28335-BRF-001-B Datasheet, PDF (1/2 Pages) M/A-COM Technology Solutions, Inc. – 12-Port DS3/E3/STS-1 Line Interface Unit

12-Port DS3/E3/STS-1 Line Interface Unit
M28335
High-Density Electrical Line Interface
for Optical Networks
The M28335 is a 12-port line interface unit (LIU) which
includes integrated receivers and transmitters for use
in implementing digital loop carriers (DLCs), digital
subscriber line access multiplexers (DSLAMs), multi-
service access concentrators, and packet and ATM cell
switches. The device is ideal for use in time division
multiplex (TDM) switches and add/drop multiplexers
(ADMs) that are used to aggregate lower-speed electrical
network connections into higher-speed optical connections.
Proven, Robust Design
Based on the same design used in the industry’s first
multi-port LIU in 1999, each M28335 channel is composed
of completely separate transmit and receive sections
with a common reference clock and dedicated power
and ground connections that eliminate crosstalk. In addition
to providing breakthrough port density, the M28335 LIU
offers an industry-low 330 mW per port of power dissipa-
tion. It meets all International Telecommunications Union
(ITU), Bellcore and AT&T standards, features zero code
suppression encoders and decoders, and is supported by
Mindspeed’s complete line of software driver products
and a comprehensive evaluation module with all necessary
reference-design components.
High-Density Interface for Metropolitan
Area Networks
Mindspeed’s M28335 LIU device provides the industry’s
most efficient and economical solution for edge and core
access equipment such as ADMs for metropolitan optical
networks, to enable carriers to offer expanded services
> KEY FEATURES
> 12 separate T3/E3/STS-1 line
interfaces in a single package
> Parallel and serial
microprocessor interfaces
> Integrated B3ZS (T3) or
HDB3 (E3) encoders/decoders
with line code violation (LCV)
indication
> Per-channel transmit monitor
with external monitor points
and test function
> Programmable loss-of-signal
threshold
> Low power
such as DS3. In this application, asynchronous T3 frames
are mapped into synchronous SONET frames and can be
used to transport ATM or narrow-band voice and data
traffic time division multiplex (TDM) service. The M28335
LIU provides an ideal solution in this application because
it may be used on combined DS3/E3/STS-1 line cards
without changes to transformers or front-end circuitry.
Alternatively, it may be paired with the most suitable
framer and mapper ASICs for the intended service type.
Simple External Circuitry
The M28335 LIU includes 12 independent transceivers on
a single chip and only requires the addition of 1:1 coupling
transformers, termination resistors and supply bypass
capacitors to create a complete solution. It includes both
a parallel processor port and a serial processor port
(selectable via control mode pins) that allows each port
on the device to be independently configured using a
common control interface.
Optimum equalizer settings are automatically selected by
the device depending on configuration of an individual
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