27-EFT.WP.Packets.Light v1.0 | Chapter 15 — Use Cases & Reference Implementations

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Chapter 15 — Use Cases & Reference Implementations

One-sentence goal: Provide five reproducible, end-to-end use cases—spanning Physics → Framing → Modulation → Propagation Compensation → Switching/Queueing → Metrology → Arrival-Time Harmonization → Runtime Release—and bind them to P/S/M/I/C and manifest.packet.* so engineering teams can land and audit quickly.

I. Scope & Objects

Coverage (five use cases)
- U15-A: Metro DWDM optical-packet transport (coherent 100–400G, cascaded ROADM);
- U15-B: Intra-DC coherent optical interconnect (≥400G, short-reach / low-latency);
- U15-C: Metro FSO backup link (weather-adaptive / availability assurance);
- U15-D: Hybrid OTN/packet-optical (OCS + OPS cooperation, protection & detours);
- U15-E: Lab → Production manifest-driven release (A/B with canary rollback).
Inputs: per-use-case link & device inventories, RefCond, frame_spec, traffic and SLA.
Outputs: end-to-end manifest.packet.* set (phys / mod / label / comp / tarr / swrt / meas / queue / rt / sec), contract report, and panel snapshots.
Boundary: This chapter does not re-derive formulas; it references the respective S / M / I / C in Chapters 2–14.

II. Terms & Variables

Profile: the use-case configuration (formats, code rates, routing/protection, thresholds).
Artifacts: kernel/filter/equalizer & algorithm hashes, device & segment hashes, panel & evidence URIs.
KPIs: delta_form_*, OSNR/Q/EVM, T_arr*, lat_*, Avail, P_block/P_cont, FM_dB.
Dimensions: follow prior chapters; run check_dim( y − f(x) ) before publication.

III. Postulates P615-*

P615-1 (Dual forms end-to-end): For each use case, record the configured vs measured delta delta_form_* for every key quantity.
P615-2 (Link conservation): T_guard, power/OSNR equalization, and isolation/guard bands satisfy contracts from Chapters 3 / 5 / 6 / 10.
P615-3 (One-click manifests): End-to-end release must produce a full-path manifest.packet.* set with signature chains.
P615-4 (Fail-Closed): On any critical contract failure → rate-limit / bypass / rollback; persist actions and evidence in strategy cards.

IV. Minimal Equations S615-* (end-to-end assembly)

End-to-end delay:
lat_total = ∑_{links}( lat_prop + E[L]/C + lat_sw + lat_q + lat_proc ) (Ch. 10), go-live gate p95(lat_total) ≤ SLO.latency_p95.
Arrival-time harmonization:
T_arr* = T_form2 + ΔT_geom + ΔT_med + ΔT_inst + ΔT_proc + ΔT_sync (Ch. 8), with delta_form ≤ tol_Tarr.
End-to-end margin:
FM_dB = P_rx,med − P_min; OSNR_dB ≥ OSNR_min_dB (Chs. 11 & 4 mapping).
WDM/SDM label compliance:
GB ≥ GB_min, Iso_link ≥ Iso_min, XT_pwr ≤ XT_max (Ch. 5).
Switching/queueing: P_block / P_cont and lat_q subject to Chapters 9 / 10.

V. Metrology Pipeline M60-15 (End-to-end Ready → Implement → Validate → Sign → Release)

Ready: freeze the Profile (format/code rate/routing/protection), RefCond, and frame_spec; load device/segment inventories and threshold policies.
Implement: execute the per-chapter I60-* pipeline (physical modeling → modulation → labeling & routing → compensation → arrival-time → metrology → switching/queueing → runtime).
Validate: compute KPIs and all delta_form_*; verify contracts C60-*.
Sign: aggregate manifest.packet.*, canonicalize & sign; generate panel cards and a rollback plan.
Release / canary: start with small-traffic canary → ramp up; monitor panels & trigger strategy cards; archive audit evidence when complete.

