EXFO FTB-800 Series for FTB-1 - Manual (Page 483)

Test Control
NetBlazer 473
Lpbk Tool Button (Loopback Tool)

S-OAM Responder check box when selected (default) allows to
respond to LBM, LTM, DMM, LMM, and SLM valid messages
(Lpbk Tool must be started, see Loopback button below). Traffic
statistics are also monitored (refer to Responder on page 381).
Responder - TX Count reports respectively the count of LBR, LTR,
DMR, LMR, SLR, and the total of frames transmitted.
Responder - RX Count reports counts of valid LBM, LTM, DMM,
LMM, SLM, and the total of frames received. A valid messages must
have its destination MAC address matching either the unit port
Unicast MAC address or a Multicast class 1 address
1
.

Loopback button starts/stops looping back the frames/packets that are
received. The default value is disabled.
Responds to... message Responds with... message
LBM LBR
LTM LTR
DMM DMR
LMM LMR
SLM SLR
1. Refer to Unicast/Multicast Addresses for S-OAM on page 574 for more information.