Telecommunications Infrastructure (ICT) and Subscriber Line Setup

Subscriber Line Installation and Components

2.3.1 Internal Wiring Installation

The installation consists of the subscriber's internal wiring, comprising two parallel copper wires coated with a beige polyvinyl chloride (PVC) insulating cover.

Installation Requirements:

• Stapling for interior walls, with a distance between clamps of 50 cm.
• If two parallel cables are present, they must be stapled separately.
• The termination rosette wiring must include a reserve for future expansion.
• A safe distance of approximately 10 cm must be maintained between this wire and power cables.

2.3.2 Interconnection Elements: PTR and Rosettes

The subscriber's indoor installation begins at the Point of Network Termination (PTR) or Primary Connection Point (PCR).

The PTR is an element that marks the border between the subscriber's installation and the operator's network, helping to clarify responsibilities in case of failure.

Another type of PTR is the PCR/TL (Connection to Individual Telediagnosis).

The sliding cover of the PTR hides an RJ 11 female connector into which a telephone terminal can be connected. Opening the lid disconnects the subscriber's indoor installation, allowing verification of the telephone tone and fault isolation. If the subscriber's home does not have a dial tone, but the RJ 11 PTR does, the problem is clearly located in the subscriber's interior line.

The element that interconnects telephones within the subscriber's home is called the rosette.

Common Telecommunications Infrastructure (ICT)

ICT Network Domains and Responsibilities

An ICT network comprises three domains where components are located and responsibilities are defined:

• Public Domain Zone: Contains all network operators offering their services.
• Community Domain Zone: Includes the common building networks that allow users access to telecommunications services.
• User Domain Zone: The user's address, containing the internal networks.

ICT Network Subdivisions (Subnets)

An ICT network is divided into the following subnets:

1. Feeder Network (Access Network):

   This network is external to the building, through which operators provide services to users. Access to the building can take two forms:

   • Bottom of the building: Via twisted pair cable or fiber, accessing the Interconnection Point (IP) or Network Termination Point (PTR).
   • Top of the building: Using radio means that provide local loop access. These systems are known as Wireless Local Loop (WLL) and Local Multipoint Distribution Service (LMDS).
2. Distribution Network:

   Composed of multipair cables, allocating a pair of wires per user. This network is located in the main conduit (pipeline).

3. Dispersion Network:

   Formed by one or two pairs of interior grade wiring. It runs through the secondary conduit and connects to the user's internal network at the User Access Points (PAU).

4. User Internal Network:

   Consists of one or two pairs of cordset wiring, starting at the PAU and terminating at the Terminal Access Bases (BAT).