SIST EN 50377-6-2:2005

SLOVENSKI SIST EN 50377-6-2:2005

STANDARD
februar 2005
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Connector sets and interconnect components to be used in optical fibre
communication systems - Product specifications - Part 6-2: Type SC-RJ terminated
on IEC 60793-2 category B1.1 singlemode fibre
ICS 5HIHUHQþQDãWHYLOND
33.180.20
SIST EN 50377-6-2:2005(en)
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---------------------- Page: 1 ----------------------

EUROPEAN STANDARD EN 50377-6-2
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2004

ICS 33.180.20


English version


Connector sets and interconnect components
to be used in optical fibre communication systems -
Product specifications
Part 6-2: Type SC-RJ terminated on IEC 60793-2
category B1.1 singlemode fibre


Jeux de connecteurs et composants Steckverbindersätze
d'interconnexion à utiliser und Verbindungselemente
dans les systèmes de communication für Lichtwellenleiter-
par fibres optiques - Datenübertragungssysteme
Spécifications de produit Teil 6-2: Bauart SC-RJ/PC zum Anschluss
Partie 6-2: Type SC-RJ câblé an Einmodenfasern des Typs B1.1 Faser
sur une fibre unimodale nach IEC 60793-2
de la catégorie B1.1 de la CEI 60793-2




This European Standard was approved by CENELEC on 2004-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50377-6-2:2004 E

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EN 50377-6-2:2004 – 2 –
Foreword

This European Standard was prepared by the Technical Committee CENELEC TC 86BXA, Fibre optic connectors.

The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as
EN 50377-6-2 on 2004-03-01.

The following dates were fixed:

- latest date by which the EN has to be implemented
 at national level by publication of an identical
 national standard or by endorsement (dop) 2005-03-01

- latest date by which the national standards conflicting
 with the EN have to be withdrawn (dow) 2007-03-01

__________

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– 3 – EN 50377-6-2:2004


Connector sets and interconnect components to be used in optical fibre communication systems –
Product specifications

Part: 6-2: Type: SC-RJ/PC terminated on IEC 60793-2-50 category B1.1 fibre

Description Performance
Coupling mechanism: push-pull Application: IEC 61753-2-1 Category U and
 ES 200 671 environments (see 1.3)

Configuration: plug / adaptor / plug Attenuation grades: P: mean ≤ 0,35 dB
(random mate) ≤ 1,0 dB for ≥ 97 % of measurements
 Q: mean ≤ 0,30 dB
Fibre category: IEC 60793-2-50  ≤ 0,6 dB for ≥ 99 % of measurements
 type B1.1
Return loss grades: S: ≥ 26 dB
Cable type see Table 3 (random mate) T: ≥ 35 dB
R: ≥ 40 dB
W: ≥ 45 dB
U: ≥ 50 dB

Related documents:
EN 50173 Information technology – Generic cabling systems
EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and measurement
procedures
EN 61753-2-1 Fibre optic interconnecting devices and passive components performance standard –
Part 2-1: Fibre optic connectors terminated on single-mode fibre for category U –
Uncontrolled environment
EN 61754-4 Fibre optic connector interfaces – Part 4: Type SC connector family
EN 60793-2-50 Optical fibres – Part 2-50: Product specifications – Sectional specification for class B
single-mode fibres
EN 60794-2 Optical fibre cables – Part 2: Indoor cables – Sectional specification
EN 186000-1 Generic specification: Connector sets for optical fibres and cables – Part 1: Requirements,
test methods and qualification approval procedures
ES 200 671 Transmission and Multiplexing (TM) - Passive optical components - Optical fibre
connectors for single-mode optical fibre communication systems - Common requirements
and conformance testing
ETS 300 019 series Equipment engineering (EE) - Environmental conditions and environmental tests for
telecommunications equipment
ISO/IEC 11801 Information technology – Generic cabling for customer premises


Outline and maximum dimensions:

