Description
The TMUX03155 STS-3/STM-1 (AU-4) multiplexer device provides three modes of operation: STS-3, STM-1 (AU-4), and STS-1 modes. In STS-3 mode, the TMUX03155 device provides all of the functions necessary to multiplex and demultiplex up to three STS-1 signals to/from a SONET STS-3 signal.

Features
■ Multiplexes three STS-1 signals into a SONET STS-3 signal.
■ Multiplexes three AU-3 signals into an SDH STM-1 (AU-4) signal via a TUG-3 construction.
■ Demultiplexes three STS-1 signals from a SONET STS-3 signal.
■ Demultiplexes three AU-3 signals from an SDH STM-1 (AU-4) signal via a TUG-3 deconstruction.
■ High-speed microprocessor interface configurable to operate with most commercial microprocessors.
■ Detects STS-3/STM-1 (AU-4) loss-of-signal (LOS) conditions.
■ Detects STS-3/STM-1 (AU-4) out-of-frame and loss-of-frame (OOF/LOF) conditions.
■ Provides an 8-bit bus interface at the STS-1/AU-3 rate.
■ Provides a bit serial, nibble-wide, or byte-wide interface at STS-3/STM-1 (AU-4) rate.
■ Provides STS-3/STM-1 (AU-4) selectable scrambler/descrambler functions and B1/B2/B3 generation/detection.
■ Accepts bit rate, nibble rate, or byte rate highspeed clocks (155.52 MHz, 38.88 MHz, or 19.44 MHz, respectively).
■ STS-3/STM-1 (AU-4) internal clock and data recovery. Meets type B jitter tolerance of ITU-T G.958. Accommodates 0.5 UI jitter up to 20 MHz. 155.52 MHz input reference clock for on-chip PLL. Has on-chip PLL for clock synthesis, requiring only one external resistor. No output clock drift in absence of data transitions once lock is acquired.
■ STS-1 termination mode.
■ –40 °C to +85 °C temperature range.
■ 208-pin, shrink quad flat pack (SQFP) package.
■ Complies with GR-253-CORE (12/95), G.707 (3/96), G.783(1/94).

Applications
■ SONET/SDH line termination equipment.
■ SDH path origination and termination equipment.
■ SONET/SDH add/drop multiplexers.
■ SONET/SDH cross connects.
■ SONET/SDH test equipment.