Plessey MDR2400-SR, User Manual, Page: 20 / 131

MDR2400-SR, MDR5800-SR and Orion 5825-SR
Issue 10
Page 20
2.3 Indoor Unit
The Indoor Unit is designed for mounting in a 19” rack, occupying a 1U slot. It can
also be used as a table-top system.
The Indoor Unit accepts n x T1/nE1 user payload channels and combines it with
Wayside Service Serial Data and IP data to be transmitted across the radio link.
The Indoor Unit is fitted with a DC power supply.
There are three types of Indoor Units:
An MDR 120 Ohm (scalable up to 4 T1/E1),
an MDR 75 / 120 Ohm (scalable up to 4 T1/E1),
and an Orion 25 Indoor Unit (scalable up to 8 T1/E1).
A firmware variant exists that determines whether the Outdoor Unit used with the MDR
Indoor Unit is an MDR2400 or an MDR5800. The Indoor Unit hardware is
independent of the type of Outdoor Unit i.e. whether it is an MDR2400 or MDR5800.
The Orion 25 Indoor Unit is used with the Orion 5850 Outdoor Unit, but can also
support the MDR2400 and MDR5800 OUs if the appropriate firmware version is
loaded on the Indoor Unit.
MDR MTE INDOOR UNIT V2, 120 OHM 651-03810-02.1, front panel
MDR MTE 75/120 OHM INDOOR UNIT 651-04008-02, front panel
MDR MTE 120 OHM and 75/120 OHM INDOOR UNIT, rear panel
Orion 25 INDOOR UNIT
651-04189-01 (front panel – no rear panel connectors)
1 Payload
T1/E1
1 Payload
T1/E1
2 IU Status
LEDs
2 IU Status
LEDs
2 IU Status
LEDs
3 Reset
button
3 Reset
button
3 Reset
button
9 OU
DC Out
9 OU DC
Out
4
4
4
5
5
5
6 10BaseT
RJ45 Socket
6 10BaseT
RJ45 Socket
6 10BaseT
RJ45 Socket
7
7
8 IU/OU
Data RJ45
8 IU/OU
Data RJ45
10 Auxiliary IO
10 Auxiliary IO
11 IU
DC In
11 IU DC In
12
Fuse
12
Fuse
13 ON/OFF
Switch
14 Ground
Terminal
14 Ground
Terminal
1 Payload
T1/E1