Headend Installation Instructions

Headend Installation Instructions
North American Cable Equipment Inc.
Headend Setup Instructions
The information contained in this document has been
compiled as a set of guidelines to install a commercial
SMATV headend system that has been pre-assembled
by the lab technicians at North American Cable
Equipment Inc. This document assumes that a proper
sight survey has been conducted and that an acceptable
location has been chosen for the system. The location
should be temperature controlled, clean, dry and dust
free. The location should have sufficient power to
handle the amperage required by the system. This
document also assumes that the required satellite dishes
and or off air antennas have been installed with the
proper number of coaxial lines wired into the headend’s
desired location.
When installing a system in a commercial building,
it is the responsibility of the on-site technician to be
aware of and follow all of the state and local building,
electrical & grounding codes as well as the rules of
The Federal Communications Commission (FCC).
This document has been designed to aid in the installation
of SMATV headend electronics, it does not cover
the distribution of the signal from the headend system
to the viewing locations. Please contact our sales
engineering department at (610) 429-1726 for distribution
design assistance.
Figure 1
Step 1: Unpacking The System
A commercial SMATV system is a delicate yet heavy assembly of precision electronics. North American Cable
Equipment Inc. (NACE) takes great care when packing a system to ensure that it will be delivered free of damage.
Systems are shipped in a wood crate with an endoskeleton that was designed to protect the system. The inside
of the crate has been lined with a foam damper that is required to reject the effects of vibration during the systems
voyage to it’s desired location. The system is also wrapped in bubble wrap and covered with shrink wrap to further
avoid the effects of vibration, static and moisture. It is extremely important for the party taking receipt of the
system to notify the carrier at delivery if there is any damage at all to the outside packaging of the system.
The system should be left by the carrier laying flat on its attached pallet. Remove the screws from the lid of the crate
and remove the lid. Remove the end and or one of the sides of the crate. By removing the foam packing material from
the sides, top and bottom of the system, you will make room to be able to lift the system from the crate. Most systems
will take at least two people to lift from the crate. Lift the system from the crate and set the system upright on its base.
Items that have been ordered for the
Installation but are not attached to the
headend may be in boxes inside the crate.
Do not discard the crate and packing
material until you have looked through the
packing thoroughly to make sure that there
are no products hidden. Pay close attention
for items such as flat non penetrating roof
mounts that could be in the bottom of the
crate under all of the packing materials.
Now that the system is standing upright,
remove the outer shrink wrapping and the
bubble wrapping.
Do not plug anything in at this time!
Figure 2
North American Cable Equipment Inc. (800) 688-9282 Fax: (610) 429-3060
[email protected]
Page 1
North American Cable Equipment Inc.
Headend Setup Instructions
Step 2: Arranging The Racks
In many systems there will be more than one rack of electronics. If this is the case, line the racks in a row with the
lowest channels being on the left when facing the front of the rack. Align the remaining racks with the channels in
ascending order from left to right. This is important since the cables that connect the racks have been cut to length
and will not be the right length if the racks are not in order. All of the connections that will be used to interconnect
the racks are located at the top of the back of the racks on the Rack Interface Plates (RIP). Be sure to leave plenty of
room to walk behind the racks.
Do not plug anything in at this time!
Step 3: Grounding The System
It is the responsibility of the installer to be aware of and to follow all local codes regarding grounding. Systems must
be grounded in accordance with National Electric Code article 250. All racks must be grounded before you begin
working on them. Most importantly, they must be grounded before the coaxial satellite lines are attached and before
the system is plugged into a live AC outlet. In systems with multiple racks 1/2” flat braid ground cable with 1/4-20 bolts
works well as long as it meets all local codes.
Figure 3
Step 4: Interconnecting The Racks
Interconnecting the racks has been made very simple with the inclusion of a Rack Interface Plate (figure 3) located at
the top rear of each rack. The RIP is designed to conveniently locate the satellite and antenna inputs as well as the
RF test outputs. For systems that require more than one rack, the rack interface plate also houses the connections for
the cables that must run between the multiple racks. All inputs/outputs have been placed on these plates and labeled
so you can quickly attach all necessary cables. It is important that the system is not powered up until the
certified working satellite feeds have been connected to the system. Powering the receivers without satellite
input could cause the receiver to begin a boot sequence that will be interrupted. This shouldn’t damage the receiver
but it will take longer to program the receiver once the satellite lines are connected.
