Amendment 1 - Communication networks and systems for power utility automation - Part 9-2: Specific communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3

Amendement 1 - Réseaux et systèmes de communication pour l'automatisation des systèmes électriques - Partie 9-2: Mise en correspondance des services de communication spécifiques (SCSM) - Valeurs échantillonnées sur ISO/IEC 8802-3

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Publication Date
11-Feb-2020
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IEC 61850-9-2:2011/AMD1:2020 - Amendment 1 - Communication networks and systems for power utility automation - Part 9-2: Specific communication service mapping (SCSM) - Sampled values over ISO/IEC 8802-3
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IEC 61850-9-2
Edition 2.0 2020-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Communication networks and systems for power utility automation –
Part 9-2: Specific communication service mapping (SCSM) – Sampled values
over ISO/IEC 8802-3
Réseaux et systèmes de communication pour l'automatisation des systèmes
électriques –
Partie 9-2: Mise en correspondance des services de communication spécifiques
(SCSM) – Valeurs échantillonnées sur ISO/IEC 8802-3
IEC 61850-9-2:2011-09/AMD1:2020-02(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61850-9-2
Edition 2.0 2020-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Communication networks and systems for power utility automation –
Part 9-2: Specific communication service mapping (SCSM) – Sampled values
over ISO/IEC 8802-3
Réseaux et systèmes de communication pour l'automatisation des systèmes
électriques –
Partie 9-2: Mise en correspondance des services de communication spécifiques
(SCSM) – Valeurs échantillonnées sur ISO/IEC 8802-3
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.200 ISBN 978-2-8322--7380-7

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
FOREWORD
This amendment has been prepared by IEC technical committee 57: Power systems
management and associated information exchange.
The text of this amendment is based on the following documents:
FDIS Report on voting
57/2112/FDIS 57/2135/RVD

Full information on the voting for the approval of this amendment can be found in the report

on voting indicated in the above table.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC website under

"http://webstore.iec.ch" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
_____________
2 Normative references
Remove the following existing references:
IEC/TR 61850-1
IEC 61850-7-1
IEC 61850-7-4
IEC 60874-10-1
IEC 60874-10-2
IEC 60874-10-2
ISO/IEC 7498-1
Add the following new references:

IEC 61588:2009, Precision clock synchronization protocol for networked measurement and

control systems
---------------------- Page: 4 ----------------------
IEC 61850-9-2:2011/AMD1:2020 – 3 –
© IEC 2020

IEC/IEEE 61850-9-3, Communication networks and systems for power utility automation -

Part 9-3: Precision Time Protocol Profile for Power Utility Automation

IEC TR 61850-90-4, Communication networks and systems for power utility automation - Part

90-4: Network engineering guidelines
ISO 4217:2015, Code for the representation of currencies
RFC 2460, Internet Protocol, Version 6 (IPv6) Specification, IETF, available at
http://www.ietf.org
Update the following existing references:

IEC TS 61850-2, Communication networks and systems for power utility automation - Part 2:

Glossary

IEC TS 62351-6 , Power systems management and associated information exchange - Data

and communications security - Part 6: Security for IEC 61850

IEC 62439-3:2016, Industrial communication networks - High availability automation networks

- Part 3: Parallel Redundancy Protocol (PRP) and High-availability Seamless Redundancy

(HSR)
ISO/IEC/IEEE 8802-3, Standard for Ethernet
4 Abbreviations
Remove the following abbreviations:
CSMA/CD
ECT
EVT
GSSE
MAU
Add the following new abbreviation:
PTP
Precision Time Protocol, referring to IEC 61588:2009
____________
Under preparation. Stage at the time of publication: IEC TS/PRVC 62351-6:2020.
---------------------- Page: 5 ----------------------
– 4 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
5 Communication stack
5.2 Client/server services and communication profiles
Replace the existing text of Subclause 5.2 by the following new text:
Content removed; see IEC 61850-8-1.
5.3 SV service and communication profile
5.3.1 SV mapping overview
Table 4 – Service requiring SV communication profile
Replace existing Table 4 with the following new Table 4:
Model IEC 61850-7-2 service
Multicast sampled value class model Multicast SV message
Unicast sampled value class model Unicast SV message (deprecated)
5.3.2 A-Profile
Table 5 – Service and protocols for SV communication A-Profile
Replace existing Table 5 with the following new Table 5:
OSI model Specification m/o
layer
Name Service specification Protocol specification
Application SendMSVMessage service See clause 8.5 m
Security IEC 62351-6 o
Presentation Abstract syntax ISO/IEC 8824-1:2008 ISO/IEC 8825-1 m
Session
Remove the third paragraph of Subclause 5.3.2.
5.3.3 T-Profile

