User's Manual

STAR 3000 Installation Manual
Mojix Incorporated
www.mojix.com
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17
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45
Confidential and Proprietary
EMUX INSTALLATION
eNodes frequently are deployed with eMuxes that can connect multiple eNodes to a STAR or to another
(upstream) eMux. The eMux amplifies and conditions RF signals from the STAR and provides DC power
to eNodes. This section describes the steps involved to install an eMux. eMuxes should be used either
when:
1. The insertion loss from long lengths of coaxial cables and eNodes is too high
2. The wired eNode system layout requires splitting the wiring to multiple wiring branches
Figure 10: Example Cabling Diagram for eNodes and eMuxes
About Insertion Loss
The STAR transmits a signal of +23 dBm. Insertion loss of terminated LMR240 coaxial cable at 915 MHz
is 7.5 dBm per 100 ft. Insertion loss of wired eNodes is 0.5 dBm. Input power level for an eMux must be
greater than -10 dBm. The input power level for an eNode must be greater than -5 dBm. In order to
increase the signal strength for longer cable runs or many eNodes strung together, an eMux must be