# Rack test

Part ID: 4.02a · Layer 4 (Servers, racks & integration) · child of 4.02

Dedicated test cells and instrumentation that exercise a fully assembled rack under load before it ships, distinct from chip- or board-level test earlier in the chain.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Chroma | manufacturer | inferred | public | 2360.TW |  |
| Keysight | manufacturer | inferred | public | KEYS |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.