I n t e r n a t i o n a l
ITU-T
T e l e c o m m u n i c a t i o n
U n i o n
G.8031/Y.1342
TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU
Corrigendum 1
(09/2010)
SERIES G: TRANSMISSION SYSTEMS AND MEDIA,
DIGITAL SYSTEMS AND NETWORKS
Packet over Transport aspects – Ethernet over Transport
aspects
SERIES Y: GLOBAL INFORMATION
INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS
AND NEXT-GENERATION NETWORKS
Internet protocol aspects – Transport
Ethernet linear protection switching
Corrigendum 1
Recommendation ITU-T G.8031/Y.1342 (2009) –
Corrigendum 1
ITU-T G-SERIES RECOMMENDATIONS
TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS
GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIERTRANSMISSION SYSTEMS
INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE
SYSTEMS ON METALLIC LINES
GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS
ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC
LINES
COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY
TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS
DIGITAL TERMINAL EQUIPMENTS
DIGITAL NETWORKS
DIGITAL SECTIONS AND DIGITAL LINE SYSTEM
MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE – GENERIC AND USERRELATED ASPECTS
TRANSMISSION MEDIA CHARACTERISTICS
DATA OVER TRANSPORT – GENERIC ASPECTS
PACKET OVER TRANSPORT ASPECTS
Ethernet over Transport aspects
MPLS over Transport aspects
Quality and availability targets
Service Management
ACCESS NETWORKS
For further details, please refer to the list of ITU-T Recommendations.
G.100–G.199
G.200–G.299
G.300–G.399
G.400–G.449
G.450–G.499
G.600–G.699
G.700–G.799
G.800–G.899
G.900–G.999
G.1000–G.1999
G.6000–G.6999
G.7000–G.7999
G.8000–G.8999
G.8000–G.8099
G.8100–G.8199
G.8200–G.8299
G.8600–G.8699
G.9000–G.9999
Recommendation ITU-T G.8031/Y.1342
Ethernet linear protection switching
Corrigendum 1
Summary
Corrigendum 1 to Recommendation ITU-T G.8031/Y.1342 clarifies clause 11.1 (APS format),
clause 11.2.1 (Principle of operation), clause 11.10 (Equal priority requests), clause 11.15 (Failure of
protocol defects), Annex A (State transition tables of protection switching), and Appendix IV (State
transition diagrams using SDL).
History
Edition Recommendation
Approval
Study Group
2006-06-06
15
1.1
ITU-T G.8031/Y.1342 (2006) Amend. 1 2007-10-07
15
1.2
ITU-T G.8031/Y.1342 (2006) Cor. 1
2008-06-06
15
2009-11-13
15
2010-09-06
15
1.0
2.0
2.1
ITU-T G.8031/Y.1342
ITU-T G.8031/Y.1342
ITU-T G.8031/Y.1342 (2009) Cor. 1
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
i
FOREWORD
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telecommunications, information and communication technologies (ICTs). The ITU Telecommunication
Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical,
operating and tariff questions and issuing Recommendations on them with a view to standardizing
telecommunications on a worldwide basis.
The World Telecommunication Standardization Assembly (WTSA), which meets every four years,
establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on
these topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.
In some areas of information technology which fall within ITU-T's purview, the necessary standards are
prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a
telecommunication administration and a recognized operating agency.
Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the
Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some
other obligatory language such as "must" and the negative equivalents are used to express requirements. The
use of such words does not suggest that compliance with the Recommendation is required of any party.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may
involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence,
validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others
outside of the Recommendation development process.
As of the date of approval of this Recommendation, ITU had received notice of intellectual property,
protected by patents, which may be required to implement this Recommendation. However, implementers
are cautioned that this may not represent the latest information and are therefore strongly urged to consult the
TSB patent database at http://www.itu.int/ITU-T/ipr/.
 ITU 2011
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the
prior written permission of ITU.
ii
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
CONTENTS
Page
1)
Scope.............................................................................................................................
1
2)
References.....................................................................................................................
1
3)
Changes to Recommendation ITU-T G.8031/Y.1342 ..................................................
3.1)
Clause 11.1, APS format ................................................................................
3.2)
Figure 11-3 .....................................................................................................
3.3)
Clause 11.2.1, Principle of operation .............................................................
3.4)
Clause 11.10, Equal priority requests .............................................................
3.5)
Clause 11.15, Failure of protocol defects .......................................................
3.6)
Clause A.1.2, Far-end requests .......................................................................
3.7)
Clause A.3.2, Far-end requests .......................................................................
3.8)
Clause A.2.1, Local requests ..........................................................................
3.9)
Clause A.2.2, Far-end requests .......................................................................
3.10) Clause A.4.1, Local requests ..........................................................................
3.11) Clause A.4.2, Far-end requests .......................................................................
3.12) Clause A.6.1, Local Requests .........................................................................
3.13) Figure IV.1 .....................................................................................................
3.14) Figure IV.4 .....................................................................................................
3.15) Figure IV.8 .....................................................................................................
3.16) Figure IV.9 .....................................................................................................
