User's Manual

Radio Operation
Crescendo UHF Half-Duplex User Manual Page 28 of 78
Base 1B
Remote 1B
Remote 1A
Remote 2A
Remote 2B
Network A
Network B
Base 1A
Figure 6: Co-located networks
When co-locating Crescendo networks it is important to observe the following:
 If the co-located networks operate on different Tx and Rx frequencies, RF interference will not
occur. This is the ideal situation.
 If the co-located networks share Tx or Rx frequencies, the networks must have different network
addresses. If they do not, units on one network could masquerade as units on the other network,
causing random errors including data loss and reception of erroneous messages.
 Even with a different network address, the networks can cause interference with each other. This
could cause retries, resulting in increased latency, and possible data loss if retry counts are
exhausted.
5.4.3 Store-and-forward Repeater
A Crescendo unit may be configured to operate as a store-and-forward repeater (see Appendix B.1). A store-
and-forward repeater can be used to extend the range of a network. It behaves as a combination of base and
remote unit in the following manner:
 If a packet is received over the air which is addressed to the repeater, the packet data will be
transmitted out the serial port.
 If a packet is received over the air which is not addressed to the repeater, but with a next hop
address equal to the repeater’s address, the packet will be submitted for retransmission.
 If a packet is received over the air which is addressed to the broadcast address, the packet will be
submitted for retransmission, and the packet data will be transmitted out the serial port.