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.
FREQ LEVEL CW OPTIONS ENTER
RF SEL
The Conditional Access System
MAJOR ALARM
MINOR ALARM
CW
GQAM Modulator Model D9479-1
Use the following diagrams to assist you with the installation of the GQAM modulator, as well as the location of the connection ports.
D9479-1 120/230 VAC RF GQAM
T11394
120/130V ~ 60/50Hz 1A T4H POWER RF OUT 1 RF OUT 2 RF OUT 3 RF OUT 4
T
-A -V T4H, 250V
D9479-2 48 VDC RF GQAM
GIGABIT
ETHERNET
ASI IN 1 ASI IN 2 ASI IN 3 ASI IN 4
CRAFT
PORT
10/100 BASE-T
LINK ACTIVE GND
-48 VDC
160w
FUSE FUSE
48 VOLTS DC RF OUT 1 RF OUT 2 RF OUT 3 RF OUT 4
+ –
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE
REPLACE ONLY WITH SAME TYPE 6.0 A SLO BLO 250 V FUSE
GIGABIT
ETHERNET
ASI IN 1 ASI IN 2 ASI IN 3 ASI IN 4
CRAFT
PORT
10/100 BASE-T
LINK ACTIVE GND
T11395
Right bracket (PN 734845) and left bracket (PN 734846)
T12803
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Quick Reference Guide
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.
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.
WARNING: Avoid personal injury and product damage!
Do not proceed beyond any icon until you fully understand the indicated conditions.
The following icons alert you to important information about the safe 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.
You may find this icon affixed to this product. This icon indicates a protective earth terminal.
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.
Install GQAM modulators directly above or below each other with 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.
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).
When you are determining heating, ventilation, and air conditioning
(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.
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 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 o F (50 o C) maximum inlet air temperature.
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 o F (50 o C) maximum.
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.
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.

2
This section provides two fully loaded and recommended rack configurations for setting up your GQAM modulator. They include the following configurations:
• Rack with a top-mounted exhaust fan —Includes a 40 rack unit
(RU) configuration with up to 32 GQAM modulators. The remaining 8
RUs are configured with 4 vacant RUs at the top and 4 vacant RUs at the bottom of the rack.
The 4 RU space at the top of the rack is covered with closed panels and uses an exhaust fan (top of rack) to draw the heated air upward and out of the rack. This 4 RU space also allows the ventilation space for the exhaust fan to operate efficiently.
Note : Use an exhaust fan that allows air, at a minimum of 600 cubic feet per minute (cfm), to flow through the rack (2000 cfm is the ideal rate).
The 4 RU space at the bottom of the rack is vented on the front and back of the rack. The vents allow air to freely enter the rack and cool the GQAM modulators.
• Rack with floor plenum forced air cooling —Includes a 40 RU configuration with up to 32 GQAM modulators. The remaining 8 RUs are configured with 4 vacant RUs at the top and 4 vacant RUs at the bottom of the rack.
The lower 4 RU spaces are covered with solid panels and the upper
4 RU spaces are vented along with the entire top of the rack. The floor plenum forced airflow must allow air, at a minimum of 600 cfm, to flow through the rack (2000 cfm is the ideal rate).
Complete steps 1 through 10 to install and connect the GQAM modulator into the rack unit.
Important : Refer to the back page of this quick reference guide to view the front and back panels of GQAM modulator models, as well as the connection ports.
WARNING: To avoid electrical shock, perform only the instructions that are included in steps 1 through 10. Refer all servicing to authorized service personnel.
1
CAUTION: Do not tangle or strain interconnecting cables.
Use caution when installing wiring and racks to avoid obstruction of airflow into the side air vents of the GQAM or out of the vent fans on the side of the GQAM.
Important : You must use the supplied notched rack mounts to provide additional support and to allow correct air circulation through the unit.
Using standard L brackets will restrict airflow and cause the GQAM modulator to overheat.
Complete these steps to install the GQAM modulator into the rack.
a. Unpack and inspect the GQAM modulator.
b. Record the MAC address from the label on the underside of the
GQAM chassis.
c. Install the supplied rack mounts.
