多項選擇題

Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications.
What are two possible sources of trouble shown in the system？（）

A. fiber failure between Sites A and D
B. EDFA failure at Site A （clockwise direction）
C. EDFA failure at Site C （clockwise direction）
D. 15216 multiplexer at Site A （counter-clockwise direction）
E. OADM pass-through （West "OUT"） failure at site D （clockwise）
F. wavelengths 1 and 3 transmitter failures at Site A （clockwise direction）

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多項選擇題

What are two important considerations when using 2- or 4-channel 15216 OADMs？（）

A. All "Add" channels require uniform power levels.
B. The flexibility of wavelengths per OADM is limited.
C. It is easier to balance "Pass-Through" and "Add" channels.
D. There is lower pass-through loss using multi-channel OADMs.
E. You can extract a single channel without dropping other channels.

單項選擇題

Click the Exhibit button. What is the maximum allowable loss budget between the ONS 15216 Mux （left side） composite output and the ONS 15216 Demux （right side） composite input，
with the optical values given in the exhibit？（Assume the worst case loss of 4.5 dB for 15216 200 GHz Mux/Demux and ignore power penalties or extra margin.）（）

A. 15 dB
B. 17 dB
C. 21 dB
D. 26 dB
E. 27 dB

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Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications. What are two possible sources of trouble shown in the system？（）

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What are two important considerations when using 2- or 4-channel 15216 OADMs？（）

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Click the Exhibit button. The exhibit shows a 15454/15216 DWDM system and alarm indications.
What are two possible sources of trouble shown in the system？（）

What are two important considerations when using 2- or 4-channel 15216 OADMs？（）