MTP LEVEL 3
TEST NUMBER:	3.2	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Changeover initiated at both ends at the same time (COO <-> COO)			
PURPOSE:	To check the changeover procedure when the changeover is initiated at the both ends simultaneously	
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
		SP		A				SP		B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ------------------>		
	<----------------- 	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ------------------>		
	<-----------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (MML command or failure)			
	1 – 2				COO (SLC 1 – 1)	 ------------------>		
	<-----------------	1 – 2		COO (SLC 1 – 1)	
	1 – 2			COA (SLC 1 – 1)	 ------------------>		
	<-----------------	1 – 2		COA (SLC 1 – 1)	
	1 – 2			TRAFFIC
					(from 1 – 1)	 ------------------>		
			
	<-----------------	1 – 2		TRAFFIC
		(from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start the traffic to B and C on all the links.	
2.	Deactivate the link 1 – 1, check that the COOs and COAs for 1 – 1 are received on link 1 – 2.	
3.	Check that the traffic from link 1 – 1 changed over to 1 – 2 and stop traffic.	
4.	Repeat the test without sending of COA from SP B to SP A	

MTP LEVEL 3
TEST NUMBER:	3.3	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Changeover on expiration of timer T2 (COO or ECO -> -)			
PURPOSE:	To check the changeover procedure when no COA is received in response of a COO previously sent	
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
	SP		A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ------------------>		
	<------------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ------------------>		
	<------------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (MML command or failure)			
	1 – 2			COO, SLC 1 – 1	 ------------------>		
				½
				½
				½T2
				½
				½			
	1 – 2			TRAFFIC
				(from 1 – 1)	 ------------------>		
	<------------------	1 – 2		TRAFFIC	(from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all the links.	
2.	Deactivate link 1 – 1, check that a COO is received for 1 – 1 on link 1 – 2.	
3.	After the expiration of T2, check that the changeover procedure is performed.	
4.	Check that the duration of T2 is inside the specified range.	
5.	Stop traffic and check that there was no duplication and no missequencing, some messages may be lost as the system should not perform retreival.	
6.	Repeat the test but replacing COO by ECO.	

MTP LEVEL 3
TEST NUMBER:	3.4	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Unreasonable FSN in COO/COA			
PURPOSE:	To check the changeover procedure on reception of a COO/COA containing an unreasonable FSN	
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
			SP		A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ------------------>		
	<------------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ------------------>		
	<------------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (MML command or failure)			
	1 – 2			COO, SLC 1 – 1	 ------------------>		
	<------------------	1 – 2		COA, SLC 1 – 1
		(unreasonable FSN)	
	1 – 2			TRAFFIC
				(from 1 – 1)	 ------------------>		
	<-----------------	1 – 2		TRAFFIC (from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all the links.	
2.	Deactivate link 1 – 1, check that a COO is received for 1 – 1 on link 1 – 2 and respond within T2 with a COA containing an unreasonable FSN.	
3.	Stop traffic, check that the changeover procedure has been performed.	
4.	Check that there was no duplication and no missequencing. Some messages may be lost as the system should not perform retreival.	
5.	Check that an indication is given by the system.	
6.	Repeat the test with a COO sent from B (instead COA) containing an unreasonable FSN.	

MTP LEVEL 3
TEST NUMBER:	3.5	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	changeover			
SUBTITLE:	Reception of a changeover acknowledgement without sending a changeover order (- <- COA or ECA)	
PURPOSE:	To check the changeover procedure on reception of an unexpected changeover acknowledgement	
PRE–TEST CONDITIONS:	Linkset with two available links	
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
		SP		A			SP		B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ----------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ----------------->		
	<----------------	1 – 2		TRAFFIC	
	<----------------	1 – 2		COA, SLC 1 – 1	
	1 – 1			TRAFFIC	 ----------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ----------------->		
	<----------------	1 – 2		TRAFFIC	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all the links.	
2.	Send a COA for 1 – 1 on link 1 – 2, check that this message is ignored.	
3.	Stop traffic and check that it has been received correctly.	
4.	Repeat the test with an ECA instead of a COA.	

