A Commercial Implementation of IP over Satellite IPSAT

1
A Commercial Implementation of IP over Satellite
(IP/SAT)

• Brian Safigan
• Avtec Systems, Inc.

2
Terrestrial IP
Network(IP)
Client
Server
Client
3
IP/SAT
Satellite(Server)
Network(IP)
Client
Client
- or -
Network(IP)
Network(IP)
Client
Server
Satellite
Client
4
OSI Model
Application
FTP, SNMP, HTTP, TelnetCustom
7
Presentation
6
Higher
Session
5
Transport
TCP, UDP, SCPS-TP
4
Network
IP
3
Data Link
HDLC, ARP/MAC, PPP, ATM, CCSDS
2
Lower
Physical
Ethernet, T1, RF, Optical
1
5
Sample Terrestrial IP Network
Client
Server
TCP
TCP
Transport
IP
IP Gateway Router
IP Gateway Router
IP
Network
PPP
PPP
ARP/MAC
ARP/MAC
HDLC
HDLC
Data Link
Modem / Phone Line
Ethernet / CAT 5
Serial Port / T1
Physical
6
Sample IP/SAT Network
Client
Server
SCPS-TP
SCPS-TP
Transport
IP
IP Gateway Router
IP Gateway Router
IP
Network
ARP/MAC
?
?
HDLC
HDLC
ARP/MAC
Data Link
Ethernet / CAT5
Serial Port / T1
RF / Antenna
Physical
7
RF Data Link Characteristics

• Asynchronous bit lock requires a continuous
  bitstream at an approximate data rate
• Asynchronous bit lock requires sufficient bit
  randomization
• Noisy environment requires error correction

8
Existing Data Link Layers
9
New Data Link Layers
10
Data Link Formats
IP
IP
CCSDS
FH
R/S
R/S
FH
Fill Packet
FH
Fill Frame
R/S
HDLC /w FEC
S
Bit Stuffing
S
Bit Stuffing
S
S
S
S
S
S
S
S
S
S
S
S
S
R/S
S
R/S
S
R/S
11
Avtec PTP Design

• Based on PTP NT/2000/XP architecture
• Use 3rd-party Ethernet NIC for network interface
• Use Avtec Monarch/E/EX serial CCSDS hardware for
  RF interface

12
Ground-CCSDS Gateway Architecture
Avtec PTP IP Gateway Router
Network
CCSDS
ARP/MAC
Data Link
Ethernet NIC
Monarch Serial Interface
Physical
13
Ground-CCSDS GatewayBlock Diagram
Avtec PTP
Router
RF
NIC
Monarch
Ethernet
Serial Interface
14
Ground-HDLC Gateway Architecture
Avtec PTP IP Gateway Router
Network
HDLC/FEC
HDLC
Data Link
Serial / T1
Monarch Serial Interface
Physical
15
Ground-HDLC GatewayBlock Diagram
Avtec PTP
Router
RF
Monarch
Monarch
Serial / T1
Serial Interface