Ericsson MINI-LINK TN R3 ETSI, Technical Description

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Basic Node
3.11 Equipment Handling
The system offers several functions for easy operation and maintenance.
• Plug-in units can be inserted while the NE is in operation. This enables
adding of new Radio Terminals or other plug-in units without disturbing
existing traffic.
• Plug-in units can be removed while the NE is in operation.
• Each plug-in unit has a Board Removal button (BR). Pressing this button
causes a request for removal to be sent to the control system.
• When replacing a faulty plug-in unit, the new plug-in unit automatically
inherits the configuration of the old plug-in unit.
• The system configuration is stored non-volatile on the RMM on the NPU
and can also be backed up and restored using a local or central FTP
server. The RMM storage thus enables NPU replacement without using a
FTP server.
• The backplane in all AMMs has an digital serial number which is also stored
on the NPUs RMM. When inserting an NPU, for example as a replacement,
the serial numbers are compared on power up.
• When an RAU is replaced, no new setup has to be performed.
• Various restarts can be ordered from the management system. A cold
restart can be initiated for an NE or single plug-in unit, this type of restart
disturbs the traffic. A warm restart is only available for the whole NE. This
will restart the control system and will not affect the traffic. This is possible
due to the separated control and traffic system.
• All plug-in units are equipped with temperature sensors. Overheated
boards, which exceed limit thresholds, are put in reduced service or out
of service by the control system. This is to avoid hardware failures in
case of a fan failure. The plug-in unit is automatically returned to normal
operation when temperature is below the high threshold level. There are
two thresholds:
− Crossing the high temperature threshold shuts down the plug-in unit’s
control system (reduced operation). The traffic function of the plug-in
unit will still be in operation.
− Crossing the excessive temperature threshold shuts down the entire
plug-in unit (out of service).
• Access to inventory data like software and hardware product number,
serial number and version. User defined asset identification is supported,
enabling tracking of hardware.
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