Ericsson MINI-LINK BAS, Техническое описание, Страница: 105 / 174

6-21 MINI-LINK BAS
EN/LZB 111 0542 P2B Technical Description
Each slot can be configured to accept a specific board, or it can be
configured to be plug-and-play and to accept any inserted board.
If the download is unsuccessful, the system can be downgraded to the
previous version without need of an additional download. The
terminals will rollback automatically to the previous software version
if it is not possible to re-establish the contact with the CP, the rollback
of the other boards must instead be ordered through specific
commands from the CP.
The management hierarchy and protocol determine whether a board
can be inserted, detected and configured in a certain position that
board, otherwise, lits a red light.
Software download is also possible locally through the ACT. By use
of this tool it is possible to download a new software version onto an
AT.
6.6.3 Equipment Supervisioning
When a position, that is a slot, is put into the managed state, the slot
type become supervised.
Slots, that are defined to hold DPs, are supervised directly by the CP.
The management system starts scanning the network for scanning the
units.
If a board is detected, the system verifies whether the hardware
identity, that is the actual board type, and hardware revision are as
expected. If this is the case, the software identity and software
revision are then checked; if these do not match, an automatic
software download procedure is started.
When all these operations come to the end, the corresponding HHs are
informed of the new board, which is now ready for operation because
both hardware and software have been checked. Once HHs finish their
work, they inform the Connection Handler, which in turn will then
set-up preconfigured cross connections over this hardware.
If the above mentioned scan fails for a number of times, the board is
considered as removed, and is reported as such to the HHs. Again, the
connection handler is informed; the cross connections using this
hardware unit are established as well, but they are set to the disabled
state.