Adjustments; Network Setup - Taikan OT-860-1550-xx-SA-x-x User Manual

SECTION FOUR

// ADJUSTMENTS

ADJUSTING THE OMI
Note: The default OMI is set at AGC status.
The Optical modulation intensity (OMI) is set at the optimal level at the time of production. The
"Modulation Depth" indicated on the front panel displays at the NOM position. The NOM position
refers to the Modulation Depth when the full channels are loading, or when the system CNR ≥ 53 dB.
Increasing the OMI value, will result in the following:
> CNR – Increases > CTB & CSO – Decreases
Decreasing the OMI value, will result in the following:
> CNR – Decreases > CTB & CSO – Increases
SETTING AGC STATUS
Please note that the OMI is set at an optimal level and it is recommended that the value not be
adjusted.
ADJUSTING OMI UNDER AGC STATUS
I. Press the arrow button on the front panel until 'OMI Level' displays on the screen.
II. Press the 'Select' button and toggle through the menu using the arrow button to verify the
current OMI status.
If the display shows RF Mode = AGC, then the unit is under AGC status
If the display shows RF Mode = MGC, then the unit is under MGC status
III. To change the status to AGC follow these steps.
Press the 'Select' button to enter the subcategory, to display RF Model=
Press the ▲ Directional Arrow to confi rm RF Mode = AGC. AGC is now complete.
SETTING MGC STATUS
I. Press the arrow button until the display shows the OMI Level Menu
II. Press the 'Select' button to enter the sub menu and toggle through with the arrows until it
plays OMI ADJ= + X
III. Toggle through with the arrow button until you fi nd the appropriate value. The values
are in increments of 0.3 dB.
IV. Press the 'Select' button again to confi rm the OMI value.
ADJUSTING MGC STATUS
I. Press the arrow button until OMI Level appears on the display.
II. Press the "Select' button to enter the sub category and toggle through with the arrow button to
display the RF Mode = AGC
III. Press the arrow button to confi rm , RF Mode= manual
IV. MGC has been successfully set
I. Confi rm that the RF Mode=MGC
II. Gently place a '-' screwdriver into the OMI adjusting hole. Carefully adjust the OMI to the NOM
position. You will know when it is in the NOM position when the two green lamps turn on. At this
point the RF status will turn from red to green.
Taikan // 919 E. 29th St. Lawrence, KS 66046 // tel: 1-800-255-0247
dis-
// fax: 785-841-9512 // email: support@taikan.com // www.taikan.com
SECTION FIVE

// NETWORK SETUP

NETWORK SETUP
Taikan's 1550 Transmitter is designed to be compatible with an EDFA amplifi er. The following factors
should be taken into consideration when doing so:
• Chromatic Dispersion
• SBS
• SPM (Self Phase Modulation)
• Other non linearity effects of fi ber optics
Outlined below are some simple rules for your reference:
CHOOSING THE APPROPRIATE SBS VALUE
To transmit more than 100km, you need to select 13 dBm SBS restrain status. 13dBm restrain
status should be selected because of SPM and optic fi ber chromatic dispersion. Not extending
the bandwidth status when the fi ber length is longer will compromise the transmitters CSO per-
formance. A smaller line bandwidth should be selected for longer distances. The following table
shows the recommended fi ber lengths for each SBS restraint status.
Optical Fiber Length SBS Restrain Condition
< 60 km 13 dBM, 16 dBm, 18dBm
< 70 km 13 dBm, 16dBm
< 120 km 13 dBm
> 120 km 13 dBm (CSO performance may vary)
SBS RESTRAINT VALUES
The table below shows the limit values for the corresponding SBS restraint power.
SBS Restraint Power Optic Fiber Input Power Limit
18 dBm Max 18.4 dBm
16 dBm Max 16.4 dBm
13 dBm Max 13.4 dBm
Please note that if the power is greater than the stipulated limit, it will result in the following:
> Lower frequency band will have 1/f noise
> The CNR will be compromised on lower channels
> HUM is also compromised
ADJUSTING SBS VALUES
The default SBS restraint value is 16.5 dBm. To adjust this value follow these steps:
I. Press the arrow button, and select 'SBS Menu'
II. Press the "Select' button and toggle through the options using the arrow button. Select "SBS=16.5"
III. Press the 'Select' button, to begin selecting the desired "SBS" value
IV. Use the arrow button to select the required SBS critical value
V. Press the 'Select' button again for confi rm
1550nm Transmitter | 13