Modern Ethernet Flashcards
What are the two defining characteristics of Ethernet?
1 - Frame Size and elements
2- the way devices share access to the bus
Difference between baseband and broadband
Baseband means only a single signal travels over a wire at one time
broadband means multiple signals travel over a wire at one time
What does autosensing NIC, hub or switch do?
Determines both devices highest speeds
10BaseFX summary
Speed 100 mbps
signal type baseband
distance 2km
node limit 1024
topology star bus (physcal star, logical bus)
used multimode fiber and SC or ST connector
1000BaseT
Speed 1000 mbps signal type baseband distance 100km node limit 1024 topology star bus (physcal star, logical bus) Cat 5 or better
1000BaseSX
- multimode fiber
- 850nm
- variable, commonly LC
- 220-500m
1000BaseLX
- single-mode fiber
- 1300nm
- variable, commonly LC and SC
- 5 km
What are SFF Connectors?
- Small form factor
- MT-RJ and LC
- most popular type of fiber connectors
PC Connector?
- Physical contact connector
- two pieces of fiber touch when inserted
- replaced flat surface connectors
UPC Connector?
- ultra physical contact connector
- polished extensively for a superior finish
- reduces signal loss over PC connectors
APC Connector?
- angled physical contact connector
- add 8 degree angle
- lowers signal loss even further than UPC
Standard for media converters?
Gigabit Interface Converter (GBIC)
Smaller media converter?
Small Form-factor pluggable (SFP)
10GBaseSR
850nm
LAN
multimode fiber
26-300m
10GBaseSW
850nm
SONET/WAN
multimode fiber
26-300m
10GBaseLR
1310nm
LAN
single-mode fiber
10km
10GBaseLW
1310nm
SONET/WAN
single-mode fiber
10km
10GBaseER
1550nm
LAN
single-mode fiber
40km
10GBaseEW
1550nm
SONET/WAN
single-mode fiber
40km
10GbE
- previously called 10GBaseT
- on cat 6 - 55 m
- on cat 6a - 100m
What are MSAs
agreemtns among multiple manufacturers tomake interoperable devices and standards
SFP+
- enchanced Small form factor pluggable
- media converter for 10 GbE
What is WDM
- wave division multiplexing
- to differentiate wave signals on a single fiber
What is BiDi?
- Bidirectional trasceivers
- have only a single optical port to send on one wavelength and receive on another
- costs less to deploy
- can use existing fiber runs to double the capacity of the network
- typically use SFP
- 40GBase use Quad Small Form-factor Pluggable (QSFP)
How many pairs of wires do 10BaseT and 100BaseT use?
2
What standard does IEEE 802.3ab describe?
1000BaseT
Advantage of fiber?
not affected by EMI
