ADTRAN 1200270L1, Manual

Page: 21 / 132

61200270L1-20 DSU III ARdc User Manual 1-1
Chapter 1
Introduction
PRODUCT OVERVIEW
The ADTRAN DSU III ARdc provides a reliable, high-speed data connec-
tion for customer data terminal equipment (DTE) through digital data ser-
vice (DDS) lines or 4-wire Switched 56 (SW56) network lines. The DSU III
ARdc supports both synchronous and asynchronous data communication
over the DDS or 4-wire Switched 56 networks.
This unit is an all rate DSU/CSU, supporting services from 2.4 to 64 kbps
including 19.2 and 38.4 kbps services. The DSU III ARdc may be used in
either point-to-point or multi-point circuits.
The DSU III ARdc provides both V.35 and EIA-232 electrical and physical
DTE interfaces to accommodate a variety of applications. To insure a reli-
able connection, the unit features an extended receiver capability which
permits operation over long loops (3.4 miles or 5.5 km of 26 AWG at
56 kbps).
The unit supports Switched 56 (4-wire) service with dialing accomplished
from the front panel. This model is compatible with AT&T Accunet and
Sprint SW56 type services.
Figure 1-1 on page 1-2 shows a sample point-to-point application for the
DSU III ARdc.