Serial Port Offline Indication

This section describes the use of the serial port offline indication feature use.

The Serial port offline indication feature is used to monitor whether or not a serial tap is connected to a serial interface with this feature enabled. The topology is as follows.



Configuration

  1. CLI: Enable the serial port offline indication feature.

    Type the following:

    • Enter the Global Configuration Mode.
    
							Phoenix_Contact# configure terminal
    • Enter the Interface Configuration Mode.
    
							Phoenix_Contact(config)# interface serial 0/9
    • Enable the serial port offline indication feature.
    
							Phoenix_Contact(config-serial-if)# serial-port-offline enable

  2. WebUI: Enable the serial port offline indication feature.

    Type the following:

    • The feature shall also be configured from WebUI from the Serial Interface Configuration page as shown below.

    The feature can be enabled by choosing the Enabled/Disabled option from the Serial Line Monitoring column.

    • When disabled, the Serial Cable State would display Not Applicable (NA).
    • When enabled, the state shall be Connected/Disconnected based on presence of Serial tap.
  3. Alarms & SNMP Traps

    When the feature is enabled, Alarm is set to indicate whenever there is no serial tap connected. The alarm would be cleared when a serial tap is connected. The Alarm ID shall indicate the interface where the tap is absent/present by adding the interface index to the base Alarm ID:

    SNMP traps are triggered as well, when disconnecting/connecting the serial tap with serial interface index and status of the cable presence. The SNMP trap would be raised with the trap object ‘serialCableStateTrap'. The trap message also binds the values of the object ‘ifIndex’ and 'ifMainSerialIfCableConnected'.

  4. LCD & Port Map

    The value of the 'ifMainSerialIfCableConnected'is reflected in the Port Map status in WebUI and LCD. The serial interface status shall always be displayed as green if the feature is not enabled.

    If the feature is enabled, then status shall be:
    • green if the tap is connected, and
    • red if the tap is disconnected.



Verification

  1. The configuration can be verified using the show command as shown below.

    Type the following:



  2. The functionality shall be verified by checking the Alarms history under the switch alarms.

    Type the following:



    Note:

    When the feature is disabled after already enabled, then any existing alarms in the alarm history and Syslog history shall be cleared. There is no way to distinguish between an actual cleared alarm and the alarm cleared due to disabling of the feature. This is a limitation of the current design. However, the scenario of enabling and disabling is not foreseen often in the field.