Black Box MT160A User manual

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 1999. Black Box Corporation. All rights reserved.

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INFORMATION
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APRIL 1999
MT160A PS462A
MT161C-25 PS463A
MT161C-V35 RM202
PS460A RM204
PS460AE RM208
PS461A RM216
MicroCSU/DSU Cards
MicroRACK
ON
OFF
Power
MicroRack System
AC Power Supply

1
TRADEMARKS
TRADEMARKS USED IN THIS MANUAL
AT&T is a registered trademark of AT&T.
MCI is a registered trademark of MCI Telecommunications Corporation.
Sprint is a registered trademark of U.S. Sprint Communications Ltd.
Any trademarks used in this manual are acknowledged to be the property of the
trademark owners.

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MicroCSU/DSU Cards and MicroRacks
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
igital 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.

3
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.

4
MicroCSU/DSU Cards and MicroRacks
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.

5
CONTENTS
Contents
Chapter Page
1. Specifications ........................................................................................................6
2. Introduction ........................................................................................................10
2.1 Overview ....................................................................................................10
2.2 Features......................................................................................................11
3. Before You Begin ................................................................................................12
3.1 Dedicated DDS Configuration ................................................................12
3.2 Campus Area Short-Haul Configuration ................................................12
3.3 Network Interface Connection ................................................................12
4. Configuration ......................................................................................................13
4.1 Front-Panel LEDs ......................................................................................13
4.2 Source of Configuration ..........................................................................14
4.2.1 Hardware Switches ..........................................................................15
4.2.2 Software Switches ............................................................................21
4.3 Rear Card Configuration..........................................................................29
4.3.1 MicroCSU/DSU DB25 Rear Strap Settings ..................................31
4.3.2 MicroCSU/DSU V35 Rear Strap Settings ....................................32
5. Installation ..........................................................................................................34
6. DDS Testing ........................................................................................................38
6.1 Local Analog Loopback Testing ..............................................................38
6.2 Remote Digital Loopback Testing ..........................................................39
6.3 V.52 BER Test Generator..........................................................................40
6.4 Telco Testing ............................................................................................40
6.4.1 CSU Loop ........................................................................................41
6.4.2 DSU Loop ........................................................................................41
Appendix A. Cable Recommendations ..................................................................42
Appendix B. Interface Pin Assignment ..................................................................43
B.1 DDS Interface ............................................................................................43
B.2 M/34 Connector, Terminal Interface ....................................................43
B.3 DB25 Connector, Terminal Interface ....................................................44
Appendix C. Transmitter Clock Source During Test Loops ................................45

6
MicroCSU/DSU Cards and MicroRacks
1. Specifications
MicroCSU/DSUs (MT160A, MT161C-25, MT161C-V35)
DDS Type — Dedicated DDS
Transmission Format — Asynchronous, synchronous
Internal Interface — Connection to rack chassis via a 50-pin male card edge
External Interface — DB25 female, M/34 female, RJ-48S
Standards — AT&T 62310 compliant
DDS Line Rates — 2.4, 4.8, 9.6, 19.2, 56, and 64 Kbps
DTE Rates — 2.4, 4.8, 9.6, 19.2, 38.4, 56, 57.6, and 64 Kbps
Leads Supported — MT160A, MT161C-V35: B, C, D, E, F, H, L, M, N, P, R, S, T, U,
V, W, X, Y, AA; MT161C-25: 1–9, 11, 12, 14–18, 20, 21, 24, 25
Control Port — Configuration and diagnostics
Transmission Line — 4-wire
Applications — DDS point-to-point or multipoint; campus-area point-to-point
Indicators — (10) LEDs: POWER, TD, RD, CTS, CD, DTR, NS, OS, ER, and TM
Operation — Full duplex
Clocking — Internal, External, Recovered
Diagnostics — V.54 compliant local and remote loopback tests; V.52 compliant 511
BER test, telco CSU and DSU loops
Power Supply — Rackmount power supply is switchable between 120 and 240 VAC;
chassis supplies 10 VAC to the MicroCSU/DSU, typical consumption is 1.5W per
slot
Fuse — 400 mA for 120V applications; 200 mA for 240V applications
Operating Temperature — 32° to 114°F (0° to 45°C)

