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Lucent Technologies Inc.
TMXF28155 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet, Rev. 1
October 2000
104
TMUX Functional Description
(continued)
Receive Direction (Receive Path from Sonet/
SDH)
(continued)
I
The pointer interpreter will transition out of the LOP
state based on the following conditions:
— Following three consecutive frames with all ones
in the H1 and H2 bytes, the pointer interpreter will
transition from the LOP state into the AIS state.
— Following three new consecutive, consistent, and
valid pointers, the pointer interpreter will transition
from the LOP state into the NORM state.
— The pointer interpreter
will not transition from the
LOP state into the NDF state.
I
The pointer interpreter will transition into the AIS
state based on the following conditions:
— Following three consecutive frames with all ones
in the H1 and H2 bytes, AIS will be declared.
I
The pointer interpreter will transition out of the AIS
state based on the following conditions:
— Following three new consecutive, consistent, and
valid pointers, the pointer interpreter will transition
from the AIS state into the NORM state.
— Following eight consecutive invalid pointers, the
pointer interpreter will transition from the AIS state
into the LOP state.
— If NDF is enabled on the incoming H1 and H2
bytes the pointer interpreter will transition from the
AIS state into the NDF state.
I
The pointer interpreter will transition into the NDF
state based on the following conditions:
— If NDF is enabled on the incoming H1 and H2
bytes the pointer interpreter will transition from the
NORM, NDF, AIS, INC, and DEC states into the
NDF state.
I
The pointer interpreter will transition out of the NDF
state based on the following conditions:
— Continuous NDF. If NDF (1001, 0001, 1101, 1011,
and 1000) is received for eight consecutive frames
the pointer interpreter will transition from the NDF
state into the LOP state.
— Following any three consecutive, consistent, and
valid pointers, the pointer interpreter will transition
from the NDF state into the NORM state.
— Following three consecutive frames with all ones
in the H1 and H2 bytes, the pointer interpreter will
transition from the NDF state into the AIS state.
— Following three new, consecutive, consistent, and
valid pointers, the pointer interpreter will transition
from the NDF state into the NORM state.
— Following eight consecutive invalid pointers, the
pointer interpreter will transition from the NDF
state into the LOP state.
I
The pointer interpreter will transition into the NORM
state based on the following conditions:
— Following three new consecutive, consistent, and
valid pointers, the pointer interpreter will transition
into the NORM state.
— Following any three consecutive, consistent, and
valid pointers, the pointer interpreter will transition
into the NORM state. i.e., transitioning from the
INC, DEC, and NDF states.
I
The pointer interpreter will transition out of the
NORM state based on the following conditions:
— Following eight consecutive invalid pointers the
pointer interpreter will transition from the NORM
state into the LOP state.
— If NDF is enabled on the incoming H1 and H2
bytes the pointer interpreter will transition from the
NORM state into the NDF state.
— Following three consecutive frames with all ones
in the H1 and H2 bytes the pointer interpreter will
transition from the NORM state into the AIS state.
— When operating in the 8 of 10 mode, controlled by
TMUX_8ORMAJORITY = 1 (Table 57), if 8 of the
10 I and D bits are correct for a pointer decrement
on the incoming H1 and H2 bytes the pointer inter-
preter will transition from the NORM state into the
DEC state. Otherwise, if 3 of the 5 I bits and 3 of
the 5 D bits are correct for a pointer decrement on
the incoming H1 and H2 bytes the pointer inter-
preter will transition from the NORM state into the
DEC state.
— When operating in the 8 of 10 mode
(TMUX_8ORMAJORITY = 1), if 8 of the 10 I and D
bits are correct for a pointer increment on the
incoming H1 and H2 bytes the pointer interpreter
will transition from the NORM state into the INC
state. Otherwise, if 3 of the 5 I bits and 3 of the 5 D
bits are correct for a pointer increment on the
incoming H1 and H2 bytes the pointer interpreter
will transition from the NORM state into the INC
state.The pointer interpreter will transition into the
INC state based on the following conditions:
— When operating in the 8 of 10 mode
(TMUX_8ORMAJORITY = 1), if 8 of the 10 I and D
bits are correct for a pointer increment on the
incoming H1 and H2 bytes the pointer interpreter
will transition into the INC state. Otherwise, if 3 of
the 5 I bits and 3 of the 5 D bits are correct for a
pointer increment on the incoming H1 and H2
bytes the pointer interpreter will transition into the
INC state.