User's Manual

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10 Page 32
4.2 Indoor Unit
4.2.1 Introduction
This section describes the recommended installation procedure for the Indoor Unit.
The Indoor Unit is designed for mounting in the DIN 41494 (19") racking standard and
occupies a 1U high slot. Desktop mounting is also possible.
The Indoor Unit’s payload (nT1, nE1 and 10BaseT Ethernet) and Service Channel
(‘Wayside serial’) data interfaces and Element Management interface are located on
the front panel. Input Power, Auxiliary alarm and ‘IU/OU Interconnect’ interfaces are
located on the rear panel for the MDR IU, suitable for rack installations and on the
front panel for the Orion IU, simplifying accessibility.
Refer to paragraph 2.3, page 20 for a view of the IU ports.
The recommended installation procedure for the Indoor Unit is the following:
y. Install the Indoor Unit in the rack.
z. Ground the Indoor Unit. This is required for safety and to minimise radiated
emissions.
aa. Connect the DC power supply. There is no ON/OFF switch on the Orion IU, thus
connecting the DC power supply will start up the radio.
bb. Connect Payload data ports (front panel).
cc. Connect Auxiliary In/Out port (optional).
dd. Connect Service Channel (Wayside) serial port (optional).
ee. Connect the Element Manager port using the supplied cable (front panel).
4.2.2 Installing the Indoor Unit in a Rack
1. Slide the Indoor Unit into the 19" rack and secure to the rack using four (4)
APPROPRIATELY sized bolts for size and rack threads provided. M6 x 18 mm
screws are recommended.
2. Ground the Indoor Unit by connecting the ground cable or strap between the
station ground and the ground terminal on the Indoor Unit rear / front (Orion)
panel.