Introduction
Unit Functional Schematic
The
AMG3788BERN-DR
receives optical signals from
both a primary and secondary
optical channel. The primary and
secondary channels operate at
the same wavelength (1310nm)
and are transmitted on separate
optical fibres.
The
AMG3788BERN-DR
drops
off up to 8 video signals and up
to 9 data / audio and Ethernet
signals transmitted from the
AMG3717BE-DR
insert units. It
also transmits the data and
Ethernet signals back to the
insert units.
As each unit regenerates the optical signal, the optical dynamic range between each optically
connected node is 17dB.
Video Input Channel Configuration
At the
AMG3717BE-DR
or rackmount
AMG3717BER-DR
insert unit, video signals present at the BNC
inputs can be inserted on one to eight video channels transmitted on the optical fibre. The first video
channel number of each insert unit is set by the rotary switch on the front panel of the unit.
It is normal to set each insert unit to a different channel number. If the same number is used twice, an
insert unit connected 'down stream' on the primary optical route will 'over-write' any coincident video
channels coming from the previous insert unit and those video signals will be lost.
The switch channel numbers 1 to 8, correspond to video channels 1-8. Unused switch channel
numbers 0 & 9 duplicate video channel selections 1 & 8 respectively. i.e. setting switch to position 0 or
1 selects video channel 1 and setting switch to position 8 or 9 selects channel 8.
Dual Redundant Operation
In normal operation where connection of both the previous unit and the subsequent unit are OK, the
video and data signals are transmitted on the primary output and the data received from the primary
input. The secondary optical input is independent and is regenerated on the secondary output.
If the primary input signal is not present, the unit will shut down the secondary output to inform the
previous unit that the signal route is not OK. The previous unit will then send out the video and data
signals on its secondary output in the opposite direction. This signal will be repeated around the ring to
get back to this
AMG3788BERN-DR
on the secondary route. As the primary input is not present on
this unit, the data signal will now be taken from the secondary optical input. Thus maintaining integrity
of the data transmission.
If the secondary input signal is not present, the unit will assume that the route to the next unit is not OK
and send out the video and data signal on the secondary optical output. This video and data will be
transmitted to the next unit around the ring in the opposite direction on the secondary route.
Optical Connection
AMG Systems Ltd. reserves the right to make changes to this
document without notice. The information herein is believed to
be accurate. No responsibility is assumed by AMG for its use.
Page 4 of 18
AMG3788BERN-DR Instruction Sheet
D16870.doc
issue 01
