XRT74L73 Datasheet, PDF (439/488 Pages) Exar Corporation – 3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER

PRELIMINARY
XRT74L73
3 CHANNEL, ATM UNI/PPP DS3/E3 FRAMING CONTROLLER
REV. P1.0.1
FIGURE 201. THE STATE MACHINE DIAGRAM FOR THE RECEIVE E3 FRAMER E3 FRAME ACQUISITION/MAINTE-
NANCE ALGORITHM
FA1, FA2
Octet
Search
FA1 and FA2 octets are
detected once
FA1, FA2
Octet
Verification
FA1 and FA2 octets are
not detected
LOF
Condition
FA1 and FA2 octets
are verified once
1 or 3 ms of operating
in the OOF condition
(user-selectable)
OOF
Condition
3 consecutive
Valid Frames
4 consecutive
In-valid Frames
In Frame
Frame Maintenance
Mode
440