ITU grid

Question 0

How many channels in the ITU grids

Answer 0

72

Question 1

Name three kinds of spacing in the ITU grid

Answer 1

50 ghz 100ghz 200 ghz

Question 3

Where does the red band start?

Answer 3

1546.12 nm and higher.

Question 4

Where does the blue band start?

Answer 4

1546.12 nm and lower

Question 4

What times what equals the speed of light

Answer 4

Terra hertz frequency of the wave times the ITU designation.

192.1 x 1550.92 = speed of light

Question 5

1550.92 is an example of what kind of spacing

Answer 5

Red wave

Question 6

How many channels in the L band?

Answer 6

?

Question 7

How many channels are in the C band?

Answer 7

72

Question 8

What is the acronym for the different channels

Answer 8

Our Excellent soldiers can lick yours ??

Question 9

Channel 1531 is in which band?

Answer 9

?

Question 10

1550.92 is in which band

Answer 10

?

Question 11

1625 is in which band?

Answer 11

?

Question 12

How fast is the speed of light?

Answer 12

?

Question 13

How many channels are in the C band?

Answer 13

?

Question 14

How many channels in the L band?

Answer 14

?

Question 15

What does ITU stand for?

Answer 15

?

Question 16

What is the range of the L band?

Answer 16

L-Band: 1571nm to 1611nm

Question 17

What is the range of the C band?

Answer 17

C-Band:1531nmto 1570nm

Question 18

Name all of the bands.

Answer 18

O, E, S, C, L

Question 19

What does the C in CWDM stand for?

Answer 19

Coarse

Question 20

What is the channel spacing in nm for the C band?

Answer 20

The spacing is 20nm

1270nm -> 1610nm

Question 21

What is the usual span limit for CWDM?

Answer 21

around 60km for a 2.5Gb circuit.

Question 22

Why can’t CWDM use EDFA amplifiers?

Answer 22

the signals are not spaced appropriately for amplification by EDFAs.

Question 23

EDFAs are effective for what wavelengths in the C band?

Answer 23

effective for wavelengths between approximately 1525–1565 nm (C band)

Question 24

EDFAs are effective for what waves in the L band?

Answer 24

effective for wavelengths between 1570–1610 nm (L band).

Question 25

What is an OSC Channel used for?

Answer 25

Optical Supervisory Channel (OSC). This is data channel which uses an additional wavelength usually outside the EDFA amplification band (at 1,510 nm, 1,620 nm, 1,310 nm or another proprietary wavelength). It can carry data, orderwire, network management, etc.

Question 26

Why do DWDMs have to maintain a more stable and tighter tolerance frequency than CWDM

Answer 26

The spacing is very close in DWDM systems, and a precision temperature control will help eliminate drift off of a very narrow frequency window.

Question 27

What does 3R mean?

Answer 27

Retime, Reshape, Retransmit.

Question 28

Whats a muxponder?

Answer 28

(Multiplexed Transponder) - It can do some simple time-division multiplexing of lower-rate signals into a higher-rate carrier within the system (a common example is the ability to accept 4 OC-48s and then output a single OC-192 in the 1,550 nm band).

Question 29

What does ROADM stand for?

Answer 29

Reconfigurable Optical Add Drop Multiplexer.

Question 30

Transceiver vs Transponder

Answer 30

A transponder can be made up of two transceivers placed after each other: the first transceiver converting the 1550 nm optical signal to/from an electrical signal, and the second transceiver converting the electrical signal to/from an optical signal at the required wavelength.

Question 31

What is a PhotoDiode?

Answer 31

It is a semiconductor device that converts light into current. The current is generated when photons are absorbed in the photodiode.

Question 32

What is the OTU2 rate?

Answer 32

10.70Gbps

Question 33

What is the OTU2e rate?

Answer 33

11.09Gbps - Transports a 10 Gigabit Ethernet local area network (LAN) PHY coming from IP/Ethernet switches and routers at full line rate (10.3 Gbit/s). This is specified in G.Sup43.

Question 34

What is OTU4 rate?

Answer 34

112Gbps - Transports a 100 Gigabit Ethernet signal

Question 35

What is OTU3 rate?

Answer 35

43Gbps | Transports an OC-768 or STM-256 signal or a 40 Gigabit Ethernet signal.[2]

Question 36

What are the typical signals an OTN at the Optical channel layer processes?

Answer 36

OTN SONET/SDH Ethernet/FibreChannel Packets

Question 37

Whats a key feature of OTN?

Answer 37

Offer transparent service delivery.

Question 38

Does OTN introduce Jitter or latency into the network?

Answer 38

OTN is an optical technology that introduces virtually no latency or jitter into the network. This increases application throughput, eliminates the need for constant network tuning and improves overall network performance.

Question 39

PMD stands for what?

Answer 39

Polarization Mode Dispersion.

Question 40

Describe PMD.

Answer 40

its a form of modal dispersion where TWO different polarizations of light in a waveguide, which normally travel at the same speed, travel at different speeds due to random imperfections and asymmetries, causing random spreading of optical pulses.