# A5 — Network Architecture

**Project:** Kingsford Hotel Bacolod — BMS
**Date:** 2026-04-28
**Source:** A-006 (isolated BMS LAN); A4 panel schedule (13 panels); EE-24 power riser (Part 1) for shaft routing.

## Topology

Two-tier BACnet topology per Megaworld MC Standards:

- **Supervisory layer (BACnet/IP)** — head-end server, operator/HMI workstations, primary BACnet/IP between core/edge switches. Cat6 + fiber where shaft length exceeds 90 m (none in this project; building is compact).
- **Field layer (BACnet MS/TP)** — daisy-chained shielded twisted-pair backbone visiting all 13 BMS field panels. Total backbone ~320 m measured per A3 trunk_topology.

```mermaid
flowchart TD
  HE["Head-End (Server, WS, HMI, UPS)"] --> CSW[Core Switch L2/L3]
  CSW --> ESW1[Edge Switch — LG/2F]
  CSW --> ESW2[Edge Switch — GF/3F]
  CSW --> ESW3[Edge Switch — Roofdeck]
  CSW --> CWLAN[Customer LAN uplink]

  ESW1 --> P_CHW[BMS-PNL-CHWPLANT-2F]
  ESW1 --> P_BOH[BMS-PNL-BOHAHU-2F]
  ESW1 --> P_AHU2F[BMS-PNL-AHU-2F]
  ESW1 --> P_CASINO[BMS-PNL-CASINO-2F]
  ESW1 --> P_BOIL[BMS-PNL-BOILER-LG]
  ESW1 --> P_PLLG[BMS-PNL-PLUMBING-LG]

  ESW2 --> P_VENTGF[BMS-PNL-VENT-GF]
  ESW2 --> P_VENT2[BMS-PNL-VENT-2F]
  ESW2 --> P_VENT3[BMS-PNL-VENT-3F]

  ESW3 --> P_AHURD[BMS-PNL-AHU-RD]
  ESW3 --> P_CTRD[BMS-PNL-CT-RD]
  ESW3 --> P_PLRD[BMS-PNL-PLUMBING-RD]
  ESW3 --> P_VENTRD[BMS-PNL-VENT-RD]

  P_CHW -. "MS/TP backbone (320 m)" .- P_BOH
  P_BOH -.- P_AHU2F
  P_AHU2F -.- P_CASINO
  P_CASINO -.- P_BOIL
  P_BOIL -.- P_PLLG
  P_PLLG -.- P_VENTGF
  P_VENTGF -.- P_VENT2
  P_VENT2 -.- P_VENT3
  P_VENT3 -.- P_VENTRD
  P_VENTRD -.- P_AHURD
  P_AHURD -.- P_CTRD
  P_CTRD -.- P_PLRD
```

## Switch inventory

| Switch | Role | Ports | Location | Notes |
|--------|------|-------|----------|-------|
| CSW-01 | Core L2/L3 managed switch | 24-port GbE + 2× 10G uplink | Head-end rack (server room) | VLAN segmentation, customer-LAN uplink, BACnet/IP routing |
| ESW-01 | Edge L2 switch — LG / 2F | 16-port GbE | 2F mechanical zone | Aggregates 6 BMS panels: CHW Plant, BOH AHU, AHU 2F, Casino, Boiler LG, Plumbing LG |
| ESW-02 | Edge L2 switch — GF / 3F | 16-port GbE | GF service core (or wherever IT room landed) | Aggregates 3 BMS panels (Vent GF, Vent 2F, Vent 3F) |
| ESW-03 | Edge L2 switch — Roofdeck | 16-port GbE | Roofdeck plant area | Aggregates 4 BMS panels (AHU RD, CT RD, Plumbing RD, Vent RD) |

## VLAN strategy

- **VLAN 10** — BMS supervisory (head-end + workstations)
- **VLAN 20** — BMS field (panels + IP-attached HLI)
- **VLAN 30** — BMS guest / engineering laptop
- **Customer LAN uplink** — single managed connection, traffic-rate-limited; per Q-007.

## Coordination

- **Q-007** — server-room placement + customer-LAN uplink terms still to confirm with customer IT.
- **Q-008** — switch brand (Cisco / Aruba / equivalent customer-approved) pending.

## Disclosure (customer-facing)

The BMS network is physically isolated from the customer LAN with a single managed uplink; this protects the hotel's primary IT environment from BMS traffic. The MS/TP field backbone is sized at 320 m measured per panel layout per EE-24 riser + ECE-12/16 floor backgrounds. If customer IT requires a different topology, switch and uplink quantities can be re-tuned without affecting BMS scope.