Aviat Networks CTR 8540, Hardware Installation

Page: 8 / 20

CTR 8540 GETTING STARTED: INSTALLATION
Function/Requirement Priority Details
Restricted access
The CTR and its associated dc power supply must be installed in a
restricted access area such as a secure equipment room, closet, or
cabinet.
Required Rack Space
CTR requires 44.5 mm (1RU) of vertical rack space and 300 mm rack
depth (CTR chassis depth is 240 mm).
Ventilation
CTR requires unobstructed air passage to each side for ventilation
purposes. There must be a minimum of 50 mm (2”) of side spacing
to any rack panels, cable bundles or similar. No space above or below
is required for ventilation purposes.
Maximum Ambient
Temperature
CTR is specified for a maximum ambient temperature (Tmra) of
+55° Celsius (131° Fahrenheit). This ambient applies to the
immediate operating environment of the CTR, which if installed in a
rack cabinet , is the ambient applying to its location within the
cabinet.
Physical stability
Ensure that adding a CTR to a rack does not adversely impact the
physical stability of the rack.
Power Supply -48 Vdc
The CTR and optional PWR modules have the +ve pin on their dc
power supply connector connected to the chassis.
It must be used with a -48 Vdc power supply which has a +ve
ground; the power supply ground conductor is the +ve supply to the
CTR.
The power supply must have an accessible power disconnect device
(main switch).
Power 24 Vdc An external 24 Vdc to -48 Vdc converter is required at sites using 24
Vdc powering.
D.C. Supply Ground Con-
nection CTR equipment has a connection between the earthed conductor of
the d.c. supply circuit and its earthing conductor.
CTR equipment must be connected directly to the d.c. supply system
grounding electrode conductor or to a bonding jumper from a
grounding terminal bar or bus to which the d.c. supply system
grounding electrode is connected.
Switching or disconnecting devices must not be in the grounded
circuit conductor between the d.c. source and the point of
connection of the grounding electrode conductor.
o
The CTR chassis must be grounded to the station or master
ground, which must be the same ground as used for the dc
power supply system.
o
Normally this is achieved by grounding the CTR to the ground
bar in its equipment rack or frame. This bar is most often
located to one side of the rack or at rack top or bottom. In turn,
the ground bar is grounded to the station ground.
Equipment Location
CTR must be located in the same immediate area (such as, adjacent
cabinets) as any other equipment that has a connection between the
grounded conductor of the same d.c. supply circuit and the
grounding conductor, and also the point of grounding of the d.c.
system. The d.c. system shall not be grounded elsewhere.
Location of D.C. Power Sup-
ply The d.c. supply source for CTR equipment must be located within the
same premises as the CTR equipment.
4 AVIAT NETWORKS