Flashcards in cct4 Deck (237)
What wireless adapter is credit-card sized wireless adapter that slides into the side of a laptop or desktop?
PC (PCMCIA) Card
What troubleshooting utility can you use in order to determine the computer's IP address, and to reset the address if the computer cannot connect to the Internet?
Which Business Class Internet optional feature allows customers to operate VPN or Web and E-Mail servers without the fear of interruption?
Static IP Addresses
How does a technician initiate a telnet session?
In the command prompt, type in Telnettype open and the (cm ip address)Enter username: msoEnter password: (password of the day)
What command in telnet will allow a technician to packet sniff both upstream and downstream for 3 seconds in Comcast's format?
sniff u+d 3 1
What does a technician type to display the existing NAT session log in a telnet session?
In a telnet session, what does a technician type to show the current dhcp lease info, including the IP, MAC and status of the private LAN?
What calling feature allows different phone numbers to reach the same phone line with different ring patterns?
A process that diverts a portion of the multiplexed aggregate signal at an intermediate point, and introduces a different signal for subsequent transmission in the same position.
Drop and Insert
A mathematical value derived from the number and severity of leaks in the cable system.
Cumulative Leakage Index (CLI)
How often is a CLI test performed?
What 2 ways can a CLI test be performed?
ground based or an aerial "flyover"
How long must leakage logs be kept on file?
At least 2 years
At what interval is CLI monitored?
FCC regulations requires a CLI figure of merit of what number?
64 or less
What is the most common cause of signal leakage?
poorly installed F-connectors in the drop
Carrier-to-beat rations greater than ______ are far enough below desired carrier level to be of little concern to the average viewer.
This appears when ingress allows a locally broadcast TV channel's signal to enter the TV along with the channel's signal supplied by the network.
This is usually caused by a reflection on the cable system caused by poor directivity at the tap or device feeding the set.
In cable systems it us usually caused when the same channel from two (or more) different TV stations is received by the same antenna.
Carrier-To-Noise Rule 1
If the input level (in dBmV) numerically equals an amplifier's NF, the output C/N will always e 59.2 dB.
Carrier-To-Noise Rule 2`
For each dB the input level is raised above the amplifier's NF, the output C/N improves by an equal amout above 59.2
Carrier-To-Noise Rule 3
C/N at the output of a single amplifier is always worse than that at the input by an amount equal to the amplifier's NF.
These are an undesired change in the waveform of a signal.
This is literally the "crossing" of modulation from one channel to another
Cross Modulation (XMOD)
For systems carrying forty or more channels, what distortion becomes visible before XMOD?
composite triple beats (CTB)
This appears as a horizontal bar moving from the bottom to the top of the picture
A primary source of hum modulation
power passing chokes used in passive devices
It is a source of hum modulation found in older systems.
using series regulated DC power supplies in the amplifier housings.