Add a new heading 5.3.3.1 General before the first paragraph and renumber subsequent

subclauses accordingly.
Table 6 – SV T-Profile
Replace existing Table 6 with the following new Table 6:
---------------------- Page: 6 ----------------------
IEC 61850-9-2:2011/AMD1:2020 – 5 –
© IEC 2020
Specification
OSI model
m/o
Name Service specification Protocol
layer
specification
Transport
Network
Link Parallel redundancy protocol and IEC 62439-3:2016 o
Redundancy high availability seamless ring
DataLink Priority tagging/VLAN IEEE 802.1Q m
Standard for Ethernet ISO/IEC/IEEE 8802-3 m
Physical Interface IEC TR 61850-90-4 c

c If the product standard profiling this standard is not specifying another physical interface, IEC/TR 61850-90-4

applies
Add the following new note after Table 6:

NOTE This document only considers layer 2 sampled values transmission. Routable sampled values mechanisms

are defined in IEC 61850-8-1.
5.3.3.2 Physical layer: Specifications for the medium attachment unit (MAU)
Remove existing Subclause 5.3.3.2 (formerly 5.3.3.1).
5.3.3.2 Link layer: Ethernet addresses

Replace the reference to ISO/IEC 8802-3 multicast/unicast address with ISO/IEC/IEEE 8802-3

multicast.
5.3.3.3 Link layer: Priority tagging/virtual LAN
Replace the existing text of Subclause 5.3.3.3 with the following new text:
IEEE 802.1Q field shall be present in the egress frames from a SV publisher.

Priority tagging according to IEEE 802.1Q is used to separate time-critical and high-priority

bus traffic for protection-relevant applications from low priority bus loads.

Subscribers conformant to this document shall be prepared that the Virtual LAN tag might

have been removed or modified by the network on the path from the publisher to the subscriber.

See Figure 2 for the structure of the tag header.
Octets 8 7 6 5 4 3 2 1
TPID
0 × 8100 (as per 802.1Q)
2 User priority CFI VID
TCI
3 VID
Figure 2 – Structure of the tag header
---------------------- Page: 7 ----------------------
– 6 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020

TPID (tag protocol identifier) field: indicates the Ethernet type assigned for 802.1Q Ethernet

encoded frames. This value shall be 0x8100.

TCI (tag control information) fields: user priority: BS3; user priority value shall be set by

configuration to separate sampled values from low priority bus load. If the priority is not

configured, then the default values of Table 4 shall be used.

CFI (canonical format indicator): BS1 [0]; a single bit flag value. For this standard, the CFI bit

value shall be reset (value = 0).

NOTE If set (value = 1), an embedded resource identification field (E-RIF) follows the Length/Type field in the

ISO/IEC/IEEE 8802-3 tagged frame.

VID: for backward compatibility reasons, the value of the VLAN Identifier shall be zero (0) if

the SMV P-Type VLAN-ID is missing in the configuration.

As IEEE 802.1Q allows implementation with a restricted set of priorities, the higher priority

frames should have a priority of 4 to 7 and the lower priority should have a priority of 1 to 3.

The value 1 is the priority of untagged frames; thus 0 should be avoided as it may cause

unpredictable delay due to normal traffic.

Additionally, since sampled values potentially need to have their own bandwidth allocation,

their configured VID will be different from GOOSE.
The default values for priority and VID shall be as defined in Table 7.
Table 7 – Default Virtual LAN IDs and priorities
Service Default VID Default priority
Sampled Values 0 4

The general ISO/IEC 8802-3 frame structure for sampled values can be found in Annex A.