Important : The supplied rack mounts (Cisco part numbers 734845 and 734846) must be used. When you use the supplied rack mounts, you can install the GQAM above or below each other in the rack with no space required. d. Place the GQAM modulator in the rack.
e. Insert a mounting screw through each of the four bezel mounting holes on the front panel of the GQAM modulator and then into the rack.
f. Firmly tighten each mounting screw.
2
Follow these steps to connect an earth ground and either a DC or an AC power source to the GQAM modulator.
CAUTION: The 48 VDC GQAM must be connected to an earth ground.
a. Place a ground wire onto the ground lug (labeled GND) on the back of the GQAM modulator.
b. Tighten the ground lug to secure the ground wire.
c. Connect the other end of the ground wire to the rack or to an earth ground.
a. Verify that the DC power source is set to the OFF position.
b. Insert the wires from the DC power source into the terminal block connector.
c. Use a small flat-blade screwdriver to tighten the screws at the top of the terminal block connector to secure the wires.
d. Insert the terminal block connector into the terminal block on the back panel of the 48 VDC GQAM modulator.
e. Keep the DC power source set to the OFF position until you are ready to power on the GQAM modulator.
a. Verify that the power switch on the back of the GQAM modulator is placed in the OFF position.
b. Connect the power cord to the AC power inlet on the back panel of the 120/230 VAC GQAM modulator.
c. Connect the other end of the power cord to an AC electrical outlet.
d. Keep the power source set to the OFF position until you are ready to power on the GQAM modulator.
3
Follow these steps to connect the RF input ports on the rear panel of the
GQAM modulator to the distribution plant (combiner).
a. Locate the 75-ohm coaxial cable attached to the DVB ASI source.
b. Attach the other end of this cable to one of four DVB ASI IN ports on the rear panel of the GQAM modulator.
4
Follow these steps to set up an Ethernet connection and enable the DNCS to perform system management and diagnostics.
a. Connect one end of a screened or shielded CAT-5 cable with an
RJ-45 connector to the rear panel of the GQAM modulator.
b. Connect the other end of this cable to the Ethernet hub.
7
Follow these steps to power on the GQAM modulator.
a. Place the power switch on the GQAM modulator in the ON position.
b. Verify that the GQAM modulator boots.
8
CAUTION: Turning on the GQAM modulator with the default
RF output level may cause RF interference with the services of other units connected to the network. Therefore, set the
RF output level before you connect any RF OUT ports to the network or distribution plant.
Follow these steps to connect the RF out ports on the rear panel of the
GQAM modulator to the distribution plant (combiner).
a. Connect one end of a 75-ohm coaxial cable to each RF OUT port on the GQAM modulator, as needed.
b. Connect the other end of each cable to the distribution plant
(combiner).
5
Follow these steps to connect a data sharing device (for example, the
DNCS or a video-on-demand [VOD] server) to the gigabit ethernet (GbE) port on the GQAM modulator.
a. Insert the gigabit interface converter (GBIC) into the GbE port on the back of the GQAM modulator.
b. Depending on the type of GBIC you are using, connect the data sharing device to the GQAM modulator using one of the following methods:
• Use two single-mode or multimode fiber cables with a type SC connector (one for input and one to output data)
• Use 8-conductor CAT-5 Ethernet 10/100BASE-T wiring with
RJ-45 connectors
Note : The copper GBIC includes a ferrite clamp. Attach this clamp as close as possible to the GBIC end of the Ethernet cable.
9
To verify that you have established the correct RF output for the RF OUT port, follow these steps.
a. Connect an RF OUT port on the GQAM modulator to a spectrum analyzer.
b. Verify the output level for the frequency and the channel using a spectrum analyzer.
c. Repeat steps a and b for the remaining RF OUT port connections.
6
To provision the GQAM modulator as a Digital Broadband Delivery System
(DBDS) element on the Digital Network Control System (DNCS), refer to the Gigabit QAM Modulator Model D9479 Installation and Operation
Guide .
10
After sessions are defined on the DNCS, verify that audio and video are performing properly on a local Digital Home Communications Terminal
(DHCT).
3