17.SONET/SDH

In SONET each frame lasts _______ microseconds.

• 20
• 64
• 125
• none of the above

A linear SONET network can be __________.

• multipoint
• point-to-point
• either (a) or (b)
• neither (a) nor (b)

The path overhead consists of ______ bytes.

• 18
• 9
• 6
• 1

_______ is a standard developed by ITU-T.

• SONET
• SDH
• either (a) or (b)
• neither (a) nor (b)

A ______ is the portion of the network between two multiplexers.

• line
• path
• section
• none of the above

A ________ is a repeater.

• ADM
• regenerator
• STS multiplexer/demultiplexer
• none of the above

The ______ layer is responsible for the movement of a signal across a physical section.

• path
• section
• photonic
• line

In ______ APS, there is one working line and one protection line. The data are normally sent on the working line until it fails.

• one-to-one
• one-plus-one
• one-to-many
• none of the above

Line overhead consists of ________ bytes.

• 18
• 9
• 6
• 1

In SONET, for each frame, the bytes are transmitted __________.

• from left to the right, bottom to top
• from left to the right, top to bottom
• from right to the left, top to bottom
• from right to the left, bottom to top