Nortel Meridian SuperNode SL-100 Reference Manual page 100

Operational Measurements (OMs)
The OM group PMOVLD is an existing OM group that consists of Origination
Denied (PORGDENY) and Termination Denied (PTRMDENY) fields. The
PORGDENY and PTRMDENY provide information on originations and
terminations that are denied in either the CC or the XPM during overload on
an individual peripheral basis, respectively. However, the PTRMDENY is
defined but is not fully implemented and used while the PORGDENY provides
origination shedding statistics to improve existing systems and identify new
peripheral overload conditions.
This feature introduces each IPE peripheral as one of the keys to OM group
PMOVLD. The PORGDENY OM message that contains the PORGDENY
OMs of the peripherals is sent every 3 minutes from the XPM to the CC. The
PORGDENY for an IPE peripheral is pegged under various internal flow
control denial conditions manipulated by the XPM flow control system.
These internal conditions include:
• shedding stale messages in various queues
• exceeding the maximum allowable number of messages for an originating
or terminating terminal
• shedding old origination messages for the new originations
• losing originations because the resources are completely used up by
terminations
• losing call processing messages due to unavailability of resources for
queuing new work
This feature extends the existing OMSHOW CI command by allowing a MAP
terminal on a switch to have immediate display of information on origination
denial tuples in OM group PMOVLD on an individual IPE basis.
The following figure shows examples of OM group PMOVLD.
Meridian SuperNode MSL-100 Intelligent Peripheral Equipment (IPE) Reference Manual MSL14
Feature implementation 6-13