Interactive VSAT Equipment

Typical VSAT Characteristics
Supplier	Gilat/Spacenet		Hughes
Model	Skystar Advantage		Personal Earth Station/Integrated Satellite Business Network
Outbound data	64, 128, 192, 256, 512, 1024, 2048 kb/s		128 or 512 kb/s
Outbound access	S-TDM**		TDM
Outbound coding	rate 1/2 or 1/4 convolutional FEC (k=7)		rate 1/2 FEC
Outbound modulation	BPSK or QPSK		BPSK
Inbound data	9.6, 19.2, 38.4, 56, 64, 128 kb/s (DPSK) 38.4, 76.8 kb/s (MSK)		64, 128 or 256 kb/s
Inbound access	modified slotted ALOHA (random access) with Automatic Dedicated Access (reservation mode)***		TDMA
Inbound coding	rate 1/2 convolutional FEC (k=7)		rate 1/2 FEC
Inbound modulation	DPSK or MSK		BPSK
Transmit frequency		14.0 to 14.5 GHz	C band	Ku band
Receive frequency	3.70 to 4.26, 4.50 to 4.80 GHz	10.9 to 12.75 GHz in 3 bands	C band	Ku band
Hub
Antenna diameter	11 m	5.6 or 7.2 m	5.6 to 9 m
Tracking
HPA	75 W TWTA
Noise temperature
IF	70 ± 18 MHz or140 ± 36 MHz
Frequency control
Pilot
Uplink power control
Capacity	up to 8000 remote ports
Hub Interface
Hub port rates	110 b/s to 256 kb/s		to 19.2 kb/s asynch, 1.2 to 64 kb/s synch
Number of hub ports	up to 48 X.25 ports up to 12 Token Ring or Ethernet ports up to 60 voice ports
Hub port types	RS-232, RS-422, Token Ring, Ethernet, telephony		RS-232, RS-422, V.35, 4-wire
Protocols	SDLC, X.25, Token Ring, Ethernet
Indoor Unit
Ports	2, 4 or 8		32 with multiport option
Data rates	50 b/s to 64 kb/s		to 19.2 kb/s asynch, 1.2 to 64 kb/s synch, Ethernet 10 Mb/s, Token Ring 4/16 Mb/s
Port types	RS-232, Token Ring, Ethernet, telephony		RS-232, RS-422, V.35, RS-530, Ethernet (UTP, coaxial), Token Ring (Type 1, Type 3), RJ-11, 4 wire E & M
Protocols	X.3/X.28/X.29, X.25 (SVC and PVC), TNPP, T3POS, SNA/SDLC (PU2.0, PU4.0, PU2.1), BSC 3270, BSC 2780/3780, Ethernet (IEEE 802.3), Token Ring (IEEE 802.5), TCP/IP over LAN (IP router over MAC, TCP gateway), SNA over LAN (LLC/TR, LLC/Ethernet)		SDLC, X.25, Burrough's Poll Select, BSC 3270, TINET, Bit and Byte Transparent, HASP, DDCMP, Frame Transparent, X.3/X.28 PAD, Broadcast, Ethernet, Token Ring, Transparent Bridging and others
Telephony subscribers
Telephony interfaces
Signalling	FXO, FXS
Speech coding	proprietary
Speech coding rate	4.8, 6.4 kb/s
Fax
Fax modem rate	2.4, 4.8 kb/s*
Data modem rate
Dimensions	40 (d) x 6 (h) x 30 (w) cm		15 x 48 x 41 cm
Outdoor Unit
Antenna diameter	1.8 m	0.95, 1.2 m	1.8, 2.4 m	0.75, 1.0, 1.2, 1.8, 2.4 m
HPA			2, 5 W	0.5, 1.0, 2 W
Noise figure
IF	950 - 1450 MHz
Dimensions

* optional, ** statistical TDM (this is the same as the TDM used by other TDM/TDMA VSAT manufacturers, but Gilat/Spacenet use a different name), *** this is a proprietary hybrid of FDMA and Slotted Aloha TDMA

