NMS monitoring for multiple OSN 1800 devices at the same site

All NEs at a site can be set to gateway NEs. Three inter-NE communication modes are supported:
Manual extended ECC mode: In this mode, extended ECC can be performed between OSN 1800 devices or between an OSN 1800 device and another OTN or SDH device in the same equipment room.
OSC mode for RM/TM port interconnection
Master/Slave subrack mode

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