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PDF M28946 Data sheet ( Hoja de datos )
| Número de pieza | M28946 | |
| Descripción | Transceiver | |
| Fabricantes | Mindspeed Technologies | |
| Logotipo |  |
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™
A CONEXANT BUSINESS
ZipWirePlus™ M28946 G.shdsl Transceiver
G.shdsl Dual-Bearer Multi-Mode Transceiver
M28946
Two Full-Rate T1/E1 Payloads
Over a Single G.shdsl/HDSL2/SDSL Link
Dual-Bearer Operation
The M28946 includes two independent full-rate T1/E1
interfaces, capable of simultaneously carrying two sepa-
rate time-synchronized pulse code modulation (PCM)
data streams over a single twisted pair. Utilizing
advanced 32-level pulse amplitude modulation (PAM); the
M28946 operates at speeds up to 4640, or twice the
normal G.shdsl rate, enabling operators to double their
line utilization at distances of up to 7,000 feet or 2KM.
The M28946 offers all of the features provided by the
M28975 multi-mode transceiver including multi-pair
operation and guaranteed interoperability with legacy
systems including HDSL2, SDSL, and Mindspeed’s
AutoBaud™ software.
Multimode Operation
The M28946 DSL solution not only complies with the ITU
G.shdsl standard, it also supports the optional enhanced
performance asymmetrical PSD (EPAP) modes of opera-
tion. In addition, it complies with the ANSI HDSL2 stan-
dard (ANSI T1.418) and delivers interoperability with
Mindspeed Technologies’™ market-leading ZipWire trans-
ceivers through operation in 2B1Q multi-rate mode. The
2B1Q mode supports AutoBaud for SDSL interoperability,
rate optimization and fast connect times, as well as
standards-based HDSL operation. All of these modes are
supported by a single hardware circuit (i.e., one trans-
former, crystal and hybrid for all modes) and can be
configured in real-time via software control.
> KEY FEATURES
> 2 independent full-rate
PCM ports for
simultaneous operation
> Double the throughput
per copper pair of
other solutions
> Reliable operation at 4640
Kbps up to 7,000 or 2KM
> Multi-mode operation
> Low-power consumption
> Highly integrated solution
> Embedded microprocessor
> Interoperable with
ZipWire 2B1Q transceivers
including AutoBaud
Embedded Microprocessor
The M28946 chipset includes an embedded micro-
processor and a full suite of software that facilitates
faster and simplified development of systems that
comply with all applicable ITU, ANSI and ETSI standards.
The embedded microprocessor and software handle the
extended operations channel (EOC) processing and many
other functions often delegated to an external host
controller in competing solutions. This greatly reduces
software-porting efforts and eliminates real-time
processing requirements for an external host controller.
Flexible Framer
The M28946’s integrated framer includes fully featured
UTOPIA Level 2 and PCM interfaces. The UTOPIA interface
includes ATM TC-layer processing. The framer automati-
cally extracts and inserts DSL overhead (i.e., EOC, indi-
cator and Z-bits, CRC, sync word, etc.) and passes it on
to the embedded microprocessor. All G.shdsl and HDSL2
frame formats and EOC messaging protocols are
supported, as well as other non-standard SDSL frame
formats, including framer bypass mode.
>
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| PDF Descargar | [ Datasheet M28946.PDF ] | |
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