Chapter 1: Understanding ISDN and the Express XL/XLT

Ordering ISDN

When ordering ISDN from the telephone company, request EZ-ISDN 1 (Ca- pability Package U) to ensure it is set up properly. EZ-ISDN 1 is recommend- ed by the industry for most home office/small business applications. If this is not available from your service provider or you would like more information regarding ordering ISDN, see the ADTRAN document Ordering ISDN Service User Guide part number 60000.015-8 or contact your telephone company for al- ternative line configurations. The Ordering ISDN Service User Guide is avail- able on the ADTRAN home page at http://www.adtran.com or by calling

ADTRAN.

Interoperability

The Express XL/XLT is standards based and uses PPP developed by Internet Engineering Task Force (IETF). PPP provides a standard method of transport- ing multi-protocol datagrams over point-to-point links. PPP is widely accept- ed by many ISDN bridge/router manufacturers. The Express XL/XLT will negotiate Multilink PPP when connecting both B-channels. The Bandwidth Allocation Protocol (BAP) may also negotiate, which enhances the manage- ment of adding and removing a B-channel. Data compression is also support- ed using LZS® technology from hi/fn™.

Connecting to the Internet

Internet Service Providers (ISPs) assign an IP address to use when connected to their service using PPP negotiation. This assignment is based on the as- sumption that the user has an ISDN terminal adapter running PPP async-to- sync conversion or another rate adaption where the PPP negotiation is termi- nated inside the PCs IP stack. However, if an ISDN-ethernet gateway device is used, the ISP must preassign the customer a subnet which uses multiple IP addresses. This may result in a much higher cost to the user.

The Express XL/XLT permits the user to assign any IP addresses to the unit and computers. Operations on the network can occur normally. In fact, one B- channel can connect to the ISP using NAT while the other B-channel connects to another “private” or “fake” network. All packets transmitted or received over the ISP connection are translated. The Express XL/XLT keeps track of the computers that request services over the Internet. A web server address can

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ADTRAN Express XLT user manual Ordering Isdn, Interoperability, Connecting to the Internet
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Express XLT, Express XL specifications

ADTRAN has established itself as a leading provider of telecommunications solutions, and among its impressive lineup, the ADTRAN Express XL and Express XLT stand out as robust offerings designed for the evolving demands of modern networks. These devices cater to service providers and enterprises looking to enhance their broadband delivery capabilities while ensuring cost-efficiency and reliability.

The ADTRAN Express XL is a high-capacity, next-generation fiber optic access platform. It is engineered to support a wide array of technologies, including Passive Optical Network (PON) standards such as GPON and XGSPON. The Express XL's architecture allows for seamless scalability, making it a perfect fit for both small-scale deployments and expansive network rollouts. What sets it apart is its ability to deliver ultra-fast broadband services to residential, business, and mobile backhaul customers with its impressive throughput capabilities.

On the other hand, the Express XLT builds upon the success of the Express XL by incorporating advanced features aimed at maximizing operational efficiency. It supports technologies including Active Ethernet and offers flexible network configurations to meet specific service requirements. Both models utilize ADTRAN’s innovative Dynamic Bandwidth Allocation technology, which dynamically allocates bandwidth to users based on real-time demand, ensuring optimal performance and user satisfaction.

A key characteristic of both ADTRAN Express XL and XLT is their energy efficiency. Designed to minimize operational costs, these units use power-saving technologies that reduce energy consumption without compromising performance. Furthermore, they include built-in support for network functions virtualization (NFV) and software-defined networking (SDN), providing operators with the agility to adapt their networks in response to changing market conditions.

In addition to their advanced technological underpinnings, the Express XL and XLT boast an intuitive management interface, simplifying network monitoring and management tasks. They also feature comprehensive telemetry and analytics capabilities that help operators gain insights into network performance, optimize configurations, and troubleshoot potential issues before they affect end users.

Ultimately, the ADTRAN Express XL and Express XLT are pivotal components for service providers aiming to deliver high-speed broadband services effectively. With their blend of flexibility, scalability, and energy efficiency, these access platforms are well-positioned to meet the current and future demands of telecommunications networks worldwide.
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