Using SCC Counts to Monitor Packet Creation and Reception for CTP Bundles (CTP Menu)
Serial Communications Controller (SCC) counts provide detail about packet creation and reception for a CTP bundle.
You cannot display SCC counts in CTPView.
To display SCC counts using the CTP Menu:
- From the CTP Main Menu, select 1) Bundle Operations.
- Select the type of bundle.
- Select a bundle from the list.
- Select 8) Runtime Diags.
- Select 7) SCC Counts.
A list of packet counters appears. Table 1 describes the counters.
Pkts to NET from I/F
Packets to network from interface. Number of packets that were sent to the IP network from the interface.
Pkts to NET ints
Packets to network interrupts. Number of packets destined for the IP network that were processed by the software.
Pkts to I/F from NET
Packets to interface from network. Number of packets that were sent to the interface from the IP network.
Pkts to I/F ints
Packets to interface interrupts. Number of packets destined for the interface that were processed by the software driver.
Pkts to I/F missing
Packets to interface missing. Number of packets destined for the interface that were not available when the data was needed. Unavailability can be caused by a dropped packet in the IP network or a delayed packet considered late by the CTP device according to the current buffer settings and state.
Pkts to I/F late
Packets to interface late. Number of packets destined for the serial interface that were not available when the data was needed. Unavailability can be caused by a dropped packet in the IP network or a delayed packet considered late by the CTP device according to the current buffer settings and state.
Pkts to I/F recenter cnt
Packets to interface recenter count. Number of buffer recenters since the last time statistics were cleared. Recenters are caused by either buffer underflow (buffer depleted) or the buffer exceeding the maximum delay configured for the bundle.
Under normal operations, the buffer recenter count should not increment. If the count is incrementing, check both the clocking configuration and the reference clocks being used by the CTP device. For example, if the local and remote ends of the bundle are configure with slightly different rates, buffer recenters will result. If the accuracy or stability of the references is inaccurate, recenters may also occur.
Pkts to I/F underflow cnt
Packets to interface underflow count. Number of times the minimum threshold was reached since the counter was last reset.
Pkts to I/F overflow cnt
Packets to interface overflow count. Number of times the minimum threshold was reached since the counter was last reset.
Pkts to I/F starve cnt
Packets to interface starvation count. Number of times the CTP device considered the bundle to be in a starvation condition. The CTP receive processor considers a starvation condition to be when a fixed consecutive number of packets are missing from the IP network. During this state, the buffer is recentered. Starvation can occur because of a failure in the IP network or because of a cabling or Ethernet interface problem.