IBM OPTIONS ATM OC-3c, User Manual

Page: 76 / 140

9-10 C
HAPTER
9: M
ONITORING THE
ATM M
ODULE
Frames Received The number of Ethernet frames
received by the LEC.
Frames Transmitted The number of Ethernet frames
transmitted by the LEC.
Octets Received The number of Ethernet octets
received by the LEC.
Octets Transmitted The number of Ethernet octets
transmitted by the LEC.
If you see the following symptoms, there may be a
problem at the ATM Switch end of the connection:
The LEC is active and the LEC Operation at Failure is
None , but the frames or octets counters are showing
zero.
If you have followed the troubleshooting instructions
in this section and within Appendix D, and you still
have a problem, contact IBM Technical Support. Refer
to Appendix E for details.
The following button is available on this screen:
CLEAR SCREEN COUNTERS To make it easier to note
the changes in statistic values, you can use this button
to reset the value of statistics shown on the screen to
zero. Resetting the values shown on the screen does
not reset the statistic values stored on this device.
ATM Physical Layer Statistics
The Physical Layer Statistics screen shows SONET STS-3c
and SDH STM-1 error statistics. These statistics are used
to track down problems with the physical connection,
and are more useful in a WAN environment.
To access Physical Layer statistics, first access the ATM
Port Statistics screen, as described in “ATM Port
Statistics” on page 9-3, and then select the PHYSICAL
button.
An example of the Physical Layer Statistics screen is
shown in Figure 9-5 on page 9-11, and the statistics
are described in the following text.
Port Identifies the currently selected port.
OCD State Shows the
Out of Cell Delineation (OCD)
state. The OCD State is set to
Fail
when seven
consecutive cells have had Header Error Control
violations. This implies that the cell has been
corrupted and that there is probably a hardware
problem with the ATM Module or ATM Switch.
The OCD State is only set to OK when six good cells
are received by the ATM Module followed by
approximately 10 seconds of good signal from the
ATM fiber optic cable.