MINI-LINKEandEMicro
Note: Protection switching cannot be made hitless in a working standby
configuration for 4x2 Mbit/s traffic capacity using an S MU Sw. The
problem is s olved by using an SMU 8x2 or an SMU 16x2 instead.
Table 3 Prior ity 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
Transm itter selected If none of the alar ms 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 S witch 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 sw itched 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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