Arris NC4000 - Forward Path RF Switching; Forward Path Segmentation Setup

TM 87-10923 Rev E
Installing NC4000 Nodes 4-13
Table 4.3 Forward Receiver RF Output at the –20 dB Test Point
AR4xxx Output for
RF Amplifier Type
At
54 MHz
At
72 MHz
At
550 MHz
At
870 MHz
At
1002 MHz
One AR4x03G or
AR4x14G receiver
driving an OA4324HG
+10 dBmV
(+30 dBmV)
+10.1 dBmV
(+30.1 dBmV)
+12.6 dBmV
(+32.6 dBmV)
+15 dBmV
(+35 dBmV)
+16 dBmV
(+36 dBmV)
Receiver RF output levels are measured at the –20 dB test point.Levels in parentheses (…) are the true receiver
output levels.
4.7.2 Forward Path RF Switching
If this NC4000 node is configured for redundant forward path RF switching, verify that the
FS4021 or FS4121 switch(s) are installed on the lid motherboard. You can verify FS4x21 threshold
setup by removing the switch(s) and checking the DIP switch setup (per Table 4.4).
Table 4.4 FS4021 Threshold Setup
FS4x21 Threshold
(AR4x03G only)
DIP 1
DIP 2
FS4121 Threshold (AR4x14 &
AR4x24 only)
DIP 1
DIP 2
–2 dBm
Off
Off
–6 dBm
Off
Off
–4 dBm
Off
On
–9 dBm
Off
On
–6 dBm (factory setting)
On
Off
–12 dBm (factory setting)
On
Off
–7 dBm
On
On
–13 dBm
On
On
See 3.4.1 Automatic Forward Path RF Switching on page 3-8 for a detailed discussion of redundant
forward path RF switching.
4.7.3 Forward Path Segmentation Setup
While forward and return paths can be segmented differently, nodes are typically configured
for one forward segment. (One segment is equivalent to no segmentation, meaning that all four
outputs of the RF amplifier carry the same traffic.) Forward segmentation is configured by which
sockets the pads are installed in OA4324HG RF amplifiers (see 4.7.3.1 RF Amplifier OA4324HG Forward
Segmentation).
Note Each port can be configured independently for output levels and slope, as long as:
(1) the level at the highest frequency is equal to or lower than the maximum level available,
and (2) the slope between 51 and 1002 MHz is equal to or higher than 6 dB. This allows for
differentiation between trunk and distribution levels in some HFC architectures.
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