All implementations that send Sampled Values and claim conformance to this clause of this

standard, shall be capable of configuration of the VID and priority attributes.

All implementations that receive Sampled Values shall be capable of receiving any VID and

priority (e.g. these attributes shall not be used for Source address matching). Additionally,

such implementations shall be capable of processing incoming messages that do not contain

IEEE 802.1Q information.
5.3.3.4 Link layer: Ethertype and other header information
5.3.3.4.1 Ethertype
Replace the reference to ISO/IEC 8802-3 with ISO/IEC/IEEE 8802-3.
5.3.3.4.2 APPID
Replace the reference to ISO/IEC 8802-3 with ISO/IEC/IEEE 8802-3.
---------------------- Page: 8 ----------------------
IEC 61850-9-2:2011/AMD1:2020 – 7 –
© IEC 2020
5.3.3.4.5 Reserved 2
Replace the reference to IEC/TS 62351-6 with IEC 62351-6.
Add the following new text at the end of Subclause 5.3.3.4.5:

Subscribers that do not support IEC 62351-6 shall ignore the value of the fields when it is not

8 Mapping of the model for the transmission of sampled values
8.1 Overview

Remove, in the second paragraph of Subclause 8.1, the text "for unicast and multicast".

8.2 Mapping of the multicast sampled value control block class and services
8.2.1 Multicast sampled value control block definition
Table 9 – MMS TypeDescription definition for MSVCB MMS structure
Replace existing Table 9 with the following new Table 9:
MMS component MMS Condi-
r/w m/o Comments
name TypeDescription tion
MsvCBNam Identifier r m MMS Identifier of the structure of the
MsvCBName within the MMS object named:
LLN0$MS e.g. LLN0$MS$
MsvCBRef Visible-string r m
The value of this component shall contain
the IEC Reference of the MsvCB.
e.g.
/LLN0$MS$
SvEna Boolean r/w m TRUE = transmission of sampled value
buffer is activated.
FALSE = transmission of sampled value
buffer is deactivated.
MsvID Visible-string r m System-wide unique identification.
It is strongly recommended to use a four-
byte hexadecimal representation of APPID
value as system-wide unique identification
DatSet Visible-string r m The value of this component shall contain
the IEC reference of the DataSet conveyed
by the MsvCB. This ObjectReference shall
be limited to VMD or Domain scoped
NamedVariableLists.
Only FCDA of Basic Types are allowed to be
members of the DataSet.
ConfRev Unsigned integer r m Count of configuration changes regard to
MSVCB.
SmpRate Unsigned integer r m Amount of samples (default per nominal
period, see SmpMod).
OptFlds Bitstring See Table 20
refresh-time Boolean r m TRUE = SV buffer contains the attribute
“RefrTm”.
FALSE = attribute “RefrTm” is not available
in the SV buffer.
sample- Boolean r m Value will be ignored. Kept to ensure
synchronised backward compatibility with IEC 61850-9-
2:2004
---------------------- Page: 9 ----------------------
– 8 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
MMS component MMS Condi-
r/w m/o Comments
name TypeDescription tion
sample-rate Boolean r m TRUE = SV buffer contains the attribute
“SmpRate”.
FALSE = attribute “SmpRate” is not available
in the SV buffer.
data-set-name Boolean r m TRUE = SV buffer contains the attribute
“DatSet”.
FALSE = attribute “DatSet” is not available
in the SV buffer.
security Boolean r m Mapping specific attribute.
TRUE = SV buffer contains the attribute
“Security”.
FALSE = attribute “Security” is not available
in the SV buffer.
sample-mode Boolean r m TRUE = SV buffer contains the attribute
“SmpMod”.
FALSE = attribute “SmpMod” is not available
in the SV buffer.
synch-source- Boolean r m TRUE = SV buffer contains the attribute
identity “GmIdentity”.
FALSE = attribute “GmIdentity” is not
available in the SV buffer.
SmpMod Enumerated r m smpMod specifies
0 = samples per nominal period (DEFAULT)
1 = samples per second
2 = seconds per sample
If not available (backward compatibility) the
default value is 0.
DstAddress PhyComAddr m Mapping specific attribute. See Table 10
noASDU Unsigned integer r m Mapping specific attribute.
Number of ASDU concatenated into one
APDU.
Replace existing Table 10 by the following new Table 10:
Table 10 – PhyComAddr structure
MMS component MMS Condi-
r/w m/o Comments
name TypeDescription tion
Addr OCTET-STRING r m Length is 6 octets and contains the value of
the destination media access control (MAC)
address to which the SV message is to be
sent.
The DstAddress shall be an Ethernet
address that has the multicast bit set to
TRUE. In order to facilitate the network
traffic filtering, it is recommended to use
different Ethernet addresses for each
DstAddress.
See Annex B for multicast addressing
recommendations
PRIORITY Unsigned8 r m Range of values shall be limited from 0 to 7.
VID Unsigned16 r/w m Range of values shall be limited from 0 to
4 095.
APPID Unsigned16 r m As defined in 5.3.3.
---------------------- Page: 10 ----------------------
IEC 61850-9-2:2011/AMD1:2020 – 9 –
© IEC 2020
Add, after Table 10, the following new Table 20:
Table 20 – Mapping of OptFlds within Bitstring
MMS component name Bitstring bit position
refresh-time 0
sample-synchronised 1
sample-rate 2
data-set-name 3
security 4
sample-mode 5
synch-source-identity 6
8.2.2 MSV Services
Table 11 – Mapping of multicast sampled value services
Replace existing Table 11 with the following new Table 11:
Service
Services of MSVCB Class
Transmission of MSV messages is mapped directly on
SendMSVMessage
data link layer as defined in 8.4 and 8.5
Mapped to MMS read service
GetMSVCBValue
Mapped to MMS write service
SetMSVCBValue
GetMsvReference Mapped to Management service
GetMSVElementNumber
8.3 Mapping of the unicast sampled value control block class and services
Replace the existing text of Subclause 8.3 with the following new text:
The usage of unicast sampled values frames has been deprecated.
8.4 Mapping of the update of the sampled value buffer

