OL-30194-01
11
Installation InstructionsInstallation Instructions,
Continued
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
Transponder address
1 to 65535
TX FREQ
Transmit frequency
5 to 65 MHz
RX FREQ
Receive frequency
45 to 174 MHz
TX LEVEL
Transmit level
84 to 110 dBµV
BAUD RATE
Data speed
9.6-19.2-38.4 kbps
MODE
Transponder mode
IEP
Accessories
Test adapter, F type
A71004
Fuses
Fuse type
Description
T3.15H250V
3.15AT, for 230 V AC
T5AH250V
5AT, for 24 to 65 V
T10AL250V
10 AT, for input/output port
Notes
: All fuses must be replaced by a similar type.