3.17) Figure IV.10 ...................................................................................................
3.18) Figure IV.12 ...................................................................................................
3.19) Figure IV.13 ...................................................................................................
3.20) Figure IV.14 ...................................................................................................
3.21) Figure IV.15 ...................................................................................................
3.22) Figure IV.16 ...................................................................................................
3.23) Figure IV.18 ...................................................................................................
3.24) Figure IV.21 ...................................................................................................
3.25) Figure IV.22 ...................................................................................................
3.26) Figure IV.23 ...................................................................................................
3.27) Figure IV.24 ...................................................................................................
3.28) Figure IV.26 ...................................................................................................
3.29) Figure IV.28 ...................................................................................................
3.30) Figure IV.35 ...................................................................................................
3.31) Title of Figure IV.37.......................................................................................
1
1
1
1
2
3
4
4
5
5
5
6
6
7
8
9
10
11
12
13
14
16
17
19
20
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22
23
24
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Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
iii
Recommendation ITU-T G.8031/Y.1342
Ethernet linear protection switching
Corrigendum 1
1)
Scope
This corrigendum contains material to correct Recommendation ITU-T G.8031/Y.1342, Ethernet
linear protection switching.
2)
References
Add the following reference:
–
Recommendation ITU-T G.8031/Y.1342 (2009), Ethernet linear protection switching.
3)
Changes to Recommendation ITU-T G.8031/Y.1342
The following subclauses contain changes to be made to Recommendation ITU-T G.8031/Y.1342.
3.1)
Clause 11.1, APS format
In Table 11-1, to the right of "Request/State",
Replace:
0110
Manual switch to working (MS-W)
0110
Deprecated
By:
3.2)
Figure 11-3
On the transition between the Validity check logic and the Mismatch detection logic,
Replace:
"Requested signal" and "bridged signal" far end status
By:
"Requested signal" far end status
3.3)
Clause 11.2.1, Principle of operation
Replace:
The "global priority logic" compares the top priority local request with the request of the last
received "request/state" information (according to the order of priority of Table 11-1) to determine
the top priority global request. In the global priority logic, a state transition by one of three local
requests, CLEAR command, clearance of SF(-P) and expiration of WTR timer, shall be calculated
first, then further state transitions by the last received far-end request shall be calculated.
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
1
By:
The state transitions and the top priority global request are calculated in the "global priority logic"
based on the top priority local request, the request of the last received "Request/State" information,
and state transition tables defined in Annex A, as follows:
a)
If the top priority local request is CLEAR, or clearance of SF(-P), or expiration of WTR, a
state transition is calculated first based on the top priority local request and state machine
table for local requests to obtain an intermediate state. Then, starting at this intermediate
state, the last received far end request and the state machine table for far end requests are
used to calculate the final state.
b)
If the top priority local request is neither CLEAR, nor clearance of SF(-P), nor expiration of
WTR, the "global priority logic" compares the top priority local request with the request of
the last received "Request/State" information based on Table 11-1.
i) If the top priority local request has higher or equal priority, it is used with the state
transition table for local requests defined in Annex A to determine the final state;
otherwise
ii) The request of the last received "Request/State" information is used with the state
transition table for far end requests defined in Annex A to determine the final state.
The final state corresponds to the "top priority global request".
Delete:
As described above, state transitions of a protection switching process are calculated within the
"global priority logic". All state transitions caused by a top priority global request are defined in
Annex A.
Replace:
The bridge/selector status is transmitted to the far end via the "request signal" and "bridged signal"
(with coding as described in Table 11-1). It is also compared with the bridge/selector status of the
far end as indicated by the received "request signal" and "bridged signal".
By:
The bridge/selector status is transmitted to the far end via the "Requested Signal" and "Bridged
Signal" (with coding as described in Table 11-1). It is also compared with the bridge/selector status
of the far end as indicated by the received "Requested Signal" and "Bridged Signal".
3.4)
Clause 11.10, Equal priority requests
In the last bullet item,
Replace:
Note that MS with the requested signal number 1 and 0 have different priorities.
By:
Note in case MS is issued simultaneously either as local or far end requests to both working and
protection transport entities, MS to the working transport entity is considered as having higher
priority than MS to the protection transport entity.
2
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
3.5)
Clause 11.15, Failure of protocol defects
In the third bullet item,
Replace:
–
Lack of response to a bridge request (i.e., no match in sent "requested signal" and received
"requested signal") for > 50 ms.
By:
–
Lack of response to a bridge request (i.e., no match in sent "Requested Signal" and received
"Requested Signal") in case of bidirectional switching for > 50 ms.
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
3
3.6)
Clause A.1.2, Far-end requests
In Table A.2,
Replace:
A
No Request
Working/Active
Protection/Standby
NR
[r/b=null]
(A)
(A)
B
B
B



N/A
M
(A)
(A)
or Ea)
or Fb)
(A)
(A)
(A)
or Ea)
or Fb)
(A)
(A)
(A)
or Ea)
or Fb)
(A)
(A)
(A)
or Ea)
or Fb)
(A)

By:
A
3.7)
No Request
Working/Active
Protection/Standby
NR
[r/b=null]
(A)
(A)
B
B
B



B
B
B



B
B
B



B
M

Clause A.3.2, Far-end requests
In Table A.6,
Replace:
A
No Request
Working/Active
Protection/Standby
NR
[r=null,
b=normal]
(A)
No Request
Working/Active
Protection/Standby
NR
[r=null,
b=normal]
(A)
(A)
N/A
M

By:
A
4
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
(A)
B
M

3.8)
Clause A.2.1, Local requests
In Table A.3,
Replace:
H
Manual Switch
Working/Active
Protection/Standby
MS
[r/b=null]
C
D
E
N/A
F
N/A
G
O
A
O
H
Manual Switch
Working/Active
Protection/Standby
MS
[r/b=null]
C
D
E
N/A
F
N/A
O
O
A
O
By:
3.9)
Clause A.2.2, Far-end requests
In Table A.4,
Replace:
H
Manual Switch
Working/Active
Protection/Standby
MS
[r/b=null]
H
Manual Switch
Working/Active
Protection/Standby
MS
[r/b=null]
A
A
B
B
B
(H)
O
O
O
O
O
O
O
O
O
O
By:
3.10)
A
A
B
B
O
(H)
O
O
O
O
O
O
Clause A.4.1, Local requests
In Table A.7,
Replace:
H
5
Manual Switch
Working/Active
Protection/Standby
MS
[r=null,
b=normal]
C

Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
D

E

N/A
F

N/A
G
O
A

O
By:
H
3.11)
Manual Switch
Working/Active
Protection/Standby
C

MS
[r=null,
b=normal]
D

E

F

N/A
N/A
O
A

O
O
Clause A.4.2, Far-end requests
In Table A.8,
Replace:
H
Manual Switch
Working/Active
Protection/Standby
MS
[ r= null,
b=normal]
A
A
B
B




Manual Switch
Working/Active
Protection/Standby
MS
[ r= null,
b=normal]
A
A
B
B




B
(H)
O
O
O
O
O
O
O
O
O
(H)
O
O
O
O
O
O
O
O
G
O
By:
H
3.12)
Clause A.6.1, Local Requests
In Table A.10,
Replace:
H
Manual Switch
Working/Active
Protection/Standby
C
D
E



