TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet
May 2001
408
Agere Systems Inc.
18 SPE 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 36. Pointer Interpretation State Diagram
I
The pointer interpreter transitions into the LOP-TU3 state based on the following conditions:
—
Continuous NDF. If NDF (1001, 0001, 1101, 1011, 1000) is received for the number of consecutive frames
(determined by the value programmed in bits SPE_CNTDLOPCNT[1:0] (
Table 149
)), then LOP-TU3 is de-
clared.
—
Invalid pointer values. If the number of consecutive frames (determined by the value programmed in
SPE_CNTDLOPCNT[1:0]) are received with a pointer that is not a normal value, NDF, AIS-TU3, increment, or
decrement, then LOP-TU3 is declared.
I
The pointer interpreter transitions out of the LOP-TU3 state based on the following conditions:
—
Following three consecutive frames with all ones in the H1 and H2 bytes the pointer interpreter transitions from
the LOP-TU3 state into the AIS-TU3 state.
—
Following three new consecutive, consistent, valid pointers the pointer interpreter transitions from the
LOP-TU3 state into the NORM state.
—
The pointer interpreter
will not
transition from the LOP-TU3 state into the NDF state.
I
The pointer interpreter transitions into the AIS-TU3 state based on the following conditions:
—
Following three consecutive frames with all ones in the H1 and H2 bytes AIS-TU3 is declared.
I
The pointer interpreter transitions out of the AIS-TU3 state based on the following conditions:
—
Following three new consecutive, consistent, valid pointers the pointer interpreter transitions from the AIS-TU3
state into the NORM state.
—
Following the number of consecutive invalid pointers (determined by the value programmed in
SPE_CNTDLOPCNT[1:0]) the pointer interpreter transitions from the AIS-TU3 state into the LOP-TU3 state.
—
If NDF is enabled on the incoming H1 and H2 bytes, the pointer interpreter transitions from the AIS-TU3 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