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EN 50377-6-2:2004 – 4 –
Contents
1 Scope . 5
1.1 Product definition . 5
1.2 Intermateability. 5
1.3 Operating environment . 5
1.4 Reliability . 5
1.5 Quality assurance. 5
2 Normative references. 5
3 Description. 7
3.1 SC-RJ plug. 7
3.2 SC-RJ adaptor. 7
3.3 Materials. 7
3.4 Dimensions . 7
3.5 Colour and marking . 7
4 Variants . 8
4.1 Terminated plug. 8
4.2 Adaptor. 8
4.3 Identification of variants. 8
5 Dimensional requirements. 11
5.1 Outline dimensions . 11
5.1.1 SC-RJ plug . 11
5.1.2 SC-RJ adaptor . 12
5.2 Mating face and other limit dimensions. 13
5.2.1 SC-RJ plug . 13
5.2.2 SC-RJ adaptor . 15
5.2.3 Positioning of fibre core. 16
5.2.4 Ferrule endface geometry after termination. 17
5.2.5 Control of fibre axis . 18
5.2.6 Pin gauge for adaptor . 19
6 Tests . 19
6.1 Sample size. 19
6.2 Test and measurement methods . 19
6.3 Test sequence. 19
6.4 Pass/fail criteria . 20
7 Test report . 20
8 Performance requirements. 20
8.1 Dimensional and marking requirements . 20
8.2 Optical performance requirements. 20
8.3 Mechanical performance requirements. 22
8.4 Environmental performance requirements. 26
Annex A (informative) Attenuation reference plug. 29
Annex B (informative) Sample size and product sourcing requirements . 30
Bibliography . 31

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– 5 – EN 50377-6-2:2004
1 Scope
1.1 Product definition
This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental
performance requirements which terminated and assembled single-mode resilient alignment sleeve SC-RJ connector
set (plug / adaptor / plug) must meet in order for it to be categorised as an EN standard product.

Product marking details are given in 3.5.

1.2 Intermateability
Although all products conforming to the requirements of this specification will intermate, the resulting level of
random attenuation performance will only be ensured in accordance with Table 1. The intention is that this will be
true irrespective of the manufacturing source(s) of the product.

In all cases, the intermating of plug variants having different attenuation grades will result in an uncertain level of
random attenuation performance.

Table 1 - Ensured level of random attenuation
Plug variant / attenuation grade P Q
P P
Q Q

Similarly, when intermating plug variants having different return loss classes, the resulting level of return loss cannot
be assured to be any better than the worst return loss class.

A simplex SC plug can be connected in the SC-RJ adaptor without degrading its level of performance.

1.3 Operating environment
The tests selected combined with the severities and durations are representative of an external weather protected
environment defined by

a) EN 61753-2-1 Category U - Uncontrolled environment, and
b) ES 200 671 External weather protected environment defined by ETS 300 019 series, class 3.3, 3.4 and 3.5.

1.4 Reliability
Whilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this
specification does not guarantee the reliability of the product. This should be predicted using a recognised reliability
assessment programme.

1.5 Quality assurance
Compliance with this specification does not guarantee the manufacturing consistency of the product. This should be
maintained using a recognised quality assurance programme.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.

EN 50173 Information technology – Generic cabling systems

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EN 50377-6-2:2004 – 6 –
EN 60793-2-50 Optical fibres – Part 2-50: Product specifications – Sectional specification for class B
single-mode fibres
EN 61300 series Fibre optic interconnecting devices and passive components – Basic test and measurement
procedures
EN 61300-2-1 Part 2-1: Tests – Vibration (sinusoidal)
EN 61300-2-2 Part 2-2: Tests – Mating durability
EN 61300-2-4 Part 2-4: Tests – Fibre/cable retention
EN 61300-2-5 Part 2-5: Tests – Torsion/twist
EN 61300-2-6 Part 2-6: Tests – Tensile strength of coupling mechanism
EN 61300-2-7 Part 2-7: Tests – Bending moment
EN 61300-2-12 Part 2-12: Tests – Impact
EN 61300-2-17 Part 2-17: Tests – Cold
EN 61300-2-18 Part 2-18: Tests – Dry heat – High temperature endurance
EN 61300-2-19 Part 2-19: Tests – Damp heat (steady state)
EN 61300-2-22 Part 2-22: Tests – Change of temperature
EN 61300-2-26 Part 2-26: Tests – Salt mist
EN 61300-2-27 Part 2-27: Tests – Dust – Laminar flow
EN 61300-2-42 Part 2-42: Tests – Static side load for connectors
EN 61300-3-4 Part 3-4: Examinations and measurements – Attenuation
EN 61300-3-6 Part 3-6: Examinations and measurements – Return loss
EN 61300-3-34 Part 3-34: Examinations and measurements – Attenuation of random mated connectors
EN 61753-2-1 Fibre optic interconnecting devices and passive components performance standard –
Part 2-1: Fibre optic connectors terminated on single-mode fibre for category U – Uncontrolled
environment
EN 61754-4 Fibre optic connector interfaces – Part 4: Type SC connector family
EN 186000-1 Generic Specification: Connector sets for optical fibres and cables –
Part 1: Requirements, test methods and qualification approval procedures
ES 200 671 Transmission and Multiplexing (TM) - Passive optical components - Optical fibre connectors
for single-mode optical fibre communication systems - Common requirements and conformance
testing
ETS 300 019 Equipment engineering (EE) - Environmental conditions and environmental tests for
series telecommunications equipment
1)
IEC 61300-2-46 Fibre optic interconnecting devices and passive components – Basic test and measurement
proedures
Part 2-46: Tests – Damp heat cyclic
ISO/IEC 11801 Information technology – Generic cabling for customer premises

