Side by side

CFP2 versus CFP4 host forms

Is the pluggable host connector the 104-position CFP2 form or the 56-position CFP4 form?

Computer-generated illustration, not a photograph. — P222 · ConnectorCFP2 host connector form

How they differ

CFP2 host connector form Confirm the host cage/module label and form-factor documentation before treating a pluggable module as CFP2.
CFP4 host connector form Use host labeling and cage dimensions/documentation to distinguish CFP4 from CFP2 and QSFP-family interfaces.

Then askIs the pluggable host connector the 104-position CFP2 form or the 56-position CFP4 form?

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
Field	CFP2 host connector form	CFP4 host connector form
Type	Connector	Connector
Family	Pluggable I/O	Pluggable I/O
Shape	rectangular	rectangular
Nominal contacts	104S227Source-backed nominal position count: 104.	56S227Source-backed nominal position count: 56.
Positions / cavity span	104 (Claim C222A); 104 (Claim C222B)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.	56 (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 rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	host connectorS925Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: CFP2 U90hostconnector. 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.	host 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.
Key distinction	CFP2 form factor identity does not by itself establish the optical module type or implemented link standard.	CFP4 and CFP2 are different host interfaces even when both appear in high-speed optical systems.

Full evidence ledger and sources ↓

Illustrations are computer-generated with prior AI visual review; independent technical and rights review pending. A comparison is not a compatibility verdict.

This comparison stays within one evidence layer.

All selected records are Connector records. Similar layer does not mean compatible, interchangeable or safe to mate.

Families represented: Pluggable I/O

The reference ledger

Read the same question across.

2 selected records · 13 fields
No score. No compatibility verdict.

On a narrow screen, scroll the table sideways or open the field-by-field reading view below. Illustrations are not a size comparison.

Comparison of selected field notes; source links accompany each documented specification
What you are comparing	P222 / ConnectorCFP2 host connector form Identification schematic · not to scale · drawing review pending	P223 / ConnectorCFP4 host connector form Identification schematic · not to scale · drawing review pending
Layer	Connector	Connector
Key distinction	CFP2 form factor identity does not by itself establish the optical module type or implemented link standard.	CFP4 and CFP2 are different host interfaces even when both appear in high-speed optical systems.
Nominal contacts	104S227Source-backed nominal position count: 104.	56S227Source-backed nominal position count: 56.
Positions / cavity span	104 (Claim C222A); 104 (Claim C222B)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.	56 (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.
Populated contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rows	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact pitch	0.6 mm Example CFP2 connector pitch (Recorded example component); 0.6 mm Source-described pitch / centerline (Claim C222B); 0.6 mm published contact centerlineS247 · S925Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. example_component; CFP2 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: CFP2 U90hostconnector. 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.	0.6 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.
Dimensions / axis	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector role	host connectorS925Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: CFP2 U90hostconnector. 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.	host 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.
Coupling / latch	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Keying / polarization	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Documented identification	CFP2 104-position host connector form.C222A	CFP4 56-position host connector form.C223A
Evidence	C222A,C222C → Independent review pending	C223A,C223C → Independent review pending

Read field by field — no sideways scrolling

The same selected records, fields, values and source links as the table. Missing fields remain non-equivalent; no values are merged.

Layer

CFP2 host connector formP222 / Connector: Connector
CFP4 host connector formP223 / Connector: Connector

Key distinction

CFP2 host connector formP222 / Connector: CFP2 form factor identity does not by itself establish the optical module type or implemented link standard.
CFP4 host connector formP223 / Connector: CFP4 and CFP2 are different host interfaces even when both appear in high-speed optical systems.

Nominal contacts

CFP2 host connector formP222 / Connector: 104S227Source-backed nominal position count: 104.
CFP4 host connector formP223 / Connector: 56S227Source-backed nominal position count: 56.

Positions / cavity span

CFP2 host connector formP222 / Connector: 104 (Claim C222A); 104 (Claim C222B)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.
CFP4 host connector formP223 / Connector: 56 (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.

Populated contacts

CFP2 host connector formP222 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFP4 host connector formP223 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact rows

CFP2 host connector formP222 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFP4 host connector formP223 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact pitch

CFP2 host connector formP222 / Connector: 0.6 mm Example CFP2 connector pitch (Recorded example component); 0.6 mm Source-described pitch / centerline (Claim C222B); 0.6 mm published contact centerlineS247 · S925Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. example_component; CFP2 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: CFP2 U90hostconnector. 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.
CFP4 host connector formP223 / Connector: 0.6 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.

Dimensions / axis

CFP2 host connector formP222 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFP4 host connector formP223 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Connector role

CFP2 host connector formP222 / Connector: host connectorS925Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: CFP2 U90hostconnector. 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.
CFP4 host connector formP223 / Connector: host 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.

Coupling / latch

CFP2 host connector formP222 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFP4 host connector formP223 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Keying / polarization

CFP2 host connector formP222 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
CFP4 host connector formP223 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Documented identification

CFP2 host connector formP222 / Connector: CFP2 104-position host connector form.C222A
CFP4 host connector formP223 / Connector: CFP4 56-position host connector form.C223A

Evidence

CFP2 host connector formP222 / Connector: C222A,C222C →
Independent review pending
CFP4 host connector formP223 / Connector: C223A,C223C →
Independent review pending

Your next step

Use the distinction in context.

Open the field notes Read source-linked facts and limitations.Compare another pair Start from a common confusion.Check a connection A comparison is not a compatibility verdict.

Continue the distinction

Compare next

Browse every comparison →

OSFP versus QSFP-DD host formsWhich pluggable-I/O host form does the equipment documentation identify? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.SFP versus QSFP-family pluggable I/OWhich host cage and module family is documented? Form factor does not establish link capability.BNC vs TNC coaxial connectorsBNC uses bayonet coupling while TNC uses threaded coupling. Connector family, impedance and application still need to be verified independently.DisplayPort connector vs DisplayPort 2.1The full-size DisplayPort connector does not identify the implemented DisplayPort generation, link rate or optional features.DisplayPort vs Mini DisplayPortFull-size DisplayPort and Mini DisplayPort are different physical forms. Mini DisplayPort shape also appeared on Thunderbolt 1/2 products, so function still needs device evidence.DVI-D dual-link vs DVI-I dual-linkDVI-D and DVI-I use related shells but have different contact arrangements. The analog-contact area is a key physical distinction.

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Add a field note

Evidence behind this page

Scope first. Source second. Approval separate.

3 linked sources · 4 scoped claims · 0 sources with inspection/access flags.

Page scope: Evidence behind the compared records; the editorial comparison still needs separate review.

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 3 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

S925 · CFP2 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 P222. 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

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.

Locator: pp.1–2TechnicalInformation,PartNumberSelector

Trace 4 claims to their source records

C222A · P222

Amphenol identifies CFP2 as a 104-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)

C222C · P222

Exact source example P222: construction: 104positions;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: S925 · Evidence trail → (private workspace)

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 →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.