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         Prepared for the SIMIHO W.G

            Rome, 31 August 2003
                Description of the Italian MoD Telemedicine Network
                           and related Satellite Terminals

1. Composition of the It MoD Telemedicine Network

The Italian MoD Telemedicine Network is presently composed by:
 one satellite terminal located at the field Hospital of PEC (Kossovo);
 one satellite terminal located at the I.D.I. Hospital in Tirana (Albania);
 one satellite terminal located at the Military Hospital Celio (Rome);
 one transportable terminal to be used when and where required (presently in storage);
 one Telemedicine Operation Centre (TOC) in Rome, designed to manage and to set up
  Telemedicine connections amongst the above mentioned terminals, to save satellite resources
  and to establish links with other military and civilian hospitals on the Italian and European

The above mentioned hospitals/centres are, moreover, provided with Internet connections and one
or more ISDN terrestrial channels, where available.

The Telemedicine Operation Centre (TOC) operates as a Hub of the resulting VSAT network.
The management of the VSAT terminals is performed at the TOC using two sub networks:
 the first, devoted to the transmission of the traffic (TDN);
 the second, dedicated to the signalling of data of interest (status of the stations, channel
  availability, allocation of frequencies, request to set up connections, etc);

The topology of the Traffic Data Network (TDN) is fully meshed. The network can be accessed
with DAMA/ PAMA modes of access , using the SCPC modulation.
The topology of the Signalling Network is star –meshed. A Computer (Desnet Control Centre
(DCC) ) at the TOC has the function of controlling all the network stations. In fact, the TOC
transmits according to a TDM scheme and the peripheral VSAT stations accesses the network
using TDMA methods, using the SCPC modulation..

The satellite terminals (designated as Data Earth Stations - DES) of the network, are composed, as
usual, of an Outdoor and an Indoor unit.
The Outdoor unit is constituted of an antenna (typically of 1,8 /2,4 Mt diameter) and a transceiver
system with a power adequate to the services to be transmitted.
The Indoor unit is composed of a rack of 19”, in which can be allocated up to 4 traffic modems, the
Service data modem, the portion of R.F. unit and the Electronic Control Panel (ECP) equipment,
which performs the switching of 4 data ports ( RS 449) and the control of the signalling channel.
The Indoor unit is moreover provided with a M&C equipment, based on a PC Pentium, which
controls the status of the station and manages the satellite bandwidth booking.
To carryout videoconference services, the Indoor unit is moreover provided with a CODEC H.320
and a video camera which can be fixed or motorised.

2. Satellite Resource and Coverage.

The It MoD Telemedicine network uses the Eutelsat Sesat Satellite positioned at 36,2° East..
10 MHZ bandwidth have been reserved on the satellite for Telemedicine functions.

The satellite coverage is indicated in the above figure.

3. Description of the satellite terminals

3.1 Fixed Data Earth Stations (DES) to support the MoD Telemedicine Network ( DESNET )

3.1.1 Introduction.

The It MoD Telemedicine network is a DAMA/PAMA satellite network, designed to support
variable rate data services up to 2 Mbps (according to the terminal configuration) in a dynamic
meshed or star network topology (single satellite hop).
It supports an integral session booking and bandwidth allocation system for fully automatic setting-
up and tearing down of point to point and multipoint links among its stations.
The following basic service categories can be performed. DXDS (full-duplex variable rate data session or point to point videoconference), which
 data sessions, allowing the transport of any class of synchronous data stream;
 point to point videoconference sessions, with a large variety of multimedia functions supported,
   such as file transfer, shared whiteboard, slide controller;
 LAN to LAN bridging up to 2048 kbps, supported by full duplex circuits between selected
   couples of Data Earth Stations (DESs). Point to multipoint chairman controlled videoconference, which is a point to multipoint
videoconference, carried out by using a single satellite carrier, shared among all the participants to
the session, with the minimum bandwidth requirement. Typical applications for such a service are
tele-education and low interactivity corporate conferencing. DVB Broadcast Video oriented to small end users, equipped only with COTS DVB
receivers and small satellite dishes. Main applications are in the tele-education service and in the
earth observation data distribution (service not yet implemented).
The network elements are VSAT class earth stations (DESs). One of the DESs may be configured
under software control to act as DESNET Control Center (DCC) to operate and maintain the whole
Every DES can support the session management functions. The DCC is additionally in charge of the
 automatic sessions scheduling and implementation;
 assignment of the allocated satellite bandwidth according to DES requests and reservation
 centralised network configuration, operation, monitoring and control;
 centralised billing system;
 auxiliary M&C ports for external equipment remote control.
The DCC configuration and operational data bases are dimensioned to support a maximum number
of 256 DESs and 256 contemporary sessions

