Network Configuration Requirements. Board Configuration Requirements. Equipment-Level Protection Configuration Requirements, страница 7

n STM-1 (electrical signal) services: the protection slot is slot 16, the protected slots are slots 13, 14, and 15.

P: protection board

W: working board

Figure A-7 TPS configuration for hybrid service

A.4 Network-Level Protection Configuration Requirements

Table A-13 lists the requirements of protection mode selection.

Table A-13 Selection requirements of protection mode

Networking mode	Protection for service on a single ring	Protection for service from ring to chain or from ring to ring
STM-1 ring network or ring with chain network	Sub-Network connection protection (SNCP)	SNCP
STM-4/16 ring network or ring with chain network	Two-fiber MSP ring Four-fiber MSP ring	SNCP or linear MSP
STM-64 ring network or ring with chain network	Two-fiber MSP ring Four-fiber MSP ring	SNCP or linear MSP
Network of two nodes	MSP ring	Linear MSP

Warning:

n A protection ring or chain should not be formed by optical interfaces on one optical interface board.

n The recovery time of a protection switching in a protection subnet should be identical.

Table A-14 shows the configuration requirements of MSP ring.

Table A-14 Configuration requirements of MSP ring

No.	Item	Requirement
1	Number of nodes on a ring	The number of nodes cannot exceed 16. Otherwise, use SNCP.
2	Switching recovery time	600 seconds
3	B2-SD switching	Enabled
4	An optical interface supports more than one MSP ring	An STM-64 optical interface supports up to 4 MSP rings. Four sets of K bytes are in the 1st, 17th, 33th and 49th STM-1 respectively. An STM-16 optical interface supports up to 2 MSP rings. The two sets of K bytes are in the 1st and 5th STM-1.
5	Virtual shared protection ring	Support up to four MSP rings.

Warning:

When the OptiX OSN 3500 is performing the networking of an MSP ring, the node number of ring needs not to increase one by one from zero to N–1.

Table A-15 gives the configuration requirements of linear MSP.

Table A-15 Configuration requirements of linear MSP

No.	Item	Requirement
1	Switching recovery time	600 seconds
2	B2-SD switching	Enabled
3	1+1 protection	Switching bridge: single-ended switching Switching recovery: nonrevertive mode
4	1:N (N£14) protection	Switching bridge: dual-ended switching Switching recovery: revertive mode

Table A-16 shows the configuration requirements of SNCP.

Table A-16 Configuration requirements of SNCP

No.	Item	Requirement
1	DNI networking	For SNCP, the master/slave nodes must be set correctly along the primary ring.
2	DNI networking	For service on chain, SNCP and linear MSP are exclusive to each other.
3	Protection service capacity	Maximum: 1184
4	Co-existing with MSP	To avoid mutual effect, set the SNCP delay 50ms longer than the switching time of MSP.
5	DNI networking	For service on chain, use either SNCP or linear MSP.

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