Lucent Technologies P220, P550R Front Panel Display, Hardware, Frames Transmitted with CRC Errors

Front Panel Display

Problem: The 'lastlink' application on the front panel display does not work on the Cajun P220FE or P220G.

Workaround: Currently, no workaround is available.

Hardware

Frames Transmitted with CRC Errors

For the Cajun P550 20-port Module, Model M5520-100TX (P/N 311-0020-000: Revision Level

Aor B), and the Cajun P550 12-port Module, Model M5512R-100TX, a temperature sensitivity problem has been found when operating at 10Mbps. This sensitivity will result in the port transmitting frames with CRC errors. These frames, since they have CRC errors, are then dropped by the receiving station. Note that this problem only occurs at 10Mbps. 100Mbps operation is not affected.

Software Release v1.0.17 (or later) has implemented a new configuration that disables the power saving mode of the Phy chip. Disabling the power saving mode has the effect of moving the operational temperature of the part past the problem range. Testing this software configuration is 100% successful in resolving the error.

The software configuration command is only available from the CLI. It is saved in NVRAM. Users should only disable the power saving mode for ports that are experiencing this problem. Disabling the power saving mode for parts that are operating at a lower temperature than the problem range may accidentally raise the temperature into the problem range. In legacy-cli mode, use the following command to disable the power saving mode for ports:

Cajun> port set DisablePowerSave <slot>.<port> on

NOTE: To enter legacy mode, type legacy-clithe Enhanced CLI from legacy mode, type exit

at the command prompt. To return to at the command prompt.

Hot Swap Modules

Hot swapping modules may cause SEPROM and SMAC panic messages to appear in the event log. These messages are for informational purposes only and should be ignored.

Cajun P220, P550, P550R Switch Release Notes, Release 4.0.1 14