U15-A — Metro DWDM Optical-Packet Transport (Coherent 100–400G, ROADM Cascade)

I. Scope & Objects

Profile: mod = 16/64QAM, R_c ≈ 0.9, R_net = 100–400G, DWDM 50/75 GHz grid; ROADM × N cascade, guard band GB ≈ 6.25 GHz.
Goal: Under multi-hop ROADM cascades and power/OSNR tilt, guarantee OSNR/Q/EVM and lat_total, with manifest-grade arrival time.

II. Terms & Variables

H_link(f), H_comp(f), ε_tilt (Ch. 6); ACLR/OBB, PAPR (Ch. 4); Iso_link, plan_pwr (Chs. 5 / 9).

III. Postulates P-A

Maintain Iso_link ≥ Iso_min_dB, ε_tilt ≤ tilt_max, and delta_form_mod / swrt / queue ≤ tol_*.

IV. Minimal Equations S-A

OSNR_lin@RBW_ref = P_sig / ( N0 • RBW_ref ); EVM^2 ≈ 1 / SNR_lin; BER_pred mapping per Chapter 4.

V. Metrology Pipeline M-A

Physics & compensation (Chs. 2 / 6) → H_comp;
Labeling & routing (Chs. 5 / 9) → label, path, plan_pwr;
Modulation / detection (Ch. 4) → EVM / BER;
Arrival-time harmonization (Ch. 8) → T_arr*;
Runtime & panels (Ch. 14) → delta_form_rt / lat_p95.

VI. Contracts C-A

OSNR_dB ≥ OSNR_min, EVM_p95 ≤ EVM_max, lat_total_p95 ≤ SLA, delta_form_*_p95 ≤ tol_*.

VII. Implementation Bindings I-A

* entries: build_medium_models / compensate_cd_freq / emit_label_manifest / … (see the referenced chapters).I60-Reuse

VIII. Cross-References

.2 / 4 / 5 / 6 / 8 / 9 / 10 / 11 / 14Chs.

IX. Manifests

Full manifest.packet.* set: phys / mod / label / comp / meas / tarr / swrt / queue / rt with signatures.

U15-B — Data-Center Coherent Interconnect (≥400G, Short-Reach / Low-Latency)

I. Scope & Objects

, R_s ≥ 100 GBd, reach ≤ 80 km, stringent lat_total and PAPR / mask.DP-64QAM / 1.6T DP-16QAM 800G Profile:

II. Highlights

delta_form_frame and delta_form_queue; high-frequency panel refresh.tinyMinimize dispersion & PMD residuals; ensure ample T_guard; target

III. Contracts

lat_total_p95 ≤ 5 μs/km + margin; EVM_p95 ≤ 3%; PAPR_p99 ≤ 11 dB; ACLR meets mask.

IV. Manifests

).zero-toleranceEmphasize manifest.packet.frame / queue / meas / rt with panel cards (latency/jitter/drop

U15-C — Metro FSO Backup Link (Weather-Adaptive)

I. Scope & Objects

primary/backup FSO; Avail ≥ 99.9%; weather-adaptive rate down / reroute.Profile:

II. Key Conventions

.visibility drop → slow-down / switchChapter 7 budgeting A_atm / L_point / σ_{I,eff}^2 / Avail; detect delta_form_fso; runtime strategy card:

III. Contracts

Avail ≥ Avail_min, delta_form_fso_p95 ≤ 1 dB, FM_dB ≥ FM_min, OSNR_dB ≥ OSNR_min.

IV. Manifests

manifest.packet.{ fso / meas / rt / sec }; weather & Cn2 source hashes are traceable.

U15-D — Hybrid OTN / Packet-Optical (OCS + OPS Coordination)

I. Scope & Objects

+ queueing/FDL.RSA/RSCA backbone circuits (OCS) carry bulk; OPS handles bursts; joint Profile:

II. Key Conventions

Ch. 9 P_block / P_cont / lat_sw; Ch. 10 lat_q / ρ / T_guard; Ch. 5 labeling & isolation.

