Black Box MicroNTU G.703 AC Series 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]
AUGUST 1998
MT240A-R2 EHN092-V35M
MT240A-48V-R2 EHN092-V35F
EHN092-530M EHN092-X21M
EHN092-530F EHN092-X21F
MicroNTU G.703 (AC)
MicroNTU G.703 (VDC)
MicroNTU G.703
Power
Network
Master
Clock
Test Mode
Loop
Loopback
Normal

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MICRONTU G.703 (AC OR VDC)
FEDERAL COMMUNICATIONS COMMISSION
AND
CANADIAN DEPARTMENT OF COMMUNICATIONS
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 the Canadian Department of
Communications.
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 le ministère des Communications du Canada.
This unit is certified.
The CE symbol on your MicroNTU G.703 indicates that it is in compliance with
the Electromagnetic Compatibility (EMC) directive and the Low Voltage Directive
(LVD) of the Union European (EU).

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MICRONTU G.703 (AC OR VDC)
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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MICRONTU G.703 (AC OR VDC)
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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MICRONTU G.703 (AC OR VDC)
Contents
1. Specifications..............................................................................................................5
2. Introduction ...............................................................................................................6
3. Configuration.............................................................................................................7
3.1 External DIP-Switch Settings..............................................................................7
3.2 Internal Jumper Settings ..................................................................................11
4. Installation................................................................................................................16
4.1 Connection to the G.703 Network ..................................................................16
4.1.1 Twisted-Pair (120-Ohm) Connection....................................................16
4.1.2 Dual Coax BNC (75-Ohm) Connection ...............................................17
4.2 Connection to the Terminal Device................................................................17
4.3 Connection to the Power Source.....................................................................17
5. Operation .................................................................................................................18
5.1 Power-Up ...........................................................................................................18
5.2 LEDs...................................................................................................................18
5.3 Loopback Test (LAL).......................................................................................19
Appendix A. Pin Configurations................................................................................21
Appendix B. Factory Parts and Accessories ...............................................................22
B.1 Basic Standalone Units.....................................................................................22
B.2 Terminal (DTE) Interface Cables ...................................................................22
Appendix C. Safety Warnings and Requirements.....................................................23

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MICRONTU G.703 (AC OR VDC)
1. Specifications
Network Interface G.703
Network Rate 2.048 Mbps
Network Connectors Two BNC (75-ohm) and one modular RJ-45
connector (120-ohm)
Terminal Interface EIA RS-530 (RS-422), X.21, V.35 on UD-26
using cables EHN092
Terminal Rate 2.048 Mbps (all models); 1.024 Mbps, 512 Kbps,
256 Kbps (standalone only)
Terminal Connector UD-26F
Diagnostics Loopback Test
Indicators LEDs for power, network, master clock, and
loopback test
Clocking G.703: Internal, external, network (receive
loop); DTE interface: Internal only
Power MT240A-R2: 115/230 VAC (switch-selectable),
50/60 Hz; MT240A-48V-R2: 48 VDC
Receiver Sensitivity -10 dB (0 dB = 2.4V)
Operating Temperature 32° to 140°F (0° to 60°C)
Humidity 5 to 95%, noncondensing
Altitude Up to 15,000 feet (4570 m)
Size 1.6"H x 7.3"W x 6.6"D (4.1 x 18.6 x 16.8 cm)
Weight 2 lb. (0.9 kg)

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MICRONTU G.703 (AC OR VDC)
2. Introduction
The MicroNTU G.703 performs the tasks of three separate devices:
1. As a modem, the MicroNTU G.703 receives unstructured, synchronous
2.048-Mbps data from a G.703 network and sends it out of its DTE port
(configured as DCE).
2. As an interface converter, the MicroNTU G.703 accepts 120-ohm twisted-pair or
75-ohm dual coax connections (both types of interfaces provided). Then it
converts the signals to EIA-530 (RS-422), V.35, or X.21 format (switchable) on a
UD-26 connector.
3. As a rate adapter, the MicroNTU G.703 lets a lower-bandwidth device—
256 Kbps, 512 Kbps, or 1.024 Mbps—connect to a 2.048-Mbps G.703 link.
The MicroNTU G.703 supports internal, external, or network (receive loop)
clocking on its G.703 interface. Loopback test is built-in, and front-panel LEDs
monitor power, network, master clock, and test loop. Several power-supply options
are available:
MT240A-R2 115/230 VAC (switch-selectable)
MT240A-48V-R2 48 VDC
MT245ARackmount Card
MT246ARackmount Card
RM202, 204, 208, 216 Racks for cards 115/230 VAC (switch-selectable)