Locate your satellite inputs on the RIP. These will be labeled with the type of feed (DTV or DISH)
followed by the voltage (18 or 13). For example, a DTV 18V signal, would be labeled as “DTV
18V INPUT” on the R.I.P. In the event you have multiple lines coming in from multiple satellite
positions, the plate will be marked accordingly. Example 101 13V, 101 18V, 119 13V, 119 18V.
Connect your satellite feed lines into the respective ports at this time. If the system is integrating
an off-air antenna via demodulators and modulators, there will be a port on the plate labeled
“ANT IN” for the antenna input.
Cables cut to custom lengths will be located on one of the racks. Use these cables to connect the
ports on the racks by matching the numbers (1 to 1, 2 to 2, 3 to 3 etc.). This will connect all of your
multiswitches to the correct input signals, combine each racks combiner onto one line and provide
you with two open ports on the top of one of the racks. The first port will be labeled “FINAL OUTPUT”.
This is the output you will use to begin your distribution. The second port will be labeled “TEST TV”.
This port has been attenuated and can be used as a test port to connect a television in the
headend room.
North American Cable Equipment Inc. (800) 688-9282 Fax: (610) 429-3060
[email protected]
Page 2
North American Cable Equipment Inc.
Headend Setup Instructions
Step 4: Interconnecting The Racks (Continued)
With a connector wrench, tighten all connectors to ensure a clean connection. Be very careful not
to torque these connections too hard. Connectors are factory tightened during assembly but they
can vibrate loose in shipping. Push each of the RCA connections in to make sure they did not vibrate
loose during shipping. Make sure that all of the power cords are plugged in.
Find all of the remotes in the room and remove the batteries. The accidental push of a button from
a single remote can change settings on some or all of the receivers in the rack. If you need to
use a remote to program the receivers, select one and make sure that it is used on one isolated
receiver at a time. After the system is installed, hide the remote in one of the rack rails so that it is not
accidentally used. Some installers prefer to cover the remote eye of each receiver with a small
strip of electrical tape .
Before plugging the system in, it is imperative that the outlet, wire and circuit being used have an
amperage rating that is sufficient for the system being plugged in. A standard headend rack with 24
receivers and 24 micro modulators would require a minimum 15 Amp circuit. An EMI, RFI rated
outlet is recommended. For assistance in calculating the required amperage, please contact NACE
before plugging in the system.
Locate the power cord for each rack. This will usually be located at the bottom of the rack on the
back of the rack mounted, surge protected power center. Plug each rack into its designated outlet
being sure not to overload the circuit. Turn on the power centers and your system should come alive.
Figure 4
North American Cable Equipment Inc. (800) 688-9282 Fax: (610) 429-3060
[email protected]
Page 3
North American Cable Equipment Inc.
Headend Setup Instructions
Step 5: Setting Up The Receivers
Since the receivers are not authorized by the satellite signal provider (usually DIRECTV or DISH NETWORK) at the
time of assembly, they will not be tuned to the desired program. Each of the receivers will be labeled on the front
with the output channel number of the modulator it is wired to at the very least. If programming information is
supplied to NACE at the time of assembly, this information may be on the label as well. Consult your programming
contract to determine what programming will be on each receiver.
Step 6: Balancing The Output
Do not adjust any of the tuning screws on the modulators or amplifiers if you do not have a signal level or
spectrum analyzer connected to the system.
RF Output:
Each system is balanced according to the customer’s requirements. If no requirements are issued
at the time of assembly, the system will be balanced with a flat 45 dBmV RF output.
Aural Carriers: Aural carriers are normally set at least 16 dB below the video carriers.
Volume levels are set to an even level during assembly using a constant input. When the receivers
are authorized and providing individual programming to each of the modulators the volume may
need to be adjusted to compensate for differences in the input to each modulator.
