Chapter 1 Introduction

T1/FT1 OVERVIEW

T1 digital communication links have been used by telcos for the transmission of voice since the early sixties. The D4 channel bank is an example of a T1 digital carrier system that was introduced in the mid- seventies and is still widely used by the telcos. Communication demands of business continued to grow to the point that the telcos began offering T1 service directly to the public. D4 channel banks were used for T1 in corporate network topographies for voice. The technological advances in computer development also created a demand for T1 data communication, which now is a large part of the T1 traffic.

T1 SERVICE OFFERINGS

T1 is a digital service delivered to the user over two pairs of wires from the service provider. The signal operates at 1.544 Mbps and is usually extended by repeaters installed approximately every mile after the first 6000 feet. The T1 signal is divided into 24 time slots which operate at 64 kbps (DS0s). Each time slot is occupied by digitized voice or by data.

The T1 signal originally used a type of framing known as D4 superframe (SF), which identifies how the T1 is multiplexed. An enhancement of that framing format, called extended superframe (ESF), is available. ESF provides a non-disruptive means of full-time monitoring on the digital facility. It was originally used by service providers to monitor the performance of their service offering. Since the introduction of ESF, equipment installed in private networks can also provide this performance information to the user.

T1 ESF CSU ACE OVERVIEW

Most carriers (regional or local telcos), when supplying a T1 line to customer premises equipment (CPE), require an interface to monitor the T1 line. The T1 ESF CSU ACE (extended superframe channel service unit advanced communication equipment) provides the required interface between the CPE (such as DSUs, channel banks, T1 multiplexers, and PBXs) and telco or private T1 facilities. Figure 1-1depicts a typical application.

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© 2004 ADTRAN, Inc

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ADTRAN user manual T1/FT1 Overview, T1 Service Offerings, T1 ESF CSU ACE Overview
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T1 ESF CSU ACE specifications

The ADTRAN T1 ESF CSU ACE is a robust and essential device designed for the efficient transmission of data over T1 lines. As a Channel Service Unit (CSU) and Digital Service Unit (DSU) in one, it meets the needs of service providers and businesses that require reliable communication. This powerful device offers a seamless connection between customer premises equipment (CPE) and the public switched telephone network (PSTN).

One of the main features of the ADTRAN T1 ESF CSU ACE is its support for both T1 and E1 line formats, making it versatile for different telecommunications environments. The unit comes with advanced error correction capabilities, which significantly minimize errors during data transmission, ensuring high-quality service. The application of Extended Superframe Format (ESF) further enhances the error detection capability, thus providing greater reliability and service availability.

The CSUs in the ADTRAN T1 ESF CSU ACE are designed with integrated diagnostics that allow users to monitor real-time network performance. Features such as loopback testing and local/remote diagnostics help technicians quickly identify and troubleshoot issues, which saves time and reduces disruptions. The built-in LED indicators give immediate status updates on power, alarms, and line integrity, allowing for ease of use and management.

In terms of scalability, this CSU can accommodate growing business needs with its flexible configuration options. Users can manage and configure the device through an intuitive command line interface (CLI), making it accessible for network administrators of all levels. Furthermore, the unit typically supports full duplex operations, enabling simultaneous transmission and reception of data, which optimizes network efficiency.

The ADTRAN T1 ESF CSU ACE also adheres to industry standards, ensuring compliance with various network requirements. It includes surge protection and ensures a robust design that is suitable for deployment in diverse environments, from small offices to larger enterprise networks.

In conclusion, the ADTRAN T1 ESF CSU ACE stands out as a reliable, feature-rich solution for businesses requiring T1 connectivity. With its combination of high performance, robust diagnostics, and comprehensive error correction, this device is an essential component for ensuring efficient and uninterrupted communication in today's digital landscape.
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