o  buffer unavailable errors

    Number of times that the Physical layer reported that no buffer
    was available to hold a message. This counter is not supported in
    all implementations.

 o  crc errors received

    Number of frames received that had a bad CRC.

 o  creation time

    Time at which this entity was created.

 o  times pdu receive overrun

    Number of times a Physical line indicated an overrun condition
    to the Data Link layer. This counter is not supported in all
    implementations.

 o  times pdu transmit failed

    Number of times that an attempt to send a frame failed.

 o  up transitions

    Number of times that the entity's status attribute state has
    changed from off to on.