Specifications

First, packet A is broadcast from Radio 1.

Radio 2 receives Packet A and sends it to its COM. In the instant when it starts the reception of Packet

A, Radio 2 calculates (from information in the received packet header and from number of repeaters

in its own setting) the time delay which is needed for the delivery of Packet A through the repeater

(repeaters). When the response from the connected device arrives via COM (Packet B), the Radio 2

postpones its transmission for the delay.

Radio1

header

no Tx

RadioTx,Rx

Radio2

COM

Radio3REP

data

header A

Radio4

In the meantime, Radio 3 (Repeater) receives Packet A and repeats it to the radio channel immediately.

Radio 4 receives the Packet A and then Packet B and sends them both to the COM. Packet B is also

received by Radio 3 and immediately repeated. Whenever a radio receives a copy± of the same

packet during the calculated delay, it discards it as a repeated packet. Note that the picture does not

show all the packets at all the radios.

Repeater is configured in the Settings / Device / Operating Mode menu, for Radio 3 (left) and Radio 1,

2, 4 (right):

The delay period based on number of repeaters solves the collision between a repeated packet and a

possible response. When more than one repeater is used in a Bridge-mode network, collisions between

repeated packets from different repeaters may occur. These cannot be solved by simple delays, rather

a sophisticated anti-collision protocol is required. The RipEX Router mode is recommended to be used

in more complex networks with multiple repeaters. Nevertheless if certain conditions on signal coverage

(sometimes non-coverage) among repeaters, centre and remotes are met, the Bridge mode for a

polling-type application can be used. See the chapter Bridge mode

in RipEX Manual.

http://www.racom.eu/eng/products/m/ripex/ripex-detail.html

Channel access