Manual Switch
Working/Active
Protection/Standby
C
D
E



N/A
F
N/A

A
N/A

By:
H
6
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
N/A
F

N/A
O
O
A

N/A
3.13)
Figure IV.1
Replace Figure IV.1:
A
NR
Only for
Non-revertive
mode
No Request
W=act P=stb
null
null
SF-W
SF-P
LO
Switch to
protection
FS
MS
Switch to
protection
Switch to
protection
MS-W
EXER
SF
SF-P
LO
FS
MS
MS
r=null
b=null
EXER
r=null
b=null
E
F
C
D
G
H
K
LO
SF-P
FS
A
SF
MS
MS
r=null
b=null
WTR
Switch to
protection
Switch to
protection
NR
r=normal
b=normal
NR
r=normal
b=normal
B
B
EXER
r=null
b=null
RR
r=null
b=null
NR
r=normal
b=normal
RR
r=null
b=null
NR
r=null
b=null
No
local SF-W
detect?
SF-P
M
A
A
By:
A
NR
Only for
Non-revertive
mode
No Request
W=act P=stb
null
null
SF-W
SF-P
LO
Switch to
protection
FS
MS
Switch to
protection
Switch to
protection
MS-W
EXER
SF
SF-P
LO
FS
MS
MS
r/b=null
EXER
r/b=null
E
F
C
D
G
H
K
LO
SF-P
A
FS
SF
MS
WTR
Switch to
protection
Switch to
protection
NR
r/b=
normal
NR
r/b=
normal
B
B
MS
r/b=null
EXER
r/b=null
NR
r/b=
normal
RR
r/b=null
RR
r/b=null
NR
r/b=null
No
local SF-W
detect?
SF-P
A
M
A
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
7
3.14)
Figure IV.4
Replace Figure IV.4:
D
Only for
revertive
mode
FS
Forced Switch
Only for
Non-revertive
mode
W=stb P=act
normal
normal
Working
recovers
from SF
SF-W
SF-P
LO
Switch to
working
Switch to
working
SF-P
LO
F
C
FS
MS
MS-W
EXER
No
Yes
D
CLEAR
D
Revertive
Mode?
SF-W
local
detect?
No
SF
DNR
r/b=
null
Switch to
working
NR
r/b=
null
E
J
A
LO
SF-P
FS
SF
MS
MS
r/b=
null
EXER
r/b=
null
WTR
Switch to
working
EXER
r/b=
normal
RR
r/b=
null
RR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
D
NR
r/b=
null
A
By:
D
Only for
revertive
mode
FS
Forced Switch
Only for
Non-revertive
mode
W=stb P=act
normal
SF-W
normal
Working
recovers
from SF
SF-P
LO
Switch to
working
Switch to
working
SF-P
LO
F
C
FS
MS
MS-W
EXER
No
Yes
D
CLEAR
D
Revertive
Mode?
local
detect?
SF-W
No
SF
DNR
r/b=
normal
Switch to
working
NR
r/b=
null
E
J
A
LO
SF-P
Switch to
working
FS
SF
MS
MS
r/b=
null
WTR
EXER
r/b=
null
EXER
r/b=
normal
D
NR
r/b=
null
A
8
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
RR
r/b=
null
RR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
3.15)
Figure IV.8
Replace Figure IV.8:
H
MS
Only for
Non-revertive
mode
Manual Switch
W=act P=stb
null
null
SF
SF-P
LO
Switch to
protection
LO
FS
MS
Switch to
protection
Switch to
protection
MS-W
EXER
NR
r/b=
null
SF
SF-P
LO
FS
MS
E
F
C
D
G
H
EXER
r/b=
null
EXER
r/b=
normal
RR
r/b=
null
MS-W
EXER
SF-P
FS
NR
r/b=
null
Switch to
protection
A
NR
r/b=
normal
SF
MS
r/b=
null
MS
WTR
CLEAR
A
RR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
H
B
By:
H
MS
Only for
Non-revertive
mode
Manual Switch
W=act P=stb
null
null
SF
SF-P
LO
FS
Switch to
protection
LO
SF-P
SF-P
LO
FS
E
F
C
D
NR
r/b=
null
Switch to
protection
A
NR
r/b=
normal
CLEAR
Switch to
protection
SF
FS
MS
SF
MS
MS
r/b=
null
NR
r/b=
null
A
H
WT
R
EXER
r/b=
null
EXER
r/b=
normal
RR
r/b=
null
RR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
H
B
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
9
3.16)
Figure IV.9
Replace Figure IV.9:
I
WTR
Only for
revertive
mode
Wait To Restore
W=stb P=act
normal
normal
SF
SF-P
LO
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
FS
E
F
C
D
G
LO
SF-P
FS
SF
FS
MS
MS
CLEAR
EXER
WTR
timer
expires
Switch to
working
MS
r/b=
null
WTR
Switch to
working
NR
r/b=
null
I
A
RR
r/b=
null
EXER
r/b=
null
NR
r/b=
normal
I
NR
r/b=
null
NR
r/b=
normal
A
B
By:
I
WTR
Only for
revertive
mode
Wait To Restore
W=stb P=act
normal
normal
SF
SF-P
LO
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
MS
E
F
C
D
G
LO
SF-P
FS
SF
FS
MS
MS
Switch to
working
WTR
Switch to
working
10
NR
r/b=
null
I
EXER
r/b=
null
