User's Manual

Radio Operation
Crescendo UHF Half-Duplex User Manual Page 26 of 78
 Repeaters in Network: The maximum number of repeaters through which a packet must go before
reaching its destination. Note that depending on network topology, this may be less than the total
number of repeaters in the network. This parameter should be set the same for all units in the
network. The repeaters in network setting can be configured between 0 and 65535.
 Max Packet Size: This is the maximum number of bytes of payload a packet will have. This
parameter should be set the same for all units in the network. The max packet size can be
configured between 0 and 4096 bytes. Setting Max Packet Size too low may cause fragmentation of
data transmitted over the air, negating the effect of Packetiser Timers (see section 4.3.2). However,
reducing Max Packet Size may reduce latency and improve throughput in a network with repeaters.
5.4 Network Architecture
5.4.1 Network Topology
The Crescendo has few restrictions on network topology, as there are no time division synchronisation
requirements. An example of a tree network topology is given below to help illustrate network concepts.
TREE NETWORK
A Crescendo network consists of a set of sub-networks (subnets). Each subnet has a single base or repeater
and any number of remotes.
1. Base subnet: The root of the tree, containing a unit not configured as a store-and-forward repeater.
2. Repeater subnet: A branch of the tree, containing a unit configured as a store-and-forward repeater.
These two types of subnet are shown in Figure 5.
Repeater Subnet
Base Subnet
Store-and-forward
Repeater
Base
Remote 2
Remote 4
Remote 3
Remote 1
Figure 5: Crescendo tree network topology