Typical VSAT Characteristics (continued)
Supplier	Indra Espacio	NEC
Model	Arcanet	Nextar-V
Outbound data		64, 128, 256, 512, 768, 1536, 2048* kb/s
Outbound access	BLQS-CDMA	TDM
Outbound coding		rate 32/75 FEC, viterbi decoding
Outbound modulation		BPSK/QPSK
Inbound data		64, 128, 256* kb/s
Inbound access	BLQS-CDMA	AA/TDMA
Inbound coding		rate 1/2 FEC, viterbi decoding
Inbound modulation		BPSK/QPSK
Transmit frequency		5.925 to 6.425 or 5.850 to 6.350 GHz	14.0 to 14.5 GHz
Receive frequency		3.700 to 4.200 or 3.625 to 4.125 GHz	10.95 to 11.20, 11.45 to 11.70, 11.70 to 12.20, 12.25 to 12.75 GHz
Hub
Antenna diameter		4.5 to 11 m
Tracking
HPA		10 W to 1 kW	6 W to 1 kW
Noise temperature		55 K	180 K
IF
Frequency control
Pilot
Uplink power control
Capacity
Hub Interface
Hub port rates		50 bps to 64 kb/s
Number of hub ports		36 max
Hub port types		RS-232, V.35, EIA-530, IEEE 802.3 (10base5)
Protocols		Frame Relay, TCP/IP (IP Router), X.25, SNA/SDLC, X.3, PAD, BSC 3270/3780
Indoor Unit
Ports		2 or 4 (16 max with expansion IDUs)
Data rates		50 bps to 64 kb/s
Port types		RS-232, V.35, EIA-530, IEEE 802.3 (10base5)
Protocols		Frame Relay, TCP/IP (IP Router), X.25, SNA/SDLC, X.3, PAD, BSC 3270/3780
Telephony subscribers
Telephony interfaces
Signalling	DTMF
Speech coding	G.278 and TIA IS-54 VSELP
Speech coding rate	16 kb/s (G.728) and 8 kb/s (VSELP)
Fax
Fax modem rate	2.4 kb/s
Data modem rate	2.4, 4.8 kb/s
Dimensions
Outdoor Unit
Antenna diameter		0.95, 1.2, 1.8, 2.4 m
HPA		3.3, 20 W	0.5, 1, 2 W
Noise figure		60 K	140 K
IF
Dimensions

Typical VSAT Characteristics (continued)
Supplier	STM	TSAT
Model	X.Star (TXR-3000)	TSAT 2000
Outbound data	64, 128, 256, 512, 1024, 1544 kb/s	300, 600 1200 b/s	2.4, 4.8 kb/s
Outbound access	TDM	TDM
Outbound coding	rate 1/2 FEC	rate 1/2	rate 1/2, 3/4, 7/8
Outbound modulation	burst BPSK	Trellis encoded 4FSK	2-4PSK
Inbound data	96, 192, 384 kb/s	300, 600 1200 b/s	2.4, 4.8 kb/s
Inbound access	FA/TDMA, slotted Aloha contention, dynamic allocation, slotted Aloha with dynamic bandwidth allocation	TDMA or modified slotted ALOHA
Inbound coding	rate 1/2 FEC	rate 1/2	rate 1/2, 3/4, 7/8
Inbound modulation	BPSK	Trellis encoded 4FSK	2-4PSK
Transmit frequency	14.0 to 14.5 GHz	14.0 to 14.5 GHz
Receive frequency	12.5 to 12.75 GHz	10.95 to 11.75 GHz and 12.5 to 12.75 GHz
Hub
Antenna diameter		1.2, 1.8, 2.4 m
Tracking		none
HPA
Noise temperature
IF	70 or 140 MHz
Frequency control
Pilot
Uplink power control
Capacity
Hub Interface
Hub port rates
Number of hub ports		2 (RS 232) + 1 (X.25)
Hub port types		RS 232, RS 422/485
Protocols		asynch, X.25, Hayes AT
Indoor Unit
Ports	5 - 17	2 (RS 232) + 1 (X.25)
Data rates	to 64 kb/s	110 to 9600 bps
Port types	RS 232C, X.21, V.35	RS 232, RS 422/485, X.25
Protocols	X.25, X.3/X.28/X.29, SNA/SDLC, BSC, asynch, ALC, DDCMP, HDLC, digitised voice, ADCAP, synch, TCP/IP, fax, 3201, transparent, Ethernet 802.3	asynch, X.25, Hayes AT
Telephony subscribers		n/a
Telephony interfaces	4W E & M, 2W loop start (OPX or SLT)	n/a
Signalling		n/a
Speech coding		n/a
Speech coding rate	7.2, 9.6, 12, 14.4, 16 kb/s	n/a
Fax	Group 3	n/a
Fax modem rate	2.4 to 9.6 kb/s	n/a
Data modem rate		n/a
Dimensions	46 (w) x 53 (d) x 18 (h) cm	46 (h) x 17.5 (w) x 19 (d) cm
Outdoor Unit
Antenna diameter	1.2, 1.8, 2.4 m	0.55, 0.9, 1.2 m
HPA	1, 2, 4 W SSPA	0.1, 0.5, 1 W
Noise figure	2.2 dB
IF	950 to 1450 MHz
Dimensions		6 (h) x 9 (w) x 16.5 (d) cm