1)
At draft stage.

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– 7 – EN 50377-6-2:2004
3 Description
The SC-RJ connector is a duplex plug connector set of plug / adaptor / plug configuration characterised by two
cylindrical, spring loaded butting ferrule of 2,5 mm nominal diameter and a push-pull coupling mechanism. The
optical alignment mechanism of the connector is of a resilient sleeve style.

3.1 SC-RJ plug
The plug features two cylindrical zirconia ceramic ferrules and a push-pull coupling mechanisms. Alternative
materials may be used for the ferrule that have directly compatible material properties as zirconia, but the endface
and performance requirements must be met under all conditions.
The plug housing has a single male key which is used to limit the relative rotation between mated plugs.
A cover (dust cap) to protect the ferrule endface when the plug is in the unmated condition is provided.

3.2 SC-RJ adaptor
The adaptor consists of two zirconia ceramic resilient alignment sleeves and two push-pull coupling mechanisms,
one for each sleeve. Alternative materials may be used for the sleeve that have directly compatible material
properties as zirconia.
The mounting style is a rectangular flange with 2 hole fixing.
The adaptor can either connect to a SC-RJ plug or to two simplex SC plugs according to EN 61754-4. The adaptor
housing has three female keys which are used to limit the relative rotation between mated plugs. One key is used to
position the SC-RJ plug and the other two keys are used to orientate the two simplex SC plugs.
Covers (dust caps) are provided to protect each duplex port of the adaptor.

3.3 Materials
Materials which are not specified or which are not specifically described are left to the discretion of the
manufacturer.

3.4 Dimensions
Outline dimensions and other dimensions necessary to ensure intermateability or which affect performance are
specified. All other dimensions are left to the discretion of the manufacturer. Where the mating face limit dimensions
are not in agreement with an IEC Interface Standard this is clearly stated.

3.5 Colour and marking
Marking of the product shall be in accordance with 2.6.2 of EN 186000-1 in the following order of precedence:

a) identification of manufacturer;
b) manufacturing date code: year / week;
c) manufacturers part number;
d) variant identification number.

The preferred colour scheme is given in Table 2.

Table 2 – Preferred colour scheme
Delatch housing simplex SC plug Delatch housing SC-RJ plug Adaptor
Blue Blue Blue

NOTE The preferred blue is RAL 5015.

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EN 50377-6-2:2004 – 8 –
4 Variants
4.1 Terminated plug
The following fibre/cable variants are given in Table 3.

