1.      It is cheap.

2.      It have high circuits utilizations.

3.      High network availability.

4.      It supports vide veriety of application transports and meet the throughput requirements.

5.      It offers high speed and lower delay as compared to X.25.

1.      It have a minimum data rate of Mbps.

2.      It allows variable length flows.

3.      It creates varying delays for different users

1.      It is faster

2.      It is less expensive

3.      It is easier to maintain.

4.      It is unaffected by radio interferences.

1.      the poor support for voice and video traffic

2.     the tethering of portable, wireless devices

3.     the installation of the network.

1.     It supports voice and vedio services on a network.

2.     It provides the multiple service support.

3.     It supports delay close to that of dedicated services

4.     It deals with the broad range of delay tolerance and loss performance through the implementation of multiple classes

5.     It have capability to support both connection-oriented and connectionless traffic

6.     Its Cables are based on twisted pair, coaxial or fiber-optic

7.     It have ability to connect LAN to WAN

8.     High speed Mbps and possibly Gbps

1.     Flexible to efficiency’s expense, at present,

2.     It uses 100 Mbps

3.     Presently the applications that can benefit from ATM such as multimedia are rare.

It really comes down to what you need and how much you want to spend.

In closing, Ethernet comes in three different flavors: Ethernet (10Mbits), Fast Ethernet (100 Mbits) and Gigabit Ethernet (1000 Mbps). These three are the most common speeds, but you can also get 10 Gpbs using the latest high-end switches available on the market.

So, as you can see, for LAN environments, we have a number of Ethernet speeds available and generally LAN speeds are always much greater than WAN link speeds and the cost is much smaller

The selection between frame relay and ATM as a WAN protocol depends on your company's needs, budget and of course -- your provider's ability to provide you with such links. ATM provides robustness, high speeds and flexibility that frame relay can't match. However, for small speeds links, some companies prefer frame relay because it turns out cheaper and suites them better.

It really comes down to what you need and how much you want to spend.

In closing, Ethernet comes in three different flavors: Ethernet (10Mbits), Fast Ethernet (100 Mbits) and Gigabit Ethernet (1000 Mbps). These three are the most common speeds, but you can also get 10 Gpbs using the latest high-end switches available on the market.

So, as you can see, for LAN environments, we have a number of Ethernet speeds available and generally LAN speeds are always much greater than WAN link speeds and the cost is much smaller.

CONS: Jam occur; no guaranteed bandwidth

ATM,
PROS : Higher transmission speed
CONS : Complexity

Gigabit Ethernet,
PROS : High speed, small cost
CONS : Not suitable for traffic intensive applications.

PROS:
1.  It is optimized to transport voice, data and video i.e. single network for everything. It is used for mixed traffic, real-time and non real time traffic types. 
2. It is easy to integrate with LAN, MAN and WAN network types i.e. seamless integration. 
3. It is QoS oriented and high speed oriented. 
4.  It enables efficient use of network resources using bandwidth on demand concept. 
5. It uses simplified network infrastructure. 

 

1. Overhead of cell header (5 bytes per cell) 

2.Complex mechanisms are used to achieve QoS. 
 3.Congestion may cause cell losses 
 4.ATM switch is very expensive compare to LAN hardware. Moreover ATM NIC is more expensive compare to ethernet NIC. 
 5.As ATM is connection oriented technology, the time required for connection setup and tear down is larger compare to time required to use it.

 

1.      Gigabit Ethernet are faster

2.      Frame rate of 1,000,000,000 bits per second

3.      Less expensive

4.      LAN oriented

5.      Easier to maintain

6.      There is a wide variety of hardware and software

7.      Uninfluenced by radio interference.

8.      Different Varieties

1.  Products are not yet available

2.  Gateway device necessary to interface to wide area link protocol

3.  Ethernet does not support time-sensitive data

1.      Savings over private lines

·         Reduces number of dedicated devices which reduces equipment cost

·         Reduces complexity for Network Managers

2.      Greater bandwidth flexibility than private lines

3.      Higher reliability and Resiliency than private lines.

4.      Lower cost of ownership and better bandwidth utilization.

·         Growth of branch of Office Network.

5.    Higher network availability: FR network employs switches that support automatic routing of PVC around circuit failure

1.       44.736 Mbps data rate is not enough for protocols with higher data rates

PROS OF ATM

·         ATM supports voice, video and data allowing multimedia and mixed services over a

Single network. 

·         Provides the best multiple service support. 

·         Supports delay close to that of dedicated services. 

·         Ability to connect LAN to WAN.

·         Scalability.

·         Higher aggregate bandwidth

·         High speed Mbps and possibly Gbps

 

 

·         Flexible to efficiency’s expense, at present, for any one application it is usually possible to find a more optimized technology 

·         Cost, although it will decrease with time 

·         New customer premises hardware and software are required  Competition from other technologies -100 Mbps FDDI, 100 Mbps Ethernet and fast Ethernet 

·         Presently the applications that can benefit from ATM such as multimedia are rare 
 The wait, with all the promise of ATM’s capabilities many details are still in the standards process

 

 

PROS OF GIGABIT ETHERNET.

 

1.      Gigabit Ethernet are faster

2.      Less expensive

3.      LAN oriented

4.      Easier to maintain

5.      Gigabit Ethernet is 100 times faster than the original 10Mbps Ethernet.

6.      Gigabit Ethernet is 10 times faster than 100Mbps Fast Ethernet

7.      Full-duplex capacity of Gigabit, allowing the effective bandwidth to communicate in both ways simultaneously, therefore it increases the transfer rate. 

8.       Increasing bandwidth for higher performance and elimination of bottlenecks.

9.      Backwards compatible in shared mode using carrier extension

10.  Extension of a well understood, well characterized network approach.

 

 

CONS OF GIGABIT ETHERNET 

 

1.      Products are not yet available

2.      Gateway device necessary to interface to wide area link protocol

3.      Ethernet does not support time-sensitive data