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9-4 C
HAPTER
9: M
ONITORING
THE
ATM M
ODULE
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.