Microhard Systems Nano IP Series Operating Manual page 73

6.0 Configuration
Defines the type of RADIO network (see Section 5.0)
In a point-to-multipoint (PMP) network, the Master broadcasts
data to all units, and all remote units send their data (ultimately)
to the Master.
A point-to-point (PTP) network involves a Master and a Slave
ALL modems in a network
(with 0 or more Repeaters between them).
must have the SAME
value for Network Type.
Peer-to-Peer (P2P) supports communication (through the Master) between 2 (typically remote)
units.
In an Everyone-to-Everyone (E2E) network, all units communicate with all other units, through
the Master. Note that this mode is very bandwidth-intensive.
Point-to-Multipoint with ACK is a configuration whereby the Network functions as a Point-to-
Multipoint, but the Retransmissions behave as a combination of PTP and PMP in that: If
retransmissions are set to 5 (for example) on the Master, and the packets it sends to the
Remotes result in an ACK being received by each of the Remotes in the network, the Master will
Keep in mind that the
not send the data again (refer to the PMP behavior described in the preceding Retransmissions
Network Type determines
the path that data will
section). If, however, the Master does NOT receive an ACK from all Remotes in the network, it
take.
will then revert to sending the data again, to the maximum number of Retransmissions specified,
for a period of one minute, after which time it will revert to behaving as it did originally.
i.e. In a PMP system, the
data flows from the
Master to Remotes, and
This mode of operation is particularly
from Remotes to the
operation is required as is maximum throughput.
Master. If a ping to
Remote B was sent to
The selected Network Type will effect the Radio Configuration menu somewhat, i.e. If Point-to-
Remote A, it will not arrive
as the data cannot travel
Multipoint is selected for a Remote, there is no menu item for a Destination Address as the
from Remote to Remote.
destination is - must be - the Master (Unit Address 1).
Similarly, a ping to a
Repeater from a Remote
will not arrive either: the
destination for a Remote
in a PMP system is the
As the name implies, this register specifies the ultimate destination
Master - not a Repeater,
for an Nano IP's data. Different network topologies dictate the
even though it appears in
the data ‗path' to the
configuration of the Destination Unit (address):
Master.
For a Remote in a Point-to-Multipoint network, this menu option will not appear: by definition,
the destination is the Master (UA = 1). For the Master in PMP, its Destination Unit (Address) is
65535—the broadcast address as it sends its data to all points.
In a Point-to-Point configuration, the destination is to be specified (for a Remote: the Master);
in the Master's Radio Configuration, specify the Unit Address of the Remote Unit to which it is to
send its data.
In Peer-to-Peer, the Remotes are configured with the target peer's UA as the Destination Ad-
dress, the Master with 65535; in Everyone-to-Everyone, the Destination Address for ALL units
is 65535 - the broadcast address - as every unit sends its data to every other unit (through the
Master). E2E is a very bandwidth intensive network topology.
© Microhard Systems Inc.
well-suited to fixed PMP networks when multipoint
CONFIDENTIAL
Network Type
Values
Point-to-Multipoint
Point-to-Point
Peer-to-Peer
Everyone-to-Everyone
PMP with ACK
Destination Unit
Values
1-65535
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