Microhard Systems IP-921, Operating Manual

Page: 83 / 173

© Microhard Systems Inc. CONFIDENTIAL 83
IP9xx Series
6.0 Configuration
Network Type (continued)
Point-to-Multipoint
Point-to-Point
Peer-to-Peer
Everyone-to-Everyone
PMP with ACK
Values
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 not send the data again (refer to the
PMP behavior described in the preceding Retransmissions section).
If, however, the Master does NOT receive an ACK from all
Remotes in the network, it 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.
This mode of operation is particularly well-suited to fixed PMP
networks when multipoint operation is required as is maximum
throughput.
The selected Network Type will effect the Radio Configuration
menu somewhat, i.e. If Point-to-Multipoint is selected for a Remote,
there is no menu item for a Destination Address as the destination
is - must be - the Master (Unit Address 1).
Keep in mind that the
Network Type determines the
path that data will take.
i.e. In a PMP system, the
data flows from the Master to
Remotes, and from Remotes
to the Master. If a ping to
Remote B was sent to
Remote A, it will not arrive as
the data cannot travel from
Remote to Remote. Similarly,
a ping to a Repeater from a
Remote will not arrive either:
the destination for a Remote
in a PMP system is the
Master - not a Repeater, even
though it appears in the data
‗path‘ to the Master.