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Installation InstructionsInstallation Instructions,
ROSA Element Management System
Monitoring of the amplifier requires the installation of the transponder type 91051 in
the amplifier. This transponder will communicate back to the headend by means of
the reverse path. The transponder signal is received at the test point at output. Refer
to Fig. 2. The level measured by the transponder will be attenuated by
approximately 33 dB relative to the output signal at output. The transponder
transmitter level is adjusted to the same level as the other reverse signals. The level
from the transponder will be attenuated by approximately 20 dB at the reverse path
since it is inserted with a 20 dB coupler.
With a transponder it is possible to monitor and control different parameters in the
amplifier. As seen in Fig. 2, the built-in reverse path switch can be controlled in
order to locate ingress noise in the reverse path. This can be useful in the search for
errors in larger networks.
Programming of a Compact Transponder type 91051 is done by using the handheld
terminal 91200.
The transponder can be set with:
SMC ID
TX FREQ
RX FREQ
TX LEVEL
BAUD RATE
MODE
Accessories
Test adapter, F type
Fuses
Fuse type
T3.15H250V
T5AH250V
T10AL250V
Notes: All fuses must be replaced by a similar type.
OL-30194-01
Transponder address
Transmit frequency
Receive frequency
Transmit level
Data speed
Transponder mode
A71004
Description
3.15AT, for 230 V AC
5AT, for 24 to 65 V
10 AT, for input/output port
Continued
1 to 65535
5 to 65 MHz
45 to 174 MHz
84 to 110 dBµV
9.6-19.2-38.4 kbps
IEP
11
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