MTP LEVEL 3
TEST NUMBER:	3.6	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Reception of an additional changeover order (- <- COO or ECO)	
PURPOSE:	To check the action of the system when a changeover order relating to a particular link is received after completion of changeover	
PRE–TEST CONDITIONS:	Linkset with the link 1 – 2 available	
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
				SP			A			SP		B	
	Link		Link	
:Start traffic			
	1 – 2			TRAFFIC	------------------->		
	<------------------	1 – 2		TRAFFIC	
	<------------------	1 – 2		COO, SLC 1 – 1	
	1 – 2			ECA, SLC 1 – 1	------------------->		
	1 – 2			TRAFFIC	------------------->		
	<------------------	1 – 2		TRAFFIC	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on link 1 – 2.	
2.	Send a COO for 1 – 1 on link 1 – 2 and check that an ECA is received in T2.	
3.	Stop traffic and check that it has been received correctly.	
4.	Check that an indication is given by the system.	
5.	Repeat the test with an ECO instead of a COO.	

MTP LEVEL 3
TEST NUMBER:	3.7	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Emergency changeover at one side of a linkset (COO <-> ECA)			
PURPOSE:	To check the emergency changeover procedure when a COO is acknowledged by an ECA	
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
				SP			A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ---------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ---------------->		
	<----------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (MML command or failure)			
	1 – 2			COO, SLC 1 – 1	 ---------------->		
	<----------------	1 – 2		ECA, SLC 1 – 1	
	<----------------	1 – 2		TRAFFIC (from 1 – 1)	
	1 – 2			TRAFFIC
				(from 1 – 1)	 ---------------->		
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.	
2.	Check the sending of a COO (from A) for 1 – 1 on 1 – 2 and check that an ECA is sent inside T2.	
3.	Check that the traffic is changed over from 1 – 1 to 1 – 2.	
4.	Stop traffic and check that it has been received correctly; no duplication and no missequencing. Some messages may be lost as the system should not perform retreival.	
5.	Repeat the test by sending COO from B (instead of A).	

MTP LEVEL 3
TEST NUMBER:	3.8	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Emergency changeover at one side of a linkset (COO <-> ECO)			
PURPOSE:	To check the emergency changeover procedure when a COO is acknowledged by an ECO	
PRE–TEST CONDITIONS:	Linkset with two available links.			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
			SP		A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ----------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ----------------->		
	<----------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (MML command or failure)			
	1 – 2			COO, SLC 1 – 1	 ----------------->		
	<----------------	1 – 2		ECO, SLC 1 – 1	
	1 – 2			COA, SLC 1 – 1	 ----------------->		
	1 – 2			TRAFFIC
				(from 1 – 1)	 ----------------->		
	<----------------	1 – 2		TRAFFIC (from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.	
2.	Check the sending of a COO (from A) for 1 – 1 on 1 – 2 and check that an ECO is sent (before T2 expires) and a COA is received.	
3.	Check that the traffic is changed over from 1 – 1 to 1 – 2.	
4.	Stop traffic and check that it has been received correctly; no duplication and no missequencing. Some messages may be lost as the system should not perform retreival.	
5.	Repeat the test but send COO from B (instead of A).	

MTP LEVEL 3
TEST NUMBER:	3.9	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE: 	Changeover			
SUBTITLE:	Emergency changeover at one side of a linkset (ECO <-> COA)			
PURPOSE:	To check the emergency changeover procedure when an ECO is acknowledged by a COA			
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
		SP		A			SP		B	
	Link		Link	
:Start traffic			
	1 – 1		TRAFFIC	 ----------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2		TRAFFIC	 ----------------->		
	<----------------	1 – 2		TRAFFIC	
	1 – 1			:Deactivate (failure)			
	1 – 2		ECO, SLC 1 – 1	 ----------------->		
	<----------------	1 – 2		COA, SLC 1 – 1	
	<----------------	1 – 2		TRAFFIC (from 1 – 1)	
	1 – 2		TRAFFIC
			(from 1 – 1)	 ----------------->		
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Check that an ECO is received for 1 – 1 on 1 – 2 and that a COA is sent before T2 expires.		
3.	Check that traffic is changed over from 1 – 1 to 1 – 2.		
4.	Stop traffic and check that it has been received correctly; no duplication and no missequencing, some messages may be lost as the system should not perform retreival.		
5.	Repeat the test but send ECO from B (instead of A).		