I
NR
r/b=
null
NR
r/b=
normal
A
B
CLEAR
EXER
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
A
RR
r/b=
null
NR
r/b=
normal
WTR
timer
expires
3.17)
Figure IV.10
Replace Figure IV.10:
J
DNR
Only for
Non-revertive
mode
Do Not Revert
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
MS
MS-W
EXER
r/b=
normal
E
F
C
D
G
H
L
SF-P
MS
r/b=
null
FS
SF
FS
MS
MS-W
EXER
Switch to
working
MS
EXER
r/b=
normal
WTR
RR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
Switch to
working
NR
r/b=
null
NR
r/b=
normal
RR
r/b=
normal
A
B
N
J
By:
J
DNR
Only for
Non-revertive
mode
Do Not Revert
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
MS
MS
r/b=
null
EXER
r/b=
normal
E
F
C
D
G
H
L
SF-P
MS
r/b=
null
FS
SF
FS
MS
MS-W
EXER
Switch to
working
MS
WTR
EXER
r/b=
normal
RR
r/b=
normal
Switch to
working
NR
r/b=
null
NR
r/b=
normal
RR
r/b=
normal
A
B
N
J
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
11
3.18)
Figure IV.12
Replace Figure IV.12:
L
EXER
Only for
Non-revertive
mode
Exercise
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
MS
E
F
C
D
G
SF-P
MS
r/b=
null
FS
FS
MS
MS-W
EXER
CLEAR
MS-W
EXER
r/b=
normal
DNR
r/b=
normal
H
L
J
Switch to
working
SF
MS
EXER
r/b=
normal
WTR
Switch to
working
RR
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
L
NR
r/b=
null
NR
r/b=
normal
A
B
By:
L
EXER
Only for
Non-revertive
mode
Exercise
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
MS
MS
r/b=null
E
F
C
D
G
H
SF-P
MS
r/b=
null
FS
FS
MS
MS-W
SF
MS
WTR
12
EXER
r/b=
normal
L
NR
r/b=
normal
A
B
CLEAR
Switch to
working
Switch to
working
NR
r/b=
null
EXER
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
DNR
r/b=
normal
L
RR
r/b=
normal
J
NR
r/b=
normal
DNR
r/b=
normal
3.19)
Figure IV.13
Replace Figure IV.13:
M
RR
Only for
Non-revertive
mode
Reverse Request
W=act P=stb
null
null
SF
SF-P
LO
Switch to
protection
LO
FS
MS
Switch to
protection
Switch to
protection
MS-W
EXER
SF
SF-P
LO
FS
MS
MS
r/b=
normal
EXER
r/b=
null
E
F
C
D
G
H
K
SF-P
MS
r/b=
null
FS
SF
NR
r/b=
null
Switch to
protection
A
NR
r/b=
normal
MS
WTR
EXER
r/b=
null
RR
r/b=
null
NR
r/b=
null
NR
r/b=
null
M
A
MS-W
EXER
B
By:
M
RR
Only for
Non-revertive
mode
Reverse Request
W=act P=stb
null
null
SF
SF-P
LO
Switch to
protection
LO
FS
MS
Switch to
protection
Switch to
protection
SF
SF-P
LO
FS
MS
MS
r/b=
null
EXER
r/b=
null
E
F
C
D
G
H
K
SF-P
MS
r/b=
null
FS
SF
NR
r/b=
null
Switch to
protection
A
NR
r/b=
normal
MS
WTR
EXER
r/b=
null
RR
r/b=
null
NR
r/b=
null
NR
r/b=
null
M
A
B
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
13
3.20)
Figure IV.14
Replace Figure IV.14:
N
RR
Only for
Non-revertive
mode
Reverse Request
W=stb P=act
normal
normal
SF
LO
SF-P
LO
FS
MS
EXER
Switch to
working
Switch to
working
SF
r/b=
normal
SF-P
r/b=
null
LO
FS
MS
MS-W
EXER
r/b=
normal
E
F
C
D
G
H
L
SF-P
MS
r/b=
null
WTR
EXER
r/b=
normal
RR
r/b=
normal
FS
Switch to
working
SF
MS
Switch to
working
14
MS-W
N
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
A
B
J
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
DNR
r/b=
normal
By:
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
15
3.21)
Figure IV.15
Replace Figure IV.15:
A
NR
Only for
Non-revertive
mode
No Request
W=act P=stb
null
normal
SF-W
SF-P
LO
Switch to
protection
FS
MS
Switch to
protection
Switch to
protection
MS-W
EXER
SF
SF-P
LO
FS
MS
MS-W
EXER
r=null
b=normal
E
F
C
D
G
H
K
LO
SF-P
FS
SF
MS
MS
r=null
b=normal
WTR
Switch to
protection
Switch to
protection
NR
r=normal
b=normal
NR
r=normal
b=normal
B
B
EXER
r=null
b=normal
RR
r=null
b=normal
NR
r=normal
b=normal
RR
r=null
b=normal
NR
r=null
b=normal
No
local SF-W
detect?
SF-P
A
A
M
A
By:
A
NR
Only for
Non-revertive
mode
No Request
W=act P=stb
null
normal
SF-W
SF-P
LO
Switch to
protection
FS
MS
Switch to
