FAS is the frame alignment overhead, with a length of 6 bytes, located in the 1st row and the 1st to 6th columns. The 1st to 3rd bytes are 3 OA1 bytes, each OA1 is always "1111 0110", which is F6 in hexadecimal. The 4th to 6th bytes are 3 OA2 bytes, each OA2 is always "0010 1000", which is 28 in hexadecimal.

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LDG supports electrical layer scheduling at the ODU1 level.

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The number of network elements (including REG) in a two-fiber bidirectional multiplex section shared protection ring can exceed 16.

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In Ethernet, the frame length has a lower limit, which is mainly due to the following considerations?

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When serious bit error seconds occur in the PM segment of ODUk, the network management will report the ODUk_PM_ES alarm.

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If a network port that supports auto-negotiation is connected to a network port that does not support auto-negotiation, half-duplex may be used instead of full-duplex.

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OSN 3500 has strong branch service up and down capabilities, with 16 branch outgoing line slots, 504 2M, 32 E4, 117 E3/DS3, 132 STW-1e up and down on a single subrack, providing STM-1/4/16/64 group rate.

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The levels of forced switching, fiber break switching, manual switching, and practice switching are arranged from high to low.

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Physical port: also known as MAC port, which is the external port of the board.

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Which of the following is not included in the basic architecture of MPLS L2VPN?

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