MTP LEVEL 3
TEST NUMBER:	3.10	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Emergency changeover at one side of a linkset (ECO <-> ECA)			
PURPOSE:	To check the emergency changeover procedure when an ECO is acknowledged by an ECA			
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
					SP		A					SP		B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ----------------->		
	<----------------	1 – 1			TRAFFIC	
	1 – 2			TRAFFIC	 ----------------->		
	<----------------	1 – 2			TRAFFIC	
	1 – 1			:Deactivate (failure)			
	1 – 2			ECO, SLC 1 – 1	 ----------------->		
	<----------------	1 – 2			ECA, SLC 1 – 1	
	<----------------	1 – 2			TRAFFIC (from 1 – 1)	
	1 – 2			TRAFFIC
				(from 1 – 1)	 ----------------->		
			
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Check that an ECO is received for 1 – 1 on 1 – 2 and that an ECA is sent before T2 expires.		
3.	Check that traffic is changed over from 1 – 1 to 1 – 2.		
4.	Stop traffic and check that it has been received correctly; no duplication and no missequencing. Some messages may be lost as the system should not perform retreival.		
5.	Repeat the test but send ECO from B (instead of A).		

MTP LEVEL 3
TEST NUMBER:	3.11	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Emergency changeover at one side of a linkset (ECO <-> COO)			
PURPOSE:	To check the emergency changeover procedure when a COO is received in response to an ECO			
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
					P		A			SP		B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 --------------->		
	<---------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 --------------->		
	<---------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (failure)			
	1 – 2			ECO, SLC 1 – 1	 --------------->		
	<---------------	1 – 2		COO, SLC 1 – 1	
	1 – 2			ECA, SLC 1 – 1	 --------------->		
	1 – 2			TRAFFIC
				(from 1 – 1)	 --------------->		
	<---------------	1 – 2		TRAFFIC (from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Check that an ECO is received for 1 – 1 on 1 – 2 and that a COO is sent before T2 expires and acknowledged with an ECA.		
3.	Check that traffic is changed over from 1 – 1 to 1 – 2.		
4.	Stop traffic and check that it has been received correctly; no duplication and no missequencing. Some messages may be lost as the system should not perform retrieval.		
5.	Repeat the test but sent ECO from B (instead of A).		

MTP LEVEL 3
TEST NUMBER:	3.12	PAGE: 	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Emergency changeover initiated at both ends at the same time (ECO <-> ECO)			
PURPOSE:	To check the emergency changeover procedure when it is initiated at the both ends simultaneously			
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
		SP		A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ----------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ----------------->		
	<----------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (failure)			
	1 – 2			ECO, SLC 1 – 1	 ----------------->		
	<----------------	1 – 2		ECO, SLC 1 – 1	
	1 – 2			ECA, SLC 1 – 1	 ----------------->		
	<----------------	1 – 2		ECA, SLC 1 – 1	
	1 – 2			TRAFFIC			
	 ----------------->		
	<----------------	1 – 2		TRAFFIC (from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Check that an ECO is received for 1 – 1 on 1 – 2 and that an ECO is sent before T2 expires and acknowledged with ECA.		
3.	Check that traffic is changed over from 1 – 1 to 1 – 2.		
4.	Stop traffic and check that it has been received correctly; no duplication and no missequencing. Some messages may be lost as the system should not perform retrieval.		
5.	Repeat the test without sending ECA from SP B to SP A.		

MTP LEVEL 3
TEST NUMBER:	3.13	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Reactivation of a link during a changeover procedure			
PURPOSE:	To check the changeover procedure when the link failure causing the changeover is removed during the procedure.			
PRE–TEST CONDITIONS:	Linkset with two available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
				SP		A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	------------------>		
	<-----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	------------------>		
	<-----------------	1 – 2		TRAFFIC	
	1 – 1				:Deactivate (failure)			
	1 – 1				:Activate (end of failure)			
:Wait			
:Stop traffic			
Note – This test will be performed if applicable (some systems may terminate the changeover procedure, then perform the changeback).			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Deactivate the link 1 – 1 and reactivate this link immediately.		
3.	Stop traffic and check that the changeover procedure has not been performed. Depending the time between the deactivation and the reactivation, a COO may be sent or not.		
4.	Check that the traffic used the links 1 – 1 and 1 – 2 normally.		

