Specifications

to four times) of the whole network, quite probably making it unusable for the application. RipEX Auto-

speed feature allows to change the transmission data rate at the affected radios only, the rest of the

network may continue in full speed. Consequently the overall performance of network is maintained

practically at the same level while no additional investment is required. More over, the whole fix can

be done in minutes from behind a web-browser screen while sitting in your office.

Of course a similar scenario can be used right from the moment of planning a new network. The invest-

ment cost can be reduced by purposefully configuring the few „difficult“ radio links to a lower data rate.

The above scenarios are made possible by the unique capability of RipEX to automatically adjust its

receiver to the data rate of the incoming frame. Note that when an ACK frame is sent by the receiving

RipEX, it always uses the same data rate as the frame it acknowledges. The only limitation of this

feature is that all the frames have to have the same symbol rate and the same principle of modulation

(i.e. CPFSK or linear).

Modulation types which can be combined within one approval type (FCC , CE or CE-LBT):

2CPFSK & 4CPFSK & 8CPFSK with or without FEC

D2PSK & Pi/4DQPSK & D8PSK &16DEQAM with or without FEC

The improvement in system gain value using this technique may be more than 15 dB. Increasing gain

of antenna system by that value would be impractical, often impossible – the „difficult“ hops are designed

to use high-gain directional antennas from the beginning. Hence the Autospeed may make a radio

modem network the optimum choice in situations where it could not be economically feasible before.

16DEQAM

DQPSK

16DEQAM

Fig. 4.3: Autospeed - solution

Autospeed