User Manual

MDR2400/5800-SR, Orion2410/5810-SRi and Orion 5825-SR
862-01881 Issue 12c Page 31
Please refer to paragraphs 4.3.1 and 8.5.10 for details on the RF and data cables,
which are also customer furnished equipment.
4.2 Digital Indoor Unit
4.2.1 Introduction
This section describes the recommended installation procedure for the Digital Indoor
Unit. The Digital 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 Digital 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 ‘DIU/RFU Interconnect’
interfaces are located on the rear panel for the MDR DIU, suitable for rack installations
and on the front panel for the Orion DIU, simplifying accessibility.
The recommended installation procedure for the Digital Indoor Unit is the following:
1. Install the Digital Indoor Unit in the rack.
2. Ground the Digital Indoor Unit. This is required for safety and to minimise radiated
emissions.
3. Connect the DC power supply. There is no ON/OFF switch on the Orion DIU, thus
connecting the DC power supply will start up the radio.
4. Connect Payload data ports (front panel).
5. Connect Auxiliary In/Out port (optional).
6. Connect Service Channel (Wayside) serial port (optional).
7. Connect the Element Manager port using the supplied cable (front panel).
4.2.2 Installing the Digital Indoor Unit in a Rack
1. Slide the Digital 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 Digital Indoor Unit by connecting the ground cable or strap between
the station ground and the ground terminal on the Digital Indoor Unit rear / front
(Orion) panel.