TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Data Sheet
June 2002
440
Agere Systems Inc.
19 VT/TU Mapper Functional Description
(continued)
I
The pointer interpreter will transition into the NDF state based on the following conditions:
— If NDF is enabled on the incoming V1 bytes and V2 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, 1000) is received for the number of consecutive super-
frames programmed in bits VT_NDF_NTIME[3:0] (
Table 196 on page 165
), the pointer interpreter will transi-
tion from the NDF state into the LOP-V 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 superframes with all ones in the V1 bytes and V2 bytes, the pointer interpreter will
transition from the NDF state into the AIS-V state.
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
NDF state into the NORM state.
— Following the number of consecutive invalid pointers programmed in bits VT_INV_NTIME[3:0] (
Table 196
), the
pointer interpreter will transition from the NDF state into the LOP-V 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 the number of consecutive invalid pointers programmed in bits VT_INV_NTIME[3:0], the pointer in-
terpreter will transition from the NORM state into the LOP-V state.
— If NDF is enabled on the incoming V1 bytes and V2 bytes, the pointer interpreter will transition from the NORM
state into the NDF state.
— Following three consecutive superframes with all ones in the V1 bytes and V2 bytes, the pointer interpreter will
transition from the NORM state into the AIS-V state.
— When operating in the 8 of 10 mode (VT_8ORMAJORITY = 1 (
Table 194 on page 164
)), if 8 of the 10 I and D
bits are correct for a pointer decrement on the incoming V1 bytes and V2 bytes, the pointer interpreter will tran-
sition 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 V1 bytes and V2 bytes, the pointer interpreter will transition from the
NORM state into the DEC state.
— When operating in the 8 of 10 mode (VT_8ORMAJORITY = 1), if 8 of the 10 I and D bits are correct for a pointer
increment on the incoming V1 bytes and V2 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 V1 bytes and V2 bytes, the pointer interpreter will transition from the NORM state into the INC state.
I
The pointer interpreter will transition into the INC state based on the following conditions:
— When operating in the 8 of 10 mode (VT_8ORMAJORITY = 1), if 8 of the 10 I and D bits are correct for a pointer
increment on the incoming V1 bytes and V2 bytes, the pointer interpreter will transition into the INC state. Oth-
erwise, if 3 of the 5 I bits and 3 of the 5 D bits are correct for a pointer increment on the incoming V1 bytes and
V2 bytes, the pointer interpreter will transition into the INC state.
I
The pointer interpreter will transition out of the INC state based on the following conditions:
— If NDF is enabled on the incoming V1 bytes and V2 bytes, the pointer interpreter will transition from the INC
state into the NDF state.
— Following three consecutive superframes with all ones in the V1 bytes and V2 bytes, the pointer interpreter will
transition from the INC state into the AIS-V state.
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
INC state into the NORM state.
— Following any three consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
INC state into the NORM state.
— Following the number of consecutive invalid pointers programmed in bits VT_INV_NTIME[3:0], the pointer in-
terpreter will transition from the INC state into the LOP-V state.