Telephony Concepts: Networks, Devices, and Digital Services
Telephone Network Fundamentals
Subscriber Loop (Local Loop)
The loop is the connection enabling communication within our telephone network. It is commonly known as a two-wire twisted copper pair.
Loop Types
- Multi-pair/Hybrid: A technology combining copper pairs and potentially coax, offering telephony, data return channels (e.g., for satellite TV), and value-added services.
- Wireless Local Loop (WLL): Transmits the telephone signal using radio waves between the subscriber and a base station.
Telephone
Read MoreSystem Programming Concepts: Roles, Areas, and Tools
What is a system?
A set of components that interact to achieve a common goal.
What is programming?
The process that converts system specifications into machine instructions to produce the desired results.
What is system programming?
A set of programs necessary for a computer to operate coherently and monolithically for its users.
What is the role of a programmer?
Programmers play a supportive role in maintaining the operating system software environment used by application programmers and computer operators.
Read MoreUnderstanding REBT Regulations: Key Definitions & Requirements
Understanding REBT Regulations
REBT (Reglamento Electrotécnico de Baja Tensión): This is the primary regulation for implementing low-voltage electrical facilities. Its fundamental objective is to ensure the safety of people and the proper operation of facilities through established technical standards.
BT (Baja Tensión – Low Voltage): This refers to the set of devices and circuits designed to produce, transform, transmit, or utilize electricity at voltages not exceeding 1000V AC or 1500V DC.
Personnel
Read MoreRTOS: Real-Time Operating Systems Explained
What are Real-Time Operating Systems (RTOS)?
📌 1. What are the structure and characteristics of Real-Time Operating Systems (RTOS)?
A Real-Time Operating System (RTOS) is an OS designed to process tasks within a specific time constraint, ensuring predictable and deterministic execution. The structure of an RTOS consists of a scheduler, task management, inter-task communication, memory management, and interrupt handling mechanisms. Characteristics of RTOS include determinism, fast task switching,
Read MoreCentralized Metering: Installation and Requirements
1. Can fuses be installed in a single referral?
Before the counter.
2. What is the minimum section of drivers used for the connection of measurement equipment?
6 mm2
3. What types of cables are used for connections of measuring equipment in counter centralization?
450/750 V, copper, class 2 according to UNE-21,022, insulated dry Extrude based mixtures or thermoplastic thermosets.
4. What color should the section of the cables used for command and control circuits in the centralization of counters be?
Neutral:
Read MoreCopper vs. Fiber Optic Cabling: Encoding, Security & Connectors
Copper and Fiber Optic Cabling: Encoding, Security & Connectors
Encoding Bits as Voltages
There are two primary ways bits are encoded as voltages, each with distinct characteristics:
- Non-Return to Zero (NRZ) Coding: In NRZ, a ‘0’ bit is represented by one voltage level, while a ‘1’ bit is represented by a different voltage level. The voltage remains constant during the entire bit time.
- Manchester Encoding: Manchester encoding uses transitions in voltage to represent bits. For example, a ‘0’ is