III. Contracts

P_block ≤ SLA, P_cont ≤ SLA, lat_total_p95 ≤ SLA, delta_form_swrt / queue ≤ tol_*.

IV. Manifests

.insufficient isolation → reroute; congestion → rate-limit / guard expansionmanifest.packet.{ label / swrt / queue / rt }; strategy cards:

U15-E — Lab → Production Manifest-Driven Release

I. Scope & Objects

From lab link evaluation to production canary: unify manifest.packet.*, strategy cards, and rollback.

II. Steps

Run all I60-* interfaces in the lab → generate the full manifest & contract report;
Produce baseline.manifest as the reference;
Pre-production canary: compare delta_form_*, KPIs, and SLO;
Production ramp with continuous audit: panel cards, delta_form_rt, and strategy-card linkage;
Rollback: rollback_to pointer and signature-chain verification.

III. Outcome

.fully traceable, replayable, and rollback-readyRelease artifacts & evidence are

VI. Contracts & Assertions C60-15x (Unified thresholds; scenario overrides allowed)

C60-1501: all delta_form_*_p95 ≤ tol_*.
C60-1502: OSNR / EVM / BER / Q meet targets (Chs. 4 / 11).
C60-1503: Iso / GB / XT_pwr meet targets (Ch. 5).
C60-1504: lat_total_p95 / ρ / P_block / P_cont meet targets (Chs. 9 / 10).
C60-1505: T_arr* and alignment satisfy Chs. 8 / 3.
C60-1506: RefCond, units/dimensions, signatures/hashes are complete and verifiable.

VII. Implementation Bindings I60-15* (end-to-end wrappers, examples)

I60-151 build_usecase(profile) -> { graph, segments, devices, frame_spec, thresholds }
I60-152 run_pipeline(profile, inputs) -> { manifests[], panels[], kpis } (composes this volume’s I60-* + strategy cards)
I60-153 validate_end2end(manifests, kpis, rules) -> report
I60-154 publish_end2end(manifests, report) -> uri
I60-155 rollback_end2end(manifest_uri, reason) -> status
Invariants: two_forms_present = true; check_dim(*) passes; manifest signature chain intact; strategy cards & rollbacks are replayable.

VIII. Cross-References

(interfaces / contracts / manifests / metrics / uncertainty).Appendices (runtime), and Ch. 14 (metrology), Ch. 11 (FSO / arrival time / switching / queueing), Chs. 7–10 (physics / modulation / compensation / labeling), Chs. 2–6

IX. Quality & Risk Control

End-to-end SLI / SLO: delta_form_*_p95, lat_total_p95, OSNR / EVM / BER, Avail, P_block / P_cont, FM_dB, panel_freshness.
Rollback gradient: scale_down → damping / equalization back-write → lower_order / narrowband → bypass → rollback, each step persisting evidence and impact scope.
Audit: diffs vs baseline.manifest, contract failures & remediations, panel snapshots, and the manifest signature chain.

Summary

This chapter converges the volume’s conventions into operational, end-to-end use cases: every use case is anchored by dual forms + contracts + manifests to ensure reproducibility, auditability, and rollback.
With I60-15* and C60-15x, engineering teams can rapidly clone, tailor, and ship production-grade deployments.

Copyright & License (CC BY 4.0)

Copyright: Unless otherwise noted, the copyright of “Energy Filament Theory” (text, charts, illustrations, symbols, and formulas) belongs to the author “Guanglin Tu”.
License: This work is licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0). You may copy, redistribute, excerpt, adapt, and share for commercial or non‑commercial purposes with proper attribution.
Suggested attribution: Author: “Guanglin Tu”; Work: “Energy Filament Theory”; Source: energyfilament.org; License: CC BY 4.0.

First published： 2025-11-11｜Current version：v5.1
License link：https://creativecommons.org/licenses/by/4.0/