Capsat TT-3080A User Manual page 14

Description of the service Description of the service
The services supported
encompasses
•
High speed services (64 kbit/s)
•
64 kbit/s universal data
•
56 kbit/s universal data
•
Speech
•
3.1 kHz audio
•
IPDS (Inmarsat Packet Data Service)
•
Low speed services (2,4 kbit/s)
•
mini-M voice
•
mini-M fax
•
mini-M data
The mini-M services do have a lower tariff than the high speed
services as these are high quality audio or high speed data
services.
The 64 kbit/s UDI 64 kbit/s UDI (Unrestricted Digital Information) service
enables the bi-directional transmission of
terrestrial 64 kbit/s ISDN networks. The 56 kbit/s UDI
similarly used to make a connection to 56 kbit/s ISDN networks.
The Speech Speech and 3.1 kHz audio 3.1 kHz audio services make it possible to
establish high quality analog connections with quality equal to
terrestrial ordinary
networks/switches. The speech service is used for high quality
voice connections whereas 3.1 kHz audio can be used to transfer
analog signals between faxs and modems with an ordinary analog
2-wire interface. These services are transparent.
The IPDS service IPDS service is a packet data service where the tariff
depends on how many bits or packets of bits are transmitted. This
service is a better and cheaper choice for applications were there
is no need for continuously transmission of data in both direction
simultaneously.
Page Page 2-2 2-2
Hardware interfaces Hardware interfaces
by the Global Area Network
data to and from
56 kbit/s UDI service is
analog connections via digital
13Jun00 13Jun00