Dialogic IMG 1004 - Manual (Page 107)

IMG 1004 - Hardware Installation
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Power
See Connecting AC Power
Electromagnetic Interference
Electromagnetic Interference (EMI) is a type of radiation that can hinder your
system. Keep the following in mind when selecting cables:
 Dialogic requires that all cabling with the exception of the power cord be
shielded. Shielded cable will prevent outside electrical interference and will drain
off any induced current.
 Twisted wire reduces induction, and thus interference, from one wire to the
other. Varying the length of twists reduces the potential for signal interference
between pairs.
 Twisted pair wiring is available in various thicknesses. Thicker cable covers
longer distances and provides better sound quality but it is more expensive.
Channel Service Units
A Channel Service Unit (CSU) connects a digital phone line (T1, E1) from the phone
company to a digital communications device. CSUs are required between all
telecommunication ports and the network to provide necessary linking capabilities
such as:
 Line conditioning for long haul transmissions
 Remote loopback
 Equalization
 Regeneration and monitoring of digital signals
 Digital circuit testing
 Protection from outside lines
Electrostatic Discharge Protection
Electrostatic Discharge Protection (EDP) must always be used. Electrostatic
Discharge (ESD) protective straps, shoes, or mats must be used when working with
electronic components.
Electrostatic discharge from your body can damage
integrated circuits during installation.