Chapter 2 Installation
Inserting the Modules
© 2011 Harmonic Inc.
22
bNSG 9000 & NSG 9000-3G, Rev D
2.2.5.3
Ground
Every rack must be properly earthed, connected to the ground bus of the plant.
Each NSG9000 device in the rack must also be connected to the main Earth line of the
rack, using a 14 AWG copper wire. See
3.7.1 Grounding the Mounted Devices
on
page 31.
2.2.6
Facility Cooling Requirements
Each fully-loaded NSG 9000 device generates heat of 510 Watts (in case of AC power
supply). This translates into 1,734 BTU/hour.
Considering 15% general leakage of a typical air conditioning system and 25% latent heat,
the required cooling capacity of the facility's air conditioning system is:
Per a single NSG 9000 unit - 2,490 BTU/hour
Per a rack of ten NSG 9000 units - 24,925 BTU/hour
NOTE:
It is assumed that the head-end air conditioning system is designed to circulate the air in a
manner that ensures the same ambient temperature for all the NSG 9000 devices in a rack.
Ambient temperature for a continuously operating device should be 25c
°.
NSG 9000 can
continuously operate in ambient temperature of up to 50c
°.
However, continuous operation in
a high ambient temperature shortens the device lifetime.
2.2.7
Required Tools for Installation
Four screws to secure the unit to the rack
A screwdriver for fastening the screws
Supporting rails provided by Harmonic in a separate kit
(P/N RM-4-30).
To install the NSG 9000 platform in a rack:
NOTE:
It is recommended to install the NSG 9000 platform before mounting any cards or modules.
1.
Install the rack-mounting rails before mounting the device on the rack.
2.
Place the 2-RU chassis on the rack and slide it along the supporting rails.
3.
Push the device back until the rack-mount holes in the front of the device line up with the
rack posts.
4.
Insert four screws through the mount holes in the front of the device to go through the
corresponding holes on the rack posts.
5.
Tighten the screws with a screwdriver.
2.3 Inserting
the
Modules
The NSG 9000 platform is shipped without any modules inserted. Prior to inserting the
Processing module or QAM-RF modules, read the following guidelines for handling the
modules.
Warning:
Electrostatic Discharge (ESD) may damage the platform components. Take
precautions to eliminate ESD from your body and clothes before handling the platform or
module by using a wrist band and a rubber mat and read the following section.
To prevent damage caused by ESD, it is recommended to follow these instructions:
