Paradyne 3551 manual About Your DSU, Overview, Standard Features

About Your DSU 1

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Optional Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

V.32 DBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

2-PortTDM/Flex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Upgrades Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Equipment Warranty and Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Overview

The Model 3550 or 3551 data service unit (DSU) supports communication between computers and other data processing devices by providing connections to digital data service (DDS) transmission facilities. Both point-to-point and multipoint configurations are supported.

The following sections describe the standard features of the DSU, as well as the features of the options that may have been ordered with your unit. The technical specifications of the DSU and its orderable options are near the end of the chapter.

Standard Features

The Model 3550 or 3551 DSU offers the following features:

•Multispeed operation. The DSU operates at data rates of 2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps full-duplex over the digital data service (DDS) network.

Two DTE connectors (interfaces) are provided for Port 1: EIA-232-Dand V.35. Use the EIA-232-D connector for data rates up to and including

19.2 kbps; use the V.35 connector for higher rates.

•Rate Adaption. With this feature, the DSU can adapt its data rate to a low-speed application while operating over the high-speed DDS circuit.

•LADS operation. The DSU can operate as a local area data set (LADS) (sometimes called a limited-distance modem, or LDM) at 2.4, 4.8, 9.6, 19.2, 38.4, 56, or 64 kbps.

•Single-Port Async/Sync. The single-portasynchronous-to-synchronous feature makes it possible to send asynchronous data over the synchronous network.

•Nondisruptive Diagnostics. When set up to use nondisruptive diagnostics, the DSU sends diagnostic data without interrupting or disrupting customer data.

•NMS control. The DSU can be controlled by COMSPHEREr 6700 Series NMS. The 6700 Series NMS operates using Advanced Diagnostic protocol (ADp).

The Model 3550 DSU requires a hubbing device for connection to the NMS; the Model 3551 DSU is connected to the NMS through the shared diagnostic unit (SDU) in the COMSPHERE

3000 Series Carrier.

3550-A2-GB20-20 December 1996 1-1