About Your Dsu; Overview; Standard Features - Paradyne COMSPHERE 3550 Series User Manual

Overview

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Standard Features

Optional Features
V.32 DBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-Port
TDM/Flex
Upgrades Available
Technical Specifications
Equipment Warranty and Support
Overview
The COMSPHERE 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-D and 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.
3550-A2-GB20-40
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About Your DSU

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-port
asynchronous-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
COMSPHERE 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.
July 1999
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