Table 3 - Plug variants
Variant number Fibre/cable Structure Note
mm
P01 ∅ 0,7 - 1,4 Buffered fibre 1 fibre
P02 Reinforced cable 1 fibre
∅ 1,8 ± 0,2
P03 Reinforced cable 1 fibre
∅ 2,0 ± 0,2
P04
∅ 2,5 ± 0,2 Reinforced cable 1 fibre
P05 ∅ 2,8 ± 0,2 Reinforced cable 1 fibre
P06 ∅ 3,0 ± 0,2 Reinforced cable 1 fibre
P07 Reinforced cable 1 fibre
∅ 3,2 ± 0,2
P08 2,7 * 5,4 Reinforced twin zip cable 2 fibres
Q01 ∅ 0,7 - 1,4 Buffered fibre 1 fibre
Q02 Reinforced cable 1 fibre
∅ 1,8 ± 0,2
Q03 Reinforced cable 1 fibre
∅ 2,0 ± 0,2
Q04
∅ 2,5 ± 0,2 Reinforced cable 1 fibre
Q05 ∅ 2,8 ± 0,2 Reinforced cable 1 fibre
Q06 ∅ 3,0 ± 0,2 Reinforced cable 1 fibre
Q07 ∅ 3,2 ± 0,2 Reinforced cable 1 fibre
Q08 2,7 * 5,4 Reinforced twin zip cable 2 fibres

4.2 Adaptor
The defined adaptor variants are given in Table 4.

Table 4 – Adaptor variants
Variant number Format
C01 Rectangular flange – Duplex

4.3 Identification of variants
The identification numbers for the fibre/cable variants and adaptor variants with fibre category IEC 60793-2-50 are
given in Tables 5, 6 and 7.

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– 9 – EN 50377-6-2:2004
Table 5 – P grade plugs
Variant number Performance class Identification number
(Return loss)
P01 S EN50377-6-2-P01-S
P01 T EN50377-6-2-P01-T
P01 R EN50377-6-2-P01-R
P01 W EN50377-6-2-P01-W
P01 U EN50377-6-2-P01-U
P02 S EN50377-6-2-P02-S
P02 T EN50377-6-2-P02-T
P02 R EN50377-6-2-P02-R
P02 W EN50377-6-2-P02-W
P02 U EN50377-6-2-P02-U
P03 S EN50377-6-2-P03-S
P03 T EN50377-6-2-P03-T
P03 R EN50377-6-2-P03-R
P03 W EN50377-6-2-P03-W
P03 U EN50377-6-2-P03-U
P04 S EN50377-6-2-P04-S
P04 T EN50377-6-2-P04-T
P04 R EN50377-6-2-P04-R
P04 W EN50377-6-2-P04-W
P04 U EN50377-6-2-P04-U
P05 S EN50377-6-2-P05-S
P05 T EN50377-6-2-P05-T
P05 R EN50377-6-2-P05-R
P05 W EN50377-6-2-P05-W
P05 U EN50377-6-2-P05-U
P06 S EN50377-6-2-P06-S
P06 T EN50377-6-2-P06-T
P06 R EN50377-6-2-P06-R
P06 W EN50377-6-2-P06-W
P06 U EN50377-6-2-P06-U
P07 S EN50377-6-2-P07-S
P07 T EN50377-6-2-P07-T
P07 R EN50377-6-2-P07-R
P07 W EN50377-6-2-P07-W
P07 U EN50377-6-2-P07-U
P08 S EN50377-6-2-P08-S
P08 T EN50377-6-2-P08-T
P08 R EN50377-6-2-P08-R
P08 W EN50377-6-2-P08-W
P08 U EN50377-6-2-P08-U