Replace, in the second paragraph of Subclause 84, the reference to ISO/IEC 8802-3 with

ISO/IEC/IEEE 8802-3.
8.5 Additional definitions for the transmission of sampled values
8.5.2 Presentation layer functionality
Table 14 – Encoding for the transmission of the sampled value buffer
Replace existing Table 14 with the following new Table 14:
---------------------- Page: 11 ----------------------
– 10 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
IEC61850 DEFINITIONS::= BEGIN
IMPORTS Data FROM ISO-IEC-9506-2
IEC 61850-9-2 Specific Protocol::= CHOICE {
savPdu [APPLICATION 0] IMPLICIT SavPdu,
Abstract buffer format Coding in IEC 61850-9-2 Comments
according to IEC 61850-7-2
Attribute name Attribute type ASN.1 basic encoding rules (BER)
SavPdu::=
SEQUENCE {
noASDU [0] IMPLICIT INTEGER Mapping specific attribute.
(1..65535),
Number of ASDUs, which will be
concatenated into one APDU.
security [1] ANY OPTIONAL, Mapping specific attribute.
Reserved for future definition (e.g.
digital signature).
asdu [2] IMPLICIT SEQUENCE OF 1 to n number of ASDUs as
ASDU specified before.
ASDU::=
SEQUENCE {

MsvID VisString129 svID [0] IMPLICIT VisibleString, Should be a system-wide unique