protection
Switch to
protection
MS-W
EXER
SF
SF-P
LO
FS
MS
MS
r=null
b=normal
EXER
r=null
b=normal
E
F
C
D
G
H
K
LO
SF-P
FS
SF
MS
WTR
Switch to
protection
Switch to
protection
NR
r/b=
normal
NR
r/b=
normal
B
B
MS
r=null
b=normal
EXER
r=null
b=normal
RR
r=null
b=normal
NR
r/b=
normal
RR
r=null
b=normal
NR
r=null
b=normal
No
local SF-W
detect?
SF-P
A
16
A
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
M
A
3.22)
Figure IV.16
Replace Figure IV.16:
B
NR
Only for
revertive
mode
No Request
W=stb P=act
normal
SF-W
normal
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
E
F
LO
Only for
Non-revertive
mode
SF-P
FS
FS
MS
LO
FS
MS
C
D
G
SF
MS
MS-W
EXER
Working
recovers
from SF
B
B
B
NR
r=normal
b=normal
WTR
Yes
Switch to
working
Previous
local state?
SF
NR
r=null
b=normal
A
WTR
B
B
L
DNR
r=normal
b=normal
Revertive
Mode?
local
detect?
SF-W
No
No
Other
Switch to
working
NR
r=null
b=normal
NR
r=null
b=normal
Switch to
working
DNR
DNR
NR
r=null
b=normal
J
J
A
A
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
17
By:
18
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
3.23)
Figure IV.18
Replace Figure IV.18:
D
FS
Only for
revertive
mode
Forced Switch
W=stb P=act
normal
Only for
Non-revertive
mode
normal
Working
recovers
from SF
SF-W
SF-P
LO
FS
Switch to
working
Switch to
working
MS
MS-W
EXER
No
Yes
D
SF-P
LO
F
C
CLEAR
D
local
detect?
SF-W
No
Revertive
Mode?
SF
DNR
r/b=
null
Switch to
working
NR
r/b=
null
E
J
A
LO
SF-P
FS
SF
MS
MS
r/b=
null
WTR
EXER
r/b=
null
Switch to
working
EXER
r/b=
normal
RR
r/b=
null
RR
r/b=
normal
NR
r/b=
null
NR
r/b=
normal
DNR
r/b=
normal
D
NR
r/b=
null
A
By:
D
FS
Only for
revertive
mode
Forced Switch
W=stb P=act
normal
SF-W
Only for
Non-revertive
mode
normal
Working
recovers
from SF
SF-P
LO
Switch to
working
Switch to
working
SF-P
LO
F
C
FS
MS
MS-W
EXER
No
Yes
D
CLEAR
D
local
detect?
Revertive
Mode?
SF-W
No
SF
DNR
r/b=
normal
Switch to
working
NR
r=null
b=normal
E
J
A
LO
SF-P
Switch to
working
FS
SF
MS
MS
r=null
b=normal
WTR
EXER
r=null
b=normal
EXER
r/b=
normal
RR
r=null
b=normal
RR
r/b=
normal
NR
r=null
b=normal
NR
r/b=
normal
DNR
r/b=
normal
D
NR
r=null
b=normal
A
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
19
3.24)
Figure IV.21
Replace Figure IV.21:
G
MS
Only for
revertive
mode
Manual Switch
W=stb P=act
normal
Only for
Non-revertive
mode
normal
SF
SF-P
LO
FS
Switch to
working
Switch to
working
MS
MS-W
EXER
Yes
SF-P
E
LO
LO
F
SF-P
FS
Switch to
working
NR
r/b=
normal
NR
r=null
b=normal
B
Revertive
Mode?
No
Switch to
working
G
SF
CLEAR
FS
C
D
SF
MS
r=null
b=normal
MS
RR
r=null
b=normal
WTR
RR
r/b=
normal
NR
r=null
b=normal
DNR
r/b=
normal
A
J
EXER
r=null
b=normal
EXER
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
NR
r=null
b=normal
G
A
By:
G
MS
Only for
revertive
mode
Manual Switch
W=stb P=act
normal
Only for
Non-revertive
mode
normal
SF
SF-P
LO
Switch to
working
Switch to
working
FS
MS
MS-W
SF-P
E
LO
Switch to
working
NR
r=null
b=normal
LO
F
SF-P
FS
NR
r/b=
normal
Revertive
Mode?
Switch to
working
NR
r=null
b=normal
DNR
r/b=
normal
A
J
D
MS
RR
r=null
b=normal
MS
r=null
b=normal
RR
r/b=
normal
WTR
NR
r=null
b=normal
EXER
r=null
b=normal
EXER
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
B
G
A
20
No
FS
C
SF
CLEAR
Yes
G
SF
EXER
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
3.25)
Figure IV.22
Replace Figure IV.22:
H
MS
Only for
Non-revertive
mode
Manual Switch
W=act P=stb
null
normal
SF
SF-P
LO
Switch to
protection
LO
FS
MS
Switch to
protection
Switch to
protection
SF
SF-P
LO
FS
MS
E
F
C
D
G
SF-P
FS
SF
NR
r=null
b=normal
Switch to
protection
A
NR
r/b=
normal
MS
r=null
b=normal
MS
RR
r/b=
normal
WTR
NR
r=null
b=normal
MS-W
EXER
CLEAR
NR
r=null
b=normal
A
H
EXER
r=null
b=normal
EXER
