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Protection SwitchingSchemes

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Classifications

LINEAR1+11:11:N 1+1 MSP RINGSNCPMSSP(2F)MSSP (4F)

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Protection Schemes

1+1 Protection

BA

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1:1 Protection

BA

Protection Schemes

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Unidirectional Operation

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Bidirectional Operation

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1+1 MSP – Multiplex Section Protection

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1+1 MSP

The MSP groups can be configured as uni-directional or bi-directional

Normal Operation

BA

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1+1 MSP

Switching in case of uni-directional configuration

A B

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1+1 MSP

Switching in case of bi-directional configuration

A B

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SNCP – Sub Network Connection Protection

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SNCP

Normal Operation

A B

C D

A B

C D

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SNCP

Switching in case of single fiber cut

A B

C D

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A B

C D

SNCP

Switching in case of dual fiber cut

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MS-SP – Multiplex Section Shared Protection

MS-SPRING defined for Ring network

No dedicated source required for protection

Improved switching time

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MS-SP

Normal Operation - Ring with protection

A B

C DWork Channel

Wo

rk C

ha

nn

el

Wo

rk C

ha

nn

el

Work Channel

Pro

tec

ti on

Ch

an

ne

lPro

tec

tio

n C

ha

nn

el

Protection Channel

Protection Channel

STM#1

STM#1

STM#1

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MS-SP

Switching in case of fiber cut

A BWork Channel

Protection Channel

C D

Wo

rk C

ha

nn

el

Wo

rk C

ha

nn

el

Pr o

t ec

ti on

Ch

an

ne

lPro

tec

tio

n C

ha

nn

el

Protection Channel

Work Channel

STM#9STM#9

STM#9

STM#1

STM#1

STM#9

STM#1

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A

working trafficprotecting traffic

B C

D E F

MS-SP-2F

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A B C

D E F

working trafficprotecting traffic

MS-SP-4F

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A B C

D E F

working trafficprotecting traffic

MS-SP-4F

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A B C

D E F

working trafficprotecting traffic

MS-SP-4F Span switching Switching

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A B C

D E F

working trafficprotecting traffic

MS-SP-4F Span switching Switching

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A B C

D E F

working trafficprotecting traffic

MS-SP-4F

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A B C

D E F

working trafficprotecting traffic

MS-SP-4F Ring Switching

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External Commands

Forced switch to protection

Forced switch to work

Manual switch to protect

Manual switch to work

Lockout of protection

Clear

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Thank You…