Chapter 1: Understanding ISDN and the Express XL/XLT

Bridging

In Bridge Mode, the Express XL/XLT can communicate with two remote net- works at a time. The destination is dialed by setting up a Connection List pro- file and choosing Dial on the Dial menu. See Configuration/Connection List on page 63 for instructions on setting up a Connection List profile.

During a two B-channel PPP Multilink call, the Express XLT automatically drops one B-channel and provides it to the POTS port when a telephone call is placed or answered. When a POTS telephone call terminates, the Express XL redials the second B-channel and supplies the bandwidth back to the LAN connection. Since other bandwidth management features are disabled in the factory default configuration, the dialed links remain active until the Hang-upcommand is entered from the Dial menu, terminating the session with the se- lected remote network.

The Connection List described in the next section may be used to automate di- aling and to store additional information specific to the remote site being di- aled (phone numbers, number of B-channels to dial, authentication information, Caller ID, etc.). In addition, Demand Dialing may be enabled to allow idle links to disconnect when not being used to reduce line charges.

Simple Demand Bridging may be configured by enabling the Idle Time-Out parameter under the Configuration/ Connection List [1]/Bandwidth/On De- mand option on the Connection List. Setting this parameter to a non-zero val- ue allows a bridge connection to disconnect after the specified number of seconds with no traffic crossing the ISDN link. Bandwidth can be controlled using the Express XL/XLT’s advanced filtering capability. When new traffic needs to be transmitted, the Express XL/XLT will run each packet through its Demand filters defined for each Connection List profile. If a packet can pass through the filter, then the numbers for that profile are dialed. In addition, when both B-channels are selected for use, the link may be configured to add/ remove the second B-channel based on the amount of traffic crossing the link. The bridged connection is terminated when the Hang-upoption is selected from the Dial menu, but will redial if the demand filter condition is met.

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Express XL/XLT User Manual

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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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