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
RR
r=null
b=normal
H
B
By:
H
MS
Only for
Non-revertive
mode
Manual Switch
W=act P=stb
null
normal
SF
SF-P
LO
Switch to
protection
LO
FS
MSW
EXER
CLEAR
Switch to
protection
SF
SF-P
LO
FS
E
F
C
D
SF-P
MS
FS
NR
r=null
b=normal
Switch to
protection
A
NR
r/b=
normal
SF
MS
MS
r=null
b=normal
RR
r/b=
normal
NR
r=null
b=normal
A
H
WTR
NR
r=null
b=normal
EXER
r=null
b=normal
EXER
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
RR
r=null
b=normal
H
B
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
21
3.26)
Figure IV.23
Replace Figure IV.23:
I
WTR
Only for
revertive
mode
Manual Switch
W=stb P=act
normal
normal
SF
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
E
F
C
D
G
LO
SF-P
FS
SF
FS
MS
MS
EXER
CLEAR
WTR
timer
expires
Switch to
working
MS
r=null
b=normal
NR
r=null
b=normal
I
WTR
A
EXER
r=null
b=normal
RR
r=null
b=normal
NR
r/b=
normal
Switch to
working
I
NR
r=null
b=normal
NR
r/b=
normal
A
B
By:
I
WTR
Only for
revertive
mode
Wait To Restore
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
E
F
C
D
G
SF-P
FS
SF
FS
MS
MS
EXER
NR
r=null
b=normal
I
WTR
A
EXER
r=null
b=normal
I
22
NR
r/b=
normal
A
B
WTR
timer
expires
Switch to
working
Switch to
working
NR
r=null
b=normal
CLEAR
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
RR
r=null
b=normal
NR
r/b=
normal
3.27)
Figure IV.24
Replace Figure IV.24:
J
DNR
Only for
Non-revertive
mode
Do Not Revert
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
MS-W
EXER
r/b=
normal
E
F
C
D
G
H
L
SF-P
MS
r=null
b=normal
EXER
r/b=
normal
RR
r/b=
normal
FS
FS
MS
MS-W
EXER
Switch to
working
SF
MS
WTR
NR
r=null
b=normal
NR
r/b=
normal
DNR
r/b=
normal
NR
r=null
b=normal
NR
r/b=
normal
DNR
r/b=
normal
Switch to
working
NR
r=null
b=normal
NR
r/b=
normal
RR
r/b=
normal
A
B
N
J
MS-W
EXER
By:
J
DNR
Only for
Non-revertive
mode
Do Not Revert
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
MS
r=null
b=normal
EXER
r/b=
normal
E
F
C
D
G
H
L
SF-P
MS
r=null
b=normal
EXER
r/b=
normal
RR
r/b=
normal
FS
FS
MS
Switch to
working
SF
MS
WTR
Switch to
working
NR
r=null
b=normal
A
NR
r/b=
normal
RR
r/b=
normal
B
N
J
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
23
3.28)
Figure IV.26
Replace Figure IV.26:
L
EXER
Only for
Non-revertive
mode
Exercise
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
E
F
C
D
G
SF-P
MS
r=null
b=normal
FS
FS
MS
MS-W
EXER
CLEAR
MS-W
EXER
r/b=
normal
DNR
r/b=
normal
H
L
J
Switch to
working
SF
MS
EXER
r/b=
normal
WTR
Switch to
working
RR
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
L
NR
r=null
b=normal
NR
r/b=
normal
A
B
By:
L
EXER
Only for
Non-revertive
mode
Exercise
W=stb P=act
normal
normal
SF
LO
SF-P
LO
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
E
F
C
D
G
SF-P
MS
r=null
b=normal
FS
FS
MS
MS-W
A
24
CLEAR
Switch to
working
SF
MS
DNR
r/b=
normal
MS
r=null
b=normal
H
WTR
Switch to
working
NR
r=null
b=normal
EXER
L
EXER
r/b=
normal
L
NR
r/b=
normal
B
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
J
RR
r/b=
normal
NR
r/b=
normal
DNR
r/b=
normal
3.29)
Figure IV.28
Replace Figure IV.28:
N
RR
Only for
Non-revertive
mode
Reverse Request
W=stb P=act
normal
normal
SF
LO
SF-P
LO
FS
MS
MS-W
EXER
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
MS-W
EXER
r/b=
normal
E
F
C
D
G
H
L
MS
r=null
b=normal
SF-P
FS
Switch to
working
SF
MS
WTR
Switch to
working
EXER
r/b=
normal
RR
r/b=
normal
DNR
r/b=
normal
N
NR
r=null
b=normal
NR
r/b=
normal
DNR
r/b=
normal
A
B
J
By:
N
RR
Only for
Non-revertive
mode
Reverse Request
W=stb P=act
normal
normal
SF
LO
SF-P
LO
FS
MS
MS-W
EXER
Switch to
working
Switch to
working
SF
SF-P
LO
FS
MS
NR
r=null
b=normal
EXER
r/b=
normal
E
F
C
D
G
H
L
SF-P
MS
r=null
b=normal
FS
Switch to
working
Switch to
working
SF
MS
WTR
