3Com DSA-3CV1100-02 service manual From Traffic Counts Frame counts, Fatal

Using a PC Terminal Emulator to Solve Problems 129

Abnormal Indications	Table 19 provides a quick reference to problem identification by using
from Traffic Counts	frame counts:
	Table 19 Summary of Problems Indicated by Counts of Errored Frames
	Problem	Solution

Errored frame count of one of the following Ethernet traffic counters differs from zero: CRC error, Overrun, Alignment error, Frame too long, or Frame too short.

Use an alternative VCN AC port or replace the RJ-45 cable, or replace the Ethernet switch. (in this order)

Errored frame count of one of the following HDLC traffic counters differs from zero: Retransmission, Tx error, Overrun, Not mine, or DPLL error. Or errored frame count of the following HDLC traffic counters are frequently incremented: Abort sequence, Nonaligned, CRC error, Frame too long.

Use an alternative VCN AC port or replace the VCN AC unit.

Error Messages There are two types of error messages that appear on the management terminal screen:

■Advisory

The only error message of this type is Wrong enter! It appears when the user enters the wrong response to a menu. The user solves the problem by re-entering his response.

When a user disconnects the management terminal from an LMI port and later reconnects to the same port, the LMI menu system stays in the same state and expects the same user input after reconnect. During reconnect the user may press the wrong sequence of keys and cause Wrong enter! to be displayed on the screen. Press the ENTER key a few times until a menu appears.

■Fatal

Almost all error messages that do appear are fatal. Contact Technical Support when an error message, except for Wrong enter!, appears. The most common fatal error messages are listed in Table 20.

Table 20 Fatal Error Messages

Error message	Significance	User Action
FATAL ERROR: SDRAM test	Hardware error during	Contact Technical Support.
failed!	boot-up
FATAL ERROR: failed FLASH	Hardware error during	Contact Technical Support.
access!	boot-up