7
CHAPTER 1: Specifications
Storage Temperature — -40° to 176°F (-40° to 80°C)
Humidity — Up to 95%, noncondensing
Size — MT160A: 2.5"H x 5"W x 1"L (6.4 x 12.7 x 2.5 cm); MT161C-25, MT161C-
V35: 2.5"H x 4.5"W x 1"L (6.4 x 11.4 x 2.5 cm)
Weight — 1 lb. (0.5 kg)
MicroRacks (RM202, RM204, RM208, RM216)
Indicators — Indicators are on the front card (MT160A)
Number of Slots — RM202: 2; RM204: 4; RM208: 8; RM216: 16
Power Source — Internal
Input Voltage — 120 VAC
Input Current/Amps — 200 mA
Input Connector Type — IEC 950
Connector Style — On the CSU/DSU rear cards
Operating Temperature — 32° to 114°F (0° to 45°C)
Storage Temperature — -40° to 176°F (-40° to 80°C)
Humidity — 0 to 95%, noncondensing
Size — RM202: 3.5"H x 3.5"W x 7.5"D (8.9 x 8.9 x 19.1 cm); RM204: 3.5"H x 5.5"W
x 7.5"D (8.9 x 14 x 19.1 cm); RM208: 3.5"H x 9.5"W x 7.5"D (8.9 x 24.1 x 19.1 cm);
RM216: 3.5"H x 19"W x 7.5"D (8.9 x
48.3 x 19.1 cm)
Weight — RM202, RM208, RM216: 5 lb. (2.2 kg); RM204: 4 lb. (1.8 kg)
Power Supply (PS460A)
Power Source — Internal
Input Voltage — 110 volts AC

8
MicroCSU/DSU Cards and MicroRacks
Power Supply (PS460AE)
Power Source — Internal
Fuses — (4) Included (2 in the drawer and 2 spares)
Input Voltage — 115 or 230 volts AC, autosensing
Power Supply (PS461A)
Power Source — Internal
Input Voltage — 48 volts DC
Input Connector Type — PS461A: Terminal screw connections
Indicators — Power, DC input
Size — 3.5"H x 1.5"W x 7"D (8.9 x 3.8 x 17.8 cm)
Weight — 1 lb. (0.5 kg)
Power Supplies (PS462A and PS463A)
F RONT P
OWER -S UPPLY C ARD
Power Supply — PS462A: 24 VDC; PS463A: 12 VDC
Input Voltage — PS462A: 13–36VDC; PS463A: 10–20 VDC
Input Protection — PS462A: Triggered at 39 VDC; PS463A: Triggered
at 22 VDC
Maximum Input
Current — PS462A: 2A @ 18 VDC; PS463A: 4A @ 10 VDC
Isolation Voltage — 500V RMS, input to output
Output Voltage — 12 VAC @ 2A
Output Power — 24W
Switches — Power on/off
Indicators — Power, DC Input

9
CHAPTER 1: Specifications
R EAR P OWER -S UPPLY C ARD
Connection — Cage-clamp terminal block with +DC In, -DC In, Frame
Ground, Alarm, Alarm C, +DC Out, -DC Out
Wire — 26-14 solid or stranded cable
Alarm — Opens when power is attached and closes when power
is disconnected

10
MicroCSU/DSU Cards and MicroRacks
2. Introduction
2.1 Overview
The MicroCSU/DSU operates either synchronously or asynchronously and
supports data rates to 64 Kbps. An easily accessible control port allows the user to
enable diagnostic utilities, including V.54 and V.52 test. Ten easy-to-read LEDs
monitor data and control signals.
The Cards are AT&T®compliant and are fully compatible with DDS, Clear
Channel 64, and other digital services available from major service providers
including AT&T, Sprint®, and MCI®. They can also be used as high-speed modems
for private twisted pair.
In order for your MicroCSU/DSU to function properly, you will need one front
card (MT160A), one rear card (MT161C-25 or MT161C-V35), one power supply
(PS460A, PS461A, PS462A, or PS463A), and one MicroRack (RM202, RM204,
RM208, or RM216).
The MicroCSU/DSU Cards are designed to mount in any size MicroRack.
Depending on which model MicroRack you choose, it will hold up to 16 cards.
Measuring only 3.5 inches high, the Card is designed to occupy only 2U in a 19-
inch rack. The MicroRacks are powered by either the MicroRack AC Power Supply
(PS460A) or a MicroRack DC Power Supply (PS461A, PS462A, or PS463A). The
MicroRacks use mid-plane architecture (the front card can be plugged into
different rear cards). Therefore, the MicroCSU/DSU Cards can have several
interface options and can be switched with other short-haul cards.
The table on the next page lists the names and codes of the products described
in this manual.

