Podcast
Questions and Answers
The most widely used serial interface is known as ______.
The most widely used serial interface is known as ______.
RS232
The V.35 interface is designed to support higher data rates and connectivity between DTEs and ______.
The V.35 interface is designed to support higher data rates and connectivity between DTEs and ______.
DCEs
The ______ is the information to be communicated.
The ______ is the information to be communicated.
message
The procedural specifications for RS232 are defined under ______.
The procedural specifications for RS232 are defined under ______.
The device that sends the data message is known as the ______.
The device that sends the data message is known as the ______.
The device that receives the message is called the ______.
The device that receives the message is called the ______.
V.35 can theoretically support cable distances up to ______ feet.
V.35 can theoretically support cable distances up to ______ feet.
The physical path by which a message travels from sender to receiver is known as the ______.
The physical path by which a message travels from sender to receiver is known as the ______.
The electrical specification for RS232 is outlined by ______.
The electrical specification for RS232 is outlined by ______.
Protocols are the rules and conventions used to exchange information in a Data Communications ______.
Protocols are the rules and conventions used to exchange information in a Data Communications ______.
The modified version of the SOS signal was used by Friedrich Gerke on German ______.
The modified version of the SOS signal was used by Friedrich Gerke on German ______.
The Dial Up Half Duplex Procedure involves sending a ______ signal when a call is made.
The Dial Up Half Duplex Procedure involves sending a ______ signal when a call is made.
Data communications involve the exchange of data between two devices via some form of ______.
Data communications involve the exchange of data between two devices via some form of ______.
Most commonly, V.35 is used for data rates of ______ and 64kbps.
Most commonly, V.35 is used for data rates of ______ and 64kbps.
The SOS signal can be sent in various ways, including keying a radio on and off, flashing a ______, and toggling a flashlight.
The SOS signal can be sent in various ways, including keying a radio on and off, flashing a ______, and toggling a flashlight.
Modern LAN routers often come equipped with a V.35 electrical ______.
Modern LAN routers often come equipped with a V.35 electrical ______.
Computers require ______ to interact with peripherals.
Computers require ______ to interact with peripherals.
The SOS signal is a prosign and is sent without ______ between characters.
The SOS signal is a prosign and is sent without ______ between characters.
The Baudot code, named after Emil Baudot, was first used in the ______.
The Baudot code, named after Emil Baudot, was first used in the ______.
Data need to be secured and ______ between devices.
Data need to be secured and ______ between devices.
Baudot code is a fixed length ______-bit code used for telegraph.
Baudot code is a fixed length ______-bit code used for telegraph.
Baudot code can expand its capability to ______ characters using control characters.
Baudot code can expand its capability to ______ characters using control characters.
The symbol rate measurement in Baudot code is known as ______.
The symbol rate measurement in Baudot code is known as ______.
Baudot's 5-bit code was adapted for manual keyboard entry, operated by fingers of both the left and ______ hand.
Baudot's 5-bit code was adapted for manual keyboard entry, operated by fingers of both the left and ______ hand.
USB 4 supports up to ______ Gbit/s throughput.
USB 4 supports up to ______ Gbit/s throughput.
USB Type ______ is used to connect with a PC.
USB Type ______ is used to connect with a PC.
The transfer mode for 10 Gbit/s is called SuperSpeed USB ______.
The transfer mode for 10 Gbit/s is called SuperSpeed USB ______.
USB Type ______ is specifically used for smaller peripherals.
USB Type ______ is specifically used for smaller peripherals.
The ______ connector is a smaller version of Type A and B, intended for mobile equipment.
The ______ connector is a smaller version of Type A and B, intended for mobile equipment.
USB connections are ______, meaning they have designated host and device relationships.
USB connections are ______, meaning they have designated host and device relationships.
USB Mini B has ______ pins to support On-the-GO (OTG) connection.
USB Mini B has ______ pins to support On-the-GO (OTG) connection.
The deprecated mini size was replaced by the ______ connector.
The deprecated mini size was replaced by the ______ connector.
A straight-through serial cable is often used with a ______ modem adapter.
A straight-through serial cable is often used with a ______ modem adapter.
Parallel data transmission allows more than one ______ to be transmitted at the same time.
Parallel data transmission allows more than one ______ to be transmitted at the same time.
The IEEE 1284 standard defines bi-directional parallel communications between computers and ______ devices.
The IEEE 1284 standard defines bi-directional parallel communications between computers and ______ devices.
The Compatibility Mode of IEEE 1284 is a ______-directional implementation.
The Compatibility Mode of IEEE 1284 is a ______-directional implementation.
Nibble Mode allows the transmission of data in ______ bits at a time.
Nibble Mode allows the transmission of data in ______ bits at a time.
Parallel data transmission is more costly compared to ______ data transmission.
Parallel data transmission is more costly compared to ______ data transmission.
Examples of parallel data transmission include the parallel printer port (Centronics) and ______ Bus inside the computer.
Examples of parallel data transmission include the parallel printer port (Centronics) and ______ Bus inside the computer.
The Centronics port was widely used before and after the ______ standardization.
The Centronics port was widely used before and after the ______ standardization.
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Study Notes
Five Components of Data Communications
- Message: Refers to the information transmitted, which may include text, numbers, images, audio, and video.
- Sender: The device that originates the message, examples include computers, workstations, and cameras.
- Receiver: The device that accepts the message, examples include computers, telephones, and televisions.
- Transmission Medium: The physical pathway for message travel, examples are twisted-pair wires, coaxial cables, fiber optic cables, and radio waves.
- Protocols: Set of rules guiding information exchange in data communications.
Importance of Data Communications
- Essential for computers and electronic devices to communicate with each other and peripherals.
- Ensures secure and effective data delivery between devices.
- Functional specifications dictate data, control, timing, and electrical ground signals.
- Procedural specifications outline the transmission sequence of data.
Serial Interface Standards
- RS-232:
- Widely adopted serial interface standard first issued by EIA in 1962.
- Covers mechanical, electrical, functional, and procedural aspects.
- V.35:
- High-speed serial interface supporting both data terminal equipment (DTE) and data communication equipment (DCE).
- Commonly used for data rates of 56kbps and 64kbps, with potential for higher speeds.
- Cable distances can reach up to 4000 feet (1200 m) depending on equipment and cable quality.
Baudot Code
- Developed by Emil Baudot, it's a 5-bit fixed length code for telegraphs.
- Utilizes control characters to expand its capability to 58 characters.
- Known as the International Telegraph Alphabet No. 1 (ITA1) but is no longer widely utilized.
USB Standards and Connectors
- Thunderbolt 3:
- Supports 40 Gbit/s throughput and is compatible with USB 3.2 and USB 2.0.
- Allows sharing a high-speed link with multiple device types dynamically.
- USB Type-A and Type-B:
- Type-A connects to PCs (downstream) while Type-B connects to smaller peripherals (upstream).
- Mini and Micro USB:
- Mini Type A/B connectors were common but now deprecated in favor of the more compact Micro USB and Type-C connectors.
- OTG (On-The-Go):
- Mini USB connectors include an additional pin to support dual-role functionality.
Parallel Data Transmission
- Involves transmitting multiple bits simultaneously over multiple communication links.
- Faster than serial transmission, but also more costly and suited for short distances.
- Examples include the Centronics port (parallel printer) and the data bus within computers.
IEEE 1284 Parallel Printer Standard
- Defines bi-directional parallel communications, initially developed by Centronics in the 1970s.
- Compatibility Mode (SPP): A uni-directional mode primarily used for printers.
- Nibble Mode: Transmits data four bits at a time using status lines for data transfer.
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