Black Box G.703 NTU w/V35 User manual

CUSTOMER
SUPPORT
INFORMATION
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FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
BLACK BOX
NETWORK SERVICES
®®
G.703 NTU
w/V35
G.703 NTU w/V35
TMRDTDE1 Link
MARCH 2006
MT331A

G.703 NTU W/V35
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CE NOTICE
The CE symbol on your Black Box equipment indicates that it is in compliance
with the Electromagnetic Compatibility (EMC) directive and the Low Voltage
Directive (LVD) of the European Union (EU). A Certificate of Compliance is
available by contacting Technical Support.
RADIO AND TV INTERFERENCE
The Multi-Rate Ethernet Extender generates and uses radio frequency energy,
and if not installed and used properly-that is, in strict accordance with the manu-
facturer’s instructions-may cause interference to radio and television reception.
The Multi-Rate Ethernet Extender has been tested and found to comply with the
limits for a Class A computing device in accordance with specifications in Sub-
part B of Part 15 of FCC rules, which are designed to provide reasonable protec-
tion from such interference in a commercial installation. However, there is no
guarantee that interference will not occur in a particular installation. If the Ether-
net Extender does cause interference to radio or television reception, which can
be determined by disconnecting the unit, the user is encouraged to try to correct
the interference by one or more of the following measures: moving the comput-
ing equipment away from the receiver, re-orienting the receiving antenna and/or
plugging the receiving equipment into a different AC outlet (such that the com-
puting equipment and receiver are on different branches).

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FCC PART 68
TRADEMARKS USED IN THIS MANUAL
All applied-for and registered trademarks are the property of their respective owners.
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 ref-
erencia 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 interfi-
era su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra
o superficie similar puede bloquea la ventilación, no se debe colocar en libre-
ros 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.
Caution
The MT331A is not intended to be connected to the pub-
lic telephone network.

G.703 NTU W/V35
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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.
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 recomen-
daciones 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 derra-
mados 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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CONTENTS
CE Notice .................................................................................................... 2
Radio and TV Interference.......................................................................... 2
FCC Part 68................................................................................................. 3
Trademarks Used In This Manual............................................................... 3
Normas Oficiales Mexicanas (NOM) Electrical Safety Statement............. 3
1. General Information ....................................................................................7
1.1 Features ...............................................................................................7
1.2 Description ......................................................................................... 7
2. Configuration............................................................................................... 8
2.3 DIP switch configuration.................................................................... 8
2.3.1 Switch SW1-1 through SW1-8................................................ 9
2.3.2 Switch SW1-1 line coding: HDB3 (default)............................ 9
2.3.3 SW1-2 Local loop: inactive (default).................................... 10
2.3.4 SW1-6 and SW1-7 clock modes............................................ 10
2.3.5 SW1-8: Enable/disable loop tests from DTE......................... 11
3. Installation................................................................................................. 12
3.4 Connecting the twisted pair (120 Ohm) to the G.703 network ........ 12
3.5 Connecting the V.35 serial port........................................................ 12
3.5.6 Connecting to a “DTE” device.............................................. 13
3.5.7 Connecting to a “DCE” device.............................................. 13
3.6 Power connection ............................................................................. 13
3.6.8 Universal AC power (100–240VAC).................................... 13
4. Operation................................................................................................... 14
4.7 Power-up........................................................................................... 14
4.8 LED status monitors......................................................................... 14
4.9 Local loop diagnostics...................................................................... 15
4.9.9 Operating local loopback (LL) .............................................. 15
A. G.703 specifications.................................................................................. 16
B. Interface pin assignment............................................................................ 17

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1. General Information
Thank you for your purchase of this Black Box product. If any questions arise
during installation or use of the unit, contact Black Box Tech Support at
[phone].
1.1 Features
•
Terminates G.703 E1 service (2.048 Mbps)
•
Switch-selectable AMI or HDB3 line encoding options
•
Local loopback diagnostics
•
Internal, External, and G.703 network timing
• CE approval
•
100-240VAC
•
Conforms to ONP requirements CTR 12 for connection to international Tele-
com networks
1.2 Description
The MT331A receives clear channel E1/G.703 (2.048 Mbps) data from the
telco’s digital data network. The MT331A terminates the G.703 telco interface
and converts the data for transmission to a user-oriented serial. The MT331A can
connect to a Router, FRAD, PABX or Multiplexer over its serial interface at
2.048 Mbps.