identification.
It is strongly recommended to use a
four bytes hexadecimal
representation of APPID value as
this system-wide unique
identification
DatSet ObjectReference datset [1] IMPLICIT VisibleString Value from the MSVCB
OPTIONAL,
If MsvID allows to have a unique
identification of the stream over the
subnetwork, it is not recommended
to include this field
SmpCnt INT16U smpCnt [2] IMPLICIT OCTET STRING Will be incremented each time a
(SIZE(2)), new sampled value is taken.
The domain shall define how the
counter shall be used. For instance,
IEC 61869-9 defines it for time
alignment: the counter shall be set
to zero when the synchronization
occurs.
The OCTET STRING is interpreted
as INT16U as defined in Table 15.
Rollover may occur.
ConfRev INT32U confRev [3] IMPLICIT OCTET STRING Value from the MSVCB.
(SIZE(4)),
The OCTET STRING is interpreted
as INT32U as defined in Table 15.
RefrTm Timestamp refrTm [4] IMPLICIT UtcTime Time when the transmission buffer
OPTIONAL, has been refreshed locally. This is
the time of the physical event
corresponding to the SV transmitted
in this ASDU
SmpSynch INT8U smpSynch [5] IMPLICIT OCTET Refer to Synchronization clause for
STRING (SIZE(1)), details
---------------------- Page: 12 ----------------------
IEC 61850-9-2:2011/AMD1:2020 – 11 –
© IEC 2020
Abstract buffer format Coding in IEC 61850-9-2 Comments
according to IEC 61850-7-2
SmpRate INT16U smpRate [6] IMPLICIT OCTET Value from the MSVCB.
STRING (SIZE(2)) OPTIONAL,
The OCTET STRING is interpreted
as INT16U as defined in Table 15.

Sample [1..n] Type depends on sample [7] IMPLICIT OCTET STRING List of data values related to the

the CDC defined in (SIZE(n)), data set definition.
IEC 61850-7-3.
For the encoding of the Data, the
rules for the encoding of the basic
data types shall apply as defined in
8.6.
Only FCDA of Basic Type are
allowed to be members of the data
set.
The SIZE (n) is the cumulated size
of all the data conveyed as defined
in the DataSet.
SmpMod INT16U smpMod [8] IMPLICIT OCTET STRING Value from the MSVCB.
(SIZE(2)) OPTIONAL
The OCTET STRING is interpreted
, as INT16U as defined in Table 15.

SynchSrcID Ident8 gmIdentity [9] IMPLICIT OCTET Refer to Synchronization clause for

STRING (SIZE(8)) OPTIONAL details

NOTE The usage of the OptFlds attribute according to IEC 61850-7-2 is not necessary, because the relating

attributes RefrTm, security, SmpRate, SmpMod, SynchSrcID and DatSet will be signed as optional via the ASN.1

attribute directly.
... }
END
8.6 Definitions for basic data types – Presentation layer functionality
Replace the existing text of Subclause 8.6 with the following new text:

Table 15 shows the encoding for the basic data types used for the data values referenced by

the data set members.

As an exception of the BITSTRING encoding shown in Table 15, for backward compatibility

with existing implementations of the standard, Table 21 defines a specific mapping for

IEC 61850-7-2 quality.
---------------------- Page: 13 ----------------------
– 12 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
Table 15 – Encoding for the basic data types
Data types according to Encoding in data set Comments
IEC 61850-7-2
BOOLEAN 8-bit set to 0 FALSE; anything else = TRUE
INT8 8-bit big-endian Signed
INT16 16-bit big-endian Signed
INT32 32-bit big-endian Signed
INT64 64-bit big-endian Signed
INT8U 8-bit big-endian Unsigned
INT16U 16-bit big-endian Unsigned
INT32U 32-bit big-endian Unsigned
FLOAT32 32-bit IEEE Floating Point (IEEE 754)
ENUMERATED 32-bit big-endian Signed
CODED ENUM 32-bit big-endian
OCTET STRING 20 -byte ASCII text, null terminated
VISIBLE STRING 35 -byte ASCII text, null terminated
UNICODE STRING 20 -byte, null terminated
ObjectName 20 -byte ASCII text, null terminated
ObjectReference 20 -byte ASCII text, null terminated
Timestamp 64-bit timestamp as defined in IEC 61850-8-1
EntryTime 48-bit timestamp as defined in IEC 61850-8-1
EntryID 8 bytes
Currency 4-byte ASCII text, null terminated (ISO 4217)
Data types according to Encoding in data set Comments
IEC 61850-8-1
BITSTRING
32-bit – Bit 0 shall be the leftmost (most
significant) bit of the first transmitted octet. Bit
7 shall be the rightmost (least significant) bit of
the first transmitted octet. Bit 8 shall be the
leftmost (most significant) bit of the second
octet. Bit 15 shall be the rightmost (least
significant) bit of the second octet. This shall be
continued in that way in further octets.
---------------------- Page: 14 ----------------------
IEC 61850-9-2:2011/AMD1:2020 – 13 –
© IEC 2020
Table 21 – Mapping for IEC 61850-7-2 quality
Bit number IEC 61850-7-2 Bit-String
Attribute name Attribute value Value Default
31-30 Validity Good 0 0 0 0
Invalid 0 1
Invalid 1 0
Questionable 1 1
29 Overflow TRUE FALSE
28 OutofRange TRUE FALSE
27 BadReference TRUE FALSE
26 Oscillatory TRUE FALSE
25 Failure TRUE FALSE
24 OldData TRUE FALSE
23 Inconsistent TRUE FALSE
22 Inaccurate TRUE FALSE
21 Source Process 0 0
Substituted 1
20 Test TRUE FALSE
19 OperatorBlocked TRUE FALSE
The reserved value has been redefined to "invalid" for backward compatibility.

