IBM ATM OC-3c manual 4CHAPTER 9 Monitoring the ATM Module

9-4CHAPTER 9: MONITORING THE ATM MODULE

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 Appendix E.

■The optic fiber cable is too long or does not meet other technical specifications. Check the cable against the technical specification given in Appendix C, “ATM Module Technical Specifications”.

■The optic fiber connectors are dirty. To clean the connectors, follow the instructions given in “Cleaning Dirty Fiber Optic Connectors”, on page D-24.

■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.