Chapter 1. Introduction
1-2
DSU IV ESP User Manual
61204011L1-1
The DSU IV ESP provides both V.35 and EIA-232 electrical and
physical DTE interfaces to accommodate a variety of applications.
To ensure a reliable 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 ESP 4-wire SW56 DBU card and the base unit's integrated
SW56 capabilities are compatible with AT&T Accunet and Sprint
SW56 type services. The V.34 DBU card allows switched backup
over the public switched telephone network (PSTN). The ESP ISDN
1B+D card is compatible with National ISDN and supports a U-
interface to the Basic Rate ISDN.
Figure 1-1 shows a typical point-to-point application for the DSU
IV ESP.
Figure 1-1. Typical Point-to-Point Application for DSU IV ESP
4-wire
SW56
4-wire
SW56
V.34
V.34
DEDICATED
PRIVATE NETWORK
PUBLIC SWITCHED
DIGITAL NETWORK
PUBLIC SWITCHED
TELEPHONE NETWORK
ISDN
NETWORK
C
1
16
2
3
4
5
6
7
8
9
10
11
12
13
14
15
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ERROR
ALM
SELECT
TEST
DSU III AR
DSU III AR
DSU III AR
DSU III AR
DSU III S4W
DSU III S4W
DSU III S4W
DSU III DBU
DSU III S4W
DSU III DBU
DSU III DBU
DSU III DBU
DSU S2W
DSU S2W
DSU S2W
POWER SUPPLY
POWER SUPPLY
DIAL
DIAL
STATUS
TEST
CONFIG
ENTER
1
2
3
4
5
6
7
8
9
0
DIALMATE
CANCEL
SHELF
CONTROLLER
CONTROLLER
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
RDL
PTRN
ERROR
ALM
SELECT
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ERROR
ALM
SELECT
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
+5V
+12V
-12V
-5V
CHECK
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
RS
CS
TD
RD
CD
DTE
LOOP
RDL
PTRN
ERROR
ALM
SELECT
TEST
+5V
+12V
-12V
-5V
CHECK
S
ERVER
PCs
P
RINTER
B
RIDGE
/R
OUTER
L
ocal
A
rea
N
etwork
L
ocal
A
rea
N
etwork
S
MART
16 S
HELF
DSU IV ESP
S
ERVER
PCs
P
RINTER
B
RIDGE
/R
OUTER
SHIFT
*
7
D
4
A
1
8
0
E
5
B
2
QUICK
DSU IV ESP
#
9
F
6
C
3
ENTER
CANCEL
Summary of Contents for DSU IV ESP
Page 54: ...Chapter 4 Applications 4 8 DSU IV ESP User Manual 61204011L1 1...
Page 80: ...Chapter 8 Configuring Test Options 8 4 DSU IV ESP User Manual 61204011L1 1...
Page 92: ...Chapter 9 Configuring Dial Options 9 12 DSU IV ESP User Manual 61204011L1 1...
Page 104: ...Chapter 11 Configuring Unit Utilities 11 6 DSU IV ESP User Manual 61204011L1 1...
Page 108: ...Chapter 12 Activating Dial Functions 12 4 DSU IV User Manual 61204011L1 1...
Page 134: ...Chapter 14 Viewing Status Information 14 6 DSU IV ESP User Manual 61204011L1 1...
Page 140: ...Appendix A Pinouts A 6 DSU IV ESP User Manual 61204011L1 1...
Page 152: ...Appendix B AT Commands B 12 DSU IV ESP User Manual 61204011L1 1...
Page 168: ...Appendix D Configuration Profiles D 4 DSU IV ESP User Manual 61204011L1 1...
Page 172: ...Appendix E DSU to DSU Tail Circuit E 4 DSU IV ESP User Manual 61204011L1 1...
Page 176: ...Appendix F Specifications Summary F 4 DSU IV ESP User Manual 61204011L1 1...
Page 190: ...Appendix H Glossary H 10 DSU IV ESP User Manual 61204011L1 1...
Page 194: ...Index Index 4 DSU IV ESP User Manual 61204011L1 1...