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EN 50377-6-2:2004 – 10 –
Table 6 – Q grade plugs
Variant number Performance class Identification number
(Return loss)
Q01 S EN50377-6-2-Q01-S
Q01 T EN50377-6-2-Q01-T
Q01 R EN50377-6-2-Q01-R
Q01 W EN50377-6-2-Q01-W
Q01 U EN50377-6-2-Q01-U
Q02 S EN50377-6-2-Q02-S
Q02 T EN50377-6-2-Q02-T
Q02 R EN50377-6-2-Q02-R
Q02 W EN50377-6-2-Q02-W
Q02 U EN50377-6-2-Q02-U
Q03 S EN50377-6-2-Q03-S
Q03 T EN50377-6-2-Q03-T
Q03 R EN50377-6-2-Q03-R
Q03 W EN50377-6-2-Q03-W
Q03 U EN50377-6-2-Q03-U
Q04 S EN50377-6-2-Q04-S
Q04 T EN50377-6-2-Q04-T
Q04 R EN50377-6-2-Q04-R
Q04 W EN50377-6-2-Q04-W
Q04 U EN50377-6-2-Q04-U
Q05 S EN50377-6-2-Q05-S
Q05 T EN50377-6-2-Q05-T
Q05 R EN50377-6-2-Q05-R
Q05 W EN50377-6-2-Q05-W
Q05 U EN50377-6-2-Q05-U
Q06 S EN50377-6-2-Q06-S
Q06 T EN50377-6-2-Q06-T
Q06 R EN50377-6-2-Q06-R
Q06 W EN50377-6-2-Q06-W
Q06 U EN50377-6-2-Q06-U
Q07 S EN50377-6-2-Q07-S
Q07 T EN50377-6-2-Q07-T
Q07 R EN50377-6-2-Q07-R
Q07 W EN50377-6-2-Q07-W
Q07 U EN50377-6-2-Q07-U
Q08 S EN50377-6-2-Q08-S
Q08 T EN50377-6-2-Q08-T
Q08 R EN50377-6-2-Q08-R
Q08 W EN50377-6-2-Q08-W
Q08 U EN50377-6-2-Q08-U

Table 7 – Adaptor variants
Variant number Identification number
C01 EN50377-6-2-C01

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– 11 – EN 50377-6-2:2004
5 Dimensional requirements
5.1 Outline dimensions
5.1.1 SC-RJ plug
Variant No. P01 - P08 / Q01 - Q08. See Figure 1.


















Dimensions
Ref. Note
mm
Min. Max.
A 16,8
B 14,8
C 11,2
D  9,1
E 33,3
F 58,4
G 57,0

Figure 1 – Outline dimensions - SC-RJ plug

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EN 50377-6-2:2004 – 12 –
5.1.2 SC-RJ adaptor
Variant No. C01. See Figure 2.
















Panel cut-out





Dimensions
Ref. Note
Min. mm Max.
H 16,1
I 13,2
J 19,3 19,4
K 22,6
L 14,6
M  4,2
N 33,0
O 2,4 2,6 diameter
P  5,8
PA 13,6 14,2
PB 16,2 16,4


NOTE Panel thickness should be between 1,0 mm and 3,5 mm.

Figure 2 – Outline dimensions - SC-RJ adaptor

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– 13 – EN 50377-6-2:2004
5.2 Mating face and other limit dimensions
5.2.1 SC-RJ plug
The mating face dimensions are in accordance with EN 61754-4 and listed to illustrate the intermateability between
SC plug and SC-RJ plug against the SC-RJ adaptor. See Figure 3.
















Section B – B


Section A – A


























Figure 3 – Plug mating face and other limit dimensions

---------------------- Page: 14 ----------------------

EN 50377-6-2:2004 – 14 –

Dimensions
Ref. Note
Min. mm Max.
A 16,2 16,8
B 14,5 14,8
C 10,8 11,2
D 8,9 9,1
Q 2,498 5 2,499 5 diameter
R 4,8 5,0 diameter
S 8,9 9,1
T 5,2 5,3
U 6,6 6,8
V 19 23 degree
W 25 35 degree
X 7,15 7,5 see notes 1, 2
Y 0,8 1,2
Z 5,3 5,5
AA -0,1 0,05 3
AB 2,11 2,5
AC 2 2,8
AD 6,6 6,8
AE 1,6 1,8
AF 0,8 0,9 radius
AG 4,05 4,15
AH 5,4 5,6
AI 0 0,5
AJ 1,6 1,8
AK 7,3 7,4 see note 4


NOTE 1 Ferrule compression force shall be from 7,8 N to 11,8 N when the ferrule is compressed to a point where X is 7,00 ± 0,10 mm.
NOTE 2 This value shows the dimension after the ferrule is polished and in the unmated condition.
NOTE 3 The negative dimension refers to the position of the inside bottom plane left - direction relative to the mechanical reference plane.
NOTE 4 Plugs shall be capable of floating between the AK min. and AK max.
NOTE 5 Mechanical reference plane.

Figure 3 – Plug mating face and other limit dimensions (continued)

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– 15 – EN 50377-6-2:2004
5.2.2 SC-RJ adaptor
See Figure 4.
















