Black Box MT136A User manual

CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
JULY 1998
MT136A
MT137C
MT138C
MT139C
MT140C
CSU/DSU MS DBU
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CSU/DSU MS DBU
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TRADEMARKS
TRADEMARKS USED IN THIS MANUAL
Accunet and AT&T are registered trademarks of American Telephone and
Telegraph Company.
VT100 is a trademark of Digital Equipment Corporation.
HP and OpenView are registered trademarks of Hewlett-Packard.
IBM and NetView are registered trademarks of International Business Machines
Coporation.
MCI is a registered trademark of MCI Telecommunications Corporation.
MNP is a registered trademark of Microcom Systems, Inc.
Siemens is a registered trademark of Siemens Aktiengesellschaft.
UL is a registered trademark of Underwriters Laboratories Incorporated.
Sprint and US Sprint are registered trademarks of U.S. Sprint Communications
Co. Ltd.
Any other trademarks mentioned in this manual are acknowledged to be the
property of the trademark owners.

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CSU/DSU MS DBU
FEDERAL COMMUNICATIONS COMMISSION
AND
INDUSTRY CANADA
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy and if not
installed and used properly, that is, in strict accordance with the manufacturer’s
instructions, may cause interference to radio communication. It has been tested
and found to comply with the limits for a Class A computing device in accordance
with the specifications in Subpart J of Part 15 of FCC rules, which are designed to
provide reasonable protection against such interference when the equipment is
operated in a commercial environment. Operation of this equipment in a
residential area is likely to cause interference, in which case the user at his own
expense will be required to take whatever measures may be necessary to correct
the interference.
Changes or modifications not expressly approved by the party responsible
for compliance could void the user’s authority to operate the equipment.
This digital apparatus does not exceed the Class A limits for radio noise emission from
digital apparatus set out in the Radio Interference Regulation of Industry Canada.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites
applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par Industrie Canada.

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NOM STATEMENT
NORMAS OFICIALES MEXICANAS (NOM)
ELECTRICAL SAFETY STATEMENT
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de
que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo, cerca
de la tina de baño, lavabo, sótano mojado o cerca de una alberca, etc..
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales que
sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como sea
recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá
a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser
referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá,
alfombra o superficie similar puede bloquea la ventilación, no se debe colocar
en libreros o gabinetes que impidan el flujo de aire por los orificios de
ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor
como radiadores, registros de calor, estufas u otros aparatos (incluyendo
amplificadores) que producen calor.
11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del
tipo descrito en el instructivo de operación, o como se indique en el aparato.

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CSU/DSU MS DBU
12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización
del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen del
aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las lineas
de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no sea
usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato; o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.

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ABOUT THIS MANUAL
About This Manual
This manual is arranged so you can quickly and easily find the information
you need. The following is an overview of the contents of this manual:
• Chapter 1, Introduction, familiarizes you with DDS, Switched 56, SNMP,
and TELNET. This chapter also includes CSU/DSU MS DBU highlights
and describes the options that may be purchased for use with the DSU.
• Chapter 2, Installation, describes the DSU connectors (pin assignments
are given in Appendix A) and provides an installation diagram.
• Chapter 3, Operation, explains how to operate your DSU using either
the front panel or a VT100™ terminal interface.
• Chapter 4, Applications, provides examples of some common DSU
applications, including network diagrams.
• Chapter 5, Configuration Overview, explains how to access the DSU
configuration menu, including information on the different configuration
methods. This chapter also provides a front-panel menu tree.
• Chapters 6 through 11 provide brief explanations for selections made in the
Configuration menus. These chapters are based on the front-panel menu
branches of the Configuration menu: Network Options, DTE Options,
Test Options, Dial Options, Management, and Utilities.
• Chapter 12, Testing and Troubleshooting, describes the testing options
available with the CSU/DSU MS DBU and gives troubleshooting information.
• Chapter 13, Activating Dial Functions, describes the Dial options available
from the Main menu.
• Chapter 14, Viewing Status Information, provides information on the status
menus available for the base unit as well as the DBU cards.
• Appendix A provides pinouts for the connectors of the DSU and the DBU
and Ethernet cards.
• Appendix B shows the AT commands available for the DSU.
• Appendix C describes the terminal menu interface (accessed through
a VT100 terminal or a TELNET session).
• Appendix D provides information on the unit’s configuration profiles.

