Chapter 4: Troubleshooting

G.With a minimum of extra wiring, try connecting to the line pair at the point where the service provider’s wiring ends.

H.With the Express XL/XLT connected to the line and pow- ered up, talk to your service provider’s repair group and inform them that your ISDN basic rate line has a physical Layer 1 problem. Ask them to check the line. Tell them that you have an NT1-like device at the end of the line.

4.If the Loop Status in the Express XL/XLT Status menu continuously reads Getting TEI #1, then the Express XL/XLT is physically connected to your local telephone service provider but is unable to establish logical layer 2. The problem is in one or more of the places listed below:

•The Express XL/XLT software setup

•The telephone service provider’s software setup

•Hardware configuration, if the line is extended from the switch

To isolate the problem, perform the following procedure:

A.Ensure the Express XL/XLT is setup for the correct switch type.

B.Ensure the quality of your line is satisfactory by checking for near and far end block errors (NEBEs and FEBEs). If the counts are non-zero, there may be a physical link problem as described in step 3.

C.If possible, try another piece of functioning ISDN equip- ment with a U-interface on the line.

D.With the Express XL/XLT connected to the line and pow- ered up, talk to your service provider’s repair group and tell them you have an ISDN basic rate line that appears physically okay but has no terminal endpoint identifier (TEI). Ask them to check the line translation and ensure that the line supports dynamic TEI allocation. Tell them that you have an NT1 and terminal adapter device con- nected to the line.

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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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