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2. Configuration
The MT331A features configuration capability via hardware DIP switches. This
section describes all possible DIP switch configurations of the MT331A.
2.3 DIP switch configuration
The MT331A has one internal DIP switch that allow configuration for a wide
range of applications. The switch is accessed from the underside of the MT331A.
Figure 1 shows the location of the DIP switch on the bottom of the printed
circuit board.
Figure 1. Underside of MT331A showing location of DIP switches
The MT331A DIP switch can be configured as either “ON” or “OFF”. Figure 2
shows the orientation of the DIP switch with respect to ON/OFF positions.
Figure 2. Close-up of configuration switches
S1
S2
ON
OFF
Front
Rear

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2.3.10 S
WITCH
SW1-1
THROUGH
SW1-8
2.3.11 S
WITCH
SW1-1
LINE CODING
: HDB3 (
DEFAULT
)
Use Switch SW1-1 to control the Network Line Coding options. Set these
options to be the same as the Line Coding given to you by your Service Provider.
If you are using two MT331As together as short range modems, set both units
to HDB3.
Options: HDB3, AMI
HDB3: In this line coding, the transmitter substitutes a deliberate bipolar viola-
tion when excessive zeros in the data stream are detected. The receiver recog-
nizes these special violations and decodes them as zeros. This method enables the
network to meet minimum pulse density requirements. UnlessAMI is required in
your application, HDB3 should be used whenever possible.
AMI: Alternate Mark Inversion defines a pulse as a “mark,” a binary one, as
opposed to a zero. In an E1 network connection, signals are transmitted as a
sequence of ones and zeros. Ones are sent as pulses, and zeros are sent as spaces,
i.e., no pulse. Every other pulse is inverted from the previous pulse in polarity, so
that the signal can be effectively transmitted. This means, however, that a long
sequence of zeros in the data stream will cause problems, since the NTU receiv-
ing the signal relies on the signal to recover the 2.048 Mbps clock.
Position Function Factory Default Selected Option
SW1-1 Line Code OFF HDB3
SW1-2 LLB OFF OFF
SW1-3 Reserved
SW1-4 Reserved
SW1-5 Reserved
SW1-6 Clock Mode OFF Received
Recovered
SW1-7 Clock Mode OFF Received
Recovered
SW1-8 TM from
DTE OFF Enabled
SW1-1 Line Encoding
OFF HDB3
ON AMI

G.703 NTU W/V35
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If you must use AMI, you should ensure that the data terminal equipment con-
nected to the unit provides a minimally acceptable pulse density. For this reason,
there are advantages to using HDB3 instead. AMI coding does not inherently
account for ones density. To meet this requirement, the user should ensure that
the data inherently meets pulse density requirements.
2.3.12 SW1-2 L
OCAL LOOP
:
INACTIVE
(
DEFAULT
)
Use SW1-2 to activate/deactivate local loopback test.
2.3.13 SW1-6
AND
SW1-7
CLOCK MODES
Use switches SW1-6 and SW1-7 to configure the MT331A for internal, external,
or receive recover clock mode.
2.3.14 SW1-8: E
NABLE
/
DISABLE LOOP TESTS FROM
DTE
Use switch SW1-8 to allow MT331A to enter loopback tests when the DTE
raises the appropriate loop request pin.
SW1-2 Setting
OFF Local Loopback Inactive
ON Local Loopback Active
SW1-6 SW1-7 Clock Mode
ON ON Network (Received Recovered)
ON OFF Internal
OFF ON External
OFF OFF Network (Received Recovered)
Network
Clock
Transmitter timing is derived using the received line signal
(received recovered) from the network.
Internal
Clock
Transmitter timing is derived from an internal clock source.
External
Clock
Transmitter timing is derived from DTE terminal timing.
SW1-8 Setting
OFF Response to DTE Loopback Request Enabled
ON Response to DTE Loopback Request Disabled

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3. Installation
Once the MT331A is properly configured, it is ready to connect to the G.703
interface, to the serial port, and to the power source (see Figure 3). This section
describes how to make these connections.
\
Figure 3. Rear panel
3.4 Connecting the twisted pair (120 Ohm) to the G.703 network
The MT331A is equipped with a single RJ-48C jack for connections to a 120
Ohm twisted pair G.703 network interface. Use Figure 4 below to connect the
120 Ohm G.703 network channel.
Figure 4. G.703 120-Ohm connection
3.5 Connecting the V.35 serial port
The MT331A supports V.35 serial port connections. This section describes how
to connect the serial ports to your terminal equipment.
Made in the USA
Interface
Power
Line
Power
V.35 Interface
Line
(No Connection) 8
(No Connection) 7
(No Connection) 6
(TX+) 5
(TX-) 4
(No Connection) 3
(RX-) 2
(RX+) 1
8
7
6
5
4
3
2
1

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3.5.15 C
ONNECTING TO A
“DTE”
DEVICE
The serial port on the MT331A/C (V.35 version) is hard-wired as a DCE. There-
fore these modules “want” to plug into a DTE such as a terminal, PC or host.
When making the connection to your DTE device, use a straight through cable
of the shortest possible length—we recommend 6 feet or less. When purchasing
or constructing an interface cable, please refer to the pin diagrams in
Appendix B. on page 15 as a guide.
3.5.16 C
ONNECTING TO A
“DCE”
DEVICE
If the MT331A serial interface is hard-wired as a DCE, you must use a null
modem cable when connecting to a modem, multiplexer or other DCE device.
This cable should be of the shortest possible length—we recommend 6 feet
or less.
3.6 Power connection
3.6.17 U
NIVERSAL
AC
POWER
(100–240VAC)
The MT331A uses a 5VDC, 2A universal input 100–240VAC, power supply
(center pin is +5V). The universal input power supply has a male IEC-320 power
entry connector. This power supply connects to the MT331A by means of a barrel
jack on the rear panel. Many international power cords are available for the uni-
versal power supply.
The MT331A powers up as soon as it is plugged into an AC outlet—there is no
power switch.
WARNING
There are no user-serviceable parts in the
power supply section of the MT331A.
Contact Black Box technical support at
[phone] for more information.

