The ATM Port Statistics screen provides a top level summary of traffic levels on the ATM Port. You can use the summary to estimate the amount of traffic on your network backbone, and to check the health of the incoming connection. Statistics are grouped into:

• ATM Port Bandwidth use and incoming connection health.

• AAL5 layer health and use.

• ATM layer health and use.

To view the ATM Port statistics:

1 .   Select the SWITCH MANAGEMENT option from the Main Menu. The Switch Management screen is displayed, as shown in Figure 9-2.

Figure 9-2 Switch Management Screen

2 .   Enter the number of the ATM port in the Port ID field.

3 .   Select the STATS button to display the ATM Port Statistics screen.

4 .   An example of the ATM Port Statistics screen is shown in Figure 9-3.

Figure 9-3 ATM Port Statistics Screen

The figures shown for each statistic on this screen include ATM management traffic and normal Ethernet traffic.

The ATM Port Statistics screen displays the following fields:

Port ID Identifies the currently selected port.

Transmit Bandwidth Used Shows the percentage of available transmit bandwidth that is currently being used by transmit cells.

Receive Bandwidth Used Shows the percentage of available receive bandwidth that is currently being used by received cells.

Receive Errors Shows the percentage of cells received that have errors. For example, cells received with corrupted header information (Header Error Control - HEC).

Receive Errors indicate that there is something wrong with the link, and you should check for the following faults:

• Weak transmitter. Contact your supplier or Technical Support, as described in"Technical Support".

• The optic fiber cable is too long or does not meet other technical specifications. Check the cable against the technical specification given in "ATM Module Technical Specifications".

• The optic fiber connectors are dirty. To clean the connectors, follow the instructions given in "Cleaning Dirty Fiber Optic Connectors".

• If there is no traffic on the port, but there are Receive Errors, the SONET Scramble techniques on the ATM Module and ATM Switch are probably incompatible. Ensure that the SONET standards used are the same for the ATM Module and the ATM Switch.

The screen also shows the AAL5 layer statistics. AAL is a set of protocols that translate user traffic from higher-layer applications/protocols into small, fixed size cells, and reassembles them into the higher level frame format at the destination device. The ATM Module supports AAL5. The screen shows the following AAL5 Layer statistics:

Frames Received The number of frames received per second at the AAL5 interface for all traffic types (data and control).

Frames Transmitted The number of frames transmitted per second at the AAL5 interface for all traffic types (data and control).

Errored Frames The number of frames received that contain an error.

Octets Received The number of Ethernet octets received at the AAL5 interface.

Octets Transmitted The number of Ethernet octets transmitted at the AAL5 interface.

Discarded Frames The number of frames discarded at the AAL5 interface due to lack of resources.

The screen also shows the following ATM statistics:

Cells Received The number of ATM cells received by the port.

Cells Transmitted The number of ATM cells transmitted per second by the port.

Errored Cells The number of ATM cells that contain an error, for example, cells that have Header Error Control (HEC) errors.

Bad VCC Received The number of cells received where the specified connection is not recognized by the ATM Module (that is, the connection is not shown in the ATM Module Connection Table).

The following buttons are 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.

LEC This button takes you to the ATM VLAN LEC Status screen, which allows you to monitor the health of LECs and identifies the cause of any connection failures. The ATM VLAN LEC Status screen is described in "ATM VLAN LEC Status".

PHYSICAL This button takes you to the Physical Layer Statistics Screen, which allows you to monitor the health of the physical connection, and is more useful in a WAN environment. The Physical Layer Statistics Screen is described in "ATM Physical Layer Statistics".