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CSU/DSU MS DBU
• Appendix E contains a DSU-to-modem interconnect diagram for a modem tail-
circuit application.
• Appendix F contains product specifications.

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FCC REGULATIONS
FCC regulations require that the following information be provided in this
manual:
1. This equipment complies with Part 68 of the FCC rules. On the bottom of
the equipment housing is a label that shows the FCC registration number
and ringer equivalence number (REN) for this equipment. If requested,
provide this information to the telephone company.
2. If this equipment causes harm to the telephone network, the telephone
company may temporarily discontinue service. If possible, advance notification
is given; otherwise, notification is given as soon as possible. The telephone
company will advise the customer of the right to file a complaint with the FCC.
3. The telephone company may make changes in its facilities, equipment,
operations, or procedures that could affect the proper operation of this
equipment; advance notification and the opportunity to maintain
uninterrupted service are given.
4. If experiencing difficulty with this equipment, please contact Black Box
for repair and warranty information. The telephone company may require
this equipment to be disconnected from the network until the problem is
corrected, or it is certain the equipment is not malfunctioning.
5. This unit contains no user-serviceable parts.
6. An FCC-compliant telephone cord with a modular plug is provided with this
equipment. In addition, an FCC-compliant cable appropriate for the dial-
backup option ordered is provided with this equipment. This equipment
is designed to be connected to the telephone network or premises wiring
using an FCC-compatible modular jack that is Part 68 compliant.
7. The following information may be required when applying to the local
telephone company for leased-line facilities:
Digital Facility Service Order
Service Type Interface Code Code Network Jacks
2.4 kbps Digital Interface 04DU5-24 6.0F RJ-48S
4.8 kbps Digital Interface 04DU5-48 6.0F RJ-48S
9.6 kbps Digital Interface 04DU5-96 6.0F RJ-48S
19.2 kbps Digital Interface 04DU5-19 6.0F RJ-48S
38.4 kbps Digital Interface 04DU5-38 6.0F RJ-48S
56 kbps Digital Interface 04DU5-56 6.0F RJ-48S
64 kbps Digital Interface 04DU5-64 6.0F RJ-48S

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CSU/DSU MS DBU
8. The following information may be required when applying to the local
telephone company for a dial-up line for the V.34 Module:
Service Type SOC REN FIC USOC
Loop Start (V.34) 9.0Y 0.8B 02LS2 RJ-11C
9. The following information may be required when applying to the local
telephone company for Switched 56 service for the S4W DBU Card:
Service Type SOC REN FIC USOC
PSDS 6.0F N/A 04D45-56B RJ-48S
10. The following information may be required when applying to the local
telephone company for ISDN service for the ISDN Module:
Service Type SOC REN FIC USOC
Basic Rate ISDN 6.0F N/A 021S5 RJ-49
11. The REN is useful in determining the quantity of devices you may connect to
your telephone line and still have all of those devices ring when your number
is called. In most areas, the sum of the RENs of all devices should not exceed
five. To be certain of the number of devices you may connect to your line as
determined by the REN, call your telephone company to determine the
maximum REN for your calling area.
12. This equipment may not be used on coin service provided by the telephone
company. Connection to party lines is subject to state tariffs. (Contact your
state public utility commission or corporation commission for information.)

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ISDN SERVICE ORDERING INFORMATION
ISDN Service Ordering Information for the CSU/DSU MS DBU With ISDN Dial
Backup
For CSU/DSU MS DBU ISDN applications, the following guide can be used
as an aid in ordering basic ISDN service from your local telephone company.
The CSU/DSU MS DBU ISDN includes NT1 and terminal-adapter functionality
and supports data rates up to 64 kbps.
R EQUEST AN ISDN B ASIC R ATE I NTERFACE (BRI) LINE WITH THE FOLLOWING FEATURES :
U-interface reference point
2B1Q line coding
1B+D Service (supports up to 64 kbps)
T HE CSU/DSU MS DBU ISDN SUPPORTS THE FOLLOWING SWITCH TYPES AND SOFTWARE
PROTOCOLS
:
AT&T®5ESS Custom, 5E6 and later software, National ISDN-1
NT1 DMS-100 BCS-32 and later software (Pvc1), National ISDN-1 (Pvc2)
Siemens®EWSD National ISDN-1
Request that the ISDN line allocate one DYNAMIC Terminal Endpoint Identifier
(TEI) for the number.
For service offered from an AT&T 5ESS, request a point-to-point line with the
following features:
Feature: Value
B1 Service: On Demand (DMD)
Data Line Class: Point-to-Point
Maximum B Channels: 1 (1B+D)
Circuit Switched Data (CSD) Bearer Channels: Any
Number of CSD Calls: 1 (1B+D)
Terminal Type: Type A

