Hirschmann RS20 User Manual page 174

Operation Diagnosis
The device allows you to detect this situation and report it to the network
management station. In the process, the device evaluates the error counters
of the port in the context of the port settings.
Possible causes of port error events

The following table lists the duplex operating modes for TX ports, with the
possible fault events. The meanings of terms used in the table are as
follows:

Collisions: In half-duplex mode, collisions mean normal operation.
 Duplex problem: Mismatching duplex modes.

EMI: Electromagnetic interference.

Network extension: The network extension is too great, or too many
cascading hubs.

Collisions, late collisions: In full-duplex mode, no incrementation of the
port counters for collisions or late collisions.
 CRC error: The device evaluates these errors as non-matching duplex
modes in the manual full duplex mode.
No. Automatic
configuration
1
On
2
On
3
On
4
On
5
On
6
On
7
On
8
On
9
Off
10
Off
11
Off
12
Off
13
Off
14
Off
Table 21: Evaluation of non-matching of the duplex mode
174
Current Detected error
duplex events (≥ 10
mode after link up)
Half duplex None
Half duplex Collisions
Half duplex Late collisions
Half duplex CRC error
Full duplex None
Full duplex Collisions
Full duplex Late collisions
Full duplex CRC error
Half duplex None
Half duplex Collisions
Half duplex Late collisions
Half duplex CRC error
Full duplex None
Full duplex Collisions
9.5 Event Counter at Port Level
Duplex modes Possible causes
OK
OK
Duplex problem Duplex problem, EMI,
detected network extension
OK EMI
OK
OK EMI
OK EMI
OK EMI
OK
OK
Duplex problem Duplex problem, EMI,
detected network extension
OK EMI
OK
OK EMI
UM BasicConfig L2E
Release 8.0 05/2013