3.1.2 Terminal Description
The DES terminal is physically composed by an outdoor unit and an indoor unit, including the
video subsystem.
The outdoor unit includes an offset antenna EUTELSAT approved and can be configured with a
range of RF equipment to support the required number of channels using the specified space
segment. Provision is made for Ku (12/14GHz) band operation through bent-pipe transponders.
The indoor unit integrates the PC-based MMI and the baseband equipment required to interface the
data sources to the satellite network.
The video subsystem is an independent roll-about equipment.
The traffic capability and the user interfaces can be fitted to the application needs.
The DES terminals are implemented in a fixed configuration or in a transportable configuration for
fast deployment.
The network architecture is composed by two logically overlapped sub-networks: the Traffic Data
Network (TDN) and the Service Data Network (SDN), both using the satellite carriers as
transmission media.
The TDN is characterized by a fully meshed topology with DAMA/PAMA access schemes,
employing continuous SCPC (Single Channel Per Carrier), variable bandwidth satellite channels.
The SDN is star-meshed with a designated DES configured as DESNET Control Centre (DCC). Its
aim is to support the internal message-based signalling system, required to manage the network
operation, relying on a dedicated internal via satellite signalling network, in order to provide self-
standing operation with no need of terrestrial or auxiliary networking support. It is based on a
Continuous TDM outbound carrier (DCC to DESs) and 1-4 TDMA inbound carrier (s) (DESs to
DCC), collision type Slotted-Aloha access protocol.
A centralized network Monitor & Control system allows complete supervision of the active stations
from a single DES designed as DCC.
DESNET is employed for Tele-medicine applications, since the time of the project SHARED
(Satellite Health Access for Remote Environment Demonstrator), started in 1996 by the Italian
MoD in co-operation with TelBios Company and the Italian and European Space Agencies (ASI -

3.1.3 Specifications
Detailed specifications of the DES terminal are summarised as Annex 1.


3.2.1 Introduction
The Ku-Band Transportable station provides an effective solution for fast deployment of a
low/medium power satellite station. It can be used in a wide range of applications: Video
Conference, LAN to LAN interconnection, Telemedicine, etc. In the trailer can be positioned a
1.8 m offset antenna Eutelsat approved, an high quality RF front-end, and an indoor 15units rack.
All equipments are transported over the trailer in waterproof containers.
Over the trailer there are the following main parts:
 Antenna
 RF case (it includes all RF outdoor parts)
 Indoor case (it includes the 15Units rack with different configuration)
 Video case (it includes a 17” colour monitor)
 Cable reels (100 meters cables)
 Courtesy hand hoist and tools for easy deployment of cases carried on the trailer

3.2.2 Characteristics
• Transmission Band 14 ÷ 14.5 GHz
• Receiving Band 11.700 ÷ 12.750 GHz
• 125 kHz step size
• 1 Traffic Channel IDR/IBS (2.4 kbps ÷ 5 Mbps)
• 1 DVB 2 (RL) or 6 (RH) Mbps)
• 1 Videoconference equipment (56 ÷ 384 kbps)
• LAN to LAN interconnection up to 6 Mbps
• Optionally the station can be inserted in the DESNET Telemedicine network
• Set up time (installation and network connection) less than 4 hours

3.2.3 Specifications
The detailed specifications are included as Annex 2

4. Final Consideration on terminals interoperability.

Interoperability is a difficult issue and has different levels, including medical equipment.
However, it is possible to state that, provided a Ku band satellite channel, the DES terminal,
operating in a stand alone configuration and equipped with its presently assigned traffic modems,
is interoperable with other Ku band terminals, operating in a similar configuration supported by
compatible traffic modems.

