FIELD GUIDESource-led reference

P223 / Pluggable I/O / Connector

CFP4 host connector form

CFP4 uses a 56-position compact pluggable-I/O connector form in the documented Amphenol series.

Also called CFP4 CFP4 connector CFP4 cage

CFP4 and CFP2 are different host interfaces even when both appear in high-speed optical systems.

Look for

Use host labeling and cage dimensions/documentation to distinguish CFP4 from CFP2 and QSFP-family interfaces.

Claim inspection dates: 2026-10-05, 2026-10-22 · Independent review pending

The useful distinction

Recognize it. Then verify it.

CFP4 uses a 56-position compact pluggable-I/O connector form in the documented Amphenol series. [C223A]

Exact source example P223: construction: 56positions;insert-moulded top-contact assemblies with press-fit cage system. durability cycles: 200. voltage vdc: 3.3. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred. No physical compatibility, pin map or hardware validation is established. [C223C]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Nominal contacts56S227Source-backed nominal position count: 56.
Positions / cavity span56 (Claim C223A); 56 (Claim C223B)S227 · S247Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V40 engineering-reference fact only; independent human review remains pending. This claim does not approve fabrication, rewiring, substitution, electrical safety, protocol support or end-to-end compatibility.
Contact pitch0.6 mm Example CFP4 connector pitch (Recorded example component); 0.6 mm Source-described pitch / centerline (Claim C223B); 0.6 mm published contact centerlineS247 · S926Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. example_component; CFP4 host connector example V40 engineering-reference fact only; independent human review remains pending. This claim does not approve fabrication, rewiring, substitution, electrical safety, protocol support or end-to-end compatibility. Named series only, not every family part: CFP4 U99-C hostconnector. Documented role: host connector. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred.
Connector rolehost connectorS926Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: CFP4 U99-C hostconnector. Documented role: host connector. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred.
ManufacturerAmphenol Communications SolutionsS926Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: CFP4 U99-C hostconnector. Documented role: host connector. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred.
SeriesCFP4 U99-C hostconnectorS926Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: CFP4 U99-C hostconnector. Documented role: host connector. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred.

Not recorded: Populated contacts, Contact rows, Dimensions / axis, Contact gender / arrangement, Mounting, Coupling / latch, Keying / polarization, Shell / form, Exact part / implementation, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • Position/contact count and any example-component pitch do not establish a universal pinout, cable construction or protocol capability.
  • No fabrication dimensions or face-view pin locator is published unless explicitly stated.
  • Prior view context (not a source-view value): Position count is published without a V40 mating-face numbering locator.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

CFP4 host connector form facts and limitations
Documented identificationCFP4 56-position host connector form. [C223A]
Mechanical dimensionsNo independently reviewed mechanical drawing in V39; do not use this page for fabrication, fit testing or tolerance work.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Use the source-backed form or position count only for identification. Resolve ratings, protocol, direction, wiring, cable construction and exact device support from the relevant equipment and component documentation.

Before you connect

What to check

  1. Identify the exact connector family and variant from the equipment or cable documentation.
  2. Keep shape, contact count, protocol, electrical rating and device support as separate facts.
  3. Do not force, rewire or adapt a connector from this recognition record; resolve the remaining requirements first.
Trace a supported connection class →

What is not established

This field note does not approve a connection, adapter, cable assembly, rewiring scheme or fabricated part. It intentionally omits unsupported pin assignments and mechanical tolerances.

Your next step

Move from the form to the requirement.

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C223ASource checked · pending review

Amphenol identifies CFP4 as a 56-position pluggable-I/O connector form.

Amphenol Communications Solutions · CFP2 / CFP4 connectors ↗

Locator: CFP2 and CFP4 overview
Access: public page. Identification/reference scope only. V39 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

S227: full source recordInspect review dependencies → (private workspace)

Claim scope: V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.. Next review due 2027-01-03.

Back to first citation ↑
C223CSource checked · pending review

Exact source example P223: construction: 56positions;insert-moulded top-contact assemblies with press-fit cage system. durability cycles: 200. voltage vdc: 3.3. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred. No physical compatibility, pin map or hardware validation is established.

Amphenol Communications Solutions · CFP4 connector technical sheet ↗

Locator: pp.1–2TechnicalInformation,PartNumberSelector
Access: public pdf text. No independent technical review, hardware validation, specimen measurement or general interoperability approval. Exact scopes and unresolved fields remain controlling.

S926: full source recordInspect review dependencies → (private workspace)

Claim scope: Exact named component/family technical construction reference from the full current primary document; geometry, ratings and implementation limits do not transfer to other variants.. Next review due 2027-01-20.

Suggest a correction to this field note →

Put this field note to work.

Add to discovery trayRecord an unsaved candidate (private workspace)

Compare look-alikes: CFP2 versus CFP4 host forms

Candidate selection does not confirm the identity or capabilities of your physical item.

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 2 scoped claims · 0 sources with inspection/access flags.

Page scope: catalogue_expansion_v39

Assessment 2026-10-22 · earliest scheduled source review 2027-01-03. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 2 source scopes, access limits and dates

S227 · CFP2 / CFP4 connectors

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-05 · due 2027-01-03

Within inspection window

Scoped support: Identifies CFP2 as a 104-position and CFP4 as a 56-position pluggable-I/O connector family.

Not established / limitations: Identification/reference scope only. V39 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

Locator: CFP2 and CFP4 overview

S926 · CFP4 connector technical sheet

Amphenol Communications Solutions · Manufacturer / product-owner domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: Current primary-document research for P223. Each normalized fact retains its exact part/family, role and document scope.

Not established / limitations: No independent technical review, hardware validation, specimen measurement or general interoperability approval. Exact scopes and unresolved fields remain controlling.

Locator: pp.1–2TechnicalInformation,PartNumberSelector

Trace 2 claims to their source records

C223A · P223

Amphenol identifies CFP4 as a 56-position pluggable-I/O connector form.

Claim scope: V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.

Source links: S227 · Evidence trail → (private workspace)

C223C · P223

Exact source example P223: construction: 56positions;insert-moulded top-contact assemblies with press-fit cage system. durability cycles: 200. voltage vdc: 3.3. Complete ordering suffix not selected;cage/heat-sink option dimensions and3mmPCBthickness are not connector envelope.; Port count1x1/1x2/1x4 is cage port count,not contact row count. No row count inferred. No physical compatibility, pin map or hardware validation is established.

Claim scope: Exact named component/family technical construction reference from the full current primary document; geometry, ratings and implementation limits do not transfer to other variants.

Source links: S926 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.