Nortel DMS-100 Manual page 21

1-8 System recovery controller
After the SRC receives a request to load a static group member, the SRC builds
a dynamic group. The SRC uses the combination of the following two
methods to form the group:
•
•
The system notifies the SRC when a system-busy unit requires loading. The
SRC group manager creates a group of PMs that can be broadcast-loaded.
When the SRC forms a group, it coordinates the broadcast loading. If a PM
has only one unit that requires broadcast loading, the PM drops from the group.
The SRC submits a normal load request for the unit. To save system resources,
the SRC uses broadcast loading even when the group contains only one PM.
Broadcast loading saves system resources because when both units require
broadcast loading, unit 0 sends the load messages to unit 1.
If the SRC does not recover a group of PMs, the SRC attempts automatic
broadcast loading again. If the second attempt fails, the SRC attempts to
recover the PMs one by one.
Note: The SRC performs automatic broadcast loading on the following PMs:
•
•
•
•
There is a limit of eight broadcast load groups in a DMS switch at any one
time.
Note 1: Series I PMs do not support broadcast loading.
Note 2: LCMs/DLMs/IPEs that subtend remote cluster controller (RCC)
can be broadcast-loaded only with other LCMs/DLMs/IPEs that subtend
RCCs. LCMs/DLMs/IPEs that subtend line group controller/ line trunk
controller (LGC/LTC) XPMs can be broadcast-loaded only with other
LCMs/DLMs/IPEs that subtend LGC/LTC XPMs. LCMs that subtend
RCCs and LCMs/DLMs/IPEs that in turn subtend LGC/LTC XPMs cannot
be broadcast-loaded together.
297-8021-545 Standard 14.02 May 2001
The SRC queries the group members for loss of load with the ROM/RAM
query message. The SRC only queries XPMs with NT6X45BA or higher
controller cards
The SRC waits for autoload requests from the group members over a short
period of time. The SRC submits the autoload requests after the equipment
fails to return to service. The SRC identifies the cause of the failure as a
load loss or faults in the load.
XPMs (data entered in table LTCINV)
line concentrating modules (LCM) (data entered in table LCMINV)
digital line modules (DLM) (data entered in table DLMINV)
IPEs (data entered in table IPEINV)