CS610 Assignment No. 1 Solution

Q1. In which situation multiplexing is used? Explain with the help of working structure. Multiplexing is used for sharing of resources

1) Which cable is suitable for networking? Give reasons twisted pair 100baseT or 1000baseT

2) Which network Topology will be used with in the office and why?

star shaped bus

3) Which network Topology will be used for connecting two offices and why?

WAN

1) Which cable is suitable for networking? Give reasons LAN

4)Which network device will be used to connect two offices?

Fiber modem

for detail plz concerns hands out

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Under the simplest conditions, a medium can carry only one signal at any moment in time.

For multiple signals to share one medium, the medium must somehow be divided, giving each signal a portion of the total bandwidth.

Multiplexor (MUX)

Demultiplexor (DEMUX)

Sometimes just called a MUX

• Two or more simultaneous transmissions on a single circuit.

– Transparent to end user.

• Multiplexing costs less.

Frequency Division Multiplexing

Assignment of non-overlapping frequency ranges to each “user” or signal on a medium. Thus, all signals are transmitted at the same time, each using different frequencies.

A multiplexor accepts inputs and assigns frequencies to each device.

The multiplexor is attached to a high-speed communications line.

A corresponding multiplexor, or demultiplexor, is on the end of the high-speed line and separates the multiplexed signals

Time Division Multiplexing

Sharing of the signal is accomplished by dividing available transmission time on a medium among users.

Digital signaling is used exclusively.

Time division multiplexing comes in two basic forms:

1. Synchronous time division multiplexing, and

2. Statistical, or asynchronous time division multiplexing.

Synchronous Time Division Multiplexing

The original time division multiplexing.

The multiplexor accepts input from attached devices in a round-robin fashion and transmit the data in a never ending pattern.

T-1 and ISDN telephone lines are common examples of synchronous time division multiplexing

• Very popular

• Line will require as much bandwidth as all the bandwidths of the sources