tmxf28155 ETC-unknow, tmxf28155 Datasheet - Page 386

• 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
17.6 Transmit Direction (Transmit Path to SONET/SDH Line)
All functions supported by TMUX in the transmit direction are summarized below:
17.6.1 Transmit Side Telecom Bus Interface
The TMUX transmit side drives a parallel clock (TLSCLK, pin AA2) and three sync signals (TLSSPE, TLSJ0J1V1,
and TLSV1; pins AB2, AB4, and AB3) onto the telecom bus. From these sync signals, the SPE mappers can deter-
mine when to drive data onto the bus. The TMUX receives an 8-bit data bus (TLSDATA[7:0], pins W2, W1, W3, Y4,
Y2, Y1, Y3, and AA4), and an odd/even (TLSPAR, pin AA3) parity signal from the telecom bus. The data consists of
the SPE for up to 3 STS-1s.
The parallel clock operates at 19.44 MHz for STS-3/STM-1 modes and at 6.48 MHz for STS-1 mode.
17.6.2 Transmit Path and Transport Overhead Insertion Diagram
The transmit block consists of two overhead insertion sections. The first section inserts the path overhead (POH)
bytes into the payload data to create an STS-3/STM-1/STS-1 SPE. After POH insertion, there is an MSP 1 + 1 pro-
tection switch on the payload. After the switch selection is made, the transport overhead bytes are added to the
SPE to generate a complete SONET/SDH frame.
386
Transmit side telecom bus interface
Path overhead access channel (POAC) insert
Path overhead insertion functions
MSP 1 + 1 payload switch
Transport overhead access channel (TOAC) insert
Section and line overhead insertion functions
Figure 28. Transmit Low-Speed Bus Interface Signals for STS-3/STM-1 Signals
TLSDATA[7:0]
TLSJ0J1V1
TLSSPE
TLSCLK
TLSV1
A1-1 A1-2 A1-3 A2-1
3 BYTES
A1
(continued)
3 BYTES
A2-2
A2
A2-3 J0-1 J0-2 J0-3 J1-1 J1-2 J1-3 V1-1 V1-2 V1-3
3 BYTES
J0
3 BYTES
J1
3 BYTES
V1
Agere Systems Inc.
May 2001
5-9009(F)