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Bahasa Melayu QSFP56
Đội ngũ của chúng tôi đang thực hiện bản dịch. Bài viết này tạm thời chưa có bản tiếng Việt và đang được hiển thị bằng tiếng Anh.
QSFP56 doubles QSFP28 to 200 Gb/s (4 × 50G) by moving the four lanes to PAM4 signalling — the same step SFP56 takes for a single lane. Mechanically it is a QSFP28; electrically and thermally it is a new generation.
Key facts
| Lanes × rate | 4 × 53.125 Gb/s (PAM4) |
| Total | 200G |
| Connector | MPO-12 (SR4/DR4), LC duplex (FR4/LR4), DAC/AOC |
| Supply | 3.3 V, higher power classes than QSFP28 |
| Applications | 200GBASE-SR4/DR4/FR4/LR4 (IEEE 802.3cd/bs), InfiniBand HDR, 2×100G / 4×50G breakout |
Specifications
- Mechanical: the SFF-8665 QSFP28 outline and the 28 Gb/s connector and cage family (SFF-8662/8672, SFF-8663), qualified for PAM4 signalling.
- Electrical: 200GAUI-4 (IEEE 802.3cd/802.3bs) — four PAM4 lanes.
- Management: SFF-8636 with PAM4-era code extensions, or CMIS on newer modules and hosts.
Management interface
QSFP56 sits at the boundary between the two management generations:
- Many QSFP56 modules use the paged SFF-8636 model with extended compliance codes for 50G PAM4 lanes.
- Newer modules — and all InfiniBand HDR optics on recent platforms — use CMIS, gaining the module state machine and banked pages.
A host must recognise which one a module speaks; reading a CMIS module with an SFF-8636 decoder yields nonsense past the identifier byte.
Compatibility notes
- Accepts QSFP28 and QSFP+ modules at their rates.
- Breakout to 2×100G or 4×50G (SFP56) links.
- Fits a QSFP-DD cage on four of the eight lanes.
In CodingBox
CodingBox detects whether a QSFP56 module follows SFF-8636 or CMIS and applies the matching decoder, so identity, per-lane DDM and configuration read correctly in either case.