ADTRAN has established a Year 2000 program to ensure that our products will
correctly function in the new millennium. ADTRAN warrants that all products
meet Y2K specifications regardless of model or revision.
Information about ADTRAN’s Y2K compliance program is available at the following locations:
ADTRAN Web Sitewww.adtran.com
Product Matrixwww.adtran.com/y2kfax.html
Faxback Document
Line
Y2K Project Line(256) 963-2200
E-mailyear2000@adtran.com
(256) 963-8200
Y2K plans and product certifications are
listed in the matrix.
iii
Federal Communications Comm ission Radio Frequency Interference
Statement:
This equipment has been tested and found to comply with the limits for a Class
B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed
to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio frequencies. Operation of this equipment in a residential area is likely to cause
harmful interference, in which case the user will be required to correct the interference at his own expense.
Shielded cables must be used with this unit to ensure compliance with Class B
FCC limits.
Changes or modifications to this unit not expressly approved by
the party responsible for compliance could void the user’s authority to operate the equipment.
Canadian Class B Products
The following information must be placed on the label and in the user’s manual
for all Class B products shipped into Canada.
This Class B digital apparatus meets all requirements of the Canadian Interference Equipment Regulations.
Cet appareil numerique dela class B respecte les exigences du Reglement sur le
Materiel Brouilleur du Canada.
iv
IMPORTANT SAFETY INSTRUCTIONS
When using your telephone equipment, please follow these
basic safety precautions to reduce the risk of fire, electrical
shock, or personal injury:
1Do not use this product near water, such as near a bath
tub, wash bowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool.
2Avoid using a telephone (other than a cordless-type) dur-
ing an electrical storm. There is a remote risk of shock
from lightning.
3Do not use the telephone to report a gas leak in the vicin-
ity of the leak.
4Use only the power cord, power supply, and/or batteries
indicated in the manual. Do not dispose of batteries in a
fire. They may explode. Check with local codes for special disposal instructions.
SAVE THESE INSTRUCTIONS
v
Internationa l C or d set Selecti o n
The following list is a selection of recommended cordset configurations to
ensure protective earthing continuity when utilizing this product internationally. This list gives the proper rating, cordage type, and plug/connector configuration for the specific country where the product is to be utilized.
CountryMimimum
Rating
Austria
Belgium
Czech Republic
Finland
France
Germany
Greece
Hungary
Iceland
Luxembourg
Netherlands
Norway
Poland
Portugal
Slovenia
Spain
Sweden
Yugoslavia
ADTRAN will replace or repair this product within five years from the date of
shipment if the product does not meet its published specifications or if it fails
while in service. For detailed warranty, repair, and return information, see the
ADTRAN Equipment Warranty and Repair and Return Policy Procedure.
Return Material Authorization (RMA) is required prior to returning equipment
to ADTRAN.
For Service, RMA requests, or more information, contact one of the numbers
found at the inside back page of this manual.
vii
viii
Table of Contents
List of Figures ............................................................................................................ xv
List of Tables ...........................................................................................................xvii
This section provides a functional description of the ESU LT,
describes its features, and illustrates its four interfaces.
Functional Description
The ADTRAN ESU LT is one of several E1 CSU/DSUs that
offer complete flexibility for connection of various data
sources to E1 or FE1 facilities. This family of ESU products
includes the following:
ESU LT -
•
port.
ESU 120e
•
a G.703 Drop port and a slot in the rear panel to house a
option module. Each module offers up to four additiona
data ports.
E1 CSU/DSUs with a single Nx56K/64K serial
- Same as the ESU LT with the added feature of
ESU LT
CANCEL
ENTER
PWR
TD
TEST
ALM
ERR
CS
RS
RD
Figure 1-1. ESU LT Unit - Front View
61200410L1-1ESU LT User Manual1-1
Chapter 1. Introduction
The ESU LT serves as the link between user data sources such
as local area network (LAN) bridges and routers, computers,
CAD systems, and teleconferencing equipment. The amount
of bandwidth allocated to the port is user-programmable.
The data terminal equipment (DTE) data can occupy
contiguous or alternate channels in the E1 stream, and the
channels may start at any position.
ESU LT Rear Panel
Number Identification for ESU LT Rear Panel
No.ItemFunction
1NetworkE1-FE1 network interface
2MON (Monitor)Bantam test jack
3Chain-InInterface of chain-in
4Chain-OutConnects to chain-in of another ESU LT
5Nx56/64DTE port
6Power SwitchUsed to turn power on or off
7Power Cord ConnectorIEC connector for power cord
1
NETWORK
MON
34
2
CONTROL
CHAIN IN CHAIN OUT
5
NX 56/64
6
90-240 VAC 50/60 HZ.24A
7
Figure 1 - 2. ESU LT Rear Panel
1-2ESU LT User Manual61200410L1-1
ESU LT Features
•An E1 interface and an Nx56/64 DTE serial interface port.
•Easy configuration capabilities using simplistic menus
displayed in a liquid crystal display (LCD) window operated by a front panel keypad.
•Data port supports V.35, EIA-530, V.36 and X.21 electrical
interfaces.
•Selectable timing from the network, the Nx56/64 DTE
port, or internally.
•All ones, all zeros, 511, QRSS, and 1:8 test patterns.
•Extensive self-testing and monitoring ensures proper operation.
•Flexible channel allocation (any starting channel and alternate or contiguous).
ESU LT Interfaces
The ESU LT is equipped with four interfaces:
•E1 Network interface per ITU G.703
•Nx56/64 high-speed, multiprotocol serial interface
•Control input (EIA-232)/Chain port input
•Chain port output
See Figure 1-3 and the following descriptions in this section.
