MINI-LINK E and E Micro
Note:
Protection switching cannot be made hitless in a working standby
configuration for 4x2 Mbit/s traffic capacity using an SMU Sw. The
problem is solved by using an SMU 8x2 or an SMU 16x2 instead.
Table 3
Priority for hardware switching in the receiver
Hardware Switch
switching criteria
(receiver)
Alarm
Priority
Switching due to hardware failure
Manual switch mode
1
MMU does not exist
NCC Ra
2
CSS failure
MMU
Proc. Hardware
Proc. Software
EEPROM
3
RAU
Proc. Hardware
Proc. Software
EEPROM
RCC
MMU MUX
System line fault
4
Transmitter selected
If none of the alarms above
are active, receiver hardware
selection follows transmitter
selection
5
See section Section 6.1.4.1 on page 97 for an alarm description.
The control signals from the Switch Logic control the hardware switches located
in the traffic interface of each MMU. The switch modes are on/off. The signal
from the faulty channel is switched off and the signal from the standby channel
is switched on.
The hardware switch follows the switched transmitter, so that the same
hardware is selected on the transmitting and receiving sides. Independently the
RMX switch selects the best receiver.
61
AE/LZT 110 2012 R8C 2002-03-04
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