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CSU/DSU MS DBU
T URN THE FOLLOWING FEATURES OFF :
Packet Mode Data
Multi-line Hunt
Multiple Call Appearances
Electronic Key Telephone Sets (EKTS)
Shared Dictionary Numbers
Accept Special Type of Number
Intercom Groups
Network Resource Selector (Modem Pools)
Message Waiting
Hunting
InterLata Competition
F OR SERVICE OFFERED FROM A N ORTHERN T ELECOM DMS-100, REQUEST A P OINT - TO -P OINT
M ULTI -P OINT LINE WITH THE FOLLOWING FEATURES :
Line Type: Basic Rate, Functional
Electronic Key Telephone Sets (EKTS): No
Call Appearance Handling (CACH): No
Non-Initializing Terminal: No
Circuit Switched Service: Yes
Packet Switched Service: No
TEI: Dynamic
Bearer Service: Circuit Switched voice and data permitted on any B channel (packet mode
data not permitted)

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CONTENTS
Contents
Chapter Page
1. Introduction........................................................................................................15
1.1 Overview ....................................................................................................15
1.2 DDS Operation ........................................................................................16
1.3 Switched 56 Operation ............................................................................16
1.4 SNMP ........................................................................................................16
1.5 TELNET ....................................................................................................17
1.6 Dial-Backup Operation ............................................................................17
1.7 Dial Backup Modes ..................................................................................17
2. Installation ..........................................................................................................19
2.1 Unpack, Inspect, and Power Up ..............................................................19
2.2 Rear Panel ................................................................................................20
3. Operation............................................................................................................24
4. Applications ........................................................................................................30
4.1 LAN Application with SNMP/TELNET Management ..........................30
4.2 Dial-Backup Application ..........................................................................33
5. Configuration Overview ....................................................................................36
6. Configuring Network Options ..........................................................................42
6.1 Loop Rate ..................................................................................................43
6.2 Network Address ......................................................................................43
6.3 Remote Configuration..............................................................................44
6.4 Network Type ............................................................................................44
6.5 Clock Source ............................................................................................44
7. Configuring DTE Options ................................................................................45
7.1 DTE Rate ..................................................................................................48
7.2 Connector Type ........................................................................................48
7.3 Data Format ..............................................................................................48
7.4 DTE Command Option............................................................................49

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CSU/DSU MS DBU
Chapter Page
7.5 Transmit Clock..........................................................................................49
7.6 Clear to Send (CS) Options ....................................................................49
7.7 Anti-Stream................................................................................................50
7.8 CD Options................................................................................................50
7.9 Data Terminal Ready (TR) Options........................................................50
7.10 Data Set Ready (SR) Options ..................................................................50
8. Configuring Test Options ..................................................................................51
9. Configuring Dial Options ..................................................................................54
9.1 Phone Numbers ........................................................................................55
9.2 SW56 Auto Answer....................................................................................55
9.3 DBU Options ............................................................................................56
9.3.1 Standard DBU Options ..................................................................56
9.3.2 DBU Options for S4W ....................................................................59
9.3.3 DBU Options for V.34 Card ............................................................60
9.3.4 DBU Options for ISDN Card ..........................................................61
9.3.5 DBU Passcode ..................................................................................61
10.Configuring Management Functions................................................................63
10.1 Interface ....................................................................................................63
10.2 Control Rate ..............................................................................................63
10.3 IP Options..................................................................................................64
10.3.1 Unit IP Address ................................................................................64
10.3.2 Subnet Mask ....................................................................................64
10.3.3 Gateway IP Address..........................................................................64
10.3.4 IP Security ........................................................................................64
10.3.5 IP Filter Address ..............................................................................64
10.4 SNMP Options ..........................................................................................65
10.5 TELNET Options......................................................................................66
10.6 Entering Letters Using the Front Panel..................................................66

