Wilan VIP 110-24, Operator'S Manual

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VIP 110-24 Operator’s Manual (rev E)
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the children, the receive channel is configured with the command “rf-from-parent”. For the child to
get attached,
the child receive channel must match one of the two NNP channels of the parent .
3.5 Channel Assignments
In a VINE network, multiple radios in the same geographic area may be transmitting simultaneously.
Without careful coordination this could generate interference between links. The
VIP110-24
capability of transmitting and receiving in different channels through its two antennas allows it to
optimize the channel assignment to avoid this potential interference.
The radio factory configuration sets the “outbound” and “inbound” channels to two non-overlapping
frequencies. For a generic VINE network with multiple repeaters, this approach, coupled with
directive antennas on antenna A, greatly reduces the potential for self generated interference (see
section 3.5.4). Even though this “channel plan” will work in any topology, there are some simpler
networks where it may be desirable to use a different channel plan. The following sections describe
some simple topologies and discuss the channel assignment considerations. The table below each
topology shows the commands required, at each node, to set the channel assignments.
3.5.1 Point-to-point
In a point to point network one radio is configured as the root (with the antenna on port B) and the
other as a leaf (with the antenna on port A). If there is no external interference at either end of the
link, and it is desired to conserve bandwidth, you may configure the radios to use the same channel in
both directions. If there is interference on difference regions of the spectrum, at each end of the link,
configure the radios to use different channels in each direction. Since channels are allocated 2 MHz
apart this allows centering the RF transmission anywhere in the ISM band.
Root Leaf
rf-nnp-1 ch=c1 rf-from-parent ch=c1
rf-from-children ch=c2
3.5.2 Point-to-Multipoint
In the point to multipoint topology, the hub radio is configured as the root and receives from all its
children in a single “inbound” channel. All remote radios are configured as “Leaf”. The network
may be configured with up to two different outbound channels, which may or may not overlap with
the inbound channel. Configuring the root to send NNPs in two different outbound channels gives
each child the choice of two receive channels depending on the local conditions. If this second
outbound channel is not required, the transmission of NNP in a second channel may be disabled.
c2
Root
B
Leaf
A
c1