Data Sheet
June 2002
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
439
Agere Systems Inc.
19 VT/TU Mapper Functional Description
(continued)
5-9007(F)
* This state diagram is based on the ETS 417-1-1 pointer interpretation state diagram (Figure B.1). Transitions of eight invalid pointers from the
INC, DEC, and NDF states into the LOP state have been added.
Figure 41. Pointer Interpretation State Diagram
I
The pointer interpreter will transition into the LOP-V 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
), then LOP-V will be declared.
— Invalid pointer values. If the number of consecutive superframes programmed in register bits
VT_INV_NTIME[3:0] (
Table 196
) are received with a pointer that is not a normal value, NDF, AIS-V, increment,
or decrement, then LOP-V will be declared. The SS bits contribute to an invalid pointer indication.
I
The pointer interpreter will transition out of the LOP-V state based on the following conditions:
— Following three consecutive superframes with all ones in the V1 bytes and V2 bytes, the pointer interpreter will
transition from the LOP-V state into the AIS-V state.
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
LOP-V state into the NORM state.
— The pointer interpreter
does not transition from the LOP-V state into the NDF state.
I
The pointer interpreter will transition into the AIS-V state based on the following conditions:
— Following three consecutive superframes with all ones in the V1 bytes and V2 bytes, AIS-V will be declared.
I
The pointer interpreter will transition out of the AIS-V state based on the following conditions:
— Following three new, consecutive, consistent, and valid pointers, the pointer interpreter will transition from the
AIS-V 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 AIS-V 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 AIS-V
state into the NDF state.
*
NORM
DEC
INC
NDF
AIS
LOP
FROM ALL STATES
8 INVALID POINTERS*
8 INVALID POINTERS
FROM ALL STATES
3 AIS INDICATIONS
3 NEW POINTERS
INCREMENT
INDICATION
DECREMENT
INDICATION
8 NDF ENABLE
NDF ENABLE
NDF ENABLE
NDF
ENABLE
NDF
ENABLE
NDF
ENABLE
3 ANY
POINTERS
3 ANY
POINTERS
3 NEW POINTERS
3 NEW POINTERS
3 ANY POINTERS
3 NEW POINTERS
8 INVALID
POINTERS