                                                                                      Annex 1

                   Data Earth Stations (DES) terminal Specifications

Main Features
• Fully-meshed network topology SCPC/DAMA schemes
• On-demand bandwidth-capacity assignment
• Assignment of the allocated satellite bandwidth according to DES requests and reservation status
• Centralized session accounting system
• Centralized network configuration, operation, monitoring and control ETS 300,161 compliant
• Local and remote control
• Auxiliary M&C ports for external equipment remote control
• Operating in Ku(12/14GHz) band .
• Up to 2 Mbps IDR/IBS traffic channel
• Up to 5 Mbps DVB channel ETS300421 and EN 301210 compliant
• Up to 384 kbps High quality video codec standard H320/H323 channel (H.261)
• Powered by Mains
• Fixed configuration implemented. (Transportable configuration can be provided; in the
   transportable configuration all the equipments are transported in waterproof containers over a
• Eutelsat type approved EA-V036

• Full-duplex variable rate data session
• Point to point videoconference
• Point to multipoint chairman controlled videoconference
• DVB Broadcast Video (not yet implemented )
• Video Conference;
• Tele-medicine;
• Tele-education
• DVB Broadcast Video
Other Services

- Traffic Network Type:      Mesh or Star SCPC DAMA
- Service Network Type:      Star TDM/TDMA
- BER Performance:       Better than 10-7
- Frequency Band:        Ku (optionally C, Ka)
- RF Output Power:      4 to 60 W (depending on the Services configured)
- Antennas:            1.8, 2.4 m (depending on the Services configured)
- Traffic Channels:
- IDR/IBS variable rate

- DVB variable rate
- Service Channel: 1
  -Application supported: Videoconference, H320/H323
- DES configuration: Fixed and Transportable
Signalling modem Specifications
- IF Frequency range: 50 to 180 MHz, 1 Hz Step Size
- Data Rate: 19.2 kbps
- Modulation type: QPSK
- Plesiochronous Buffer: 2 to 98 ms, in 2 ms steps
- FEC: Viterbi K=7: rate ½
- Operative Mode: Burst (DES toward DCC) Continuous (DCC toward DES)
Traffic modem Specifications
- IF Frequency range: 50 to 180 MHz, 1 Hz Step Size
- Data Rate: 2.4 kbps to 5 Mbps
- Modulation type: BPSK / QPSK
- Plesiochronous Buffer: 2 to 99 ms, in 2 ms steps
- FEC: Viterbi K=7: rate ½
- Reed Solomon: (126,112,7)
- Operative Mode: Continuous Mode
DVB modulator Specifications( not implemented yet)
- IF Frequency range: 50 to 180 MHz
- Data Rate: 55 kbps to 5 Mbps
- Modulation type: DVB/QPSK
- Operative Mode: Continuous Mode
Network Management
- Local Control: In each station (DES) the operating status is controlled through the local terminal.
- Remote Control: All the network is managed by a master station (DCC) through a dedicated
satellite service data network (SDN).

- Voltage: 90 ÷ 240 Vac
- Frequency: 47 ÷ 63 Hz

PHYSICAL (Transportable Configuration)
- Overall Trailer dimensions: 3910 x 1850 x 1890 mm (LxWxH)
- Weight: 1400 kg (typical)
- RF Case: 110 kg
- Indoor case (fully equipped): 118 kg
- Video Monitor Case: 30 kg

                                                                         Annex 2


Transmission band 14 ÷ 14.5 GHz
Receiving band       10.950 ÷ 12.75 GHz (according to adopted LNB)
Output power 4 to 60 W (depending on the service to be carried out)
Antenna Gain Tx 47.0 dBi @ 14.25 GHz
              Rx 45.5 dBi @ 11.95 GHz

Antenna Noise Temperature 10° EL        48 °K
                          20° EL        34 °K
                          30° EL        33 °K

Antenna polarization: Linear, Orthogonal

Traffic Channel : 1 IDR/IBS variable rate
                 1 DVBvariable rate ETS 300421 and EN 301210 compliant

VideoConference: H320/H323 channel

LAN to LAN: 1 channel up to 6 Mbps

Service Channel Number: 1 (if used in the DESNET network)

Set up Time (installation and network connection): < 4 hours

Maximum distance between indoor and outdoor:         100 m


Operating temperature: - 30 ÷ + 55 °C
Relative Humidity: up to 100 %
Storage:             -40 ÷ + 70 °C

Operating temperature:             0 ÷ + 40 °C
Relative Humidity :         < 95 % non condensing
Storage      :       -40 ÷ + 70 °C


        Voltage     90 ÷ 240 Vac
        Frequency   47 ÷ 63 Hz
        Power Consumption 500 W (typical)


Overall trailer dimensions [Length x Width x Height in mm]: 3910 x 1850 x 1890

Overall trailer Weight:     1400 kg (typical)
RF case         110 kg
Indoor case (full equip.)   118 kg
Video Monitor case           30 kg

Wind Loading
Operational: 80 km/h
Survival (STOW): 165 km/h