Table of Contents
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Chapter 1. Introduction
Router
DDS Overview
Digital Data Service (DDS) is a nationwide service that allows
interconnection and transport of data at speeds up to 64 kbps. The
local exchange carriers provide the local loop service to DDS
customers and may provide data for routing Inter-LATA to an
interexchange carrier. In DDS mode, the DSU III AR supports all
DDS service rates yielding DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4 (sync
or async), 56 and 64 kbps (synchronous). An additional rate of 57.6
kbps is available in async mode. At the DDS service rates of 56 kbps
and 64 kbps, the unit can be configured to run slower DTE rates
(async or sync). Secondary channel operation is supported at all
service rates up to 56 kbps, providing terminal rates of 75, 150, 300,
600, 1200, and 2400 bps. The secondary rates available depend on
the DDS service rate configured.
4-Wire Switched 56 Overview
This switched, 4-wire Digital Data Service allows customers to pay
for data connection only for the time the unit is active. The regional
operating companies provide the 4-wire local loop service to SW56
customers. In SW56 mode the DSU III AR supports DTE rates of
2.4, 4.8, 9.6, 19.2, 38.4 (asynchronous or synchronous) and 56 kbps
(synchronous). An additional DTE rate of 57.6 kbps is available in
asynchronous modes.
1-2
DSU III AR
C
B
A
U
U
D B
D B
I I
I I
U I
U I
D S
D S
3
2
1
T E
T E
R
R
E N
E N
F
E
D
Network
6
5
4
9
8
7
T
T
T S
T S
M
M
A L
A L
C D
C D
D
D
R
R
T D
T D
C S
C S
R S
R S
F T S H I
F T
S H I
F T S H I
F T
S H I
#
0
*
N C
E L
N C
E L
C A
C A
56 kbps
Figure 1-1. Sample Point-to-Point Application for DSU III AR
DSU III AR User Manual
DSU III AR
DDS
DSU III DBU
DSU III DBU
A
B
C
1
2
3
ENTER
ENTER
D
E
F
4
5
6
7
8
9
R S
R S
C S
C S
T D
T D
R D C D A L M T S T
R D C D A L M T S T
SHIFT
SHIFT
SHIFT
SHIFT
CANCEL
CANCEL
*
0
#
56 kbps
Router
61202011L1-1
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Troubleshooting
