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Products
VSATPlus II Terminal
Indoor Unit
The VSATPlus II indoor unit provides
the interface points for customer communication equipment and performs
the signal processing required for communication via a geosynchronous
satellite. The VSATPlus II chassis is a compact cabinet that
can be set on a desktop or mounted in a standard rack. The indoor
unit consists of a chassis with enclosed plug-in cards and power
supply(s).
The Modem Card, common to both terminal sets, is available in a
nonredundant configuration or for the VSATPlus IIe, an optional
redundant configuration. In all configurations, a chassis contains
all the plug-in cards and power supply modules. These plug-in interface
cards receive and transmit signals between the customer’s terrestrial
equipment (such as telephones, computers, fax machines, and/or video
equipment) and the outdoor unit. Additional terminals may be added
to provide space for additional interface cards.
Desktop VSATPlus II indoor unit contains
the following functional assemblies:
- Chassis with integrated power supply assembly
- Modem Card
- Interface cards
VSATPlus IIe chassis configured for nonredundant
operation contains:
The VSATPlus IIe has a 19-inch
rack-mountable chassis, which contains slots for up to:
- Ten interface cards
- One Modem Card
- One power supply
VSATPlus IIe Chassis Redundant configuration:
The
VSATPlus IIe has a 19-inch rack-mountable chassis, which
contains slots for up to:
- Ten interface cards
- Two Modem Cards
- Two power supplies
Modem Card
The VSATPlus II terminal uses
a four-phase burst modem with absolute FEC encoding and decoding.
The modulation technique is quadrature phase-shift keying (QPSK).
The modem incorporates the latest concepts in digital modem and
microprocessor control technology. It can be used with 70-MHz IF
satellite communications equipment to allow the simultaneous transmission
and reception of digital information via satellite. Users may select
the modem bit rate via software control in 16 kbps increments from
512 kbps to 10 Mbps (including FEC bits). Included as part of the
modem digital circuitry is the FEC (Forward Error Correction) circuitry.
Different user circuits may operate at different
FEC rates within the same node and network. This arrangement provides
a network operator with maximum flexibility for optimizing network
efficiency and performance.
To provide better BER performance, FEC is automatically
applied to the signaling channels as well as to the customer’s
traffic. Other features include:
- Automatic gain control (AGC)
- LPC
- Optional performance monitoring on live data
The Modem Card implements the common-signaling channel
that provides the interterminal signaling to support network reconfiguration,
terminal control, and demand-assigned operations. The Modem Card
also performs selected self-diagnostics, detects faults automatically
and initiates automatic switchover as needed.
Interface Cards
Various cards provide the interface
between the customer’s terrestrial equipment and the VSATPlus
II terminal (and ultimately, to the satellite network). Individual
plug-in cards connect voice, data, facsimile, and video signals
to meet specific user requirements. The Modem Card and all interface
cards are completely interchangeable between the VSATPlus II
and the VSATPlus IIe.
In other words, you can upgrade from a VSATPlus
II to a VSATPlus IIe by changing only your chassis:
no card changes are necessary. This feature allows the user to
reconfigure the network to best fit the traffic. Moreover, if
a new traffic requirement evolves, either an existing interface
card or a newly designed card can meet this new requirement.
VSATPlus II interface cards include:
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