EXFO FTB-800 Series for FTB-1 - Manual (Page 287)

Test Results
NetBlazer 277
Alarms/Errors

Unexp Period (Unexpected Period)
RX: A CCM frame is received from the peer MEP with correct MEG/MD
Level, MEG ID/MAID, and MEP ID but with a period field value different
than the one configured. The alarm is cleared when no CCM frames
with incorrect period field value are received within an interval equal
to 3.5 times the configured CCM transmission period.

RDI (Remote Defect Indication)
RX: The RDI flag bit of a valid CCM frames is set to 1. A valid CCM frame
has its source MAC address matching the Peer MEP MAC address, the
destination MAC address matching either the unit port Unicast MAC
address or a Multicast class 1 address
1
, and VLANs matching the unit
port VLANs.
TX: The RDI flag bit of transmitted CCM frames is set to 1.
Note: The following alarms are available with Y.1731 and MEF modes.

AIS (Alarm Indication Signal)
RX: A valid AIS frame is received. A valid frame has its destination MAC
address matching either the unit port Unicast MAC address or a
Multicast class 1 address
1
, VLANs matching the unit port VLANs, and
MEG level matching the local MEG level. The alarm is cleared when
during an interval equal to 3.5 times the AIS transmission period
indicated in the last received AIS frame, no AIS frames are received.

LCK (Locked)
RX: An valid LCK frame is received. A valid frame has its destination
MAC address matching either the unit port Unicast MAC address or a
Multicast class 1 address
1
, VLANs matching the unit port VLANs, and
MEG level matching the local MEG level. The alarm is cleared when
during an interval equal to 3.5 times the LCK transmission period
indicated in the last received LCK frame, no LCK frames are received.
1. Refer to Unicast/Multicast Addresses for S-OAM on page 574 for more information.