Large Radio Modem Network
The amount of data transferred in a local area data communications network exhibits a tendency of continuous growth. On the other hand, the average size of communi cations systems are increasing. Satel’s response to these market tendencies is the SATELLINE-3AS radio modems with Message Routing, a characteristic for networking radio modems within a system. Message Routing features a versatile radio protocol, which takes care of routing messages across a radio modem network. Communication is completely transparent, which makes Message Routing directly compatible for most user protocols. Even though the network can cover large areas with multiple hops and repeater stations, only one radio channel is required. Any radio modem in the network can act as a repeater station keeping infrastructure expenses low. Message Routing has two operating Modes to suit the various requirements of different users: Source Mode and Virtual Mode. Virtual Mode has the smallest possible overhead for fast operation identification. Source Mode uses a slightly longer header than Virtual Mode to enable more versatile network handling. In Source Mode it is possible to design failure handling features right in the network, and to use mobile stations.
Dual Band Version
The SATELLINE-3AS(d) modem is available also as a "Dual Band" version. The transceiver of the radio modem offers as an option two 2 MHz frequency bands, tuned at the factory with a maximum separation of 15 MHz between the highest and the lowest frequency. The radio modem can be reprogrammed to operate at any channel within those two bands.
Specifications:
|
Transceiver |
|
Frequency range |
370 - 470 MHz |
|
Channel spacing |
12.5 / 25 kHz |
|
Communication mode |
Half-duplex |
|
Transmitter |
|
Carrier power |
10 mW ... 1 W / 50 ohm |
|
Receiver |
|
Sensitivity |
-116 ... -110 dBm (BER < 10 E-3) |
|
Diversity |
> 60 dB /> 70 dB |
|
Data Modem |
|
Interface |
RS-232, RS-422 or RS-485 |
|
Interface connector |
D 15, female |
|
Data speed of RS interface |
1200 - 38400 bps |
|
Data speed of radio interface |
19200 bps (25 kHz channel) 9600 bps (12.5 /
20 kHz channel) |
|
Data formats |
Asynchronous data |
|
General |
|
Operating voltage |
+8 ... + 30 Vdc |
|
Power consumption |
1.8 VA typical (receive) 6.0 VA typical
(transmit) 0.05 VA typical (when DTR is "0") |
|
Temperature range |
Operating: -25 C ...+55 C (tests acc. to
ETSI standards), -40 C ...+75 C (absolute minimum / maximum). Storage:
-40 C … +85 C |
|
Antenna connector |
TNC, 50 ohm, female |
|
Construction |
Aluminum enclosure |
|
Size H * W * D |
137 * 67 * 29 mm |
|
Weight |
250 g |