provider’s written commitment covering service targets such as availability, response time, repair time, and sometimes financial credits when commitments are missed.

🛣️Dedicated Internet Access (DIA)

A business-grade Internet connection with capacity dedicated to the customer rather than shared in the same way as typical consumer broadband. It often includes symmetrical speeds and an SLA.

🔀SD-WAN

Software-defined wide area networking. It manages multiple connections and chooses paths based on application needs, performance, and policy to improve resilience and control.

🕸️MPLS

Multiprotocol Label Switching, a private-network technology that directs traffic along managed paths. Organizations use it for predictable connectivity between locations.

🔐VPN

A virtual private network creates an encrypted connection across another network, commonly allowing remote users or offices to access private resources securely.