A value quality with a validity = Invalid, Failure = TRUE and Test = TRUE corresponds to a

0x0842.
Add the following new Clause 9 and renumber subsequent clauses accordingly:
9 Synchronization

When several sampled values publishers are used by an application, they all shall be

synchronized to a common time reference to have their sampling synchronized. Different

methods exist to synchronize IEDs, such as using a 1PPS optical signal from a GPS clock,

but the recommended one is using the Precision Time Protocol over Ethernet specified in

IEC 61588:2009.

When IEC 61588:2009 synchronization protocol (PTP) is used to synchronize a sampled

values publisher, all PTP compatible devices within the system shall comply with IEC/IEEE

61850-9-3.

A synchronized sampled values publisher shall fill SmpCnt, SmpSynch and optionally fields

RefrTm and gmIdentity as specified in Table 14.

The required synchronization accuracy of SV during normal operation or in case of clock

failure or repair, as well as the specific resetting event for SmpCnt, is out of scope for this

standard; relevant standards such as IEC 61869-9 for digital instrument transformers apply.

A sampled values publisher shall fill the SmpSynch field of SV messages as follows:

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– 14 – IEC 61850-9-2:2011/AMD1:2020
© IEC 2020
Synchronization device (3)
synchronized to the required
accuracy (1) to a global time Synchronization device (3)
reference. not synchronized to the
For instance, a GPS clock required accuracy (1) to a
receiving the GPS signal or global time reference. (2)
not receiving the GPS signal
but still in holdover mode. (2)
Sampled values publisher
synchronized to the required
accuracy (1) to the
SmpSync = 2 SmpSync = 1
synchronization device.
For instance a sampled values
(global synchronization) (local synchronization)
publisher receiving clock signal
or not receiving clock signal but
still in holdover mode
Sampled values publisher not
SmpSync = 0 SmpSync = 0
synchronized to the required
accuracy (1) to the
(internally synchronized) (internally synchronized)
synchronization device.

NOTE 1 The required accuracy depends on the application and the kind of sampled values transported. The

accuracy requirements from the application / product standard should apply.

NOTE 2 The way the sampled values publisher knows if the synchronizing device is synchronized to the required

accuracy to a global time reference is out of scope for this standard.

The recommended method is using the IEC/IEEE 61850-9-3 for synchronization and quality information sent by the

grandmaster clock. For instance, having time traceable flag set to true and a clockClass of 6 for SmpSync = 2.

NOTE 3 "Synchronization device" could be any device used to synchronize a sampled values publisher, for

instance a PTP grandmaster clock, Caesium clock, GPS clock etc.
Other values are reserved and shall not be used for SmpSynch.

When PTP is used to synchronize a sampled values publisher, the use of the optional field

gmIdentity is strongly recommended to indicate the identity of the grandmaster clock actually

synchronizing the device. The value of gmIdentity shall be the network order of the bytes

representing grandmasterIdentity according to 13.5 of IEC 61588:2009.

If SmpSynch = 0 or when PTP is not used to synchronize a sampled values publisher, the

information in the gmIdentity field is ir
...

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