ArcLight Hub User’s Guide
General System Description
1-16 1081006 Rev. 001
1.2.7 Hardware Subsystems
1.2.7.1 Network Elements
The network includes the following elements:
Hub Subsystem (HUB)
ViaSat Mobile Terminals (VMTs)
1.2.7.2 Hub Subsystem
The HUB Subsystem is the source of the broadband IP broadcast, and
the reception point for random access and continuous access CRMA
Return Channels.
The HUB Subsystem includes, but is not necessarily limited to the
following components:
Network Management System (NMS)
PCMA Hub Cancellation Equipment (optional)
Forward Link Manager (FLM)
CRMA Receiver and Return Channel Demodulators
Real-time Network Management System (RtNMS)
Monitor VMBR and Monitor Server
Support Server
Network Performance Test Server (NPTS)
Network Time Server (NTS)
Performance Enhancing Proxy Provisions (optional)
Web Caching Provisions (optional)
Public Network Interfaces
Host Earth Station
1.2.7.3 ViaSat Mobile Terminals
VMTs can consist of the following:
Airborne Antenna Subsystem; including dual LO LNB, PA and
TXB, 11.5” 3-axis tracking dish antenna, and antenna control
unit (ACU), and a VMBR
Maritime Antenna Subsystem; including single LO LNB, PA and
TXB, a 24” 3-axis tracking dish antenna, and antenna control
unit (ACU) with display, and a VMBR
Rail Antenna Subsystem; including dual LO LNB, PA and TXB,
a 3-axis tracking dish antenna, and antenna control unit (ACU),
and a VMBR
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