Reference Architecture Diagram + Narrative (ultra-low-latency + compliance)
┌────────────────────────────────────────────────┐
│ USERS & ROLES │
Traders │ Quants │ Risk Ops │ Payments Ops │ Branch Tellers │ Reg/Audit │
└───────────┬───────────┬───────────┬───────────┘
│ │ │
▼ ▼ ▼
┌───────────────────────────────────────────────────────┐
│ TRADING FLOORS / BRANCHES / DC EDGES (SITES) │
│ SD-Branch / SD-WAN (dual underlays) │
│ VRFs: Trading │ Payments │ Back-Office │ Guest │
│ NGFW/NAC | ZTP | QoS profiles (FIX/voice/ISO20022) │
└─────────────┬──────────────────────────────┬──────────┘
│ │
Terrestrial DIA for market data / SaaS │ LTE/5G FWA as
+ MPLS / Waves for deterministic trading │ branch/DR underlay
│ │
▼ ▼
┌─────────────────────────────────────────────┐
│ TRANSPORT / INTERCONNECTS │
│ MPLS ║ Optical Waves (10/100/400G) ║ IX │
└───────────┬─────────────────────────────────┘
│
▼
┌────────────────────────────────────────────────────────────────┐
│ SASE / SSE POPs (Zero-Trust access & egress) │
│ ZTNA │ SWG │ CASB │ FWaaS │ DLP │ Email Sec │ RBI │
│ Policy fences: region, venue, counterparty, instrument class │
└───────────┬──────────────────────────┬─────────────────────────┘
│ │
▼ ▼
┌──────────────────────────────┐ ┌──────────────────────────────────┐
│ EXCHANGE / PAYMENTS COLOs │ │ CLOUD ON-RAMPS (DX/ER/GCI) │
│ • Order Gateways (FIX) │ │ Risk/Analytics | RegTech | DR │
│ • Market Data (FAST/ITCH) │ │ Tokenization/ISO20022 services │
│ • SBC/SIP turret voice │ └───────────────┬──────────────────┘
│ • PTP/NTP time sync (grandm.)│ │
│ • HSM/KMS | PAM | SIEM/NDR │ │
└───────────┬───────────────┬──┘ │
│ │ │
▼ ▼ ▼
┌────────────────────────┐ ┌──────────────────────┐ ┌─────────────────────────┐
│ TRADING PLATFORMS │ │ PAYMENTS GATEWAYS │ │ RISK / SURVEILLANCE │
│ OMS/EMS | FIX engines │ │ ISO 20022 | SWIFT │ │ AML/Fraud | TCA | Reg │
└────────────────────────┘ └──────────────────────┘ └─────────────────────────┘
Observability / Time / Audit bus ─────────► NOC/SOC + AIOps + ITSM/CMDB + WORM/immutable logs
Narrative (how the financial fabric stays fast, exact, and lawful)
1) Purpose & posture
- Objective: Execute trades and settle payments with deterministic latency, no data loss, and provable compliance across venues and jurisdictions.
- Posture: Zero-Trust by default, least privilege, time-synchronized determinism, and immutable evidence for audit.
2) Edge & transport (syntax of connectivity)
- Site edges (trading floors, branches, private DCs) run SD-WAN/SD-Branch with dual underlays:
- MPLS/Optical waves for deterministic trading and inter-colo paths.
- DIA/IX for market-data ingress and SaaS/RegTech.
- LTE/5G FWA as rapid turn-up and last-resort failover.
- VRF segmentation separates Trading, Payments, Back-office, Guest; ZTP standardizes builds; QoS prioritizes FIX voice/turrets → FIX order flow → market data → back-office.
3) Zero-Trust egress (semantics preserved)
- SASE/SSE POPs enforce ZTNA (user+device+geo+venue), SWG/CASB/FWaaS/DLP for SaaS/API use, and RBI/Email Sec for phishing-resistant ops.
- Policy fences tie flows to instrument class / venue / jurisdiction (e.g., EU data pinned in-region).
4) Exchange & payments colos (where milliseconds matter)
- Exchange-proximate colos house order gateways (FIX), market-data handlers (FAST/ITCH), turret/SIP via SBC, and grandmaster PTP/NTP for sub-µs time alignment.
- HSM/KMS guards keys and signing; PAM gates privileged ops; SIEM/NDR watch east-west traffic.
5) Cloud on-ramps (elastic risk & compliance)
- Private Direct Connect / ExpressRoute / Interconnect to risk engines, model farms, surveillance/AML/TCA, RegTech reporting, and DR pipelines.
- Payments: ISO 20022 tokenization and gateway services accessed over pinned private links.
6) Data, identity, and evidence
- IdP/SSO/MFA with device posture; trader entitlements mapped to venues.
- WORM/immutable logging for orders, quotes, fills, voice/turret, and payments; clock stamps from PTP/NTP ensure non-repudiation and sequence truth.
7) Resilience & failover (grammar under stress)
- Circuit policy: trading FIX → secondary wave/MPLS; last resort DIA with pre-shaped QoS.
- Venue/colo failover: active/active gateways; BGP + SD-WAN app steering.
- Voice: turret/SIP reroute via alternate SBC mesh; MOS alarms drive path shifts.
- Payments: dual gateways; automatic retry with idempotent tokens.
8) Telemetry, ops, compliance (pragmatics)
- AIOps observability bus streams metrics/traces/logs + time-sync health to NOC/SOC.
- SIEM/SOAR correlates fraud / insider / anomaly; auto-actions: ZTNA revoke, VRF isolate, PAM lock.
- ITSM/CMDB anchors changes; regulatory packs (PCI DSS, SOX, GLBA, MiFID II, FINRA/SEC) generated from immutable logs.
9) Reference KPIs (trading-grade)
- Latency: ≤2 ms metro round-trip to venue; ≤80 ms intercontinental.
- Availability: ≥99.999% for exchange colos; Failover: <5 s circuit/venue switch.
- Voice MOS: ≥4.0; Clock drift: <100 µs; Fraud MTTR: <30 min.
- DR: RTO ≤1 h / RPO ≤15 min for trading & payments systems.
10) Minimal BOM (mapped to your matrix)
MPLS, Optical Waves/DCI, DIA/IX, SD-WAN/SD-Branch, LTE/5G FWA, SASE/SSE (ZTNA/SWG/CASB/FWaaS/DLP/RBI), Exchange/Payments colos, PTP/NTP grandmasters, HSM/KMS, PAM, SIEM/NDR/SOAR, SBC/SIP turrets, Cloud on-ramps, AIOps, ITSM/CMDB, WORM storage.