Hardware and Connectivity 54
Powering up your IOLAN
Safety warnings for TELCO - NEBS models.
Install Locations for LDC Models
The unit may be installed in one of the following locations.
z Network Telecommunications Facilities. (such as a central office).
z Locations where the NEC (National Electric Company) guidelines apply such as customer
premises, general business offices, residential and retail.
z OSP (Outside Plant) such as outside cabinets and environmental locations.
Wiring up a the Fail-Safe Relay
The LDC series of IOLAN units are also fashioned with a Fail-Safe Relay. The relay is engaged after the unit
is powered up and the software has loaded properly. Should a failure occur, the relay will be disengaged until
the unit returns to a normal state of operation. A failure is defined as a condition which causes the unit to stop
running.
A SPDT set of contacts are provided to the user. These three contact connections are known as "Common",
"Normally Open" and "Normally Closed", and are electrically isolated to the relay. The contacts are rated for
voltages up to 30VDC /AC with a maximum current of 3A.
Note:
The TELCO - NEBS series of IOLAN units do not have a power switch, and an
appropriately rated circuit breaker must be installed externally to the unit. If two power
sources are used, each source must have a circuit breaker. As a safety precaution you
should not rely upon the unit's front panel LEDs as a power indicator.
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