Dimensions
Ref. Note
Min. mm Max.
P  4,9  5,8
AK  7,3  7,4 see note 2
AL  2,7  2,8 diameter, see note 1
AM  4,69 4,79 diameter
AN -0,06 1,0
AO  5,51 5,9
AP  6,9  7,1
AQ  3,8  4,04
AR  5,0  5,3
AS 14,7 15,2
AT 10,8 11,2
AU  9,0  9,1
AV  0,65 0,75
AW  0,4  0,8
AX 27   33   degree
AY  2,0  2,2


NOTE 1 The connector alignment feature is a resilient sleeve. The sleeve is free to rotate in the adaptor and a typical position of the split is
shown. The feature must accept a pin gauge to the centre of the adaptor with a force of 2,0 N to 5,9 N under the condition that another pin gauge
is inserted into the feature from the other side. The centre of the adaptor is defined by the right side position of the dimension AP.
NOTE 2 Adaptor has fixed dimensions.
NOTE 3 Mechanical reference plane.

Figure 4 – Adaptor mating face and other limit dimensions

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EN 50377-6-2:2004 – 16 –
5.2.3 Positioning of fibre core
The shaded areas in the figure below denote the target area in which the fibre core must be positioned during the
plug termination process (without delatch housing). To obtain the performances indicated by grade P or Q, the fibre
core must be positioned within the shaded segments shown.



Grade Q Grade P

Figure 5a – Positioning of fibre core to ferrule centre and connector key (without delatch housing)

The shaded areas in the figure below denote the target area in which the fibre core must be positioned during the
plug termination process (with SC-RJ delatch housing). This ensures the intermateability of the use of SC-RJ plug as
well as simplex SC plugs in a SC-RJ adaptor. To obtain the performances indicated by grade P or Q, the fibre core
must be positioned within the shaded segments shown.



Grade Q Grade P

Ref. Dimensions Note
Min. mm Max.
 Grade P Grade Q
A  0,000 8 diameter, see 5.2.5
B  50 degree
C  0,001 5 see 5.2.5
D 0,003 diameter, see 5.2.5
AK  see 5.2.1 and 5.2.2

NOTE Grade Q does not imply the use of tuning or define the number of tuning positions.

Figure 5b – Positioning of fibre core to ferrule centre and connector key (with SC-RJ delatch housing)

---------------------- Page: 17 ----------------------

– 17 – EN 50377-6-2:2004
5.2.4 Ferrule endface geometry after termination
See Figure 6.













DETAIL A




Dimensions
Ref. Note
Min. mm Max.
BF 10 25 see notes 1, 2
BG 1,9 2,26 diameter
BI 25 35 degree
BK -0,000 1 see chart below see notes 3, 5


NOTE 1 Dome eccentricity of the spherically polished endface shall be less than 50 µm.
NOTE 2 The radius shall be measured over a diameter of 0,25 mm.
NOTE 3 The negative dimension refers to fibre protrusion.
NOTE 4 A chamfer or radius is allowed to a maximum depth of 1,2 mm from the ferrule endface.
NOTE 5 Dimension BK shall be measured in accordance with EN 61300-3-23.
NOTE 6 Visual examination with x200 magnification of fibre endface after cleaning. No defects, dirt or residues shall be visible in the core zone.
NOTE 7 Fibre endface.

Allowable undercut versus ferrule endface radius
140
120
100
80
60
40
20
0
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
Ferrule endface radius BF (mm)


The value of the undercut BK(BF) is:

3 2
BK(BF) = -0,02 BF + 1,3 BF – 31 BF + 325 10 mm ≤ BF ≤ 25 mm

Figure 6 – Ferrule endface geometry - After termination

Undercut BK(BF)
(nm)

---------------------- Page: 18 ----------------------

EN 50377-6-2:2004 – 18 –
5.2.5 Control of fibre axis
Figure 7 shows the relationship between the axis of the fibre and the position of the fibre core relative to the optical
datum (see 5.2.3).

Fibre axis
Ferrule axis
τ



1.5
Fibre angle τ
1.4
(degree)
1.3
1.2
1.1
1
Note 2
0.9
0.8
0.7
0.6
0.5 Note 1
0.4
0.3
0.2
0.1
0
0 0.1
...