User Guide: Technical Reference
SECTION 2
ioLink 4
SYSTEM COMPONENTS
PRELIMINARY
Customer Support (202) 333-7031
2-3
A spread spectrum, which spreads, modulates, demodulates, and despreads the user T1/E1 signal.
The modem board also contains an embedded microprocessor, which is used to control the link
configuration. You may adjust settings via a front panel keypad or an RS232 interface. Default values are
entered when the modem unit is manufactured. You may store configuration changes in non-volatile
memory or you can restore the original default factory settings. The non-volatile RAM stores the current
configuration settings and the firmware that controls the system; if there is a power loss to the unit, this
information will not be lost.
A power supply which powers both the modem unit and the RF unit.
A four-key keypad and a liquid crystal display (LCD) that is used to configure and monitor the system.
(All the settings in the configuration menu have default values that should be adequate for most
system setups.)
Five light-emitting diodes (LEDs) that indicate if the unit is transmitting and receiving normally or if
there is an error preventing the system from working properly.
Connections to the RF unit and Customer Premise Equipment (CPE).
Circuitry for Forward Error Correction (FEC) on
ioWave
’s T1 version only.
The modem unit is designed for indoor use in normal office or electronics equipment room conditions.
The suggested operational temperature range is from 0
o
C to +60
o
C. Provide adequate ventilation to
ensure that the unit stays well within the operating temperature range. The modem unit can operate in up
to 95% humidity (non-condensing). The modem unit may be stored in a temperature range of –40
o
C to
+60
o
C.
2.2 Intermediate Frequency Cable
The modem unit is connected to the RF unit via two coaxial cables called IF cables. These cables allow
the information to pass between the modem and RF unit and carry power to the RF unit from the power
supply in the modem unit enclosure. The maximum length of each IF cable is 500 feet. If longer cable
lengths are required, contact
ioWave
’s sales or customer support personnel. The maximum resistance
for this cable is 9 ohms.
2.3 RF (Outdoor) Unit Description