MTP LEVEL 3
TEST NUMBER:	3.14	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Simultaneous changeover			
PURPOSE:	To check that the system can correctly handle simultaneous failures of several links			
PRE–TEST CONDITIONS:	Linkset with three available links			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
			SP		A			SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ----------------->		
	<----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ----------------->		
	<----------------	1 – 2		TRAFFIC	
	1 – 3			TRAFFIC	 ----------------->		
	<----------------	1 – 3		TRAFFIC	
1 – 1, 1 – 2			:Deactivate (MML command or failure)			
	1 – 3			COO, SLC 1 – 1	 ----------------->		
	1 – 3			COO, SLC 1 – 2	 ----------------->		
	<----------------	1 – 3		COA, SLC 1 – 1	
	<----------------	1 – 3		COA, SLC 1 – 2	
	1 – 3			TRAFFIC
				(from 1 – 1 and
				1 – 2)	 ----------------->		
	<----------------	1 – 3		TRAFFIC
		(from 1 – 1 and
		1 – 2)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Deactivate the links 1 – 1 and 1 – 2 simultaneously.		
3.	Check that COOs are received on 1 – 3 for 1 – 1 and 1 – 2, and respond with COAs inside T2s. Check that traffic is changed over from 1 – 1 and 1 – 2 to 1 – 3.		
4.	Stop traffic and check that it has been received correctly (no lost messages, no duplication and no missequencing).		

MTP LEVEL 3
TEST NUMBER:	3.15	PAGE:	1 of 1		
REFERENCE:	Q.704 § 5 Fig. 28, Fig. 29, Fig. 30			
TITLE:	Changeover			
SUBTITLE:	Changeover to several alternative links within a linkset			
PURPOSE:	To check the changeover porcedure when there are several alternative links			
PRE–TEST CONDITIONS:	Linkset with all links available			
CONFIGURATION:	A	TYPE OF TEST:	VAT	TYPE OF SP:	ALL	
MESSAGE SEQUENCE:			
			SP		A		SP	B	
	Link		Link	
:Start traffic			
	1 – 1			TRAFFIC	 ------------------>		
	<-----------------	1 – 1		TRAFFIC	
	1 – 2			TRAFFIC	 ------------------>		
	<-----------------	1 – 2		TRAFFIC	
	1 – 3			TRAFFIC	 ------------------>		
	<-----------------	1 – 3		TRAFFIC	
	1 – 4			TRAFFIC	 ------------------>		
	<-----------------	1 – 4		TRAFFIC	
	1 – 1				:Deactivate (MML command or failure)			
1 – 2, 3 or 4		COO, SLC 1 – 1	 ------------------>		
	<-----------------	1 – 2, 3 or 4	COA, SLC 1 – 1	
	1 – 2			TRAFFIC
				(from 1 – 1)	 ------------------>		
	<-----------------	1 – 2		TRAFFIC (from 1 – 1)	
	1 – 3			TRAFFIC
				(from 1 – 1)	 ------------------>		
	<-----------------	1 – 3		TRAFFIC (from 1 – 1)	
	1 – 4			TRAFFIC
				(from 1 – 1)	 ------------------>		
	<-----------------	1 – 4		TRAFFIC (from 1 – 1)	
:Wait			
:Stop traffic			
			
TEST DESCRIPTION			
1.	Start traffic to B and C on all links.		
2.	Deactivate the link 1 – 1 and check that the changeover is performed to links 1 – 2, 1 – 3 and 1 – 4.		
3.	Stop traffic and check that it has been shared on the alternative links according to the load sharing policy of this linkset.		
4.	Check that, for each destination and for each SLS, there was no lost messages, no duplication and no missequencing.