Migrating to High Performance LANs

Laboratory work 3

This week I would like you to investigate the properties of WAN carriers.

Use the Internet to do this. You may confer with each other to achieve the results.

Use this Nortel page as your starting point. Read the text and answer the folowing:

Make a table that displays the cost per bit offered by Nortel WAN delivery systems.

What is OC-192/TN-64X? 10 Gbps platform

What is the highest WAN data rate offered by Nortel? 40 Tbps

What is DWDM?

What optical carrier technology is DWDM coupled with to give a per-fibre transfer rate of 160 Gbps? SONET with integrated DWDM is the workhorse of carrier networks running at speeds up to 160Gbit/s per fiber (put DWDM into Nortel search engine)

What is a VPN? Virtual Private Network?

How could this benefit a traditional LAN with offices in many cities? Set up virtual LANs many miles apart interconnected by WAN carriers.

What is MultiLayer Switching (MLS)? You can use 3Com MultiLayer Switching to cost-effectively:

Enhance the capabilities of traditional network architectures
Gain immediate inter-subnetwork performance improvements
Permit gradual migration to new network technologies or flatter network architectures (if desired) without sacrifices
Scale your solutions to millions of packets per second of switching at Layer 2 or Layer 3
Provide nonblocking, wire-speed switching and routing on all ports for all network interfaces and protocols

What is 1000BaseT? 1000BASE-T is the latest in Ethernet technology. Ratified by the IEEE Standards Committee in June, 1999, this technology is designed to provide speeds of 1000Mbps over Category 5 copper cabling, the most widely installed LAN infrastructure. It addresses the exploding bandwidth requirements on current networks that are the result of implementing new applications and the increasing deployment of switching at the edges of the network

1000BASE-T technology used in a Gigabit Network provides a simple, cost-effective performance boost while continuing to use the dominant installed horizontal/floor cabling medium. It can be implemented in floor, building, and campus networks because it offers a wide range of connectivity media and connection distances.

Other key specifications of 1000BASE-T enhance its use as a cost-effective, non-disruptive, and high-performing technology:

1000BASE-T supports the Ethernet MAC, and is thusly backward compatible with 10/100 Mbps Ethernet

many 1000BASE-T products will support 100/1000 auto-negotiation, so 1000BASE-T can be incrementally deployed in a Fast Ethernet network

1000BASE-T is a high-performing technology with less than one erroneous bit in 10 billion transmitted bits (the same error rate as that of 100BASE-T)

Why does Gigabit Ethernet not really require CSMA/CD? This is a switched technology and so no collisions will ever take place in a totally switched environment.

Why is it still implemented? This is to allow connections to legacy slower Ethernet installations without any changes in MAC.

Bring a hard copy of the doc to your next lecture.