ADTRAN 1202011L1, Руководство пользователя

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Chapter 1. Introduction
1-2 DSU III AR User Manual 61202011L1-1
Figure 1-1. Sample Point-to-Point Application for DSU III AR
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.
ENTER ENTER
1 2 3
4 5 6
7 8 9
# 0 * CANCEL CANCEL
SHIFT SHIFT SHIFT SHIFT
D
A
E
B
F
C
R S C S T D R D C D A L M T S T R S C S T D R D C D A L M T S T
DSU III DBU DSU III DBU
ENTER ENT ER
1 2 3
4 5 6
7 8 9
# 0 * CANCEL CAN CEL
SHIFT SHI FT SHIFT SHI FT
D
A
E
B
F
C
RS CS TD RD C D AL M T ST RS CS TD RD C D AL M T ST
DSU III DBU DSU III DB U
DDS
Network
Router DSU III AR DSU III AR
56 kbps 56 kbps
Router