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CONTENTS
Chapter Page
11.Configuring Unit Utilities ..................................................................................68
11.1 Manual Command ....................................................................................69
11.2 Time/Date ................................................................................................70
11.3 Software Revision ......................................................................................71
11.4 LAN MAC Address....................................................................................71
11.5 Serial Number ..........................................................................................71
12.Testing and Troubleshooting ............................................................................72
12.1 Test Overview ............................................................................................72
12.1.1 Initiating a Test ................................................................................72
12.1.2 Test Status Display............................................................................73
12.1.3 Exiting a Test....................................................................................74
12.2 Troubleshooting ......................................................................................74
12.2.1 Messages from the DSU/CSU ........................................................74
12.2.2 Troubleshooting New Installations ................................................76
12.3 Local Unit Diagnostics..............................................................................77
12.3.1 DTE & Loop (LL)............................................................................78
12.3.2 Loop Only (RT) ..............................................................................79
12.3.3 DTE Only..........................................................................................79
12.3.4 DTE With Test Pattern ....................................................................80
12.3.5 Test Pattern ......................................................................................81
12.3.6 Self-Test ............................................................................................82
12.4 Remote Unit Diagnostics..........................................................................82
12.5 DBU Connection ......................................................................................84
13.Activating Dial Functions ..................................................................................86
14.Viewing Status Information ..............................................................................88
Appendix A. Pinouts ..............................................................................................92
Appendix B. AT Commands ..................................................................................96

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CSU/DSU MS DBU
Chapter Page
Appendix C. Terminal Menu Structure ................................................................98
C.1 Status Messages ......................................................................................102
C.2 Local/Remote Configuration Menus....................................................102
C.2.1 DSU Configuration (DTE, Network, and Test Options)............103
C.2.2 DBU Configuration ......................................................................103
C.2.3 Management Configuration..........................................................104
C.2.4 Utility Configuration......................................................................105
C.3 Local/Remote Test Menus ....................................................................106
C.4 Dial SW56/Dial DBU..............................................................................106
C.4.1 Dial SW56 Options ........................................................................106
C.4.2 Dial DBU ........................................................................................107
Appendix D. Configuration Profiles....................................................................108
Appendix E. DSU-to-Modem Interconnect ........................................................111
Appendix F. Specifications ..................................................................................112

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CHAPTER 1: Introduction
1. Introduction
1.1 Overview
The CSU/DSU MS DBU (data service unit with embedded SNMP) provides
a reliable, high-speed data connection for customer data terminal equipment
through digital data service (DDS) lines. The CSU/DSU MS DBU has an
embedded SNMP agent that provides complete SNMP access to the unit through
an integral SLIP or PPP async port. The CSU/DSU MS DBU’s unique modular
approach provides optional 10BASE-T Ethernet access for SNMP. Also, optional
modular DBU cards provide automatic or manual dial backup for the dedicated
circuit.
The following are features of the CSU/DSU MS DBU:
• DDS rates supported from 2.4 to 64 kbps, including 19.2 and 38.4
• 4-wire Switched 56 (SW56) operation
• Embedded SNMP and TELNET
• Control port provides SLIP and async PPP access to SNMP or VT100 terminal
configuration
• Two option slots
• 10BASE-T Ethernet SNMP port available with the SNMP Ethernet Module
• Automatic or manual DBU
• DBU available with DBU cards; options include 4-wire Switched 56, V.34,
and ISDN
• Time-of-day and weekend lockout options
The CSU/DSU MS DBU 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 4-wire Switched 56 Module and the base unit’s integrated SW56 capabilities
are compatible with AT&T Accunet®and Sprint®SW56 type services. The V.34

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CSU/DSU MS DBU
Modem Module allows switched backup over the public switched telephone
network (PSTN). The ISDN Module is compatible with National ISDN and
supports a U-interface to the Basic Rate ISDN.
1.2 DDS Operation
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 CSU/DSU MS DBU supports 2.4-kbps to 64-kbps DDS
service rates yielding DTE rates of 2.4, 4.8, 9.6, 19.2, 38.4 (sync or async), 56 kbps,
and 64 kbps. An additional rate of 57.6 is available in asynchronous mode. The
unit can be configured to run slower DTE rates (async or sync) over the 56 or 64
kbps service.
1.3 Switched 56 Operation
Dial-up, 4-wire Switched 56 DDS 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. The CSU/DSU MS DBU supports DTE rates
of 2.4, 4.8, 9.6, 19.2, 38.4, and 56 kbps (synchronous) and 2.4, 4.8, 9.6, 19.2, 38.4,
and 57.6 kbps (asynchronous).
1.4 SNMP
The term SNMP (Simple Network-Management Protocol) broadly refers to the
message protocols used to exchange information between the network and the
managed devices, as well as to the structure of network-management databases.
SNMP has three basic components:
N ETWORK M ANAGER
Control program that collects, controls, and presents data pertinent to the
operation of the network devices. It resides on a network-management station.
A GENT
Control program that resides in each network device connected. This program
responds to queries and commands from the network manager and returns
requested information or invokes configuration changes initiated by the manager.

