Vol. VI-B-48 Alcatel-Lucent
Additional Information
Direct Link options provide:
a) Port 1 to Channel 1 direct connection or,
b) Port 1 to Channel 1, and Port 2 to Channel 2.
When active, port to channel associations configuerd in the DAC ES / DAC GE
plug-ins screen are replaced by the selected option.
Transport Channel (n) Switch Packet Errors
High FCS (frame check sequence) errors where ‘n’ is channel 1 or 2. This is a
warning alarm.
Probable Cause
Traffic received on the alarmed channel is errored. The errors may be caused by
equipment/circuit malfunction or radio path degradation.
Recommended Actions
1. Check alarms on the remote DAC ES / DAC GE.
• If the same alarm is present, it indicates a both-way problem, which is
likely to be caused by radio path degradation. Confirm by checking path
alarms and alarm history on the radio links connecting the DAC ES / DAC
GE plug-ins.
• If the same alarm is not present, it indicates an equipment or process
malfunction, which may be in the local or remote DAC ES / DAC GE, or
within associated RAC/ODUs providing the connection. Check node
alarms at the local and remote sites, and at any intermediate sites, for
possible problems.
2. The DAC ES / DAC GE PRBS generator and loopback diagnostic options
may be used to verify DAC ES / DAC GE channel-to-channel operation.
• Use the channel loopback setting for a go-and-return test.
• Without a loopback a one-way test is supported, using the PRBS Tx
function at one end, and Rx at the other.
3. If there are no other alarms or performance issues to indicate the likely source
of the problem, replace first one DAC ES / DAC GE, and then the other. They
are hot-pluggable.
Additional Information
Switch packet errors are determined over a DAC ES / DAC GE link, which may
exist across multiple radio paths; error checking is between local and remote
DAC ES / DAC GE plug-ins.
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