Motorola Starline SG 2000 Installation And Operation Manual page 86

Telecommunications optical node
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5 - 2 2
O p e r a t i o n
D S - S G 2 - D R T - 2 X / A D i g i t a l R e t u r n T r a n s m i t t e r
The DS-SG2-DRT-2X/A is an SG2 return transmitter that digitizes two independent analog
5 MHz-42 MHz return-path signals to produce two 1.25 Gbps data streams. These two data streams
are then multiplexed to create a 2.5 Gbps data stream. This data stream is then routed to a digital
laser for transmission to a corresponding digital return receiver.
The transmitter can be configured with a digital laser wavelength that is applicable to the required
link length. An APC system regulates the optical output power from the laser. Two user-accessible
input level-control adjustments enable you to independently adjust the transmitter input levels 2 to
13 dB from an input level of 15 dBmV. All transmitter status-monitor information is available at
the digital return receiver.
To facilitate easy upgrades, the DS-SG2-DRT-2X/A fits the same footprint and has the same set-up
levels as the analog return transmitters.
Figure 5-23 illustrates a block diagram of the DS-SG2-DRT-2X/A:
F i g u r e 5- 23
DS -S G2- DRT -2 X / A
Return
band RF
5-42 MHz
Anti-
aliasing
LPF
CATV
gain block
Return
band RF
5-42 MHz
Anti-
aliasing
LPF
CATV
gain block
Figure 5-24 illustrates the DS-SG2-DRT-2X/A and attached cable:
F i g u r e 5- 24
DS -S G2- DRT -2 X / A
You can gain access to test point A through the transmitter test cable MCX-F (DS-SG2-DRT-TC,
P/N 476803-001).
S G 2 0 0 0 I n s t a l l a t i o n a n d O p e r a t i o n M a n u a l
RF
A/D
XFMR
converter
Transmit
signal
processing
XO
logic
RF
A/D
XFMR
converter
RF
INPUT
B
Test
Test
Point
Point
A
B
Serial bit
stream
@2.5 Gbps
Serializer
XO
SG2000
Digital Transmitter
INPUT
INPUT
STATUS DS-SG2-DRT-2X/A
A
B
1310 DFB
Digital
lightwave to
SG2 output
Optical transmitter module

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