connectors and cables Flashcards
Twisted pair copper cabling
Balanced pair operation
Two wires with equal and opposite signals – Transmit+, Transmit- / Receive+, Receive-
Keeps a single wire constantly moving
away from the interference
The opposite signals are compared on the other end
Coaxial cables
Two or more forms share a common axis
RG-6 used in television/digital cable
– And high-speed Internet over cable
Plenum-rated cable
Traditional cable jacket - Polyvinyl chloride (PVC)
Fire-rated cable jacket
UTP (Unshielded Twisted Pair)
No additional shielding, The most common twisted pair cabling
STP (Shielded Twisted Pair)
Additional shielding protects against interference, shield each pair and/or the overall cable, requires the cable to be grounded
Direct burial STP
Overhead cable isn’t always a good option, put the cable in the ground
Provides protection from the elements
Optical fiber communication
Transmission by light
No RF signal
Signal slow to degrade
Immune to radio interference
Multimode fiber
Short-range communication
Relatively inexpensive light source
– i.e., LED
Single-mode fiber
Long-range communication
Expensive light source
– Commonly uses lasers
TIA/ETA 568A
White/green, green, white/orange, blue, white/blue, orange, white/brown, brown
Telecommunications Cabling Standard
Commercial Building
TIA/EIA 568B
white/orange, orange, white/green, blue, white/brown, brown
Telecommunications Cabling Standard (more traditionally used)
Commercial building
VGA (Video Graphics Array)
DB-15 connector
Blue color
Analog signal
HDMI (High-Definition Multimedia Interface)
Video and audio stream
19-pin (Type A) connector
DisplayPort
Digital information sent in packetized form
Compatible with HDMI and DVI
DVI (Digital Visual Interface)
Single and dual link
Single link; 3.7 Gbps (HDTV at 60 fps)
Dual link; 7.4 Gbps (HDTV at 85 fps)
No audio support
DVI-A (Analog signals)
DVI-D (Digital signals)
DVI-I (Integrated, Digital and analog in the same connector)
SATA
One power cable and data cable per device
eSATA cable
External device connections
Uses the SATA standard
Similar in size to SATA but connectors are physically different
The SCSI standard
Small Computer Systems Interface
Originally designed to string many peripherals
together onto a single cable/controller
Many different formats
Parallel and serial options
SCSI advantages
Not just for hard drives (Scanners, tape drives, CD-ROM drives)
Many devices on a single bus
Very intelligent interface functionality
Industry longevity
SCSI ID and logical unit (LUN)
Every SCSI device on a single bus is
assigned a separate ID number
Logical units (LUNs) are defined within each SCSI ID
The signal at the “end” of a physical SCSI bus is terminated
Serial attached SCSI (SAS) devices have no
jumpers, terminators, or settings
Serial attached SCSI
Move from parallel to serial
Point-to-point connection
No termination required
The control and management of SCSI
RJ11 connector
6 position, 2 conductor (6P2C)
Some cables will wire additional conductors
Telephone or DSL connection
RJ45 connector
Registered Jack type 45
8 position, 8 conductor (8P8C)
Modular connector - Ethernet
F-connector
Cable television
RG-6 cable - Threaded connector
Punchdown block
Wire-to-wire patch panel
Wires are “punched” into the block
Additional wires punched into connecting block
USB-C
24-pin double-sided USB connector (Used for both hosts and devices)
Used for USB, Thunderbolt
Interface is the same, signal can vary
Molex connector
4-pin peripheral power connector
Power for many devices in the computer case
Lightning
Apple proprietary
Some advantages over Micro-USB
Higher power output for phones and tablets
Can be inserted either way
DB-9
D-subminiature or D-sub
Commonly used for RS-232
Serial communications standard
Now used as a configuration port
M.2 interface
Smaller form factor - No SATA data or power cables
Can use a PCI Express bus connection
Different connector types – Needs to be compatible with the slot key/spacer
