![]() The first access servers were the AS2509 and AS2511. ![]() The fact that the digital modems connecting into the PSTN through a PRI or Basic Rate Interface (BRI) can transmit data at over 53k using the V.90 communication standard, attests to the success of the idea. As a result, faster CPE modems have now been developed that take advantage of the clarity of signal that the digital modems enjoy. This is a modem that is capable of direct digital access to the PSTN. The answer to this need is a higher degree of interoperation with the telephone company equipment and the development of the digital modem. The carrier market has grown significantly, and the market now demands higher modem densities. The AS2511, on the other hand, is an example of a router that communicates with external modems. The AS3600, AS5200, AS5300, and AS5800 are all examples of routers that have the ability to run a Primary Rate Interface (PRI) along with banks of digital modems. It involves a customer premises equipment (CPE) device sending the telephone switch a phone number to which to direct a connection. Historyĭialup is simply the application of the public switched telephone network (PSTN) that carries data on behalf of the end user. If you are working in a live network, ensure that you understand the potential impact of any command before using it. All of the devices used in this document started with a cleared (default) configuration. The information presented in this document was created from devices in a specific lab environment. ![]() This document is not restricted to specific software and hardware versions. This document covers three main scenarios before you begin to troubleshoot, determine what type of call is being attempted and go to that section: The structure is designed to allow the reader to skip forward to the sections of interest, each of which are variations on the overall troubleshooting theme for a specific case. This document provides methods of troubleshooting different types of dial connections and is not intended to be read from start to finish.
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