PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
10.5.2 Concatenation pointer interpreter state machine
The concatenation pointer interpreter extracts and validates the H1 and H2 concatenation bytes.
Within the pointer interpretation algorithm three states are defined as shown below.
CONC_state (CONC)
AISC_state (AISC)
LOPC_state (LOPC)
The transitions between the states will be consecutive events (indications), e.g. three consecutive
AIS indications to go from the CONC_state to the AISC_state. The kind and number of
consecutive indications activating a transition is chosen such that the behaviour is stable and
insensitive to low BER.
Figure 10: Concatenation pointer interpretation state diagram
CONC
8 x INV_POINT
3 x AIS_IND
3 x CONC_IND
3 x CONC_IND
3 x AIS_IND
LOPC
AISC
8 x INV_POINT
The following events (indications) are defined:
CONC_IND:
AIS_IND:
enabled NDF + dd + “1111111111”
H1 = FFh + H2 = FFh
not any of the above (i.e.: not CONC_IND and not AIS_IND)
INV_POINT:
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