User Manual

MDR2400/5800-SR, Orion2410/5810-SRi and Orion 5825-SR
862-01881 Issue 12c Page 19
NOTE A special version of the MDR Digital Indoor Unit exists that allows the user to
select AMI or B8ZS line encoding on a per-trib basis for T1 connectivity. These Digital
Indoor Units are marked as Version 2.1AT and are identified by an “Individual Line
Code” label between the ON/OFF switch and the ground terminal on the rear panel of
the DIU.
Line codes can be selected on a per-trib basis using the Orion NMS software
application. In the Payload Configuration window:
1. Set the Digital Indoor Unit Payload interface to T1 mode and Apply.
2. Refresh the information displayed in the window.
3. Select the desired Line Code next to each trib and Apply.
Hardware modified to implement this feature can ONLY work with special DIU
firmware – contact the distributor for details.
2.3.2 1+1 Redundancy Protected Payload System
The MDR and Orion radios can be used in a 1+1 redundant mode system to protect
the tributary payload data carried over a radio link. This system detects the quality of
the link over which it is receiving data and allows switching between two parallel radio
links to protect the user data against link failures.
Please refer to Appendix I, or the Protection Kit user manual, doc. no. 862-02236 for
detail on the functioning of this system.
2.3.3 Digital Indoor Unit Status LEDs
The Digital Indoor Unit LED functionality is described as follows:
SYSTEM
Green OK, Orange (RFU/DIU Comms Error), Red (RFU/DIU Comms Down)
PAYLOAD
Green OK, Orange (AIS Detected), Red (LOS Detected)
RF LINK
Green OK, Orange (FEC Correcting Errors), Red (FEC unable to correct errors)
In ALL cases flashing red and orange LEDs imply historic alarm conditions (The alarm
can be cleared using the front panel button ‘position 1’ : see next section).
Flashing LED’s and yellow indicators (Orion NMS) may also be cleared by clicking on
the “Clear Alarms” button in the Orion NMS Main Radio Window.
2.3.4 Reset / Configuration Button
The functionality of the Reset Button is described below. These functions are used to
set up the radio. A paper clip or similar “probe” can be used to push the “reset /
configuration button”. The count value / LED count at which the button is released, will
be the "new" configuration / state of the DIU.