ADTRAN ATLAS 800PLUS user manual T1 Bandwidth Manager, Isdn Access Switch, WAN Overbooking

Chapter 1. Introduction

T1 Bandwidth Manager

As a T1 Bandwidth Manager, ATLAS 800PLUS combines the functions of a T1 CSU/DSU, an intelligent channel bank, a T1 Multiplexer, and DACS into a single platform. The Bandwidth Manager supports a wide range of data applications including T1 “drop and insert,” channel grooming, and wide area data transport. ATLAS is ideal for point-to-point configurations or access to public networks. For optimization of existing equipment and network resources, ATLAS can be paired with ADTRAN’s TSU product offerings to support a variety of data and analog voice applications (see Figure 1-4).

Figure 1-4. T1 Bandwidth Management

ISDN Access Switch

The ATLAS 800PLUS includes an advanced access architecture for switching dial- up calls to specific ports or DS0s. As an access switch functioning in a user-to-user network and user-to-user mode, ATLAS consolidates multiple basic rate ISDN (BRI) connections onto T1/PRI access lines. Additionally, BRI-to-BRI, BRI-to-PRI, and PRI-to-PRI switching are supported. ATLAS also converts between ISDN D channel (PRI or BRI) and T1 robbed bit signaling, allowing a non-ISDN PBX to access a more efficient ISDN facility. For network optimization, when bandwidth is not being used for switched applications such as video conferencing, switched connection mapping dynamically allocates bandwidth to the PB for voice traffic. Call Filtering allows you to program the call types that will be answered and/or originated on a per-user basis.

WAN Overbooking

The WAN Overbooking feature of ATLAS 800PLUS allows you to oversubscribe switched bandwidth for situations where simultaneous access to the network by every subscriber is not required. WAN Overbooking reduces telecommunications expenses while still giving your subscriber base the connectivity they require.

Local subscriber-to-subscriber connections are made without accessing the net- work at all, resulting in even more efficient use of wide area bandwidth (see Fig- ure 1-5 on page 1-6).

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