tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 374

• Manufacturer Part Number: tmxf28155
• Description: Tmxf28155 Super Mapper 155/51 Mbits/s Sonet/sdh X28/x21 Ds1/e1
• Manufacturer: ETC-unknow

155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
17 TMUX Functional Description
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
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 (
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:
* 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
374
INC, DEC, and NDF states into the LOP state have been added.
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)
8 INVALID POINTERS*
FROM ALL STATES
Figure 26. Pointer Interpretation State Diagram
LOP
INC
INCREMENT
INDICATION
3 NEW POINTERS
Table
POINTERS
8 INVALID
93), then the input receive data and clock are selected from the protec-
(continued)
POINTERS
3 ANY
8 INVALID POINTERS
3 NEW POINTERS
3 NEW POINTERS
(Table 117 on pag
8 NDF ENABLE
NDF ENABLE
NORM
POINTERS
3 ANY POINTERS
3 ANY
3 NEW POINTERS
NDF ENABLE
FROM ALL STATES
3 AIS INDICATIONS
e113).
ENABLE
NDF
DECREMENT
INDICATION
DEC
NDF
AIS
ENABLE
ENABLE
NDF
NDF
Agere Systems Inc.
May 2001
5-9007(F)