Nevion 3GHD-EO - Manual (Page 11)

3GHD-EO / 3GHD-EO-2 Rev. E
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3.3 Reclocker mode
The reclocker can be set to re-clock or bypass from DIP#1 and DIP#3 or from GYDA.
When reclocker is set to re-clock mode jitter from the signal is removed. Accepted bitrates is
270, 1483.5, 1485, 2967 and 2970Mbps.
When reclocker is set to bypass, the converter accept all bitrates between 19.4 to 2970Mbps.
Note that in this mode the jitter is not removed and this can cause problems for downstream
equipment.
3.3.1 Transparent
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.
3.4 Automatic change over
Dual electrical converter has an automatic changeover module. 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 turned with DIP#5. From GYDA this function can be turned
on for each converter. Each converter can be configured to what is main and backup input by
DIP#3 and DIP#6 or from GYDA.
3.4.1 Trigger condition
Loss of electrical signal trigs the automatic change over. When the main input loss 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 the alarm is restored.
Note that bit error or loss of lock on reclocker does not trigger the ACO.
3.5 Fibre breakage detection signalling
The module has the possibility for adding a signal to the output at loss of input signal. This
enables receivers to distinguish between a loss of input on transmitter side and a fibre
breakage towards receiver side. From Gyda this new feature can be enabled thru the GPI 1
and GPI 2 function in Multicon Gyda. Setting GPI 1 active enables the fibre breakage
detection signal at loss of input for channel 1. Setting GPI 2 enables it for channel 2.
See application note on Fibre breakage detection signalling for more information.
Note that this feature is only available on modules with hw version 1.1 or higher.
The software auto detects the hardware version and enables the feature
accordingly.