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Page 2 of 10 AMG2784R-DR-CWDMn
Instruction Sheet D15475-
00
Introduction
Unit Functional Schematic
The AMG2784R DR-CWDMn receives a CWDMn
wavelength ‘n’ optical signal from both a primary and
secondary fibre input. (see below for wavelength
options) It drops off up to 8 video signals and a
combined data signal transmitted from AMG2783-n-
DR-CWDMn insert units and transmits out a single
data channel back to the insert units.
In normal operation where connection of both the
previous unit and the subsequent unit are OK, the
video and data signal is taken from the primary input
and the data transmitted out on the primary output. 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 signal
on its secondary output. This signal will be repeated around the ring to get back to this AMG2784R-DR-
CWDMn on the secondary route. As the primary input is not present on this unit, the video and data
signal will now be taken from the secondary optical input. Thus maintaining integrity of the video and 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 return data signal on the secondary optical output. This return data will be transmitted to
the next unit around the ring in the opposite direction on the secondary route.
Optical System Connection
The AMG2784R-DR-CWDMn units are designed to be connected in a ring or point to point system.
In a ring system AMG2783-1-DR-CWDMn, AMG2783-2-DR-CWDMn and AMG2783-4-DR-CWDMn,
single dual and four channel insert units respectively or their rackmount equivalents can be combined to
make up an 8 channel video transmission system as illustrated below. As each unit regenerates the
optical signal, the optical dynamic range between each optically connected node is 22dB.
M
2783-4
4 CHANNEL VIDEO
INSERT
+
BI-DIRECTIONAL
TX O O RX
OPTO SYNC
FRONT PANE L IND ICAT ORS
VIDEO PRESENT
CH1 O O CH2
CH3O O CH4
POWER
O
GND
+12-16 Volts dc
OPTO IN →
VIDEO CH 1
VIDEO CH 2
VIDEO CH 3
VIDEO CH 4
OPTO OUT
GND
OUT-
OUT+
IN-
IN+
DATA
CONNECTIONS
INTERNAL
RS422/485
SWITCHABLE
*
TX O O RX
DATA PRESENT
AM
2783-2
2 CHANNEL VIDEO
INSERT
+
BI-DIRECTIONAL
TX O
RX
OPTO SYNC
FRONT PANEL INDICATORS
VIDEO PRESENT
CH1 O O CH2
CH3 O O CH4
POWER
O
GND
+12-16 Volts dc
OPTO IN →
VIDEO CH 1
VIDEO CH 2
VIDEO CH 3
VIDEO CH 4
OPTO OUT ←
GND
OUT-
OUT+
IN-
IN+
DATA
CONNECTIONS
INTERNAL
RS422/4 85
SWITCHABLE
*
TX O
RX
DATA PRESENT
M
2783-1
1 CHANNEL VIDEO
INSERT
+
BI-DIRECTIONAL
TX O O RX
OPTO SYNC
FRONT PANEL INDICATORS
VIDEO PRESENT
CH1 O O CH2
CH3 O O CH4
POWER
O
GND
+12-16 Volts dc
OPTO IN →
VIDEO CH 1
VIDEO CH 2
VIDEO CH 3
VIDEO CH 4
OPTO OUT
GND
OUT-
OUT+
IN-
IN+
DATA
CONNECTIONS
INTERNAL
RS422/4 85
SWITCHABLE
*
TX O O RX
DATA PRESENT
AM
2783-1
1 CHA NNEL V IDEO
INSERT
+
BI-DIRECTIONAL
TX O O RX
OPTO SYNC
FRONT PANEL INDICATORS
VIDEO PRESENT
CH1 O O CH2
CH3 O O CH4
POWER
O
GND
+12-16 Volts dc
OPTO IN →
VIDEO CH 1
VIDEO CH 2
VIDEO CH 3
VIDEO CH 4
OPTO OUT ←
GND
OUT-
OUT+
IN-
IN+
DATA
CONNECTIONS
INTERNAL
RS422/485
SWITCHABLE
*
TX O O RX
DATA PRESENT
1382
1683
2784R
AMG
------ --- -- --- -- --- - - ---
8 CH VIDEO RX
2 4
7
5
Primary Optical Fibre
Secondary Optical Fibre
Two Optical Fibres
2780R-DR-CWDMn
2700 optics (Primary)
TXRX
2700 optics
(Secondary) RXTX
CWDMn
CWDMn CWDMn
CWDMn
PRIMARY
OPTO IN
Primary Signal Direction
Secondary Signal Direction
SECONDARY
OPTO OUT
PRIMARY
OPTO OUT
SECONDARY
OPTO IN
( to primary input and
secondary output of next
2783-1,2,4-DR,or 2783-DR)
( From primary output and
secondary input of previous
2783-1,2,4-DR,or 2783-DR)
8 Video Outputs 1 Data I/O