 |
|
 |
|
| INSAT MSS TERMINALS |
|
| INSAT MSS TYPE D SYSTEM |
| The small portable satellite terminal works with MSS transponder of INSAT for voice/data communication. The terminal was developed keeping its primary use for voice communication during disaster when other means of communication have broken down. It can be used from any location of India for emergency communications. |
| |
| FEATURES |
- The satellite terminal is portable and operates on built in battery
- The terminal is a small brief case size (373 X 194 X 70 mm)
- Terminal weighs around 5Kg including battery and antenna
- The system operates in DAMA (Demand Assigned Multiple Access) for satellite channel access
- Voice call between terminal to terminal and between terminal to local users on EPABX
- Easy antenna deployment
- User-friendly operation
|
| |
| SYSTEM DESCRIPTION |
Use of small portable terminal is possible because of the specialized MSS (Mobile Satellite Service) transponder in INSAT.
In this system a small portable terminal, of the size of a small briefcase weighing around 5kg (including battery and antenna) is used for communications.
The portable satellite terminal is served by a central Hub station which has a DAMA network manager. Calls could be made between any two satellite terminals or satellite terminal & hub.
The Hub Station is a C-band 6.1 M station. The transmit and receive IF is connected to Hub Modem and DAMA equipment that include a Network server and a switch.
In the DAMA system, a pool of satellite channels is kept at Hub station and assigned on demand basis to satellite terminals.
Two numbers of signaling channels are there in the system, one for sending request message by all satellite terminals sharing the carrier and another common channel for channel allotment to all satellite terminals from Hub station. |
| |
| SPECIFICATIONS |
| Transmit |
: |
2670-2690MHz |
| Receive |
: |
2500-2520MHz |
| Antenna polarization |
: |
LHCP |
| EIRP |
: |
22dBW min. |
| Frequency tuning step |
: |
10KHz |
| Receive G/T |
: |
Better than -8dB/K |
| Modulation |
: |
BPSK |
| Channel coding |
: |
Convolution coding, 1/2 rate (k=7) Viterbi decoding |
| Transmit RF bandwidth |
: |
20KHz |
| Voice compression |
: |
Standard AMBE Codec, 4.8 Kbps |
| MOS quality |
: |
Better than 3.5 |
| Package |
: |
Portable, and weigh less than 5kg |
| Size |
: |
373 x 194 x 70mm |
| Power supply |
: |
12 V Battery with 2.5hr min. talk time with provision of 230V AC adaptor |
| Optional |
: |
Solar power package |
|
| |
 |
| |
 |
|
|
|
|
|
|
