System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
MSP Linear Multiplex Section Protection
Page 3-20 Proprietary Information Aastra
3.7.1.2 MSP Linear Multiplex Section Protection
With Multiplex Section Protection (MSP), the entire multiplex section
between two multiplexers will be protected.
Transmission takes place both via the operating path and protection path.
In case of a failure of the operating path, switchover to the protection path
takes place automatically in the far end.
In the XMP1 unit, Multiplex Section Protection is used for the protected
transmission via STM-N signals (of the SCU module).
A MSP can be configured for STM-N interfaces of on SCU module and for
STM-N interfaces of different SCU modules.
The STM-N signal to be protected is doubled on the SCU module of the
transmitter and send out via two line interfaces. On the SCU module of the
receiver, a selector is used to select the operational transmission path.
MSP 1+1 features
• Single-ended, switchover in one MUX
• Dual-ended 1+1, switchover in both MUXs
• Revertive; reversion once the operating path has been restored
• Non-revertive, no reversion after the operating path has been restored
• No extra traffic possible
Switchover
Switchover between the operating path and protection path takes place in
case of the following events:
• Line errors locally detected (SF and SD)
• Appropriate operator entries via the LCT or Element Manager:
— Force switch traffic to working channel.
— Force switch traffic to protection channel.
— Manual switch traffic to working channel.
— Manual switch traffic to protection channel.
— Lockout of protection.
Doubling
Selector switch
Working channel
Protection channel