Exam 8: Multiplexing

Synchronous time division multiplexing can be used with ________ signals.

With ________,the outgoing data rate of the multiplexer,excluding framing bits,is higher than the sum of the minimum instantaneous incoming rates.The extra capacity is used by stuffing extra dummy bits into each incoming signal until its rate is raised to that of a locally generated clock signal.

In TDD,data are transmitted in both directions at the same time.

In ________ modulation,each signal occupies a distinct frequency band so these signals can be combined by simple addition to produce the composite signal for transmission.

The schemes for providing high speed digital transmission of the subscriber line are collectively referred to as ________.

A __________ is a device that allows a user to access the Internet and other online services through a cable TV network.

With time division multiplexing,modulation equipment is needed to move each signal to the required frequency band and multiplexing equipment is needed to combine the modulated signals.

From the carrier's central office to the customer's site is ________.

________ uses multiple carrier signals at different frequencies,sending some of the bits on each channel.The modem sends out test signals on each subchannel to determine the signal-to-noise ratio.The modem then assigns more bits to channels with better signal transmission and less bits to channels with poorer signal transmission.

A generic term for sharing the capacity of a data link is ________.

Each modulated signal requires a certain bandwidth centered on its carrier frequency and referred to as a ________.

With ________ multiplexing data from various sources are carried in repetitive frames.

Multiplexing allows several transmission sources to share a larger transmission capacity.

ADSL uses ________ multiplexing to exploit the capacity of twisted pair.

The two most common forms of multiplexing are frequency division multiplexing and ________.

________ is a modern technology designed to provide high speed digital data transmission over ordinary telephone wire.

Synchronous TDM is called synchronous because synchronous transmission is used.

In FDM,because multiple carriers are to be used,each is referred to as a ________.

The disadvantage of using echo cancellation is the need for ________ logic on both ends of the line.

________ was developed in the late 1980s by BellCore to provide a more cost effective means of delivering a T1 data rate.