Side by side

Telephone modular versus 8P8C

Identify the housing without inferring a network or telephone function.

Computer-generated illustration, not a photograph. — P111 · Connector6P4C modular plug (often sold as RJ11)

How they differ

6P4C modular plug (often sold as RJ11) Record the six-position housing and the actual populated contacts; RJ11 wording by itself is not a complete wiring description.
8P8C modular connector (commonly called RJ45) Look for the modular shell and latch. Use the port label and device manual to establish its function; a cable end alone cannot identify a network service.

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
Field	6P4C modular plug (often sold as RJ11)	8P8C modular connector (commonly called RJ45)
Type	Connector	Connector
Family	Telephone	Network
Shape	modular	modular
Nominal contacts	4S091Four populated contacts in a six-position housing; this is not a six-contact observation.	8S020 · S021 · S1918-position modular jack termination reference; nominal engineering count, not automatically positions, population or a device wiring map. 8-position modular jack termination reference
Positions / cavity span	6 (Claim C111A)S091Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Identification and explicitly scoped documentation only; not an end-to-end connection approval	8 (Claim C018A); 8 (Claim C018C); 8 (8P8C); 8 (6-569278-3 / MP-5EU-1)S020 · S191 · S869Separate exact examples; retain each value’s source, role, axis and part scope. Consumer identification / documented standard or product class only T568A/B pair-to-pin termination convention viewed from the front of the jack; not Ethernet-service, cable-category, link-rate or PoE proof Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.
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	plug (135-0337)S923Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 135-0337. Documented role: plug. Flat26AWG is accepted wire, not connector pitch or housing dimension. Generic4–8position wording does not transfer8position non-keyed attribute to other forms.	socket; plug (6-569278-3 / MP-5EU-1)S020 · S021 · S191 · S869Separate exact examples; retain each value’s source, role, axis and part scope. 8-position modular jack termination reference Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.
Key distinction	Count positions and contacts separately.	An RJ45-shaped port is not always an Ethernet port.

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: Telephone · Network

Original recognition plate / Network

8P8C vs 6P4C modular plugs

Side by side source-bounded representations of 8P8C modular connector (commonly called RJ45) and 6P4C modular plug (often sold as RJ11). Left: Wider eight-position modular body. Right: Narrower six-position body, four populated contacts. No pinout, matching size or mating approval. — Cable-end exterior front/underside concept; latch indicated, not a wiring view. The short interior strokes are position-count glyphs, not contact placement or wiring. No size comparison or pinout.

Observe

1. Wider eight-position modular body2. Narrower six-position body, four populated contacts

Verify before choosing

RJ-style trade names do not establish wiring or Ethernet service; examine the port label and documented pinout.

Full visual atlas and sources →Not fabrication art · independent technical review pending

The reference ledger

Read the same question across.

2 selected records · 17 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	P111 / Connector6P4C modular plug (often sold as RJ11) Identification schematic · not to scale · drawing review pending	P018 / Connector8P8C modular connector (commonly called RJ45) Identification schematic · not to scale · drawing review pending
Layer	Connector	Connector
Key distinction	Count positions and contacts separately.	An RJ45-shaped port is not always an Ethernet port.
Nominal contacts	4S091Four populated contacts in a six-position housing; this is not a six-contact observation.	8S020 · S021 · S1918-position modular jack termination reference; nominal engineering count, not automatically positions, population or a device wiring map. 8-position modular jack termination reference
Positions / cavity span	6 (Claim C111A)S091Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Identification and explicitly scoped documentation only; not an end-to-end connection approval	8 (Claim C018A); 8 (Claim C018C); 8 (8P8C); 8 (6-569278-3 / MP-5EU-1)S020 · S191 · S869Separate exact examples; retain each value’s source, role, axis and part scope. Consumer identification / documented standard or product class only T568A/B pair-to-pin termination convention viewed from the front of the jack; not Ethernet-service, cable-category, link-rate or PoE proof Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.
Populated contacts	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	8 (8P8C convention); 8 (6-569278-3 / MP-5EU-1)S020 · S869Separate exact examples; retain each value’s source, role, axis and part scope. Consumer identification / documented standard or product class only Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.
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	Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.	1.02 mm Manufacturer Pitch-Mating Interface (Molex 955012881 board jack)S982Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Exact Molex 95501-2881 right-angle 8P8C board jack; manufacturer mating-interface pitch only, separate from plug geometry or all modular parts.
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	plug (135-0337)S923Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 135-0337. Documented role: plug. Flat26AWG is accepted wire, not connector pitch or housing dimension. Generic4–8position wording does not transfer8position non-keyed attribute to other forms.	socket; plug (6-569278-3 / MP-5EU-1)S020 · S021 · S191 · S869Separate exact examples; retain each value’s source, role, axis and part scope. 8-position modular jack termination reference Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.
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	C2G describes common RJ11 trade usage as a six-position, four-conductor modular form.C111A	Not an equivalent field
Important distinction	That physical description is different from specifying a registered-jack wiring arrangement.C111B	Not an equivalent field
Formal physical descriptor	Not an equivalent field	8P8C modularC018A · C018B
Data rate / PoE	Not an equivalent field	Not established by shapeC018A · C018B
Source-scoped component distinction	Not an equivalent field	CommScope identifies 6-569278-3 / MP-5EU-1 as an unshielded 8P8C modular plug kit. Its linked drawing 2843004 lists that exact material number on the unshielded sheet, separately from shielded variants.C018E
Evidence	C111A,C111B → Independent review pending	C018A,C018B,C018D,C018C,C018E,C018W → 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

