Tuesday, October 18, 2016

IPTV System

        IPTV ( Internet Protocol Television ) system
The Internet Protocol Television ( IPTV ) system shall provide satellite and off-air
Television content, video on demand via an IP-based streaming media system over the project campus network, IPTV content shall be accessed from network computers as well as set-top boxes deployed in designated areas.
Satellite dish antennas shall be fixed and mounted in an appropriate location of the project.
IPTV (Internet Protocol Television) is a method used for distributing television signals over an IP network. The selected range of TV channels is delivered to the property from the service provider either as a satellite or digital multicast streamed signal. At this point the streamed IP channels are fed to the network core switch and from there distributed to network outlets through the property via the building LAN.
The LAN design will be scaled to manage all required number of channels and will be capable of future expansion.
As the IPTV is a networked service, IP encoded television signals can be made available at any network point, however it is normal practice to segregate IPTV onto a VLAN and dedicated outlets would be provided for IPTV system.
The IPTV server and main equipment shall be located in the server room located at the terminal building
The location of dishes is not applicable to be installed over the roof of the terminal building, an appropriate location shall be selected at the site and to be near to the terminal building for the connection with core switches.
           IPTV system Components
          The system shall consist of but not limited to:

o   IPTV client workstation
o   Digital Content Manager (DCM)
o   HD Encoders
o   SD Encoders
o   Network Management System
o   Movie storage system for video on demand
o   Set-Top Boxes
o   Dish antennas
o   Fed horns and LNB's
o   Head end station compressing of:
-   Basic unit with slots
-   Channel processing modules
-   Integrated programmable input distribution panel (splitter)
-   Microprocessor based control unit
-   Power supply unit
-   19" steel rack cabinet to accommodate all main equipment
-   Coaxial cables network
-   Splitters and tap-off boxes
-   TV/FM sockets
-   Line / distribution amplifiers

Sunday, October 9, 2016

Structure Cabling systems

Structure Cabling systems
·         Is the infrastructure work inside building for IP systems such as ( telephone & data over IP, IP public address system, IP CCTV, IP Access control, IPTV, IP CLOCK,..... )
·         Note : Each system will be introduced in a separate post
Codes & standard
·         TIA/EIA 558
·         BICSI Standard
Structure Cabling components:
-          RJ45 outlet
·         An 8-pin/8-position plug or jack is commonly used to connect computers onto Ethernet-based local area networks (LAN). Two wiring schemes–T568A and T568B–are used to terminate the twisted-pair cable onto the connector interface (Wall mounted &  Floor mounted )

-          Cables
·         Fiber optic cable
-          There are two types for fiber cable :
-          Multi-mode
Multi-mode Fiber Patch Cables are a good choice for transmitting data and voice signals over shorter distances. They are typically used for data and audio/visual applications in local-area networks and connections within buildings or remote office in close proximity to one another,
Transmission speed are limited in multi-mode as follow:
100 Mbit/s for distances up to 2 km (100BASE-FX).
1 Gbit/s up to 1000 m.
10 Gbit/s up to 550 m

-          Single mode
Single-mode Fiber Patch Cables are the best choice for transmitting data over long distances. They are usually used for connections over large areas, such as college campuses and remote offices. They have a higher bandwidth than Multi-mode cables to deliver up to twice the throughput.

·         Unsheilded twisted pair cable UTP Cable
is the most common kind of copper in horizontal wiring for all systems based on IP technology , the benefits of twisted pairs is to reduce cross talk or electromagnetic interference between pairs.
-          types of Unsheilded twisted pair cable:
from CAT1 to CAT7
 ( all category will be introduced in a separate post in details)

-          Cable trunk
·         is an enclosure usually with a rectangular cross section, and with one removable or hinged side, that is used to protect cables from dust or water ingress.can be 1 or 2 or 3 compartment.

-          19- inch Rack 
·         is a standardized frame or enclosure for mounting multiple equipment modules. Each module has a front panel that is 19 inches (48.3 cm) wide. The 19-inch dimension includes the edges,
-          Fiber patch panel
·         Used to terminate fiber optic cables and provide access to the cable’s individual fibers for cross connection.

-          UTP patch panel
·      UTP Blank Patch Panel is designed to work with UTP high-density modular connectors. The modular connectors exceed all channel performance requirements in TIA-568-C.2 from 1 MHz to 500MHz to support the IEEE 802.an standard for 10 Gigabit Ethernet over UTP premise cable.

Thursday, October 6, 2016

Public Address system

The Public Address system shall be a complete system for amplifying sound signal from
microphones, background music source and distribute them to loud speakers at various
locations with provision to distribute sound on selective and zonal basis as shown on the
riser diagram.
-          Microphones ( wire & wireless )
·         Types:
-          Dynamic microphones
-          Condenser microphones
-          Ribbon microphones

·         Specification
-          Sensitivity
-          impedance

-          Speakers
·         3 types ( wall mounted, surface mounted & recessed mounted )
·         Cover area approximately about 30 meter square and located every 6 meter at corridor.

-          Amplifiers
-          is an active component that increases the output signal of a sound source (e.g. microphone) and passes its output signal to a sound transducer (e.g. loudspeaker).
-          Capacities
( 120w, 240w............)

-          Matrix
§  The main unit for the system which work as the interface between the system inputs as ( microphone, radio & CD player ) and the ouput units as speakers
-          FM\AM radio

-          CD\DVD Player

-          Volume control ( attenuator )
·         Located at closed rooms and it have different wattage capacities depend on number of speaker connected to volume control.

-          Network audio adaptor
·         Used only in IP public address

-          Rack
·         All previous devices will be located inside the rack which will be located in the main control room of the project

-          Types of cable used in public address system
·         Shielded twisted pair cable 2 x 1.5 mm   

-          Types of conduits  used in public address system
·         PVC Conduits
·         EMT Conduits used in Exposed installation when using public address in voice evacuation
·         UPVC Conduits used in outdoor installation
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