17
CHAPTER 1: Introduction
MIB
Index to the organized data within a network device. It defines the operation
parameters that can be controlled or monitored.
The CSU/DSU MS DBU supports the MIB-II standard, RFC 1213, and Black Box
Enterprise Specific MIB. MIB files are available from Black Box in the support
section of the Black Box Web page at www.blackbox.com.
The CSU/DSU MS DBU’s embedded SNMP feature allows the unit to be accessed
and controlled by a network manager either through a device running SLIP or
async PPP protocol (connected to the CONTROL port of the DSU) or through
a LAN. LAN connection requires the SNMP Ethernet Module (part number
MT140C). This card provides a 10BASE-T Ethernet interface to the LAN.
1.5 TELNET
TELNET provides a password-protected remote login facility for the CSU/DSU MS
DBU. TELNET allows a user on a network manager to control the CSU/DSU MS
DBU through the terminal menus. See Chapter 4 and Appendix C for more
information.
1.6 Dial-Backup Operation
The CSU/DSU MS DBU’s unique DBU cards are field-installable. See Chapter 2
for information on installing DBU cards. The three backup options are described
in the following sections. Contact the local telco provider to determine which
services are available in your area. See Chapter 4 for more information, including
an example of a dial-backup application.
1.7 Dial-Backup Modules
4-W IRE S WITCHED 56 M ODULE
This dial-up 4-wire SW56 card 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. This card 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 async modes.

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CSU/DSU MS DBU
V.34 M ODULE
The V.34 card has all of a V.32 bis modem’s modes of operation, plus V.34 and
V.FC modes. This allows the V.34 option to run synchronous rates up to 33.6 kbps,
as opposed to the V.32 maximum of 14.4 kbps. In asynchronous mode the
throughput at 57.6 kbps is less dependent on data types.
ISDN M ODULE
1B+D Basic Rate ISDN service provides the customer with a switched 56/64 kbps
circuit. In addition to 56 and 64 kbps synchronous DTE rates, the card also
supports synchronous and asynchronous DTE rates of 2.4, 4.8, 9.6, 19.2, and
38.4 kbps per CCITT V.120. The card also supports the DTE rate of 57.6 kbps
async and is compatible with the 4-wire SW56 DBU Module.

19
CHAPTER 2: Installation
2. Installation
2.1 Unpack, Inspect, Power Up
I NSPECTION
Carefully inspect the CSU/DSU MS DBU for any shipping damage. If damage
is suspected, file a claim immediately with the carrier and contact Black Box
Customer Service. Keep the original shipping container for use in shipping
the CSU/DSU MS DBU for repair or for verification of damage during shipment.
The following items are included with the CSU/DSU MS DBU:
• CSU/DSU MS DBU unit
• The user manual
• An 8-position modular to 8-position modular cable
• An 8-position modular to 8-position modular cable and a modular to female
DB25 adapter for access to the Control/SLIP/PPP port
NOTE
The Black Box CSU/DSU MS DBU MIB is available from Black Box in the
support section of the Black Box Web page at www.blackbox.com.
The following items are included with the DBU Modules:
• DBU Module
• An 8-position modular to 8-position modular cable for the 4-wire SW56 and
1B+D ISDN dial-backup options. An 8-position modular to 4-position modular
cable for the V.34 backup option.
You must provide either a male EIA-232 (standard DB25) or a male V.35 interface
cable.
For SNMP management, you must provide access to the CSU/DSU MS DBU
through either a SLIP port, an async PPP port (requires a male DB25 connector),
or a 10BASE-T Ethernet port (requires that an SNMP Ethernet Module be installed