NGP\00329 Rev. C 23-06-2006 Evolution Series - XPAND 17
2.3.5. Alarm and Control Unit
The unit provides interfaces for collection of external alarms or analogue values, and relays for external
alarm and control outputs.
• Eight alarm inputs
• Four relay outputs
• Seven analogue inputs
2.3.6. 64 kb/s Serial Channel Unit
The unit contains four 64kbit/s channel interfaces to be used for user traffic. Two with co-directional
interface, one with contra-directional interface and one V.11 interface (without byte timing).
2.3.7. EOW Unit (Service channel)
The EOW Unit provides a party line service channel for voice communication to other terminals in the
network. It provides the following functions:
• Selective call with two digit telephone number.
• Collective call by pressing *-button.
• Built-in bridge for east/west connections.
• 4-wire analogue interfaces for connection to other service channel equipment.
• One 4-wire Interface with level adjustment
• Two Other Equipment (OE1 and OE2 ) interfaces
• The two OE interfaces can be configured for Daisy-chain operation
• The pinning configuration is adapted to standard Ethernet CAT-5 cable; this enables use of standard
cables.
The IFU can be equipped with two service telephone plug-in units unit. A standard telephone handset
connects to the unit.
2.3.8. Fan Unit
The Fan Unit handles temperature management of the IFU and consists of three fans. An alarm is
generated if one of the fans should fail. The Fan Unit is field replaceable without interrupting the service.
2.3.9. Power Supply Unit
This unit is used if the IFU is not equipped with RIU (Radio Interface Unit) or for duplicated power
supply in a 1+0 configuration.
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