WAN Transmission Media Flashcards
What is the US standard of synchronous data transmission on optical fibre and what is it known as internationally?
SONET (synchronous optical network)
SDH (synchronous digital Hierarchy)
The optical carrier levels are multiples of the SONET base rate which is a throughput of what speed?
51.84Mbps (OC1)
What is the fastest Optical Carrier speed and what is the OC number?
- 813Gbps. OC-768
* it’s actually OC-3840 but according to the test questions it’s OC-768
What technology multiplexes several optical carriers on a single fibre?
Wavelength Division Multiplexing
What technology multiplexes within a specific band allowing use of erbium-doped fibre amplifiers to boost the signal?
Dense Wavelength Division Multiplexing
What 4 elements make up a DWDM system?
1) Terminal multiplexer
2) intermediate line repeater (every 80-100kM)
3) intermediate terminal multiplexer
4) terminal de-multiplexer
If cost is an issue which out of the two, DWDM (Dense Wavelength Division Multiplexing) or CWDM (Course Wavelength Division Multiplexing) would you choose to implement as a WAN transmission technology?
CWDM
What transmission media is point-to-multi-point, uses something called OTLs and ONUs and connects homes and businesses to the internet?
Passive Optical Network (Fibre to the premises)
OTL = Optical Termination Unit. ONU = Optical Network Unit
What is the speed range of passive optical networks?
155Mbps to 655Mbps
List the 3 types of satellite orbits.
1) Geostationary (orbits at fixed point above the earth)
2) Molniya (highly elliptical orbit that spends most time over northern hemisphere)
3) Low-polar and non-polar (orbits between the poles)
List the 3 levels and speeds of Optical Carriers under a Gig
1) OC-1 / 51.84Mbps
2) OC-3 / 155Mbps
3) OC-12 / 622Mbps
List the 3 levels and speeds of Optical Carriers over a Gig
4) OC-48 / 2G
5) OC-192 / 9G
6) OC-768 / 39G
