2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product. This product has been thoroughly inspected and tested and is warranted for One Year parts and labor. If any questions arise during installation or use of the unit, contact Patton Electronics Technical Services at (301) 975-1007.

2.1FEATURES

¥Terminates T1/FT1 Circuits over a 4-Wire RJ-48C interface

¥10Base-T Ethernet bridge

¥PPP (Point to Point Protocol, RFC 1661) with Bridge Control Protocol (RFC 1638)

¥Unstructured Rates at 1.544 Mbps

¥D4 or ESF Framing Modes

¥Supports AMI or B8ZS/B7ZS Line Coding

¥Configuration via Software Control Port or Internal DIP Switches

¥Six Easy-to-Read LED Indicators Monitor Data & Diagnostics

¥Internal, External or Receive Recover Clocking

¥Also Operates as a High-Speed Point-to-Point Modem

¥Made in USA

2.2GENERAL PRODUCT DESCRIPTION

The NetLink-T1™Model 2720 Series are single port T1/FT1 CSU/DSUs that provide high-speed WAN connectivity. Plugging directly into the serial WAN port of a switch, router or multiplexer, the NetLink-T1ª pro- vides T1 or FT1 access at connection data rates of 1.544 Mbps, nx64, and nx56 (n=1 to 24 channels). The Netlink-T1ª is an excellent choice when terminating leased line services, Frame Relay backbones, internet access as well as LAN-to-LAN services.

The Netlink-T1ª provides digital access to a local WAN service provider or directly between two facilities over a dedicated 4-Wire circuit. WAN bandwidth, framing and coding options are programmed via externally accessible DIP switches or via a VT-100 type terminal using the rear- mounted EIA-232 Control Port. Netlink-T1ª supports D4/ESF framing options and AMI/B8ZS/B7ZS line coding. Netlink-T1ª also supports a full range of system and diagnostic features that make system setup easy.

The NetLink-T1ª provides T1 terminations over a modular RJ-48C jack and comply with jitter tolerance capabilities as specified in ANSI T1.403 and AT&T TR62411. External power options include 120VAC and universal interface 100-240VAC. 48VDC and rack card versions are also available.

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 connection; 3. A family of Network Control Protocols (NCPs) to establish and configure dif- ferent 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 param- eters of the linkÕs 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 net- work 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, configures and enables/disables the bridge protocol on both ends of the point-to-point link. BCP uses the same packet exchange mecha- nism 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 network layer protocol phase.

3.1APPLICATIONS

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 connection 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 net- work. 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 2720/I Series General Information, Features, General Product Description, PPP Operational Background
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2720/I Series specifications

The Patton Electronic 2720/I Series is a cutting-edge solution designed for businesses seeking reliable and high-performance network connectivity. This series provides a range of features tailored to meet the demands of modern telecommunications, making it ideal for both enterprises and service providers.

One of the standout features of the 2720/I Series is its ability to support multiple protocols, making it versatile for various networking environments. It supports both E1 and T1 interfaces, facilitating seamless integration with different types of communication lines. This adaptability ensures that users can maintain a consistent and efficient communication system, regardless of their existing infrastructure.

The 2720/I Series incorporates advanced technologies that enhance its performance and reliability. Notably, it features robust error detection and correction capabilities, which are essential for preserving data integrity during transmission. This is particularly important in business applications where data loss or corruption can have significant repercussions.

Security is another critical aspect of the 2720/I Series. With built-in encryption support, it ensures that sensitive data remains protected during transit. This makes the series suitable for organizations that handle confidential information and prioritize security in their communication channels.

The 2720/I Series also stands out with its user-friendly management interface. Administrators can easily configure and monitor the devices through a web-based interface, simplifying the management process and minimizing downtime. This intuitive design allows for quick adjustments and troubleshooting, which is vital for maintaining optimal network performance.

Power over Ethernet (PoE) capability is another significant feature of the 2720/I Series. This technology allows the device to receive power through the same cable used for data transmission, reducing clutter and simplifying installation. The ability to deliver power to remote devices enhances the deployment flexibility and efficiency.

In terms of physical characteristics, the 2720/I Series is designed for durability and reliability. It is housed in a rugged casing that can withstand various environmental conditions, making it suitable for deployment in challenging environments.

Overall, the Patton Electronic 2720/I Series combines versatility, reliability, and advanced technology, making it a valuable asset for any organization looking to enhance its communication infrastructure. Its robust features and user-friendly management capabilities make it a preferred choice for managing complex networking challenges effectively.
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