Chapter 4: Troubleshooting

2.Disconnect the Express XL/XLT. From a functioning voice phone, call the local directory number(s) provided with your line. Calling a good ISDN line with nothing connected usually results in a ring or fast busy tone. If someone answers, or you get a not-in-service intercept, there is probably something wrong with the translation of the line. The phone service pro- vider should be able to help.

3.If the Loop LED still remains off, then there is a physical problem with the phone line (more than likely, a problem with the Layer 1 setup). The prob- lem is in one or more of the places listed below:

•The Express XL/XLT software setup

•The Express XL/XLT hardware

•The wiring on your premises

•The telephone service provider’s wiring

•The telephone service provider’s hardware

•The telephone service provider’s software setup

To isolate the problem, perform the following procedure:

A.Ensure the line is plugged into the Express XL/XLT con- nector marked ISDN BRI U on the back of the Express XL/XLT.

B.Make sure the Express XL/XLT is configured for Dial line service.

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

D.Talk to your service provider and ensure you have an ISDN Basic Rate U-Interface with 2B1Q line coding. (Wrong options are an S or T interface or AMI line cod- ing).

E.Ensure that your phone line is connected to the actual telephone line (U-interface) provided by your telephone company. Make sure your line is not connected through another piece of equipment such as an NT1 in a wiring closet.

F.Make sure nothing else is bridged across the line pair.

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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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