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MICRONTU G.703 (AC OR VDC)
3. Configuration
The MicroNTU G.703 is equipped with three sets of eight DIP switches (externally
accessible), as well as seven jumpers (internal). These DIP switches and jumpers
allow configuration of clocking, data rate, test and terminal-interface options. The
MicroNTU G.703 (AC) is also equipped with an internal switch that allows
selection of 115- or 230-VAC power inputs. (This switch is not present in the
MT240A-48V-R2.)
3.1 External DIP-Switch Settings
The MicroNTU G.703’s DIP switches are located on the underside of the unit (see
Figure 3-1). Figure 3-2 shows the orientation of the switch set. The switches are
grouped into two eight-switch sets, and are externally accessible from the
underside of the MicroNTU G.703. All possible settings for the MicroNTU G.703’s
DIP switches are presented in the summary table and descriptions on the following
pages. If you have any questions about configuration, call for technical support.
Figure 3-1. DIP-switch locations.
Switch Set S2
Switch Set S1
ON
OFF

Figure 3-2. Closeup of configuration switches.
Table 3-1. Summary of DIP-switch default settings for set S1
S1 Summary Table
Position Function Factory Default
S1-1 X.21/EIA-530 Off EIA-530 or V.35*
On X.21*
S1-2 Not Used Off
S1-3 Not Used Off
S1-4 Rate Adaptation Off 2.048 Mbps
S1-5 Rate Adaptation Off
S1-6 Data Inversion Off Not Inverted
S1-7 Clock Master/Slave On Master
S1-8 Test Enable Off Front Panel
*Used with S2-1 and S2-2. See the table on page 10.
SWITCH SET S1
The configuration switches on S1 set clocking, rate adaptation, loopback enable,
data invert, and interface (see also Switch S2). The default settings are summarized
in Table 3-1.
S1-1: Terminal Interface (works in conjunction with Switch S2)
Set Switch S1-1 (as well as S2-1 and S2-2) to determine whether the signals passed
between the MicroNTU G.703 and the terminal device will follow the EIA-530
(RS-422), CCITT X.21, or CCITT V.35 standard. If S2-1 and S2-2 are set for
“EIA-530/X.21,” then the setting for S1-1 determines which of those two interfaces
is selected. Note: If S2-1 and S2-2 are set for “V.35,” switch S1-1 must be set to
“Off.” Regardless of the pinout standard chosen, the physical connector is a
female UD-26.
ON
12345678
ON
OFF
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MICRONTU G.703 (AC OR VDC)

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MICRONTU G.703 (AC OR VDC)
S1-1 Setting
Off EIA-530 (RS-422) interface
On X.21 interface
S1-2 and S1-3: Not Used
S1-2 and S1-3 are not used.
S1-4 and S1-5: Rate Adaptation
Set Switches S1-4 and S1-5 together to allow the MicroNTU G.703 to adapt to
terminal devices that run at data rates less than 2.048 Mbps. (The network rate
remains 2.048 Mbps regardless of the terminal-rate adaptation setting.) The setting
you select must match the data rate of your terminal device.
S1-4 S1-5 Setting
Off Off 2.048 Mbps
On Off 1.024 Mbps
Off On 512 Kbps
On On 256 Kbps
S1-6: Data Inversion
Set Switch S1-6 to determine whether or not the data stream from the local DTE is
inverted within the MicroNTU G.703 before being passed to the G.703 network.
Inverting the data stream may be necessary when the MicroNTU G.703 is being
used with an embedded G.703 device that inverts the data on the remote end.
Normally, data inversion is not necessary.
S1-6 Setting
On Data inverted
Off Data not inverted