Cable Television System and CATV Architecture

Flashcards covering the key concepts and definitions from the lecture notes on Cable Television Systems and CATV Architecture.

What is the purpose of the Electronics Code on Cable TV System?

To provide the necessary specifications, installation guidelines, procedures, and measurements to assure the delivery of quality television signal and reliability of cable TV facility and protect other communication utilities from interference.

What does the Electronics Code on Cable TV System cover?

The code covers the specifications for the system, its installation, cabling, operating parameters of the TV system (analog and digital), cable internet specifications, grounding, cable specifications, and testing procedures. The code does not cover the brand or model of equipment to be used.

What permits and inspection certificates are needed for cable installation?

An Electronics Permit is needed before work is started. The applicant shall obtain an Electronics Permit for commercial buildings from the Office of the Local Building Official which needs the service of a Professional Electronics Engineer (RA 9292) before starting the cable installation.

What are the requirements for an Electronics Permit?

Applicant, PECE who signed and sealed electronic plans and specifications, PECE and/or ECE who is in charge of cable installation and electronic works, Building/lot owner, Building official

What information should be included in the contents of the plan?

Location and site plans, Legends and symbols, General notes and specifications, Floor plan of headend facility, Cable TV distribution lay-out, One line diagram of head-end system, One Line diagram of Distribution system, Standard title block

What is the scope of a service entrance facility?

Service entrance facility (aerial or underground installations with conduits, pull boxes and cabinets) starts from the outside plant to main service box of the building. It applies to all multi-dwelling units (MDU) that require structured cabling within the building.

What is the minimum vertical clearance for roads, streets, alleys, non-residential driveways, and parking lots?

5.5 meters (18 feet)

What is the minimum vertical clearance for residential driveways?

4.7 meters (15.5 feet)

What is the minimum vertical clearance for sidewalks and other pedestrian traffic areas?

3.5 meters (11.5 feet)

What is the minimum vertical clearance for railroad tracks?

7.3 meters (24 feet)

What is the minimum vertical clearance over roofs not accessible to pedestrians?

1 meter (3 feet)

What is the minimum vertical clearance over balconies and roofs accessible to pedestrians?

3.2 meters (10.5 feet)

What is the minimum horizontal clearance to walls, projections, windows, balconies and areas accessible to pedestrians?

1.4 meters (4.5 feet)

What is the minimum horizontal and vertical clearances for signs, chimneys, billboards, radio and television antennas, and other installations not classified as building or bridges?

1 meter (3 feet)

How deep should conduits installed underground be buried?

Shall be buried at least 600 mm below the ground.

What type of cable could service entrance cables be?

Coaxial cable or fiber optic cable

What coaxial cable size is needed from the outside plant to the service entrance box of the building?

A minimum of 0.500 coaxial cable, solid Al, 75 ohms shall be laid out from the outside plant to the service entrance box of the building.

What are the inside dimensions of a Service Entrance Cabinet?

915 mm (H) x 610mm (W) x 305 mm (D), AWG #16

What is the scope of backbone cabling system?

Backbone cabling system provides interconnection between entrance facilities, headend equipment room and horizontal distribution system within the building.

Backbone cabling can be referred to as what?

Vertical cabling

What cables are recognized for Backbone Distribution System within a building?

500 Coaxial Cable, Fiber Optic Cable (Single-mode), Fiber Optic Cable (Multimode 50/125 or 62.5/125 μm), Category-6 Copper Cable (UTP, SCTP)

What is the conduit size and type for Provider to Service Entrance Pull Box?

2 x 100 mm, PVC or IMC

What is the conduit size and type for Service Entrance Pull Box to Main Pull Box and Riser (Vertical-Backbone)?

2 x 50 mm, PVC or IMC

What is the conduit size and type for Feeder (Horizontal-Backbone)?

1 x 50 mm, PVC or IMC

What is the minimum height, width, depth, and gauge of a Pedestal Box?

915mm x 610mm x 305mm, #16

What is the minimum height, width, depth, and gauge of a Main Pull Box?

1220mm x 915mm x 305mm, #16

What is the minimum height, width, depth, and gauge of a Distribution Pull Box?

813mm x 508mm x 305mm, #18

What is the minimum height, width, depth, and gauge of a Splice Pull Box?

610mm x 407mm x 305mm, #18

What cables are recognized for horizontal distribution?

RG-6 coaxial cable (single-shield, 90% braid, 75 ohms), Single-mode fiber optic cable, Multi-mode fiber optic cable 50/125µm, Cat6 copper cable

Where does horizontal cabling extend from?

This horizontal cabling extends from the Telecommunications Room and goes out to individual work areas

What are some of the horizontal distribution pathways?

Junction box, Conduit pathways, Cable tray, Space cable supports, Ceiling conduits and cable trays, No splices shall occur in any cables between the termination points

What should be planned for each room in terms of TV outlets?

At least one TV outlet box shall be planned for each room.

What should wall plates have in terms of barrel splice?

Wall plates shall have 75 ohms barrel splice “F”, both ends 3/8”-32 threads per inch mounted in the center.

What does CATV stand for?

CATV – Community Antenna Television It refers to a system where a central antenna is used to broadcast television signals to multiple viewers in a community through coaxial cables. This system became popular in the mid-20th century as a way to improve TV reception in areas with poor signal quality.

What is the CATV architecture in the United States?

54 MHz to 1002 MHz

What is the CATV architecture in the Philippines?

54 MHz to 806 MHz

What the set-top box CATV?

(5-1002) MHz

What is the location where all the signals are received and gathered for distribution to the subscribers?

Head End

What are the CATV head-end processes?

Signal Reception, Signal Processing: demodulation, decoding, and error correction, Channel Selection and Multiplexing, Analog to Digital Conversion, Encryption and Conditional Access, Insertion of Local Content and Advertisements, Signal Amplification and Distribution

How far away are geostationary satellites?

36.000 km

What are Optical Nodes?

Optical nodes are devices used to convert optical signals to electrical signals (and vice versa) for distribution over a fiber optic network.