3.0PPP OPERATIONAL BACKGROUND

PPP is a protocol used for multi-plexed transport over a point-to-point link. PPP operates on all full duplex media, and is a symmetric peer-to- peer protocol, which can be broken into three main components: 1. A standard method to encapsulate datagrams over serial links; 2. A Link Control Protocol (LCP) to establish, configure, and test the data-link con- nection; 3. A family of Network Control Protocols (NCPs) to establish and configure different network layer protocols.

In order to establish communications over a point-to-point link, each end of the PPP link must first announce its capabilities and agree on the parameters of the link’s operation. This exchange is facilitated through LCP Configure-Request packets.

Once the link has been established and optional facilities have been negotiated, PPP will attempt to establish a network protocol. PPP will use Network Control Protocol (NCP) to choose and configure one or more network layer protocols. Once each of the network layer protocols have been configured, datagrams from the established network layer protocol can be sent over the link. The link will remain configured for these communications until explicit LCP or NCP packets close the link down, or until some external event occurs.

The PPP Bridging Control Protocol (BCP), defined in RFC 1638, config- ures and enables/disables the bridge protocol on both ends of the point- to-point link. BCP uses the same packet exchange mechanism as the Link Control Protocol (LCP). BCP is a Network Control Protocol of PPP, bridge packets may not be exchanged until PPP has reached the net- work layer protocol phase.

3.1 APPLICATIONS

In situations where a routed network requires connectivity to a remote Ethernet network, the interface on a router can be configured as a PPP IP Half Bridge. The serial line to the remote bridge functions as a Virtual Ethernet interface, effectively extending the routers serial port connec- tion to the remote network. The bridge device sends bridge packets (BPDU's) to the router's serial interface. The router will receive the layer three address information and will forward these packets based on its IP address.

Figure 1 shows a typical Cisco router with a serial interface configured as a PPP Half Bridge. The router serial interface uses a remote device that supports PPP bridging to function as a node on the remote Ethernet network. The serial interface on the Cisco will have an IP address on the same Ethernet subnet as the bridge.

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Patton electronic 2124, 2130 user manual PPP Operational Background, Applications
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2130, 2124 specifications

The Patton Electronics 2124 and 2130 are advanced solutions in the realm of networking, designed to enhance connectivity and support a variety of applications. Known for their robust performance, these devices are particularly useful in scenarios where reliable data transmission is essential, such as in telecommunications and enterprise network environments.

The Patton 2124 model serves as a versatile serial to Ethernet converter, allowing for seamless integration of legacy serial devices into modern IP networks. One of its standout features is the ability to support both asynchronous and synchronous communication protocols, making it suitable for diverse equipment and applications. It supports data rates up to 115.2 Kbps, ensuring high-speed data transfer. Additionally, the 2124 incorporates advanced error detection and correction mechanisms, which enhance data integrity and reliability during transmission.

On the other hand, the Patton 2130 model focuses on VoIP (Voice over Internet Protocol) connectivity, facilitating the transition from traditional telephony systems to IP-based communication. This model supports multiple VoIP standards, including SIP (Session Initiation Protocol) and H.323, making it compatible with a wide range of VoIP applications and services. The 2130 also features high-definition voice codecs, which improve call quality, and a built-in echo cancellation function that minimizes audio distortion during calls.

Both models leverage Patton’s innovative SmartNode technology, which streamlines management and monitoring through web-based interfaces. This capability enables users to configure settings, monitor performance, and diagnose issues remotely, enhancing the overall efficiency of network operation. They are equipped with various interfaces including Ethernet ports, serial ports, and options for multi-port configurations, catering to different deployment scenarios.

Moreover, the rugged design of the 2124 and 2130 models ensures durability in demanding environments. They are built to withstand a range of temperatures and can be mounted in various configurations, adding flexibility to installation options. Power over Ethernet (PoE) support in these models simplifies installation by eliminating the need for separate power supplies.

In summary, the Patton Electronics 2124 and 2130 represent a blend of reliability, versatility, and cutting-edge technology, making them ideal choices for organizations embracing modern networking needs. Whether integrating legacy systems or enhancing VoIP capabilities, these devices are poised to meet the diverse requirements of today’s digital landscape.
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