Ethernet Transport Applications in Objective-C

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Ethernet Transport Applications
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A few common applications for Ethernet transport are described here:
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Enterprise LAN extension Today, network nodes on a LAN must be in close physical proximity due to the distance limitations of the underlying Ethernet technology The inability to add remote nodes to a LAN is strictly a matter of transmitting the Ethernet frames and is not an inherent limitation in the network protocols or other scaling issues An enterprise with facilities in multiple locations may wish to share resources between the locations A simple solution from the LAN manager s perspective may be to connect the LANs using an Ethernet port as though they were not in separate locations Enterprise to Internet service provider connection A typical enterprise LAN network is comprised of nodes interconnected by Ethernet ports Other technologies such as Fiber Distributed Data Interface (FDDI) and token ring are also in use, but Ethernet is by far the most widely deployed Regardless of the LAN protocol in operation, the enterprise s connection to its ISP is typically of another variety Because the ISP s router is located at a remote location, the ISP connection must use the existing TDM network to make the connection Therefore, both the enterprise router and the ISP s router must use a more expensive TDM port If it were possible to transmit Ethernet directly to the ISP s router, both of the routers could use a more economical Ethernet port, and the network managers would not have to deal with TDM ports ISP router interconnection The any-to-any connectivity of the Internet is created by a vast network of interconnected routers An ISP s routers are interconnected, and the ISP s network is interconnected, or peered, with other ISPs and service provider networks When these routers are in close physical proximity, they can be interconnected with Ethernet ports When they are not in close physical proximity, they must be interconnected with TDM ports such as Packet over SONET This connection is more expensive and often at a relatively low data rate A simple and economical solution from the perspective of the ISP is to utilize Ethernet ports for all connections regardless of physical distance
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Today there are several options for services supporting Ethernet beyond the LAN Three common options will be described The first option is router-based; the service provider installs an Internet Protocol (IP) router with TDM ports in each location, as shown in Figure 1010a The TDM ports (DS1s or DS3s) use the copper infrastructure to connect to the nearest service provider Point of Presence (POP) A service provider s router running many high-layer protocols must be installed and provisioned to deliver Ethernet frames from one point to another The router provides the Ethernet port for the service connection and TDM ports to interface to the transport network This gives the service provider a presence at the customer location and the ability to provide managed services A protocol such as MultiLink Point-to-Point (MLPPP) may be required in order to utilize the bandwidth on multiple TDM ports If the goal is simply to interconnect two LANs, this is an expensive and complicated solution for a very simple task The second option is fiber based This simple option bypasses any existing infrastructure An Ethernet extension device is installed at each enterprise location and an optical fiber is patched together between the locations, as shown in Figure 1010b Major issues include the fiber connectivity requirement and distance limitation
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SONET/SDH TRANSPORT NETWORK
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(a) Router with TDM ports
Optical transceiver
Optical transceiver
(b) Ethernet extension over fiber NEXT GENERATION SONET/SDH TRANSPORT NETWORK
MSPP MSPP
MSPP
(c) Ethernet utilizing MSPP Figure 1010 IP Router with TDM ports
TDM: Circuit Bonding
A third option is based on a multi-service provisioning platform (MSPP) The MSPP is basically a Synchronous Optical Network (SONET) or Synchronous Digital Hierarchy (SDH) Add/Drop Multiplexer (ADM) designed to support standard TDM services as well as data services such as Ethernet The MSPP is connected to the service provider network by optical fiber, which once again limits its deployment MSPPs are typically deployed with SONET/SDH ring architectures, as shown in Figure 1010c New equipment build-outs by service providers will use MSPP devices However, it is expensive to replace existing SONET/SDH equipment with MSPP devices If the goal is to provide Ethernet connectivity, and capacity is available in the existing transport infrastructure, an overlay network of MSPPs will be very costly compared to using the existing network to support the service Each of the Ethernet connectivity solutions described here may be perfectly acceptable, or even ideal, for certain applications and deployments In order for Ethernet transport to reach its full potential, however, service providers must be able to reach all customers, whether connected by copper or fiber, with the desired bandwidth Solving this problem is the initial focus of a transport solution using circuit bonding
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