Housekeeping
Unified Communications Over Satellite
Networks
BRKVVT-2602
Cisco/ifVW
wibmrfNetworkers
Housekeeping
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■ For many
customers the use of terrestrial connectivity for their voice and data services
is not an option. Even though satellite based implementation of Unified
Communications has become more frequent, formal best practice documents are not
readily available.
■ This session
fills this gap and covers the design and implementation of Unified
Communication systems over high delay networks. It discusses call agents,
voicemail, protocol selection, and general operation best practices associated
with such deployments.
Introduction
Prerequisites
This Session
Assumes Basic Knowledge of:
■ Cisco Unified
Communications Manager
■ Cisco Unified
Communications Manager Express
■ Call Signaling
Protocols (H.323, SIP, MGCP, SCCP)
■ Quality of
Service (Differentiated Services)
Introduction
Session Agenda
and Scope
■ Satellite Network
Overview
Satellite Orbits
Challenges of
non-terrestrial links
General Best
Practices for TCP Applications
■ Unified
Communications Deployment Models
Distributed Call Processing Centralized
Call Processing
■ IOS Device
Management over Satellite
General Best
Practices
■
 |
Satellites
are used to transmit video, data and voice to fixed or mobile receive stations
on the Earth
■ The primary use
of satellites is to transmit video — over 80% of all TV
signals worldwide touch a satellite at some point
■ Satellites have a
considerable advantage over other means of
delivery in point
to
multi-point
communications
Architecture shown is typical of data distribution, but could be TV to
home, mobile to ships or planes, etc.
Satellite
Network Overview
Orbit Types
■
Low Earth Orbit
(LEO)
 |
■
■
Medium Earth Orbit (MEO) Geosynchronous
Orbit (GEO)
GEO>
Low Earth Orbit
(LEO)
■ 200 to 2000 km (124 to 1240 nm) circular
orbit
|
|
|
Globalstar Coverage |
Space Shuttle (185-1000 km; 100-520 nm)
International Space Station (350 km; 210 nm) Iridium (780 km; 485 nm) — 66 satellites
Globalstar
(1,414 km; 848 nm) - 40 satellites
Iridium Constellation
Medium Earth
Orbit (MEO)
■ 2000 km to GEO
GPS (20,200 km; 12,120 nm) — 24 satellites ICO (10,390 km; 6,456 nm) — one satellite
■ Limited use for
communications satellites to date with only one company (ICO Inc.) launching a
satellite to this orbit
■ Orbit in a polar
or inclined orientation is heavily used for Earth observing satellites
(weather, observation and reconnaissance) as well as navigation systems (GPS
and Galileo)
Historical
Perspective—GEO
Arthur C Clarke
Proposed the concept of geostationary
communications satellites in 1945
