Teleste AC1500, User Manual, Page: 9 / 16

User manual AC1500
59300547 Rev.001
21.4.2016 9(16)
The return path requires a specific signal level for proper operation. The ideal
level at the amplifier is based on the incoming power and the maximum loss
through which that signal must travel on its way to the amplifier. A typical
individual channel level at the return path input is in range of
• 70…80 dB µ V with 65 MHz US
•
65…70 dB
µ
V with 204 MHz US
Inject a signal of known power into the test signal injection point (Figure 4 pos.
24) and measure the output level at the headend. Once the signal is received at
the headend, it can be measured and the information sent into the forward path
as a narrowband signal. This signal can be detected from the -20 dB test point
(Figure 4 pos. 11). Adjust the gain (Figure 4 pos. 21) and slope (Figure 4 pos.
22) of the amplifier until the target level is produced. Maximum control range for
the return path slope is 15 dB. The upstream level adjustment range is 15 dB.
Options for level and slope control
AC1500 can be equipped with different control modules, offering different level
of automation and remote management.
AC6158 / AC6188 control modules
AC6158 is an ALSC module for automatic gain and slope adjustment. It
measures two user adjustable pilot signals and adjusts the amplifier interstage
gain and slope controls to maintain constant amplifier output level.
AC6188 does not support pilot detection or ALSC, otherwise the two modules
are identical. Thus all references to AC6158 in this manual are valid also for
AC6188 unless otherwise stated.
Both modules support manual gain and slope control and return path ingress
switch control via local UI. They also support Remote Ingress Switching (RIS)
which allows remote ingress switch control via forward path data link using
HDM155 RIS controller module.
AC6952 transponder
AC6952 is an element management transponder with forward and return path
level measurement and ALSC controller unit. AC6952 can be plugged into the
amplifier's transponder slot. Note! AC6952 is applicable with 65 MHz or 85 MHz
upstream signal path.
AC6952 transponder software supports both CATVisor and HMS remote
communication protocols. The communication protocol can be changed via the
user interface.