6P4C modular plug (often sold as RJ11)P111 / Connector: Connector
8P8C modular connector (commonly called RJ45)P018 / Connector: Connector

Key distinction

6P4C modular plug (often sold as RJ11)P111 / Connector: Count positions and contacts separately.
8P8C modular connector (commonly called RJ45)P018 / Connector: An RJ45-shaped port is not always an Ethernet port.

Nominal contacts

6P4C modular plug (often sold as RJ11)P111 / Connector: 4S091Four populated contacts in a six-position housing; this is not a six-contact observation.
8P8C modular connector (commonly called RJ45)P018 / Connector: 8S020 · S021 · S1918-position modular jack termination reference; nominal engineering count, not automatically positions, population or a device wiring map. 8-position modular jack termination reference

Positions / cavity span

6P4C modular plug (often sold as RJ11)P111 / Connector: 6 (Claim C111A)S091Recorded source-scoped values; named examples do not describe every family variant or establish compatibility. Identification and explicitly scoped documentation only; not an end-to-end connection approval
8P8C modular connector (commonly called RJ45)P018 / Connector: 8 (Claim C018A); 8 (Claim C018C); 8 (8P8C); 8 (6-569278-3 / MP-5EU-1)S020 · S191 · S869Separate exact examples; retain each value’s source, role, axis and part scope. Consumer identification / documented standard or product class only T568A/B pair-to-pin termination convention viewed from the front of the jack; not Ethernet-service, cable-category, link-rate or PoE proof Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.

Populated contacts

6P4C modular plug (often sold as RJ11)P111 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
8P8C modular connector (commonly called RJ45)P018 / Connector: 8 (8P8C convention); 8 (6-569278-3 / MP-5EU-1)S020 · S869Separate exact examples; retain each value’s source, role, axis and part scope. Consumer identification / documented standard or product class only Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.

Contact rows

6P4C modular plug (often sold as RJ11)P111 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
8P8C modular connector (commonly called RJ45)P018 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact pitch

6P4C modular plug (often sold as RJ11)P111 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
8P8C modular connector (commonly called RJ45)P018 / Connector: 1.02 mm Manufacturer Pitch-Mating Interface (Molex 955012881 board jack)S982Current primary-source scoped values; named examples remain separate and unknowns are not inferred from illustrations. Exact Molex 95501-2881 right-angle 8P8C board jack; manufacturer mating-interface pitch only, separate from plug geometry or all modular parts.

Dimensions / axis

6P4C modular plug (often sold as RJ11)P111 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
8P8C modular connector (commonly called RJ45)P018 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Connector role

6P4C modular plug (often sold as RJ11)P111 / Connector: plug (135-0337)S923Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. 135-0337. Documented role: plug. Flat26AWG is accepted wire, not connector pitch or housing dimension. Generic4–8position wording does not transfer8position non-keyed attribute to other forms.
8P8C modular connector (commonly called RJ45)P018 / Connector: socket; plug (6-569278-3 / MP-5EU-1)S020 · S021 · S191 · S869Separate exact examples; retain each value’s source, role, axis and part scope. 8-position modular jack termination reference Exact named example 6-569278-3 / MP-5EU-1: 8P8C modular plug kit. Exact example only; no universal geometry, electrical compatibility, fabrication approval or wiring instruction. Correction applies to this named plug example; preserve separate generic jack orientation and other role values. No T568 wiring map derived.