Video levels are balanced during assembly to provide a balanced brightness and contrast using a
constant, fixed input. This level may need to be adjusted slightly when individual programming is
supplied to the modulator by its satellite receiver.
Figure 5
Adjusts Volume
Adjusts Brightness
Of Video
Adjusts RF
Output Level (dBmV)
Adjusts Audio To
Video Output Ratio
Congratulations, your system should now be ready to connect to your distribution system.
North American Cable Equipment Inc. (800) 688-9282 Fax: (610) 429-3060
[email protected]
Page 4
North American Cable Equipment Inc.
Headend Setup Instructions
Most of the troubles that arise during the setup of a pre-built headend system can be solved by simply
Isolating the problem.
Trouble With Groups Of Channels:
If you are missing a selected group of channels, find out what each of these channels have in common.
Are all of the channels on one rack?
If Yes, does the rack have sufficient AC power?
Are all of the receivers connected to the same multiswitch?
If Yes, using a satellite meter confirm that the inputs to the multiswitch have adequate
signal level.
If the proper signal level is at the input to the switch, confirm that the switch has the proper
output voltages (13V/18V). Doing this will confirm that the switch is receiving power from the
power supply. If there is no LNB power out of the switch, swap the switches power supply
with a known working unit to see if this solves the problem.
Are all of the channels from a specific satellite position?
Confirm that the incoming lines from the satellite dish contain signal from the desired satellite
position. If you do not have a meter that verifies the incoming satellite position, hook a
satellite receiver directly to each of the incoming satellite lines.
Are all of the channels from one polarity of a single satellite position?
Follow the steps above to determine if the problem lies in the LNB, incoming satellite lines,
satellite splitters, satellite power supply or individual multi-switch input ports.
Are all of the channels on a single combiner?
If Yes, check the connections to ensure that the output cable from the combiner is connected
to the output of the combiner and the combining network (usually a splitter/combiner) used
to combine multiple combiners together before going into the system amplifier.
Are the modulators plugged into the same power supply?
If Yes, swap the power supply in question with a known working unit and see if this fixes
the problem.
North American Cable Equipment Inc. (800) 688-9282 Fax: (610) 429-3060
[email protected]
Page 5
North American Cable Equipment Inc.
Headend Setup Instructions
Trouble With An Individual Channel:
If you are having trouble with a single channel’s audio, video or audio and video the problem can
usually be isolated to either the receiver or the modulator.
Receiver Isolation Test:
If you have no audio or video on channel 9, plug the audio (red) and video (yellow) lines from the input
of the channel 9 modulator into the channel 10 (known working) modulator. If you now get no picture
on channel 10 you are likely to have either have a bad receiver or bad cables. If you have determined
that the receiver is not working properly, skip to the receiver troubleshooting section below.
Modulator Isolation Test:
If this does not fix the problem, try connecting the audio and video input lines from the channel 10
(known working) modulator into the channel 9 modulator. If you get no picture on channel 9, the
modulator is likely to be the problem. If you have determined that the modulator is not working
properly, contact our lab for further troubleshooting options at (610) 429-1726.
In From Multiswitch
Gray RG-6
Figure 6 Receiver Connections
Video Out To Modulator
Yellow RG-59,
RCA Connector
Audio Out To Modulator
Red RG-59,
RCA Connector
Video In From Receiver
Yellow RG-59,
F Connector
Figure 7 Modulator Connections
Audio In From Receiver
Red RG-59,
RCA Connector
RF Out To Combiner
Green RG-59,
F Connector
Receiver Troubleshooting:
If you are having a problem with particular channel and you have isolated the problem to the satellite receiver, see
the following two pages for detailed receiver troubleshooting.
To download current receiver software on a DIRECTV D11 receiver, follow the steps below.
To verify the current software version:
As of 6/29/06, the current software version is 0X1005.
Follow these steps to force a receiver to update software.
1. Reset the receiver.
2. While it is re-booting, press 02468 on the remote.
3. The on-screen display will confirm a download in progress.
North American Cable Equipment Inc. (800) 688-9282 Fax: (610) 429-3060
[email protected]
Page 6
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF