capter 16 Flashcards
what is Customer premises equipment (CPE)?
577
Customer premises equipment (CPE) is service provider equipment that is located on the customer’s premises (physical location) rather than on the provider’s premises
what is channel service unit / Data service unit ( CSU/DSU)
577
A layer 1 device that performs both the channel service unit (CSU) and data service unit (DSU) functions. it connects the serial ports on the customer’s router to the provider’s network
smart jack/ NIU
578
it is installed between the demarcation and the CSU/DSU, it convert codes and protocols into something the customer’s equipment required.
central office ( CO ) 579
is a phone company that connect the customer network to the provider’s switching network.
3 types of WAN connection, what are they?
580
- dedicated lines ( leased)
- Circuit switching
- Packet switching
dedicated lines ( leased)
580
it is a point to point, it uses synchronous serial lines up to 45Mbps, uses high level data link Control ( HLDC ) and Point to point protocol ( PPP )
Circuit switching
581
low cost, uses dial-up modems or ISDN, it is used for low-bandwidth data transfers.
Packet switching
581
this method allows the user to share bandwidth with other users to save money, but it is very slow.
what is the slowest WAN connection?
581
dial-up connection is the slowest.
what is the sped of modern dial-up modems?
581
the theoretical speed is 56Kbps.
what is Synchronous transmission?
Synchronous transmission is a process where data is transferred in regular intervals that are timed by a clocking signal; allowing for a constant and reliable transmission for time-sensitive data, such as real-time video or voice.
what is asynchronous?
asynchronous is a data transmission where the communication can start and stop at any time. Data sent through an asynchronous transmission contains a start bit and stop bit, helping the receiving end know when it has received all of its data.
what are T series connections?
582
they are digital connection that we can lease from the telephone company, we use them for leased lines that provide synchronous connection between sites.
T1 is the basic of the T series connections, it serves 24 digital signal 0 ( DS0). what is the maximum speed of T1?
582
1.544 Mbps
what is synchronous optical network ( SONET)
585
is the standard of synchronous data on optical fiber
what is the European version of the T1?
583
it is E1, and it operates at 2.048 and uses 32 channels of 64Kbps. uses DS1
what is the Japanese version of T1?
583
it is J1, it operates at 1.544Mbps
The T3 connection:
584
it is a 44.736Mbps = 28T1 and 672DS0 channels.
uses DS2
Wavelength Division Multiplexing, WDM :
585
Wavelength Division Multiplexing, WDM is a technology that multiplexes several carriers on a single optical fiber by using different wavelengths.
what is PON ?
586
A passive optical network (PON) is a new option for network connecting home and business to the internet, it uses point-to-multipoint fiber to the end-points in which unpowered optical splitters are used to enable a single optical fiber to serve multiple end-points.
what is the downlink and the uplink speed of the PON?
586
downlink is from 155Mbps to 655Mbps.
the uplink speed is 155Mbps
what are some of the wireless types?
586
Bluetooth.
Microwave radio relay.
A communication satellite.
Microwave radio relay transmit digital and sometime analog signals. T/F
787
True
DSL:
588
Digital Subscriber Line, DSL is a method of having high-speed access to the Internet over standard copper lines.
the digital information is sent over a high bandwidth channel above the baseband voice channel on a single pair of wires.
Cable modems:
588
this broudband service sends Ethernet digital signals over a cable modem.
