PSB4596V3.1 Просмотр технического описания (PDF) - Siemens AG
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PSB4596V3.1 Datasheet PDF : 27 Pages
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PSB 4595 / PSB 4596
Analog Line Interface Solution
1
Overview
Overview
ALIS V3 is a chip set used to connect analog phone lines to digital equipment such as
fax machines. Its technology and design make it especially suitable for use throughout
the world in:
• V.34 modems
• V.90 modems
• Fax machines
The ALIS V3 chip set is an ideal front end for modems and fax machines because these
pieces of equipment have to convert digital information into analog signals and vice
versa for communications via telephone lines. ALIS V3 bridges the gap between a digital
data pump and an analog phone line.
Reliability in digital processing is much better than in analog communications. The new
design of the ALIS V3 chip set has transferred processing that was previously done on
the analog side across to the digital part. Digital filters ensure great precision and
virtually no fluctuation. They also provide maximum autonomy between the filter blocks.
Many manufacturers are concerned that when standards change, they will have to
update the hardware. The ALIS V3 chip set removes this concern by integrating as many
setting options as possible on the digital side in the form of software algorithms. Should
standards change, all that equipment manufacturers need to do to modify their
equipment is download or enter new coefficients. For example, V.34 sampling rates,
including 16 kHz, are fully programmable.
The use of digital filter processing in combination with software algorithms ensures
excellent transmission performance and adaptability. The ALIS V3 chip set is adaptable
worldwide. International coefficient sets can be downloaded to the ALIS V3 chip set to
comply with all specifications throughout the world.
Previous equipment had to operate in conjunction with external components in order to
comply with local stringent requirements for communications equipment. One of these
requirements can be for isolation between the analog and the digital signals for example.
In the past, this was achieved using transformers, but they were awkward and heavy.
They were especially a problem on PC Cards in notebooks. ALIS V3 has built-in isolation
in the interface between digital and analog signals. In this overview, this is referred to as
the “capacitor interface”. The capacitor interface (patents pending) is an effective, light-
weight solution which isolates digital from analog signals without a transformer. This also
allows very flat frequency response over the entire voice band even at low frequencies.
Semiconductor Group
4
Product Overview 06.98
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