Summary
Highlights
Punchdown blocks are used to terminate large numbers of twisted-pair cables quickly and efficiently. Wires are rapidly punched into the block using a special tool, and internal metal contacts pierce the insulation to connect with the copper, making it an inexpensive solution for mass cable termination.
The RJ11 connector is a common 6-position, 2-conductor (6P2C) connector primarily used for analog telephone and DSL internet connections. Although variations with four conductors are technically RJ14, they are generally referred to as RJ11.
The RJ45, or Registered Jack type 45, is a larger 8-position, 8-conductor connector widely used for Ethernet networks, but also for serial and other connections. RJ11 and RJ45 connectors differ in size, making it possible to accidentally plug an RJ11 into an RJ45 port.
The F connector is a common coaxial copper connection used for cable television and cable modem connections. It features a threaded design to secure the connection and uses a single central copper conductor to send and receive signals, compliant with DOCSIS standards for cable modems.
Universal Serial Bus (USB) connectors have evolved. Older versions (USB 1.1/2.0) included Standard-A, Standard-B, Mini-B, and Micro-B plugs. USB 3.0 introduced different A, B, and Micro-B plugs. To simplify, USB-C was developed as a versatile physical connector capable of carrying various signals like USB, Thunderbolt, and HDMI.
The 4-pin Molex connector (also known as AMP Mate-n-Lok) is found in older desktops, providing 12-volt and 5-volt power to peripherals like fans and storage drives. These friction-fit connectors are modular and often included with power supplies.
The Lightning connector is Apple's proprietary connector for iPhones, iPads, and other devices. Introduced when Micro-USB was common, Lightning offered enhanced power capabilities and a reversible design. While USB-C is becoming standard, some Apple devices still use Lightning.
DB-9 connectors are used for serial communication (RS-232 standard) to connect to older networking equipment like switches, routers, and firewalls. Though USB is now common for serial communication, DB-9 remains essential for console port access on many infrastructure devices for configuration and troubleshooting.