Black Box SHM-NPR/RJ-45 Series User manual

JUNE 2000
ME822A-F
ME822A-M
Short-Haul Modems, NPR/RJ-45
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]
SHM-NPR
DCE
DTE

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SHM NPR/RJ-45
TRADEMARKS USED IN THIS MANUAL
Any trademarks mentioned in this manual are
acknowledged to be the property of the trademark
owners.

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SHM NPR/RJ-45
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 classe A prescrites dans le Règlement sur le
brouillage radioélectrique publié par le ministère des Communications du Canada.

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SHM NPR/RJ-45
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.

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SHM NPR/RJ-45
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.

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SHM NPR/RJ-45
1. Specifications
Data Rates — 19,200 bps (according to the RS-232
interface
Transmission Format — Asynchronous
Transmission Mode — Full duplex
Cable Type — 4-wire, unloaded, customer-owned
twisted-pair cable with DC continuity
Connectors — RS-232: DB25 (male for ME822A-M,
female for ME822A-F); Line: RJ-45 female
Operating Temperature — 32 to 112°F (0 to 45°C)
Humidity Tolerance — Up to 95% relative humidity
Power — From a terminal or computer. These signals
must be available at the RS-232 connector:
• DCE configuration of the SHM when connected
to a DTE: The + and - voltage is taken from pins 2,
4, 9, and 20

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SHM NPR/RJ-45
• DTE configuration of the SHM when connected to
a DCE: The + and - voltage is taken from pin 3, 5,
6, 8, or 9.
NOTE
When power is removed from the DCE or DTE to which the
SHM is connected, the SHM can no longer send a signal to
the remote receiver. Under this condition, the idled cable is
susceptible to noise reception. The remote receiver may
output erroneous data bits as a result of noise.
Size — 2.2" x 1.8" x 0.8" (5.6 x 4.6 x 2 cm)

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SHM NPR/RJ-45
2. Description
The Short-Haul Modem NPR/RJ-45 uses the latest
surface-mount technology to attain high-quality short-
range modem performance in a low-profile package.
The SHM operates at full duplex at data rates up to
19.2 Kbps over 2 twisted pair. Requiring no AC power or
batteries, the SHM supports distances up to 17 miles
(27.4 km).
With an externally accessible DCE/DTE switch, the
SHM allows easy connection to any device without
opening the unit. Termination is via RJ-45 connectors.
Table 2-1. Transmission Distances
Data Rate Wire Gauge
(bps) 19 AWG (0.9 mm) 24 AWG (0.5 mm) 26 AWG (0.4 mm)
19,200 6.2 (9.9) 3.7 (5.9) 1.2 (1.9)
9600 7.5 (12) 4.9 (7.8) 2.5 (4)
4800 8.7 (13.9) 5.6 (9) 3.7 (5.9)
2400 11.8 (18.9) 8 (12.8) 4.9 (7.8)
1200 17 (27.2) 11.8 (18.9) 8 (12.8)
These distances are for a noiseless environment with 20% or less
of peak-to-peak gross distortion. Distances and rates listed are
SHM to SHM.

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SHM NPR/RJ-45
The SHM has the option of being configured as either
DCE or DTE devices. Set the switch located on the top
of the printed circuit board to the DCE or DTE position.
NOTE
You don’t have to open the plastic case to change the
switch setting.
Figure 2-1. The DCE/DTE Switch.
The SHM meets the requirements for FCC Part 15 (RFI
limits for Class A peripheral devices).
DCE DTE

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SHM NPR/RJ-45
Figure 2-2. The SHM’s Components.
DCE DTE
DCE/DTE Switch
RS-232 Connection
(male or female)

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SHM NPR/RJ-45
3. Installation
The SHM plugs directly into the back of a terminal or
computer. This eliminates the need for an RS-232C data
cable. No power is required from an external source
because the unit is powered entirely by the terminal or
computer’s control and data signals.
The SHM has an interface connection at each end, one
for DTE or DCE, and one for the telephone line
(twisted pairs). To install the SHM:
1. Connect the twisted-pair cable (customer-supplied) to
the RJ-45 female. Refer to Figure 3-1 for the
associated pin assignments.
2. When the SHM has been cabled, connect the
telephone-interface cable to the telephone outlet.

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SHM NPR/RJ-45
Figure 3-1. Pin Assignments for RJ-45 Connectors.
3. If the SHM is to be used as a DTE, set the externally
accessible DCE/DTE switch to the DTE position. If
the SHM is to be used as a DCE, set the switch to the
DCE position. (If you are uncertain as to how your
equipment operates, try each of the settings to see
which one works in your application.)
4. Plug the SHM’s interface connector end into the RS-
232C connector on the DTE or DCE and tighten the
connector mounting screws.
For examples of typical applications of the SHM with
DTE or DCE devices, refer to Figure 3-3.
PINS
FEMALE
1 2 3 4 5 6 7 8
MALE
3 (RXB) -
4 (TXB) +
5 (TXA) -
6 (RXA) +

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SHM NPR/RJ-45
Figure 3-3. Typical Short-Range Modem Applications.
Customer-Owned
Unloaded Twisted-
Pair Cable
Customer-Owned
Unloaded Twisted-
Pair Cable
Async MiniComputer Async Terminal
PC
Serial Printer
SHM NPR/RJ-45s
SHM NPR/RJ-45s

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SHM NPR/RJ-45
Appendix: RS-232 Signals
Pin Circuit Description Signal Type Direction
1 AA Protective Ground Ground
2 BA Transmitted Data Data To DCE
3 BB Receive Data Data From DCE
4 CA Request to Send Control To DCE
5 CB Clear to Send Control From DCE
6 CC Data Set Ready Control From DCE
7 AB Signal Ground Ground
8 CF Data Carrier Detect Control From DCE
9 DC Voltage
20 CD Data Terminal Ready Control To DCE
Pins 1 and 7 are tied together.
Pins 4 and 5 are tied together.
Pins 6, 8, and 20 are tied together.

1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax [phone]
© Copyright 2000. Black Box Corporation. All rights reserved.