Nevion 3GHD-EO-2-SFP - Manual (Page 9)

3GHD-EO-2-SFP Rev. B
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3.2.1 Cable EQ
Electrical input cable eq. can be turned on and off. If SDI signal is used on the input it is
advised to set the EQ to on. The input will then adjust for the loss of high frequency
component from SDI signal. This will increase the working cable length on the input. If none
SDI signal is used on the input, turning of EQ may help increase the cable length if required.
3.2.2 Re-clocker mode
The re-clocker can be set to re-clock or bypass from DIP#9 and DIP#13 or from GYDA.
When re-clocker is set to re-clock mode jitter from signal is removed. Accepted bitrates is
270, 1483.5, 1485, 2967 and 2970Mbps.
When re-clocker is set to bypass the converter accepts all bitrates between 2 to 2970Mbps.
Note that in this mode the jitter is not removed and this can cause problems for equipment
following the converter.
3.2.2.1 Transparency
This converter only looks at the bitrates and not the content. This means that any signal with
correct bitrates is converted. The product is transparent to data in the ancillary space like
embedded audio.
3.2.3 Automatic change over
This module has the possibility to have an automatic change over on the input. This can be
used in redundancy systems where the user wants automatically switch to a backup port
when the main input loses signal. This function can be selected with DIP#10 and Dip#14.
The main and backup input can be selected with DIP#5 or from GYDA.
3.2.3.1 Trigger condition and latching
Loss of electrical signal on input trigs the automatic change over. When the main input lose
electrical signal the backup input is selected. When the backup input is active an alarm is
displayed in GYDA. When the main input electrical signal is restored the converter switches
immediately back to main input and alarm is restored if latch is set to off. If latch is set to on
the fall back to main input will not happen before the reset is applied to the changeover from
the config pan in Multicon Gyda.
Note that bit error or loss of lock on re-clocker does not trigger the automatic
change over.