Vodavi Starplus DHS, Technical Manual

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DHS General Description 2-1
DHS General Description
System Technology
The DHS product line incorporates state of the art digital technology for voice switching
and call processing utilizing Pulse Code Modulation and Time Division Multiplexing
(PCM/TDM). The
DHS family is engineered to allow migration of the DHS digital terminals
and terminal accessories throughout the entire product line. ISDN-like, 2B+D technology
complements the system architecture and capabilities. On one industry standard twisted
pair, key telephones perform all system functions and voice communications. Some
additional features of the
DHS include:
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A non-blocking switch, with no loss or degradation of voice signals.
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Stored-Program Control (SPC), utilizing a 16-bit, 8 MHz microprocessor.
†
Memory consists of 512 KB of Read Only Memory (ROM) and 128 KB of Random
Access Memory (RAM).
When an analog device interface is required, a 2-Port Central Office (CO) Module may be
connected to any one digital station port. The 2B+D technology allows the
DHS to split
one digital key telephone port voice channel (B1) and the second voice channel (B2) to
provide two independent SLT-type device interfaces.
The 2-Port CO Module may be expanded with the 2-Port Analog Expansion (in the 2-Port
CO Module housing).
The 2-Port CO Module and 2-Port Analog Expansion each require one dedicated digital
station port.
System Components
KSU Components
The DHS platform is comprised of three key telephone models, an optional Direct Station
Selector (DSS) and a modular Key Service Unit (KSU) which houses the following KSU
components:
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3 x 8 Module
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Standard MOH/BGM Module
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6-Port CO Module
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Option Module
The application of analog devices in the
DHS
has the effect of two-to-one
port gain. For every single digital port used to interface a 2-Port CO Module/
Expansion, two analog ports are available.