C H A P T E R 3
CONFIGURING NC4000 NODES
This chapter describes how to configure NC4000 nodes to meet specific applications. Depending
on how the nodes were ordered, much of the configuration may already be completed at the
factory. Selected procedures may be performed to reconfigure specific node parameters. The
tasks described in this chapter should be performed (or verified) in a shop/lab environment
before the nodes are installed in the network.
DANGER
Laser Radiation – Use of controls or adjustments, or performance of procedures other
than those specified herein may result in hazardous radiation exposure.
CAUTION
AC voltages in the range of 44 to 95 V AC can be present when power is connected
to the node. Shut down or disconnect external AC power to the node before removing or
replacing the RF amplifier tray in the base housing.
Note
While the NC4000 nodes are ruggedized units designed to operate outdoors in cable
networks, they are not indestructible. Do not drop nodes
―
keep nodes in their shipping boxes
when they are not on the bench. Only qualified technicians should open nodes, remove or
replace components, or make adjustments inside a node. After any bench checks or
adjustments, close the node, being careful not to pinch the cables connecting the lid and
base housings. Repack the node in its shipping box using the original shock absorbing
packing material.
3.1
RF Amplifier Tray Installation
The RF amplifier tray determines the forward and return frequencies of the node, as well as
possible segmentation levels. Verify that you have the appropriate RF amplifier model before
proceeding.
■
Use OA4324HG RF amplifiers in all NC4000 nodes (Table 3.1 lists OA4324HG frequency
splits)
Note
The specific RF amplifier tray (model) constrains the range of forward path receivers
and return path transceivers that can be used with it. When configuring (or reconfiguring)
NC4000 nodes, verify that the receivers and transceivers are compatible with the RF amplifier
tray. In general, forward receiver frequency must be equal to or higher than the RF
amplifier nominal forward frequency, and return transceiver frequency must be equal to or
lower than the RF amplifier nominal return frequency.
Table 3.1 OA4324HG-xx Model Numbers
45/54 subsplit for North American nodes
60/72 subsplit for Japanese nodes
65/85 subsplit for European nodes
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