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Page 3 of 8
AMG3741E-DR-SF Instruction Sheet
D16956-03.doc
Introduction
Unit Functional Schematic
The
AMG3741E-DR-SF
transmits
and receives the optical signals
from both a primary and secondary
optical channel.
These optical channels are
transmitted on the same optical
fibre in opposite directions,
operating at different wavelengths.
The primary channel operates on
1550nm and the secondary
channel on 1310nm.
The
AMG3741E-DR-SF
receives and drops off Ethernet signals transmitted from an
AMG3782ERN-
DR-SF
receiver, it then inserts video and Ethernet signals onto the outgoing optical signal.
As each unit regenerates the optical signal, the optical dynamic range between each optically
connected node is 17dB.
Video Input Channel Configuration
At the
AMG3741E-DR-SF
or rackmount
AMG3741ER-DR-SF
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 optical connection to both the previous unit and subsequent insert units is
OK, video and data signals are transmitted on the primary output and data is 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, a 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 unit 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, an insert 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.