EXER
r/b=
normal
RR
r/b=
normal
DNR
r/b=
normal
N
NR
r=null
b=normal
NR
r/b=
normal
DNR
r/b=
normal
A
B
J
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
25
3.30)
Figure IV.35
Replace Figure IV.35:
H
Only for
Non-revertive
mode
Manual Switch
W=act P=stb
SF
SF-P
LO
Switch to
protection
E
F
C
FS
MS
Switch to
protection
Switch to
protection
D
G
MS-W
CLEAR
H
A
By:
H
Only for
Non-revertive
mode
Manual Switch
W=act P=stb
SF
SF-P
LO
Switch to
protection
E
3.31)
FS
MS
MS-W
CLEAR
H
A
Switch to
protection
F
C
D
Title of Figure IV.37
Replace the title of Figure IV.37:
Figure IV.37 – DNR(W=act/P=stb) state for 1+1
unidirectional protection switching
By:
Figure IV.37 – DNR(W=stb/P=act) state for 1+1
unidirectional protection switching
26
Rec. ITU-T G.8031/Y.1342 (2009)/Cor.1 (09/2010)
ITU-T Y-SERIES RECOMMENDATIONS
GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXTGENERATION NETWORKS
GLOBAL INFORMATION INFRASTRUCTURE
General
Services, applications and middleware
Network aspects
Interfaces and protocols
Numbering, addressing and naming
Operation, administration and maintenance
Security
Performances
INTERNET PROTOCOL ASPECTS
General
Services and applications
Architecture, access, network capabilities and resource management
Transport
Interworking
Quality of service and network performance
Signalling
Operation, administration and maintenance
Charging
IPTV over NGN
NEXT GENERATION NETWORKS
Frameworks and functional architecture models
Quality of Service and performance
Service aspects: Service capabilities and service architecture
Service aspects: Interoperability of services and networks in NGN
Numbering, naming and addressing
Network management
Network control architectures and protocols
Future networks
Security
Generalized mobility
Carrier grade open environment
For further details, please refer to the list of ITU-T Recommendations.
Y.100–Y.199
Y.200–Y.299
Y.300–Y.399
Y.400–Y.499
Y.500–Y.599
Y.600–Y.699
Y.700–Y.799
Y.800–Y.899
Y.1000–Y.1099
Y.1100–Y.1199
Y.1200–Y.1299
Y.1300–Y.1399
Y.1400–Y.1499
Y.1500–Y.1599
Y.1600–Y.1699
Y.1700–Y.1799
Y.1800–Y.1899
Y.1900–Y.1999
Y.2000–Y.2099
Y.2100–Y.2199
Y.2200–Y.2249
Y.2250–Y.2299
Y.2300–Y.2399
Y.2400–Y.2499
Y.2500–Y.2599
Y.2600–Y.2699
Y.2700–Y.2799
Y.2800–Y.2899
Y.2900–Y.2999
SERIES OF ITU-T RECOMMENDATIONS
Series A
Organization of the work of ITU-T
Series D
General tariff principles
Series E
Overall network operation, telephone service, service operation and human factors
Series F
Non-telephone telecommunication services
Series G
Transmission systems and media, digital systems and networks
Series H
Audiovisual and multimedia systems
Series I
Integrated services digital network
Series J
Cable networks and transmission of television, sound programme and other multimedia signals
Series K
Protection against interference
Series L
Construction, installation and protection of cables and other elements of outside plant
Series M
Telecommunication management, including TMN and network maintenance
Series N
Maintenance: international sound programme and television transmission circuits
Series O
Specifications of measuring equipment
Series P
Terminals and subjective and objective assessment methods
Series Q
Switching and signalling
Series R
Telegraph transmission
Series S
Telegraph services terminal equipment
Series T
Terminals for telematic services
Series U
Telegraph switching
Series V
Data communication over the telephone network
Series X
Data networks, open system communications and security
Series Y
Global information infrastructure, Internet protocol aspects and next-generation
networks
Series Z
Languages and general software aspects for telecommunication systems
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Geneva, 2011