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TMXF28155 Super Mapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Preliminary Data Sheet, Rev. 1
October 2000
88
Lucent Technologies Inc.
TMUX Functional Description
TMUX Introduction
The TMUX multiplexer block implements SDH/SONET-compliant, byte-interleave multiplexing/demultiplexing,
overhead insertion and termination, multiplex section protection (MSP) 1 + 1 switch capability, and serializer/dese-
rializer for 155.52 Mbits/s and 51.84 Mbits/s traffic.
As shown in Figure 15, High-Level TMUX Interconnect on page 93, the TMUX provides three modes of operation:
STS-3 mode, STM-1 mode, and STS-1 mode. In STS-3 mode, the TMUX implements the functions necessary to
multiplex and demultiplex up to three STS-1 signals to/from a SONET STS-3 signal. In STM-1
(VC-4) mode, the TMUX provides the functionality to multiplex and demultiplex up to three TUG-3 signals
to/from an STM-1(VC-4) signal. The device can also build/extract up to three AU-3 signals to/from an STM-1(VC-3)
stream. In STS-1 mode, the TMUX implements the functions necessary to interface a single STS-1 to/from an
external serial link.
On the high-speed side or line side, the block can be configured for either a 155.52 Mbits/s (STS-3/STM-1) or
51.84 Mbits/s (STS-1) serial data interface. On the low-speed side or tributary side, the TMUX provides a byte-
wide bus that can communicate with up to three STS-1/TUG-3/AU-3 devices at a 19.44 MHz rate. If single STS-1
mode is employed, the bus rate will be
6.48 MHz. The TMUX therefore provides complete multiplexing/demultiplexing to/from an STS-3/STM-1 signal for
up to 84 DS1, 84 JT1, or 63 E1 signals. In STS-1 mode, the TMUX provides multiplexing/demultiplexing for up to
28 DS1, 28 JT1, or 21 E1 streams. In STS-3/STM-1 mode, the TMUX from only one device is required. The TMUX
in other connected devices may be powered down to reduce consumed power. This architecture allows flexible and
modular growth in equipment capacity for both 51.84 Mbits/s and
155.52 Mbits/s links.
TMUX Features
I
Multiplexes three STS-1 signals into a SONET
STS-3 signal.
I
Multiplexes three VC-3 signals into an SDH STM-1 (AU-4) signal via a TUG-3 construction.
I
Multiplexes three VC-3 signals into an SDH STM-1 (AU-3) signal.
I
Demultiplexes three STS-1 signals from a SONET STS-3 signal.
I
Demultiplexes three VC-3 signals from an SDH STM-1 (AU-4) signal via a TUG-3 deconstruction.
I
Demultiplexes three VC-3 signals from an SDH STM-1 (AU-3) signal.
I
Provides STS-1 only mode for receive and transmit directions.
I
Provides complete functionality for SDH MSP 1+1 protection switching.
I
Detects STS-3/STM-1 loss-of-signal (LOS) conditions.
I
Detects STS-3/STM-1 out-of-frame and loss-of-frame (OOF/LOF) conditions.
I
Provides an 8-bit parallel bus interface that can accommodate up to three STS-1/AU-3s.
I
Provides STS-3/STM-1/STS-1 selectable scrambler/descrambler functions and B1/B2/B3 generation/detection.
I
Provides STS-3/STM-1/STS-1 pointer interpretation. Detects AIS-P and LOP
I
Complies with GR-253-CORE, T1.105, G.707, G.783, G.806, G.821, and ETSI 417-1-1.