آپٹیکل انٹرفیسز کے MSA: CWDM4، PSM4، 100G Lambda، ZR/ZR+

ہماری ٹیم ترجمے پر کام کر رہی ہے۔ یہ مضمون عارضی طور پر اردو میں دستیاب نہیں ہے، اس لیے اسے انگریزی میں دکھایا جا رہا ہے۔

Three kinds of document define a pluggable module. Form-factor MSAs (SFP, QSFP-DD, OSFP) fix the mechanics and electrical pins; management specifications (SFF-8472, SFF-8636, CMIS) fix the memory map; and the optical interface — wavelengths, powers, reach, coding — comes either from a formal standard (IEEE 802.3 for Ethernet, T11 for Fibre Channel, IBTA for InfiniBand, ITU-T for transport) or from an interface MSA: a group of vendors agreeing on a PMD the standards bodies had not (yet) written. Many of the most common data-centre optics are MSA interfaces, and their names are on the label, in SFF-8024 codes and in CMIS applications.

Why interface MSAs exist

IEEE standardises a small set of reaches per rate (for 100G: SR4, LR4, ER4 and later DR, FR1, LR1). Operators wanted cheaper 2 km and 500 m options, duplex multimode, bidirectional fibre, and coherent DWDM in a pluggable — so vendors wrote MSAs in months rather than the years an IEEE project takes. Several were later adopted or superseded by IEEE clauses, but the MSA names stuck.

The catalogue

MSA / group	Founded	Defines	Medium & reach	Codes
10x10 MSA	2011	100G as 10 × 10G wavelengths (CFP)	SMF 2 / 10 / 40 km	legacy
100G PSM4	2014	4 × 25G parallel single-mode, 1310 nm, MPO	SMF 500 m	Table 4-4 07h
100G CWDM4	2014	4 × 25G on 1271–1331 nm CWDM, duplex LC	SMF 2 km	06h
CLR4 Alliance	2014	CWDM4 variant intended to run without FEC	SMF 2 km	17h
SWDM Alliance	2015	40G/100G SWDM4: 4 wavelengths 850–940 nm on duplex MMF	OM4/OM5 100–150 m	1Fh / 20h
4WDM MSA	2017	100G 4WDM-10 / -20 / -40 on LAN-WDM wavelengths	SMF 10 / 20 / 40 km	22h–24h
100G Lambda MSA	2017	100G per wavelength PAM4: 100G-FR, 100G-LR, 400G-FR4, 400G-LR4-10, later 100G-ER1-30/40	SMF 2 / 10 / 30–40 km	26h, 27h, 48h, 49h
400G BiDi MSA	2018	400G-BD4.2 — 8 × 50G on 4 duplex MMF pairs, two wavelengths per fibre	MMF 70–150 m	became IEEE 400GBASE-SR4.2
OIF 400ZR	IA 2020	400G coherent DWDM (16QAM, CFEC) in QSFP-DD/OSFP, amplified metro	SMF 80–120 km amplified	4Ah (400GBASE-ZR in IEEE)
OpenZR+ MSA	2020	extends 400ZR: oFEC, 100–400G multi-rate, longer reach, QPSK/8QAM/16QAM	SMF regional	CMIS applications
OpenROADM MSA	2016	operator-driven coherent 100–400G plus open line-system YANG models	SMF long haul	CMIS applications
800G Pluggable MSA	2019	800G-FR4 (4 × 200G, 2 km) and 800G-PSM8 / DR8 (8 × 100G, 500 m)	SMF	800G media IDs
OpenEye MSA	2019	analog (DSP-free) PAM4 optics for 50G–400G to cut power and latency	SMF / MMF	vendor-specific
COBO	2015	on-board optics form factor and management (uses CMIS)	—	identifiers 02h-class
CFP MSA	2009	CFP / CFP2 / CFP4 / CFP8 form factors for 40G–400G, incl. coherent CFP2-DCO/ACO	—	form factor
25G / 50G Ethernet Consortia	2014 / 2016	single-lane 25G and 50G Ethernet ahead of IEEE 802.3by / 802.3cd	—	adopted by IEEE
QSFP-DD, OSFP, SFP-DD, DSFP MSAs	2016–2018	form factors and (with OIF) CMIS/MIS management	—	Form factors

Years are the founding or first-release year of each group; exact dates and revisions are on the MSA sites.

MSA vs IEEE: interoperability traps

Pairing	Interoperable?	Why
100G CWDM4 ↔ 100G CLR4	usually	same wavelengths; CLR4 specifies FEC-free operation — host FEC settings must match
100G CWDM4 ↔ 4WDM-10	no	4WDM uses LAN-WDM wavelengths (1295–1310 nm), not CWDM
100G PSM4 ↔ 100GBASE-DR4 / 400G DR4 breakout	no	PSM4 is 4 × 25G NRZ; DR is 100G PAM4 per fibre
100G-FR / 100G-LR (Lambda MSA) ↔ 100GBASE-FR1 / LR1 (IEEE)	yes	IEEE adopted the MSA parameters
400G-FR4 (MSA) ↔ 400GBASE-FR4 (IEEE)	yes	same
400ZR ↔ OpenZR+	only in 400ZR mode	ZR+ modules usually support the 400ZR application too
40G SWDM4 ↔ 40GBASE-SR4	no	duplex MMF with 4 wavelengths vs parallel MPO

Always read the module's compliance code rather than the marketing name: Compliance codes, Physical mismatches.

Where these optics appear

Data-centre leaf/spine — PSM4 and CWDM4 dominated 100G; 400G-FR4/DR4 and 800G-DR8 follow the same pattern (Ethernet optical interfaces).
Campus and enterprise MMF — SWDM4 and BiDi to reuse duplex OM3/OM4 for 40G/100G.
Metro and DCI — 400ZR/ZR+ replace transponders with pluggables (Coherent & long haul).
AI clusters — 800G DR8/2×FR4 per the 800G MSA and IEEE 802.3df (Optics in AI fabrics).

In CodingBox

CodingBox names MSA interfaces from their SFF-8024 codes and CMIS application IDs on Check transceiver — 100G CWDM4, 400G-FR4, 400ZR — so a module's real interface is visible regardless of what the label says.

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