User's Manual

Radio Operation
Crescendo VHF Half-Duplex User Manual Page 27 of 74
5.4.2 Network Address
The network address is a high level address used to differentiate between co-located networks. For a unit to
send to or receive from another unit, their network addresses must match. A co-located network should not
be confused with a base or repeater subnet (see section 5.4.1)
Figure 6 shows an example of two co-located networks. In this example all units that are a part of network A
should have the same network address, and all units in network B should share a different network address.
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.
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