User Manual

MDR2400 and MDR5800 User Manual

862-01881 Issue 8 Page 11

2 TECHNICAL DESCRIPTION

2.1 System Overview

An MDR digital radio link (DRL) consists of a pair of MDR radio stations.

The MDR radio stations consists of two main parts:

• An Outdoor Unit operating in the 2.4GHz or 5.8 GHz ISM frequency bands. The

Outdoor Unit provides the radio transceiver functionality by accepting radio link

data from the Indoor Unit and converting it to the 2.4GHz or 5.8 GHz ISM

frequency band using spread spectrum modulation. The received signal is de-

spread and transmitted to the Indoor Unit in a digital format.

• An Indoor unit, available with 1, 2 or 4 E1 and 1, 2 or 4 T1 data interfaces (choice

of E1 or T1 is software selectable). The Indoor Unit combines nE1 or nT1 data

with Wayside Service Channel serial data and link IP data to be transmitted

across the radio link. The Indoor Unit also provides power to the Outdoor Unit.

Interconnection between Outdoor Unit and Indoor Unit is achieved using low cost data

and power cables.

2.2 Outdoor Unit

The MDR2400 and MDR5800 Outdoor Units make use of Spread Spectrum

modulation technology for license-free operation in the 2.4GHz and 5.8 GHz ISM

bands.

For MDR operation, the ISM bands are divided into upper and lower frequency sub-

bands. An MDR ‘High Band’ Outdoor Unit transmits in the higher frequency sub-band

and receives in the lower frequency sub-band, while a ‘Low Band’ Outdoor Unit

transmits in the lower sub-band and receives in the higher sub-band. An MDR radio

link will use a ‘Low Band’ Outdoor Unit on one end of the link to communicate with a

‘High Band’ Outdoor Unit on the other end.

The MDR Outdoor Units use a Type-N RF output connector for connection to suitable

2.4GHz and 5.8GHz antennas for applications where long range is required.

The system is available for use in FCC regulated countries.

2.2.1 Frequency plans

User Data

MDR5800 OR MDR2400

MDR IDU

User Data

MDR5800 OR MDR2400

MDR IDU