SkyEdge II

System Introduction

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Agenda

System Introduction

System Entities

Network Topology

Network Architecture

Satellite Segment

System Capabilities

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SkyEdge II IntroductionSystem Introduction

SkyEdge II is a modular two-way satellite communication system

Allows connection between several remote terminals to the Internet/Extranet

or to each other

SE II system has three main components

The Hub, satellite/transponder and remote terminals

Supports two types of transmissions

Inbound are all the transmissions from the remote terminals to the HUB

Outbound are all the transmissions from the Hub to the remote terminals

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SkyEdge II IntroductionSystem Entities

SEII HUB

Inbound

(IB)

Outbound

(OB)

Satellite (Transponder)

Remote Terminals

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SkyEdge II IntroductionSystem Entities

Remote Terminal

In Door Unit (IDU) – VSAT

Out Door Unit (ODU) - Antenna Dish, Linear BUC and LNB

Hub

Center of the SEII system

Responsible for two main functions:

Manages & control the network elements

Aggregate & distribute IB & OB IP traffic

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SkyEdge II IntroductionNetwork Topology

SkyEdge II hub enables system VSATs to communicate via satellite links:

Internet/Intranet networking (VSAT-to-Hub).

Each other (VSAT-to-VSAT).

System development road-map offers three basic topologies:

Star (v6.0)

Star with Terrestrial Interface (v6.1)

Star with Mesh Interface (v6.2)

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Network TopologyStar Topology

Each VSAT has a Satellite Interface (SI) which enables it to communicate

throughout the Hub to the internet\intranet (single hop) or to another VSAT (double

hop)

Internet

Star Topology

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Network Topology Star + Terrestrial Interface

The system also enables each VSAT to have a Terrestrial Interface (TI) as an

add-on to the VSAT.

Terrestrial

Network

Internet

Star Topology + Terrestrial Interface

Dial-up, DSL, etc.

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Network TopologyStar + Mesh (v6.2)

In Mesh connectivity data is directly transferred between VSATs, while channel

allocation and network management is done via the Hub.

Internet

Mesh

Mesh

Star

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SkyEdge II IntroductionNetwork Architecture

The SEII hub consists of one up to five Network Segments (NS)

A NS is a subnetwork that manages three physical subsystems

Inbound Subsystem (IBSS)

Demodulates and Decodes the traffic coming from the VSATs (Inbound)

Outbound Subsystem (OBSS)

Multiplexes and Modulates the traffic towards the VSATs (Outbound)

Application Subsystem (AppSS)

Provides means to distribute traffic to or from the Internet/Intranet and

optional QoS services.

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SkyEdge II IntroductionNetwork Architecture (cont’d)

Radio Frequency Transceiver (RFT)

SEII supports C-band, Ext. C-band and Ku-band (Ka-band in the future)

SEII system uses L-band for both IB and OB

Hub Applications/Add-ons

Shared by all the NS

Includes:

Internet Page accelerator (IPA)

L-band to IF and IF to L-band converters

Network Management System (NMS)

Facilitates management, control, configuration, monitoring and operation of the

system

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Network ArchitectureBlock Diagram

HUB

VSAT

ODU

IDU

Tx +Rx + ref

(L Band )

VSAT

ODU

IDU

Tx + Rx +ref

(L Band )

Remote Unit

ODU

IDU

Tx + Rx + ref

(L Band )

Customer LAN

RFT

IBSS

NM

S

AppSS

Rx (L Band )Tx (L Band )

OBSS

HUB Applications \ Add -ons

NS1

NS2

NS3

NS4

NS5

Border Router

Internet / Intranet

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SkyEdge II IntroductionOutbound – General Description

Carries Unicast and Multicast data, VoIP traffic, synchronization information

for the return (Inbound) channel and network control traffic

The VSATs recognize and extract the traffic which is intended for them

It is based on DVB-S2 (EN 302 307) standard

Supports two operation modes CCM and ACM

Constant Coding Modulation (CCM)

MODCOD (modulation and FEC (Forward Error Correction)) is constant

Adaptive Coding and Modulation (ACM)

MODCOD (modulation and FEC) differ on a frame to frame basis

Modulation Schemes: QPSK, 8PSK, 16APSK and 32APSK

Enhanced FEC mechanisms

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SkyEdge II IntroductionOutbound – DVB-S2 ACM

8PSK 5/6

QPSK 2/3

8PSK 3/4

DVB-S2 ACM

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SkyEdge II IntroductionInbound – General Description

The IB channel carries

User traffic, VSAT initial logon, maintenance information and capacity requests

Based DVB-RCS standard (EN 301 790)

Uses (Multi-Frequency Time-Division Multiple Access) MF-TDMA

Reservation based access scheme

Reservation Only! No contention…

The IB burst allocation plan is broadcast within the DVB-S2 OB channel.

Modulation Schemes QPSK and 8PSK

Multiple Carrier types (CT)

A Carrier Type is a combination of one symbol rate and a mix MODCODs

Each CT has it own Time Slot (TS) Mapping structure

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SkyEdge II IntroductionInbound – Carrier Types

Carrier

Type

Symbol

Rate

MODCOD MIX

Modulation FEC Percentage

CT- 4 512 8PSK 3/4 100%

CT-3 256 QPSK 3/4 75%

QPSK 6/7 25%

CT-2 192 QPSK 3/4 100%

CT-1 128 QPSK 1/2 100%

Freq

Time

CT- 4

CT- 3

CT- 3

CT- 2

CT- 1

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System Capabilities

Up to Five Network Segments (NS)

32000 VSATs per Hub

Outbound capacity:

Up to 135 Mbps per NS

Up to 300 Mbps per Hub

Total Inbound capacity

Up to 75 Mbps per NS

Up to 150 Mbps per Hub

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Application Enhancements

Enhanced Data-Com & IP features for full flexibility: RIP1&2, IRDP, NAT,

DHCP, IGMP, VRRP, IP prioritization, ACL, etc.

Embedded TCP spoofing

Embedded VPN & traffic Encryption/Compression

Embedded Application Acceleration – HTTP/S, VPN, CIFS, NTLM, CRTP

VoIP – ATA, IP phones, VoIP GW, SSW, etc

Telecom Backhaul – GSM, CDMA, DCME.

IB QoS - DiffServ, MPN, VSAT priority

Optional OB QoS – Server

Optional Network Traffic Analyzer (NTA)

Support Prepaid IP

Support of external applications

Any commercial IP based applications

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VSAT Network Solutions

Air Traffic Control

Internet Access

ATM

Point of Sale (POS)

Corporate Communications

Corporate Telephony

Credit Authorization

E-learning

E-Voting

Global Area Networking

GSM Satellite Backhaul expansion

Interactive Distance Learning

Intranet/Extranet

Inventory Management

Kiosks/Internet Cafe

Military

Oil & Gas

Post Office

Corporate Telephony

Prepaid IP

Rural Telephony

SCADA/Line Monitoring

Transportable VSATs

Video Surveillance

Wi-Fi / Wi-Max hotspots

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Test Your Knowledge

1. Which topology is supported in SEII? ____________________________________

2. What is a MODCOD? ________________________________________________

3. What is the maximal number of Network Segments in the system? _____________

4. What is a Carrier Type? _______________________________________________

5. What is the IBSS function? _______________________________________

6. What is the AppSS function? ______________________________________

7. What is ACM? _______________________________________________________

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The End