ItuiPDUUtilPeak

Measurement Type: Max

Measurement Group: Server Resource Usage

Description: The peak ITUI/ITUN PDU Buffer Pool utilization (0-100%) measured during the collection interval.

Collection Interval: 5 min

Peg Condition: The maximum SS7 ITUI/ITUN PDU Buffer Pool utilization sample taken during the collection interval.

Measurement Scope: NE, Server

Recovery:

ITUI PDU is allocated to each ITUI message that arrives at an MP and is de-allocated when message processing completes. This measurement is useful for evaluating whether persistent network problems exist. In general PDU buffers are engineered for required SS7 domains and the processing capacity of the MP. If network problems exist, delaying the off-loading of egress messages from the MP, then PDUs/messages will sit in internal SS7 queues.
If both the peak and average measurements for multiple MPs within a Network Element are consistently near the recommended maximum engineered capacity of an MP when the Ingress Message Rate and/or SS7 Process CPU Utilization measurements are below the recommended maximum engineered capacity of an MP, then a network (IP or SS7) problem may exist. Looking at these measurements on a time of day basis may provide additional insight into potential network problems.
If the peak and average for an individual MP is significantly different than other MPs in the same Network Element then an MP-specific software problem may exist (e.g., a buffer pool leak).
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