Huawei Proprietary and Confidential                                     
Copyright © Huawei Technologies Co., Ltd. 
communication between 
the master subrack and 
slave subracks. 
NOTE 
When inter-subrack 
protection is configured, the 
ETH3 interface cannot be 
used for the communication 
between the master and slave 
subracks. 
 
Connects a network 
cable to a CRPC or 
ROP board to achieve 
communication with the 
CRPC or ROP board. 
Outputs single-subrack or 
multi-subrack alarms to the 
cabinet indicator interface 
to light the corresponding 
alarm indicators on the 
cabinet. 
NOTICE 
The LAMP interfaces on the 
EFI board provide 5 V power, 
it is only used for the 
indicators on a cabinet. It 
cannot connect to an RJ45 
cable intended for the 
NM_ETH, ETH, ALMO, or 
CLK interface; otherwise, the 
EFI board, the connected test 
instrument, or the equipment 
will be damaged. 
For information about the 
interface cables, see 2.6.1 
Cabinet Alarm Indicator 
Cable.