TMXF28155 Datasheet, PDF (374/606 Pages) Agere Systems – TMXF28155 Super Mapper 155/51 Mbits/s SONET/SDH x28/x21 DS1/E1

TMXF28155/51 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet
May 2001
17 TMUX Functional Description (continued)
Receive TOAC—OH Parity. Even or odd parity can be inserted into the first bit of the MSB byte of the TOAC out-
going frame by programming TMUX_RTOAC_OEPINS (Table 117 on pag e113).
17.5.14 MSP 1 + 1 Payload Switch
The TMUX supports a payload 1 + 1 protection switch. In the receive direction, this occurs prior to pointer interpre-
tation. If TMUX_RPSMUXSEL1 = 1 ( Table 93), then the input receive data and clock are selected from the protec-
tion path: device pins RPSD155P/N (pins AD10/AE10) and RPSC155P/N (pins AC10/AD11), rather than from the
normal (working) path device pins, RHSDP/N (pins AF7/AE7) and RHSCP/N (pins AC7/AD8).
17.5.15 Pointer Interpreter
The STS-3/STM-1 pointer interpreter logic block performs all necessary functions to support STS-3/STM-1, as well
as STS-1, pointer interpretation. The pointer interpreter operates as one machine in STM-1 mode and as three
independent machines in STS-3 mode. The following features are implemented:
s The pointer interpreter consists of the following states:
— LOP: loss of pointer
— AIS: alarm indiction signal (all ones in H1 and H2)
— NDF: new data flag enabled (1001,0001,1101,1011, and 1000)
— NORM: normal (disabled NDF, normal pointer)
— INC: increment (inverted I bits)
— DEC: decrement (inverted D bits)
NDF ENABLE
INC
INCREMENT
INDICATION
3 NEW POINTERS
DEC
3 ANY
POINTERS
3 ANY
POINTERS
DECREMENT NDF
INDICATION ENABLE
3 NEW POINTERS
FROM ALL STATES
8 INVALID POINTERS*
8 INVALID
POINTERS
NORM
3 NEW POINTERS
3 ANY POINTERS
NDF ENABLE
NDF
NDF
ENABLE
FROM ALL STATES
3 AIS INDICATIONS
NDF
ENABLE
3 NEW POINTERS
LOP
8 INVALID POINTERS
AIS
8 NDF ENABLE
* 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.
5-9007(F)
Figure 26. Pointer Interpretation State Diagram
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