User Manual

Table Of Contents
Document name:
OMU Commands and Attributes 1.0.0 v1.0
Version:
1.0
7 OPTO INTERFACE CONFIGURATIONS
This section describes attributes used to read out and configure settings related to the
FiberOptic modules and corresponding pilot tone functionality.
7.1 OLA – Optical Loss Adjustment
This attribute is used to read and adjust link between master and optical slave unit.
7.1.1 Usage
Attribute type: Read and Action
This attribute is used to perform an automatic adjustment of the fiber optic link to
compensate for losses, and to read status of last performed adjustment.
Adjustments are made to get a well balanced and optimized system, maintaining desired
gain over the entire link from input of Optical Master Unit to output of repeater. When
performing the adjustment from slave to master, a pilot tone with a well defined level is
sent form the slave to the master. To start the measurements, the master must first enable
pilot tone signal in the slave (Fiber Optic Slave in repeater), after which pilot tone
adjustments can be performed.
Once routine is finished, Pilot Tone in slave is disabled again
Format on ACT:
ACT OLA <Rack>:<Slot> [-v] [-l]
performs automatic adjustment of the opto link from the repeater to the optical master
unit in rack <Rack> and <Slot>.
If supplying parameter -v (as verbose) progress information is printed out on the screen
as the adjustments proceed.
If supplying parameter -l (as local) enabling / disabling pilot tone on remote node is
disabled.
Example:
ACT OLA 1:3
performs an optical link adjustment of link from repeater to opto module in rack one, slot
3.
Reading OLA replies with status of last performed adjustments.
Format on GET:
GET OLA <Rack>:<Slot>
reads last fiber optic adjustment for link from slave repeater to opto module in rack
<Rack>, slot <Slot>.
Reply:
<Status> <Start Time> <Stop Time> <Initial Attenuation> <Resulting
Attenuation> <Resulting Pilot Tone Level> <Number of Iterations> <Result
String>
where
<Status> is status of last measurement, 0 means adjustments were successfully
completed, 1 means adjustments failed.
<Start Time> is on the format HHMMSS DDMMYY, where HHMMSS is the time with
24 hours notation, and DDMMYY is the date for when last measurement started.
<Stop Time> is on the format HHMMSS DDMMYY, where HHMMSS is the time with
24 hours notation, and DDMMYY is the date for when last measurement finished.
<Initial Attenuation> is the attenuation set before starting the adjustment routine.
<Resulting Attenuation> is the attenuation that was set when routine was completed.
<Resulting Pilot Tone Level> indicates the received pilot tone level in dBm * 10 when
adjustment was completed (for optimal performance, pilot tone should be adjusted to
-32.0 dBm).
<NumberOfIterations> indicates number of iterations (Set Attenuation- Read Pilot Tone
21(45)