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4. Operation
When the MT331A has been properly configured and installed, it should operate
transparently. This sections describes power-up, LED status monitors, and the
built-in loopback test modes.
4.7 Power-up
Before applying power to the MT331A, refer to section 3.6, “Power connec-
tion” on page 11 and ensure that the unit is properly connected to the appropri-
ate power source.
4.8 LED status monitors
The MT331A features six front panel LEDs that monitor connections on the
G.703 and signaling, error and test modes. Figure 5 shows the front panel loca-
tion of each LED. Descriptions of each LED follow Figure 5.
Figure 5. MT331A Front panel
E1
Link
(Active Green) Solid green (On) indicates that the end to end E1 Link is
up, signifying that the link is active.The E1 Link LED is Off when the link
is down.
TD &
RD
Glows yellow to indicate an idle condition of Binary “1” data on the
respective terminal interface signals. Green indicates Binary “0” data.
TM (ActiveYellow) SolidYellow indicates an ActiveTest Mode.The unit may
be placed in test mode by the local user.
E1 Link TD RD TM
E1 Link
TD RD
TM
G.703 NTU w/V35

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4.9 Local loop diagnostics
The MT331A offers V.54 loop diagnostics. Use these diagnostics to test the NTU
and any communication links. This test can be activated via DIP switches or via
signals on the MT331A serial port interface.
4.9.18 O
PERATING LOCAL LOOPBACK
(LL)
The Local Loopback (LL) test checks the operation of the local MT331A, and is
performed separately on each unit.Any data sent to the local MT331A in this test
mode will be echoed (returned) to the user device (i.e., characters typed on the
keyboard of a terminal will appear on the terminal screen)
Figure 6. Local Loopback for a network termination application
To perform a LL test, follow these steps:
1. Activate LL. This may be done in one of two ways:
— Place the DIP switch SW1-2 to the “ON” position.
— Activate the “LL” signal on the DTE. If you are not sure which lead is
the “LL” signal, please refer to appendix B. “Interface pin assignment”
on page 15.
2. Verify that the data terminal equipment is operating properly and can be
used for a test.
Serial
Device Serial Device
MT311A
Receive
Recover
Clocking
Internal
Clocking Cable
Span
G.703 NTU
MT331A G.703 NTU
MT331A
Clock/
Data
Clock/
Data
Clock/
Data
Data
Data
MT311A

G.703 NTU W/V35
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A. G.703 specifications
Network Data Rate 2.048 Mbps
Network Connector RJ-48C
Nominal Impedance 120 Ohm
Line Coding Selectable AMI or HDB3
Line Framing G.703 (Unframed)
Clocking Internal or Network (Receive Recover)
Distance Maximum 1.8 km (6,000 ft.) on 24 AWG Cable
Configuration One 8-Position DIP Switches
Power Supply +5VDC External power supply/100–240VAC, 50–
60Hz, 0.4A
Humidity Up to 90% non-condensing
Temperature 0 to 50˚ C
Dimensions: 9.0 x 5.3 x 2.0 cm (3.5”L x 2.1”W x 0.78”H)

G.703 NTU W/V35
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B. Interface pin assignment
V.35 Interface
(M/34F Female Connector)
(DCE Configuration)
Pin # Signal Pin # Signal
B SGND (Signal Ground) R RD (Receive Data)
C RTS (Request to Send) S TD/ (Transmit Data-B)
D CTS (Clear to Send) T RD/ (Receive Data-B)
E DSR (Data Set Ready) U XTC (External Transmit Clock)
F CD (Carrier Detect) V RC (ReceiveTiming)
H DTR (Data Terminal
Ready) W XTC/ (External Transmit Clock)
L LLB (Local Line Loop) X RC/ (ReceiveTiming)
M TM (Test Mode) Y TC (Transmit Clock-A)
N RDL (Remote Digital
Loop) AA TC/ (Transmit Clock-B)
P TD (Transmit Data)

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V.35 To V.35 (Straight-through Cable)
Pin Out
V.35 To V.35 (Cross Over Cable) Pin
Out
Pin Function Pin Function Pin
A Frame Ground A Frame
Ground A
B Signal Ground B Signal
Ground B
CRTSC DCD F
DNCDNCD
E DSR E DTR H
F DCD F RTS C
H DTR H DSR E
KNCKNCK
LNCLNCL
P TD (A) P RD (A) R
R RD (A) R TD (A) P
S TD (B) S RD (B) T
T RD (B) T TD (B) S
U SCTE (A) U RT (A) V
V RT (A) V SCTE (A) U
W SCTE (B) W RT (B) X
X RT (B) X SCTE (B) W
YNCYNCY
AA NC AA NC AA

G.703 NTU W/V35
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Notes
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© Copyright 2006. Black Box Corporation. All rights reserved.
1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
BLACK BOX®®
NETWORK SERVICES