Chapter 1. Introduction
ESU LT
ESU LT
Figure 1-3. ESU LT Int e rfaces
61200410L1-1ESU LT User Manual1-3
Network Interface (NI)
The Network Interface (NI) port provides the connection to
the E1. This port complies with the applicable ANSI and
CCITT standards. Either the 120Ω DB15 or the 75Ω BNC
interface (adapter provided) may be used for the Network
Interface. The 75/120 selection must be made with the front
panel menus. For more information, see Wiring on page C-1.
Network Test Interface
The MON test jack provides a bridges access jack for nonintrusive monitoring of the incoming E1.
Nx56/64 Serial Interface
The Nx56/64 provides a serial interface that operates from
56kbps to 2.048 Mbps. The Nx56/64 can be configured as a
V.35, V.36, EIA-530, or V.11 electrical interface through the
front panel menus.
Control Por t Input
The control port input provides an EIA 232 input from a PC
or a modem for control of the ESU LT. You can also use it as a
chain input from another ESU LT or ESU 120e. For more
information, see Wiring on page C-1.
Chapter 1. Introduction
Chain Port Output
The chain port output provides an EIA-232 output to chain
control to other ESU LTs or ESU 120es. For more information,
see Wiring on page C-1.
Software Management
Front Panel
The front panel provides complete and easy control of all
items that can be configured through menu-guided options.
The front panel LCD also displays the status of operation and
performance reports for the unit. A complete discussion of
the operation of the front panel is found in Chapter 3,
Operation on page 3-1. The menu options are found in
Chapters 4 through 7.
1-4ESU LT User Manual61200410L1-1
T- Watch Pro Management Software Program
T-Watch Pro is the ADTRAN management software program
that allows the user to control the ESU LT from a PC. It
provides complete control over the configuration of the ESU
LT using a graphic interface. The T-Watch Pro program
displays the same status and performance data as the front
panel LCD. This data is displayed as tables and graphs.
The T-Watch Pro program has the following capabilities:
•Interfaces with a modem which permits dialing into a remote ESU LT location to configure the unit or read the
unit’s status or performance.
•The performance data read from the units can be exported
in a file which is compatible with common spread sheet
programs.
ESU LT Testing
The ESU LT offers three forms of testing:
•Self-test
•Loopback tests
•Pattern generation and check
Chapter 1. Introduction
Self-test
The self-test checks the integrity of the internal operation of
the electronic components by performing memory tests and
by sending and verifying data test patterns through all
internal interfaces. Although actual user data cannot be
passed during these tests, the self-test can run with the
network and DTE interfaces in place, without disturbing any
external interface.
The self-test automatically executes upon power up. It can
also be commanded from a front panel menu or from the
control port.
In addition to the specified self-tests, background tests are
also run on various parts of the internal electronics. These
61200410L1-1ESU LT User Manual1-5
Loopback Tests
Chapter 1. Introduction
run during normal operation to confirm continued correct
functioning. The background tests include:
A number of different loopbacks can be invoked locally from
the front panel, by T-Watch commands, or remotely using
V.54 loopback code.
Network L o op ba cks
There are two types of network loopbacks. See Figure 1-4.
E1
Payload Loopback
Similar to line loopback, except that the framing is extracted
from the received data and then regenerated for the
transmitted data.
Line Loopback
Loops all of the received data back toward the network. The
transmitted data is the identical line code that was received,
including any bipolar violations or framing errors.
ESU
Figure 1-4. Network Loopback Tests
1-6ESU LT User Manual61200410L1-1
DTE Int erface Lo op back
The Nx56K/64K serial interface offers a DTE loopback. See
Figure 1-5.
DTE Loopback
Loops all data from the DTE back towards the DTE. This
loopback may be initiated by using the front panel or T-Watch
commands. The DTE (or the external test equipment) must
provide a test pattern to check the DTE interface.
Chapter 1. Introduction
ESU
Figure 1-5. DTE Interface Loopback
61200410L1-1ESU LT User Manual1-7
Pattern Generation
The ESU LT offers five test patterns: 511, QRSS, 1:8, All Ones,
and All Zeros.
Chapter 1. Introduction
511
QRSS
1:8
All Zeros
All Ones
The 511 pattern is generated and checked by the Nx56K/
64K serial interface. It only appears in the TS0s assigned to
the Nx56K/64K port.
When used in conjunction with the payload loopback at
the far end, an end-to-end integrity check can be made on
the DTE ports.
The ESU LT has an internal QRSS pattern generator and
detector. The pattern appears only in the TS0s assigned to
the Nx56K/64K port. The QRSS test pattern can be used in
conjunction with network loopbacks to perform end-toend tests.
The 1:8 is a stress pattern which places the maximum number of 0s in the transmitted data. This is always done over
all time slots.
This pattern is used in conjunction with external test equipment to determine if the E1 line is performing acceptably
under a stress condition. Each channel of the E1 has only
one bit set.
Generates an all zeros pattern in every channel.
Generates an all ones pattern in every channel.
1-8ESU LT User Manual61200410L1-1
Bridge/Router Ap plication
A bridge or router can be interfaced to the network by using
the DTE interface. The bandwidth used is programmable at
Nx56 or Nx64 data rates for E1 or FE1 service. The
bandwidth can be selected as contiguous or alternate. Figure
1-6 shows a simple bridge application.
Chapter 1. Introduction
Bridge Router
Nx56/64
High-speed
serial interface
ESU LT
E1
ESU LT
Nx56/64
High-speed
serial interface
Bridge Router
Figure 1-6. Simple Bridge Application on a E1 or FE1 Circuit
61200410L1-1ESU LT User Manual1-9
Chapter 1. Introduction
1-10ESU LT User Manual61200410L1-1
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