Cisco Model D9479 Gigabit QAM Modulator Technical References
Gigabit QAM Modulator
Rack Installation
Rack Installation
Introduction
This rack installation quick reference is intended for individuals who are
responsible for installing the gigabit quadrature amplitude modulation
(GQAM) modulator into a rack system.
responsible for installing the gigabit quadrature amplitude modulation
(GQAM) modulator into a rack system.
For detailed descriptions of the installation process and safety information
for the GQAM modulator, refer to the Gigabit QAM Modulator Model
D9479 Installation and Operation Guide, part number 745431.
for the GQAM modulator, refer to the Gigabit QAM Modulator Model
D9479 Installation and Operation Guide, part number 745431.
Warning and Caution Icons
WARNING: Avoid personal injury and product damage!
Do not proceed beyond any icon until you fully understand the
indicated conditions.
indicated conditions.
The following icons alert you to important information about the safe
operation of this product.
operation of this product.
You will find this icon in this quick reference. This icon indicates
important operating or maintenance instructions.
You may find this icon affixed to this product and in this quick
reference to alert you of electrical safety hazards. This icon
indicates a live terminal; the arrowhead points to the terminal
device.
indicates a live terminal; the arrowhead points to the terminal
device.
You may find this icon affixed to this product. This icon indicates
a protective earth terminal.
Stacking Guidelines
Important: In order for the fans to operate correctly, you must install
each GQAM modulator using the rack mount brackets included with
the unit. These brackets contain notched cutout sections to allow for
clearance so that air can enter and exit the unit without restriction.
each GQAM modulator using the rack mount brackets included with
the unit. These brackets contain notched cutout sections to allow for
clearance so that air can enter and exit the unit without restriction.
Install GQAM modulators directly above or below each other with
no requirements for vented spacers when you use the rack mounts
provided.
no requirements for vented spacers when you use the rack mounts
provided.
To view the proper orientation of the rack mount brackets, go to the back
page of this document.
page of this document.
Controlling GQAM Modulator Operating
Temperature
Temperature
CAUTION: Cisco headend equipment is designed to operate
in a maximum 122°F (50°C) environment. Specifically, this means
that the air temperature at the air inlet of any GQAM modulator
must never exceed 122°F (50°C).
that the air temperature at the air inlet of any GQAM modulator
must never exceed 122°F (50°C).
When you are determining heating, ventilation, and air conditioning
(HVAC) calculations, each GQAM modulator draws 151 W of input power
(515 BTU/hr).
(HVAC) calculations, each GQAM modulator draws 151 W of input power
(515 BTU/hr).
Example: A full rack system (32 GQAM modulators) totals 4832 W (16,480
BTU/hr) of input power.
BTU/hr) of input power.
Using Side-by-Side Equipment Racks
Side-by-side equipment racks often do not include an internal wall
between them. Therefore, take extreme caution if you are installing GQAM
modulators in these types of rack systems. Because there is an 18
between them. Therefore, take extreme caution if you are installing GQAM
modulators in these types of rack systems. Because there is an 18
o
F
(10
o
C) rise from the inlet air temperature to the exhaust air temperature
on a GQAM modulator, a cumulative effect on the temperature may result
from one rack to an adjacent rack. Remember, you cannot exceed the
122
from one rack to an adjacent rack. Remember, you cannot exceed the
122
o
F (50
o
C) maximum inlet air temperature.
Using an Equipment Rack Adjacent to a Wall
Make sure you have sufficient exhaust on one side of each GQAM
modulator if it is installed in a rack adjacent to a wall. If there is not sufficient
airflow through the rack, the heated exhaust air may recirculate to the input
side of the GQAM modulator and produce inlet air temperatures above
the 122
modulator if it is installed in a rack adjacent to a wall. If there is not sufficient
airflow through the rack, the heated exhaust air may recirculate to the input
side of the GQAM modulator and produce inlet air temperatures above
the 122
o
F (50
o
C) maximum.
Measuring the Inlet Air Temperature
If you are concerned about the inlet air temperature at the air inlet of any
GQAM modulator, you can measure the inlet air temperature in the rack.
When measuring the temperature, ensure that all cabling is complete and
that all adjacent GQAM modulators are installed and running.
GQAM modulator, you can measure the inlet air temperature in the rack.
When measuring the temperature, ensure that all cabling is complete and
that all adjacent GQAM modulators are installed and running.
Important: Opening the door on the back panel of the rack can have
an adverse effect on the managed airflow. If access to the door is not
controlled, measure the inlet air temperature with the back panel door
open because this typically redirects the airflow in an adverse manner.
an adverse effect on the managed airflow. If access to the door is not
controlled, measure the inlet air temperature with the back panel door
open because this typically redirects the airflow in an adverse manner.
GQAM Modulator Front Panel
Use the following diagram to assist you with the installation of the GQAM modulator.
Note: The front panel is identical for both GQAM modulator models.
GQAM Modulator Back Panels
Use the following diagrams to assist you with the installation of the GQAM modulator, as well as the location of the connection ports.
MAJOR ALARM
MINOR ALARM
CW
GQAM Modulator Model D9479-1
CW
RF SEL
OPTIONS ENTER
FREQ
LEVEL
The Conditional Access System
T11394
T11395
D9479-1 120/230 VAC RF GQAM
D9479-2 48 VDC RF GQAM
120/130V ~ 60/50Hz 1A T4H POWER RF OUT 1
RF OUT 2
RF OUT 3
RF OUT 4
ASI IN 1
ASI IN 2
ASI IN 3
ASI IN 4
DATA 1
CRAFT
PORT
GND
10/100 BASE-T
LINK ACTIVE
GIGABIT
ETHERNET
LINK
ACTIVE
DATA 2
DATA 3
DATA 4
T4H, 250V
T
-A
-V
RF OUT 1
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE
REPLACE ONLY WITH SAME TYPE 6.0 A SLO BLO 250 V FUSE
REPLACE ONLY WITH SAME TYPE 6.0 A SLO BLO 250 V FUSE
RF OUT 2
RF OUT 3
RF OUT 4
ASI IN 1
ASI IN 2
ASI IN 3
ASI IN 4
GIGABIT
ETHERNET
LINK
DA
T
A
1
ACTIVE
CRAFT
PORT
GND
10/100 BASE-T
LINK ACTIVE
DA
T
A
2
DA
T
A
3
DA
T
A
4
-48 VDC
160w
FUSE
FUSE
48 VOLTS DC
–
+
T12803
Rack Mount Brackets
Right bracket (PN 734845) and left bracket (PN 734846)
Quick Reference Guide
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Part Number 749232 Rev C