11
CHAPTER 2: Introduction
Code Product Name
MT160A MicroCSU/DSU Front Card
MT161C-25 MicroCSU/DSU DB25 Rear
MT161C-V35 MicroCSU/DSU V35 Rear
PS460A MicroRack AC Power Supply
PS461A MicroRack 48-VDC Power Supply
PS462A MicroRack 24-VDC Power Supply
PS463A MicroRack 12-VDC Power Supply
RM202 MicroRack 2
RM204 MicroRack 4
RM208 MicroRack 8
RM216 MicroRack 16
2.2 Features
• Operates over dedicated digital lines.
• Supports rates of 56 and 64 Kbps and all sub-rates.
• Provides both RS-232 and V.35 interfaces.
• Features V.52 and V.54-compliant tests.
• Easy-to-read LEDs monitor data and line signals.
• AT&T 62310 compliant.
• Can be used as a high-speed modem for private twisted pair.

12
MicroCSU/DSU Cards and MicroRacks
3. Before You Begin
This chapter describes how to install the MicroCSU/DSU for dedicated operation
or for use as a campus-area short-haul modem.
3.1 Dedicated DDS Configuration
The MicroCSU/DSU can easily be configured for dedicated DDS operation by
means of the DIP switches on the bottom of the enclosure. Set the Line Rate
to match the rate of service to which you subscribe. Set the Mode switches for
Network Clocking. The Rate Converter and Data Format options should be set
as required for your application. The remaining options may also need to be set
depending on your terminal equipment and your application.
3.2 Campus Area Short-Haul Configuration
The unit can also be used for campus area point-to-point short-haul applications
on private twisted-pair wires. Set the Line Rates the same on both units. Set the
Mode switch for the appropriate Transmit Clock Mode for your application.
Internal, External, and Looped Clock Modes are available. Set the remaining
options as needed by your terminal equipment or your application.
3.3 Network Interface Connection
The Network Interface is an 8-position modular connector. Connect this port to
the RJ-48S jack provided by the digital data service provider. If you are using the
MicroCSU/DSU for private short-haul communication, the twisted-pair cable will
connect to this port. See Appendix B for the pin assignments of this connector.

13
CHAPTER 4: Configuration
4. Configuration
Before you can operate your MicroCSU/DSU, you must configure the unit. This
chapter describes reading the LED status monitors, setting the DIP switches, and
using the control port.
4.1 Front-Panel LEDs
There are ten front-panel status LEDs that indicate the condition of the CSU/DSU
and the communication link. Figure 1 shows the location of each LED. Following
Figure 1 is a description of each LED’s function.
Figure 1. The MicroCSU/DSU’s LEDs.
DTR Power
TD
RD
CD CTS
NS OS
TM ER
Remote Analog
511 511/E

