E-Tech Flashcards
DNS
Domain Name System
DHCP
Dynamic Host Configuration Protocol
RIP
Routing Information Protocol
IP
Internet Protocol
HTTP
Hypertext Transfer Protocol
HTTPS
Hypertext Transfer Protocol Secure
TCP
Transmission Control Protocol
RAM
Random Access Memory
ROM
Read Only Memory
Full Duplex
TX / RX at the same time
Half Duplex
TX / RX one at a time
SSH
Secure Shell
CDP
Cisco Discovery Protocol
SSD
Solid State Disk
NTP
Network Time Protocol
LAN
Local Area Network
NIC
Network Interface Card
Standard Telephone Frequency Range
300Hz - 3400 Hz
Cat5e Max Length
100 meters / 328ft
RJ45
Cat5E connectors
Plenum
Cable used inside walls in commercial installations, ducts, walls, and ceilings
Difference of Cat5 and Cat6
Cat6 can transfer more data, has more twists to reduce interference and crosstalk
POSR
Power On Stick Relay
RS232
Serial Cable
DP, VGA, HDMI, DVI
Video interfaces
CRC
Cyclic Redundancy Check
Power (Watts) Formula 1
Voltage x Current
Power (Watts) Formula 2
V(squared) / Resistance
Total Capacitance (Series)
1Cs = 1/C1 + 1/C2 + 1/C3 …etc.
Total Capacitance (Parallel)
Cp = C1 + C2 + C3 …etc
Network Hub
Node that broadcasts data to every computer or Ethernet-based device connected to it. (More cost effective)
Network Switch
Device that channels incoming data from any one of multiple input ports to the specific output port that will take it toward its intended destination.
Linux Commands - List Files/Directories
LS
Linux Commands - Format Disk
sudo mkfs
Windows Active Directory
Enables administrators to manage permissions and access to network resources.
Windows CMD - Clear Printer Spool
net stop printer spool
Windows CMD - List All Running Processes
net stat
Windows Server Backup Utility Location
< BackupStorageLocation >WindowsImageBackup< ComputerName >
Windows Server Change User Permissions Utility
Group Policy - “mmc”
Resistor Bands
Billy Brown Runs Over Your Garden But Violet Gray Walks
Black (0), Brown (1), Red (2), Orange (3), Yellow (4), Green (5), Blue (6), Violet (7), Gray (8), White (9)
Resistor Bands Multiplier
1, 10, 100, 1k, 10k, 100k, 1M, 10M, 100M, 1G
Resistor Bands Tolerance
Gold 5%, Silver 10%, No Band 20%
Formula to Find Watts
Watts = Amps x Volts
48v from 8 12v batteries
2 sets of 4 in series, both sets connected in parallel
Lead Acid Cell Nominal Voltage
2.2V
Linux Root User
Only user to make changes to system files and settings
28 Test
Laptop connects to WIU J8 Ethernet Port
Test 36
0.06 Shunt
AMT 23 #162
Audio-frequency Track Transmitters and Receivers, or Equivalent systems of like frequencies must be separated by length of case, or in separate housings. A receiver of less than 8kHz must be separated from unrelated transmitters of the same frequency by at least 10 miles or 2 sets of IJ’s. Changes must be approved by Office of Deputy Chief Engineer C&S.
Test 19
Fouling Circuits and Shunt Wires
Every 90 days
Test 23
Ensures that new installations or modifications to existing installations are operating as intended.
Test 28
At least every 90 days or new installations
To make sure transponders are in good condition and are capable of reading to trains.
To test that WIU is working as intended sending and receiving correct messages to trains.
Test 32
HotBox Detectors
Inspect every 30 days
Calibrate once a year
Dragging Equipment
Inspect every 30 days
Test at least once a year
What is DNS used for?
It gives names to IP addresses.
What is DHCP used for?
Automatically assigns IP addresses and other configurations to devices that connect to a network.
What is RIP used for?
Defines how routers should share information when moving traffic among an interconnected group of local area networks
What is SSH used for?
Allows users to securely connect to a remote server over an unsecured network
Difference between SSD and HDD
SSDs store data in flash memory, while HDDs store data in magnetic disks.
What is NTP used for?
Synchronizes computer clocks across a network with a central time source, usually Coordinated Universal Time (UTC)
Multi-mode Fiber Jacket
Orange
Multi-mode Fiber Bandwidth
850 - 1300nm
Single Mode Fiber Jacket
Yellow
Single Mode Fiber Bandwidth
1310 - 1550nm
More Bandwidth and smaller
Fiber Color Code #5
Slate/Gray
Optical Time-Domain Reflector
For testing the integrity of cables like splice loss, length, and finding faults
