Black Box MicroNTU G.703 Series User manual

CUSTOMER
SUPPORT
INFORMATION
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
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]
JUNE 1999
MT245A
MT246A
MicroNTU G.703 Card (120 ohm)
MicroNTU G.703 Card (75 ohm)
Power
Loopback
Network
Master
Clock
Normal
MicroNTU
G.703

1
MICRONTU G.703 CARD (120 OR 75 OHM)
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.

2
MICRONTU G.703 CARD (120 OR 75 OHM)
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.

3
MICRONTU G.703 CARD (120 OR 75 OHM)
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.
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.

4
MICRONTU G.703 CARD (120 OR 75 OHM)
Contents
1. Specifications.....................................................................................................5
2. Introduction ......................................................................................................6
3. Configuration....................................................................................................7
3.1 Front-Card Configuration..........................................................................7
3.2 Rear-Card Configuration ...........................................................................9
3.2.1 Configuring the 120-Ohm Rear Card .............................................9
3.2.2 Configuring the 75-Ohm Rear Card .............................................12
4. Installation.......................................................................................................14
4.1 The MicroRack and Power Supplies .......................................................14
4.2 Installing the MicroNTU G.703 Card in the MicroRack Chassis ..........16
4.3 Connection to the G.703 Network ..........................................................17
4.3.1 Twisted-Pair (120-Ohm) Connection (MT245A).........................18
4.3.2 Dual Coax BNC (75-Ohm) Connection (MT246A).....................18
4.4 Connection to the Terminal Device .......................................................18
4.4.1 EIA-530 (RS-422) Terminal Connection (MT245A)....................18
4.4.2 X.21 Terminal Connection (MT246A).........................................19
5. Operation ........................................................................................................20
5.1 Power-Up ..................................................................................................20
5.2 LED Status Monitors ................................................................................20
5.3 Loopback Test (LAL) ..............................................................................22
Appendix. Interface Standards ..........................................................................23

5
CHAPTER 1: Specifications
Network Interface G.703
Network Rate 2.048 Mbps
Network Connectors MT245A: One modular RJ-45 connector
(120-ohm); MT246A: Two BNC (75-ohm)
Terminal Interface MT245A: EIA-530 (RS-422) on DB25 female;
MT246A: CCITT X.21 on DB15 female
Internal Interface Connection to MicroRack 2, 4, 8, or 16
(RM202, RM204, RM208, or RM216) midplane
architecture chassis via (2) 50-pin male card
edge connectors
Terminal Rate 2.048 Mbps
Diagnostics Loopback Test
Indicators LEDs for power, network, master clock, and
loopback test
Clocking Internal, external (network receive loop)
Fuse 400 mA for 120V applications; 200 mA for 240V
applications
Receiver Sensitivity -10 dB (0 dB = 2.4V)
Operating Temperature 32° to 140°F (0° to 60°C)
Humidity 0 to 95%, noncondensing
Altitude Up to 15,000 feet (4570 m)
Power Supply Rackmount power supply is switchable between
120 and 240 VAC; chassis supplies 10 VAC to
the MT245A/MT246A, typical consumption is
1 watt
Size 3.1"H x 0.95"W x 5.4"D (7.9 x 2.4 x 13.7 cm)
1. Specifications

6
MICRONTU G.703 CARD (120 OR 75 OHM)
The MicroNTU G.703 Card receives unstructured, synchronous 2.048-Mbps
data from a G.703 network and sends it to a router, bridge, multiplexor, or
other device. The Card is available in two interface options: 120-ohm twisted
pair to the network and EIA-530 (RS-422) to the terminal (part number
MT245A), or 75-ohm dual coax to the network and X.21 to the terminal
(MT246A). The EIA-530 terminal interface can also be adapted to X.21
using an EIA RS-530 to CCITT X.21 adapter cable (call Black Box).
The MicroNTU G.703 Card is designed to mount in the MicroRack 2, 4, 8,
or 16 (RM202, RM204, RM208, RM216). These operate with a switchable
120/240-VAC power supply or optional 48-VDC power supply. (The power
supply is included with the MicroRack 16. MicroRacks 2, 4, and 8 do not
include the power supply. You must purchase PS460A, the 120/240-VAC unit,
or PS461A, the 48-VDC unit, separately.) The Cards are mounted in a mid-
plane architecture: Front “function” cards and rear “interface” cards can be
hot-swapped independently, providing great flexibility.
The MicroNTU G.703 Card supports internal or external network (receive
loop) clocking. Loopback test is Local Analog Loop (LAL) via front-panel
mounted switch, and front-panel LEDs monitor power, network, master clock,
and test loop.
2. Introduction

7
CHAPTER 3: Configuration
The MicroNTU G.703 Card (MT245A) uses seven jumpers (or four for
MT246A), which allow the unit to be configured for a wide range of
applications. Designed around a mid-plane architecture, the MicroNTU
G.703 Card incorporates both front and rear cards. Configuration of both
may be necessary. The jumpers are accessible when the cards are slid out of
the rack chassis. Once configured, the MicroNTU G.703 Card is designed to
operate transparently, without need for frequent re-configuration: Just set it
and forget it.
3.1 Front-Card Configuration
The MicroNTU G.703 Card front card has two jumpers (LK6 and LK7), which
are mounted on the PC board (see Figure 3-1). These jumpers set clocking
and data inversion.
Figure 3-1. Jumper locations.
3. Configuration
LK7
LK6

8
MICRONTU G.703 CARD (120 OR 75 OHM)
LK6: Tx Clock Source
Jumper LK6 is a three-post jumper. Figure 3-2 shows the three possible
orientations of this jumper.
Figure 3-2. Possible strap positions for jumper LK6.
The setting for jumper LK6 determines whether the MicroNTU G.703 Card
will provide an internal clock, or will be receiving a clock from an external
device.
LK6 Setting
Position 1 and 2 Internal/Master Clock (Default) [Master]
Position 2 and 3 Network Clock - Slave - Network
NC Not a valid setting
3 2 1
Front of Card
3 2 1 3 2 1

9
CHAPTER 3: Configuration
LK7: Data Inversion
The setting for jumper LK7 determines whether data will be inverted or not
inverted.
LK7 Setting
Strap Installed Data Inverted
Strap Omitted Data Not Inverted (Default)
3.2 Rear-Card Configuration
The MicroNTU G.703 Card has two rear interface card options: for the
MT245A, 120-ohm (modular) network and EIA-530 (DB25) terminal, or,
for the MT246A, 75-ohm (dual BNC) network and X.21 (DB15) terminal.
Each is configured differently.
3.2.1 C ONFIGURING THE 120-O HM R EAR C ARD
The 120-ohm rear card has five configuration jumpers (LK1 through LK5).
Figure 3-3 shows the locations of the jumpers on the 120-ohm rear card.
Figure 3-3. 120-ohm rear card jumper locations.
LK5
LK4
LK1
LK2
LK3