Typical VSAT Characteristics (continued)
Supplier	TSAT			ViaSat
Model	TSAT 2100			SkyRelay
Outbound data	2.4 - 9.6 kb/s	14.4 kb/s	16.8 kb/s	64, 128, 256 kb/s
Outbound access	TDM
Outbound coding	rate 1/2	rate 3/4	rate 7/8	rate 1/2 convolutional
Outbound modulation	O-QPSK			BPSK, QPSK, CPFSK
Inbound data	2.4 - 9.6 kb/s	14.4 kb/s	16.8 kb/s	64, 128, 256 kb/s
Inbound access	TDMA or modified slotted ALOHA
Inbound coding	rate 1/2	rate 3/4	rate 7/8	rate 1/2 convolutional
Inbound modulation	O-QPSK			BPSK, QPSK, CPFSK
Transmit frequency	14.0 to 14.5 GHz			5.925 to 7.025 GHz	14.0 to 14.5 GHz
Receive frequency	10.95 to 11.75 GHz and 12.5 to 12.75 GHz			3.7 to 4.8 GHz	10.95 to 12.75 GHz
Hub
Antenna diameter	1.2, 1.8, 2.4 m
Tracking	none
HPA
Noise temperature
IF				70 ± 18 MHz, 140 ± 36 MHz optional
Frequency control				100 kHz steps
Pilot
Uplink power control
Capacity
Hub Interface
Hub port rates				2.4 to 38.4 kb/s asynch 4.8 to 64 kb/s synch
Number of hub ports	2 (RS 232) + 1 (X.25)			up to 24 per Network Access Module
Hub port types	RS 232, RS 422/485			RS-232, V.35 optional, RS-530 optional, LAN
Protocols	asynch, X.25, Hayes AT			SNA/SDLC-PU type 2 and 2.1, 2780/3780 BSC, X.25, asynch (X.3, X.28, X.29), IP routing
Indoor Unit
Ports	2 (RS 232) + 1 (X.25)			6 (14 with optional port expander card)
Data rates	110 to 9600 bps			1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 56, 64, 128 kb/s
Port types	RS 232, RS 422/485, X.25			RS-232C, V.35, RS-449, V.11
Protocols	asynch, X.25, Hayes AT			SDLC 3270/5250, X.25, X.3, X.28, X.29, 3270 BSC, 2780/3780 BSC, 10Base T, 10Base 2, IP
Telephony subscribers	n/a			n/a
Telephony interfaces	n/a			n/a
Signalling	n/a			n/a
Speech coding	n/a			n/a
Speech coding rate	n/a			n/a
Fax	n/a			n/a
Fax modem rate	n/a			n/a
Data modem rate	n/a			n/a
Dimensions	46 (h) x 17.5 (w) x 19 (d) cm			9.5 (h) x 43.5 (w) x 38.7 (d) cm
Outdoor Unit
Antenna diameter	0.55, 0.9, 1.2 m			0.95, 1.2, 1.8, 2.4 m
HPA	0.1, 0.5, 1 W			+34 dBm ± 1 dB	+29 dBm ± 1 dB
Noise figure
IF				950 to 1700 MHz
Dimensions	6 (h) x 9 (w) x 16.5 (d) cm