Microwave Data Systems EL805, Руководство по установке и эксплуатации

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MDS 05-2708A01, Rev. B MDS TransNET 900 I&O Guide 47
Simple Extended SAF Network
The following example depicts a two-level network utilizing a single Master
(M) and an Extension (X) radio. See
Figure 18 .
Invisible place holder
Figure 18. Simple Extended SAF Network
Networks: J and K
In this network, messages directed to Remotes in the “K” sub-network, will
be relayed through Extension radio X
j,k
to the K-Remotes. Any response
from a Remote in sub-network “K” will pass back through Extension radio
X
j,k
to the Master M
j
. Radios in sub-network “J” operate on the same set of
frequencies and sub-network “K” but with a different radio-frequency
hopping pattern.
In the SAF operation, the Extension radios are set to
MODE X
( Details page 32 ) and operate with a dual personality—50% of the time it
serves as a Remote station and 50% of the time as a Master for sub-network
Remotes.
Extended SAF Network
Below is an example of a multilevel network utilizing two repeaters—X
J,K
and X
K,L
. The example demonstrates the extensibility of the network. In this
case, messages directed to Remotes in the sub-network L will be relayed
through Extension radios X
J,K
and X
K,L
. Like the previous example, the
Extension radios will split their operating time equally between their Master
and Remote personalities. This multi-layered network can be extended
indefinitely without additional degradation in system throughput beyond that
initially incurred by placing the network in the SAF mode.
M
J
R
J
R
J
X
J,K
R
J
R
K
R R
K K
Sub-Network J
Sub-Network K