Coupling / latch

6P4C modular plug (often sold as RJ11)P111 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
8P8C modular connector (commonly called RJ45)P018 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Keying / polarization

6P4C modular plug (often sold as RJ11)P111 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
8P8C modular connector (commonly called RJ45)P018 / Connector: Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Documented identification

6P4C modular plug (often sold as RJ11)P111 / Connector: C2G describes common RJ11 trade usage as a six-position, four-conductor modular form.C111A
8P8C modular connector (commonly called RJ45)P018 / Connector: Not an equivalent field

Important distinction

6P4C modular plug (often sold as RJ11)P111 / Connector: That physical description is different from specifying a registered-jack wiring arrangement.C111B
8P8C modular connector (commonly called RJ45)P018 / Connector: Not an equivalent field

Formal physical descriptor

6P4C modular plug (often sold as RJ11)P111 / Connector: Not an equivalent field
8P8C modular connector (commonly called RJ45)P018 / Connector: 8P8C modularC018A · C018B

Data rate / PoE

6P4C modular plug (often sold as RJ11)P111 / Connector: Not an equivalent field
8P8C modular connector (commonly called RJ45)P018 / Connector: Not established by shapeC018A · C018B

Source-scoped component distinction

6P4C modular plug (often sold as RJ11)P111 / Connector: Not an equivalent field
8P8C modular connector (commonly called RJ45)P018 / Connector: CommScope identifies 6-569278-3 / MP-5EU-1 as an unshielded 8P8C modular plug kit. Its linked drawing 2843004 lists that exact material number on the unshielded sheet, separately from shielded variants.C018E

Evidence

6P4C modular plug (often sold as RJ11)P111 / Connector: C111A,C111B →
Independent review pending
8P8C modular connector (commonly called RJ45)P018 / Connector: C018A,C018B,C018D,C018C,C018E,C018W →
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.

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Browse every comparison →

etherCON versus ordinary 8P8C modularIs the interface a ruggedized locking etherCON system or a conventional 8P8C modular port? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.Telephone modular formsPositions, populated contacts and port role are separate observations.M12 A-coded versus B-coded versus L-codedWhich M12 coding and intended domain does the equipment documentation specify? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.M12 D-, X- and Y-coded data/hybrid formsDoes the exact interface require D-coded, X-coded or Y-coded M12 rather than merely an M12 shell? Connector identity and manufacturer ratings are only reference layers; exact circuit, wiring, installation and equipment requirements still need qualified documentation.M12 D-coded versus X-coded EthernetWhich M12 coding and position pattern is documented for the Ethernet port? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.M8 A-coded versus D-codedWhich M8 coding is documented: A-coded signal/sensor or D-coded data? Connector-family identity is only the first layer; implementation-specific electrical and protocol requirements still need exact documentation.

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Evidence behind this page

Scope first. Source second. Approval separate.

8 linked sources · 8 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 2026-12-30. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 8 source scopes, access limits and dates

S020 · RJ45 connectors

TE Connectivity · Manufacturer / product-owner domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: 8P8C physical family; exact implementation remains product-specific.

Not established / limitations:

Locator: RJ45 / 8-position modular product family

S021 · USB to RJ45 FTDI console cable

Cable Matters · Manufacturer / product-owner domain · inspected 2026-10-01 · due 2026-12-30

Within inspection window

Scoped support: Scoped counterexample: an RJ45-shaped connection can be serial console rather than Ethernet.

Not established / limitations:

Locator: Console cable description

S091 · Modular connector identification guide

C2G / Legrand · Manufacturer / product-owner domain · inspected 2026-10-03 · due 2027-01-01

Within inspection window

Scoped support: 6P6C, common 6P4C trade naming, and the four-position handset form.

Not established / limitations: Trade names are not exact registered-jack wiring declarations. No telephone voltage, line count, crimping or network-speed inference.

Locator: 6-pin RJ-12; 4-pin RJ-11; RJ-22

S191 · Differences Between Wiring Codes T568A vs T568B

Fluke Networks · Manufacturer / product-owner domain · inspected 2026-10-05 · due 2027-01-03

Within inspection window

Scoped support: Eight-position modular termination convention: green/orange pair swap between T568A and T568B, with diagrams described from the front of the jack.

Not established / limitations: Termination convention only. It does not establish that an 8P8C-shaped port is Ethernet, its link rate, PoE support or cable-category performance.

Locator: T568A versus T568B pair-to-pin differences and diagram orientation note

S500 · Phoenix Contact 1561797 — end-specific network and protection scope

Phoenix Contact · Manufacturer / product-owner domain · inspected 2026-10-11 · due 2027-01-09

Within inspection window

Scoped support: Named 1561797 M12 D-coded to RJ45 cable only; separate end ratings must not be projected onto the complete installation.

Not established / limitations: Named 1561797 M12 D-coded to RJ45 cable only; separate end ratings must not be projected onto the complete installation. No raw HTML or manufacturer image archive is represented as retained.

