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Telecom / Network Planning · Free Tool
OTN Capacity & Right-Sizing Calculator
See how much bandwidth your optical transport network is losing to fixed-size ODU containers — and how much capacity right-sizing could free up without new equipment spend. Based on ITU-T G.709 standard container sizes and the ODUflex flexible-mapping concept.
4 sections · ~11 questions
~3 minutes
Personalized action plan
PDF summary included
Vendor-neutral · Free
Important disclaimer: This calculator produces illustrative, standards-based capacity-efficiency estimates using simplified ITU-T G.709 container assumptions. Results are indicative only and intended for early-stage capacity planning. Validate exact container mapping and engineering feasibility with your OTN vendor or systems integrator before making network design decisions.
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Phase 1 · Network Profile
A quick baseline for your transport network. This sets the scale for your capacity model.
Sites or nodes carrying traffic over this transport network.
How far ahead you're planning capacity for.
Phase 2 · Select Your Client Signal Mix
Select the client signal types carried over your transport network today. Each has a different standard OTN container profile.
Selected: 0 signal types · Select at least 1 to continue
Phase 3 · Container Assignment Today
How is each signal type mapped today?
For each signal type, set the approximate number of instances and how it's currently mapped into your OTN. This drives your current-state efficiency baseline.
Phase 4 · Assumption Calibration
Adjust the growth and headroom assumptions used to check whether right-sizing alone covers your near-term growth.
ITU-T G.709 Reference
ODUflex maps client signals in 1.25G increments via GMP/BMP/AMP, instead of dedicating a full fixed-size ODU (2.5G / 10G / 40G / 100G) per signal. Defaults below are typical planning assumptions — adjust to match your environment.
Applied to your current total actual signal throughput (not container capacity).
10%150%
30%
Extra margin on top of projected growth, for burst traffic and unplanned demand.
0%50%
15%
Your capacity efficiency report is ready.
Enter your details below to access your full report — current vs. right-sized efficiency, per-signal breakdown, and growth headroom check.
↓ Complete the form below to view your results
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OTN Capacity & Right-Sizing Calculator
Per-Signal Breakdown
Your Inputs & Assumptions
Methodology & Sources
1ITU-T G.709 (OTN) — standard OTU/ODU container hierarchy (ODU0/1/2/2e/3/4) and payload rates, up to edition 4.
2ODUflex concept — flexible container sizing in 1.25G increments via Generic Mapping Procedure (GMP), Bit-synchronous Mapping Procedure (BMP), or Asynchronous Mapping Procedure (AMP), as opposed to dedicating a full fixed-size ODU per client signal.
3Simplified planning model: "legacy fixed" container = the smallest standard ODU order that fits the client signal's line rate under conventional fixed mapping. "Right-sized" container = the smallest 1.25G-increment container that fits the signal, capped at the legacy container size (right-sizing never requires more capacity than fixed mapping). Signals with a purpose-built standard container already show minimal or no gain.
4TeckNexus Intelligence & Industry Reports, 2026 — tool design, defaults, and framing.
Important Disclaimer
This report produces illustrative capacity-efficiency estimates based on simplified, standards-based container assumptions and your self-reported inputs. It is provided for indicative early-stage planning purposes only.
This calculator does not constitute network engineering, procurement, or investment advice. Actual achievable efficiency depends on your specific OTN platform's supported mapping procedures, existing equipment generation, mixed-rate multiplexing constraints, protection/restoration overhead, and vendor-specific implementation. Container sizes shown are simplified planning references, not exact engineering specifications.
TeckNexus has not verified site-specific conditions. Users are advised to commission vendor-specific capacity planning and engineering validation before making network design or procurement decisions.
Ready to go deeper?
Talk to an optical transport specialist about right-sizing your network and validating this estimate against your specific platform.
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