Wilan VIP 110-24, Operator'S Manual

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VIP 110-24 Operator’s Manual (rev E)
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Root Repeater Leaf
rf-nnp-1 ch=c1 rf-from-parent ch=c1
rf-nnp-1 ch=c2 rf-from-parent ch=c2
rf-from-children ch=c4 rf-from-children ch=c3
3.5.4 Small VINE network with up to three repeaters
For VINE networks that are larger than the simple cases described above, but still with a small
number of repeaters, one simple approach to avoid self-generated interference is to allocate non-
overlapping channel to each parent. Within each “branch” (made up of a parent and all its one hop
children) the same channel would be used for both inbound and outbound transmissions. Since the
VIP can support up to 4 non-overlapping channels, this scheme works in networks consisting of a
root and up to three repeaters.
3.5.5 Generic VINE network with multiple repeaters
When a VINE network grows in complexity and includes multiple repeaters, the potential for self-
generated interference increases. The way to reduce or avoid this self-generated interference is to
allocate one channel to all outbound transmissions (from parents, through antenna B), and a separate,
non-overlapping channel, for all inbound transmissions (from children, through antenna A). Since
there may be some external local interference, this “channel plan” should also provide for a
“secondary” set of channels. An example of a channel plan is shown below. The default factory
configuration of the radios is set for this “channel plan”.
Outbound Inbound
Primary: 5 25
Secondary: 35 15
When this frequency diversity approach (non-overlapping inbound and outbound channels) is coupled
the directional nature of the antennas connected to port A, the potential for self generated interference
is greatly reduced.
The network in figure 3.1 shows why the inbound and outbound transmissions are assigned to
different channels. For example, repeater “4R” may perform an outbound transmission, through an
c4
Root
B
B
Rptr
A
c1
Leaf
A
c3
c2