Locator: Product description; Interfaces; Connector / Connection 1 and Connection 2; linked product photograph 244868 and male-side drawing 144634

S612 · 6-569278-3 / MP-5EU-1 modular plug kit

CommScope · Manufacturer / product-owner domain · inspected 2026-10-13 · due 2027-01-11

Within inspection window

Scoped support: Exact kit identity; not a completed cable or a compatibility claim with TE 5-569278-3.

Not established / limitations: Exact kit identity; not a completed cable or a compatibility claim with TE 5-569278-3. No engineering dimensions or universal wiring assignments added.

Locator: Product heading, 8P/8C unshielded kit description, and linked customer drawing 2843004.

S613 · 2843004 — MP-5ES/5EU modular plug customer drawing

CommScope · Manufacturer / product-owner domain · inspected 2026-10-13 · due 2027-01-11

Within inspection window

Scoped support: Unshielded sheet-1 example only; no shield, strain-relief boot or fitted cable inferred.

Not established / limitations: Unshielded sheet-1 example only; no shield, strain-relief boot or fitted cable inferred. No engineering dimensions or universal wiring assignments added.

Locator: Both sheets visually inspected. Sheet 1 lists 6-569278-3 / MP-5EU-1 and the unshielded eight-contact plug; sheet 2 is shielded. Title block shows revision F, despite URL filename suffix c.

S982 · Molex 95501 modular-jack series chart, exact4/4,6/4,6/6,8/8 variants

Molex · Manufacturer / product-owner domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: Exact named right-angle board-jack rows only; no plug-role geometry transfer.

Not established / limitations: P111/P112 are plug records, so jack values are counterpart context only and excluded from their pitch numerator. Port Configuration1x1 is not contact-row count. No Number of Rows field or inspected face drawing on this chart.

Locator: Full Export Spreadsheet table: exact955012441,955012641,955012661,955012881 rows. Web Description identifies modular JACK; Pitch-Mating Interface1.02 mm differs from Pitch-Termination Interface1.27 mm; Positions/Loaded Contacts4/4,6/4,6/6,8/8.

Trace 8 claims to their source records

C018A · P018

The common RJ45-style modular connector family has eight positions and eight contacts.

Claim scope: Consumer identification / documented standard or product class only

Source links: S020 · Evidence trail → (private workspace)

C018B · P018

A manufacturer’s RJ45 console cable is a concrete example of this shape being used for serial console, not Ethernet.

Claim scope: Narrowly stated supporting distinction; not an end-to-end device guarantee

Source links: S021 · Evidence trail → (private workspace)

C018C · P018

T568A and T568B use the same eight-position modular termination but swap the green and orange pairs: T568A places green on pins 1–2 and orange on 3 and 6; T568B places orange on 1–2 and green on 3 and 6.

Claim scope: T568A/B pair-to-pin termination convention viewed from the front of the jack; not Ethernet-service, cable-category, link-rate or PoE proof

Source links: S191 · Evidence trail → (private workspace)

C018D · P018

For Phoenix Contact cable 1561797, the manufacturer lists IP65/IP67 under the M12 end and IP20 under the RJ45 end. The M12 end rating does not establish the same protection for the RJ45 end or a complete installation.

Claim scope: V121 named-product or explicitly scoped manufacturer distinction only; no wiring instruction, independent engineering approval or end-to-end compatibility guarantee.

Source links: S500 · Evidence trail → (private workspace)

C018E · P018

CommScope identifies 6-569278-3 / MP-5EU-1 as an unshielded 8P8C modular plug kit. Its linked drawing 2843004 lists that exact material number on the unshielded sheet, separately from shielded variants.

Claim scope: Named plug kit, not a completed lead, installed-port function, cable-category test or PoE verdict. No equivalence to similarly numbered TE parts is asserted.

Source links: S612 · S613 · Evidence trail → (private workspace)

C018W · P018

Molex identifies 95501-2881 as a right-angle 8P8C modular jack. Its chart separates 1.02 mm mating-interface pitch from 1.27 mm termination-interface pitch.

Claim scope: Exact Molex 95501-2881 right-angle 8P8C board jack; manufacturer mating-interface pitch only, separate from plug geometry or all modular parts.

Source links: S982 · Evidence trail → (private workspace)

C111A · P111

C2G describes common RJ11 trade usage as a six-position, four-conductor modular form.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S091 · Evidence trail → (private workspace)

C111B · P111

That physical description is different from specifying a registered-jack wiring arrangement.

Claim scope: Identification and explicitly scoped documentation only; not an end-to-end connection approval

Source links: S091 · 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.