14
MicroCSU/DSU Cards and MicroRacks
• POWER will glow red when the proper power is applied to the rack.
• TD and RD will glow red to indicate an Idle condition or Binary “1” data on
the respective terminal interface signals. Green indicates Binary “0” data.
• CTS will glow red to indicate an Off condition. Green indicates an On
condition. When on, the unit is ready to send data. If CTS remains off,
check the Forced RTS, Circuit Assurance, and Anti-Streaming Settings.
• CD will glow red to indicate that the Idle code is being received. Green
indicates that data is being received.
• DTR will glow to indicate that the DTR signal from the terminal is active.
• NS indicates No Signal. This means the MicroCSU/DSU receiver does not
detect a signal from the digital service provider (or, in the case of short-haul
operation, from the remote MicroCSU/DSU). If NS is lit, check for an
unplugged cable, broken wire, or an incorrect Line Rate selection.
• OS indicates Out-of-Service. This means the MicroCSU/DSU has received an
Out-of-Service signal from the digital service provider and indicates a problem
with the service provider’s equipment. If this condition persists, contact your
service provider.
• ER indicates the likelihood of a Bit Error in the received signal. ER will flash
if the MicroCSU/DSU receives illegal bi-polar violations. During the 511 or
511/E test, ER will flash to indicate that the Test Pattern Detector has detected
a bit error.
• TM indicates Test Mode. It will light if the unit is placed into a test mode. The
unit can be placed in test mode by the local user, by the remote user, or by the
service provider.
4.2 Source of Configuration
The unit defaults to the use of Hardware Switches for configuration. It can also be
set to use Soft Switches for configuration, in which case the Hardware Switches will
be ignored.

15
CHAPTER 4: Configuration
4.2.1 H ARDWARE S WITCHES
It is possible to override the Soft Switches and force the unit to use the Hardware
Switches. To do this, powerup the unit once with the Line Rate (SW1-1, 1-2, 1-3)
set to OFF, OFF, OFF. Then set the Hardware Switches as you require and
powerup the unit again.
Figure 2. The MicroCSU/DSU Front Card, bottom view, showing the
location of the DIP switches.
The sixteen DIP switches can be configured as either On or Off. Figure 3 shows the
orientation of the DIP switches with respect to ON/OFF positions.
SW2SW1
Front
Interface
Driver
Board
MSD LSD
Address Rotary
Switches

16
MicroCSU/DSU Cards and MicroRacks
Figure 3. Close-up of DIP switches showing ON/OFF positions.
T ERMINAL I NTERFACE
The MicroCSU/DSU supports RS-232 and V.35 terminal interface electrical
specifications by means of an interface driver board. Install this board by observing
the markings “This side up for RS-232,” “This side up for V.35,” and “Front.” (The
arrow should point toward the front panel.)
S WITCH S ET 1
The configuration switches on switch set 1 (SW1) allow you to specify Line Rate,
Circuit Assurance, Force RTS, Character Length, Data Format, and DSR System
Status. Table 1 (on the next page) summarizes the SW1 switch settings, including
the factory defaults. Following the chart is a description of each switch setting.
SWITCH SET 1 SUMMARY
Position Function Factory Default
Switch SW1-1 Line Rate Off 56,000 bps
Switch SW1-2 On
Switch SW1-3 On
Switch SW1-4 Circuit Assurance Off Disabled
Switch SW1-5 Force RTS Off Enabled
Switch SW1-6 Character Length Off 10-Bit
Switch SW1-7 Data Format Off Synchronous
Switch SW1-8 DSR System Status Off Disabled
Table 1. Summary of switch settings and factory defaults
12345678
ON ON
OFF

17
CHAPTER 4: Configuration
Line Rate
These switches control the signaling rate on the line or RJ-48S port of the unit.
They should be set to match the speed of your digital service.
SW1-1 SW1-2 SW1-3 Setting
On On On 2.4 Kbps
On On Off 4.8 Kbps
On Off On 9.6 Kbps
On Off Off 19.2 Kbps
Off On On 56 Kbps
Off On Off 64 Kbps
Off Off Off Force configuration
pointer to default to
Hardware Switches
Circuit Assurance
The transmitter and the CTS output can be configured to go On only when a
working communication circuit is established. If Circuit Assurance is used, enable
it on only one end of the communication link.
SW1-4 Circuit Assurance Description
On Enabled CTS will go low and the transmitter will be
held off if the receiver is in the No Signal
state or CD is low
Off Disabled The transmitter and CTS will operate
without regard to the receiver state
Force RTS
The RTS input can be forced on, ignoring the terminal’s RTS signal. RTS controls
the transmitter by either sending the user’s data or sending an idle code.
SW1-5 RTS Forced On Description
Off Enabled An On (high) condition is transmitted
regardless of the state of this unit’s RTS
input
On Disabled The RTS input controls the transmitter