
TMXF28155 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet, Rev. 1
October 2000
254
Lucent Technologies Inc.
VT/TU Mapper Functional Description
(continued)
VT Pointer Interpreter (VTPI)
(continued)
I
The pointer interpreter will transition into the NDF state based on the following conditions:
— If NDF is enabled on the incoming V1 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 183), the pointer interpreter will transition 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 1s in the V1 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 183), 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 and V2 bytes, the pointer interpreter will transition from the NORM state
into the NDF state.
— Following three consecutive superframes with all 1s in the V1 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 181)), if 8 of the 10 I and D bits are correct
for a pointer decrement on the incoming V1 and V2 bytes, the pointer interpreter 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 V1 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 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 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 and V2 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 V1 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 and V2 bytes, the pointer interpreter will transition from the INC state
into the NDF state.
— Following three consecutive superframes with all 1s in the V1 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.