Black Box SW111A 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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FEBRUARY 2000
SW111A
SW111AE
SW112A
SW112AE
SW115A
SW115AE
SW116A
SW116AE
Fallback Switch
(RS-232, V.35, or RS-530)
Loopback Switch (RS-232)
RS-232 FALLBACK SWITCH II
AB
SD RD RTS DCD DTR
RS-232 LOOPBACK SWITCH
PWR LB
SD RD RTS DCD DTR

1
FCC INFORMATION
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.
The Fallback Switch and the Loopback Switch are CE certified.

2
FALLBACK SWITCH AND LOOPBACK SWITCH
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 parato 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.

3
NOM STATEMENT
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
FALLBACK SWITCH AND LOOPBACK SWITCH
TRADEMARKS
All trademarks mentioned in this manual are acknowledged to be the property of
the trademark owners.
CONTENTS
1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Switch Capability Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Switches and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Alarming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.6 “Smart” Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.7 Manual Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.8 In-Band Switching. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Power Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Disconnect Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.4 Connecting the ASCII Control Terminal . . . . . . . . . . . . . . . . . . . . 11
3.5 Connecting User Cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1 Switches 1, 2, and 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2 Switch 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.3 Switches 5 and 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Switches 7 and 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. Console Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.1 Terminal Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Main Command Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

5
CHAPTER 1: Specifications
1. Specifications
Interface—SW111A(E), SW112A(E): RS-232; SW115A(E): V.35;
SW116A(E): RS-530
Connectors—All: (1) 8-pin RJ-45; RS-232 and RS-530: (3) DB25 female;
V.35: (3) M/34 female
Leads Supported—1 through 25
Maximum Data Rate—Depends upon cabling
Switches—(1) 2-position mode selector
Indicators—All models: (1) SD, (1) RD, (1) CD, (1) DTR, (1) RTS; SW111A(E),
SW112A(E), SW116A(E): (1) pushbutton for A/B; SW115A(E): (1) pushbutton
for Loop/Normal
CE Approval—Yes
Energy Rate—6 VA
Receptacle—3-prong grounding
Power—A models: 100-120 V, 60 Hz; AE models: 200-240 V, 50 Hz
Size—1.6"H x 8.4"W x 10.8"D (4.1 x 21.3 x 27.4 cm)
Weight—4.8 lb. (2.2 kg)

6
FALLBACK SWITCH AND LOOPBACK SWITCH
2. Description
2.1 Introduction
The Fallback Switch is a standalone remotely controllable A/B switch for EIA
RS-232/V.24, V.35, or RS-530/422 circuits. You can switch via console command,
manual pushbutton, or automatically upon alarm. The Loopback Switch (SW112A
or SW112AE) is identical to the RS-232 Fallback Switch (SW111A or SW111AE)
except that the “B” switch connector has been replaced by an internal loopback
plug.
Both Switches include control-interface firmware that functions as the logical
bridge between a management console (any ASCII terminal) and the Fallback or
Loopback Switch module. The console connects to the Switch via 4-wire modular
cabling.
2.2 Switch Capability Summary
From the console, you can:
1. Determine A/B switch status of any interface.
2. Define alarms per interface.
3. Switch the circuit (Fallback Switch) or invoke loopback (Loopback Switch).
4. Configure autoswitch on alarm.
5. Disable front-panel control.
6. Establish or change the password (optional).
7. Access the HELP screen for all functions.
8. Access or set time and date.
You can also control address selection and A/B switching pushbutton control
manually at each Switch.

7
CHAPTER 2: Description
2.3 Connectors
Located on the rear of the Fallback Switch are three user data connectors
(“common,” “A,” and “B”) and one 8-pin modular jack for console control. The
user data connectors are DB25 female for RS-232 or RS-530, or M/34 female for
V.35.
The RS-232 Loopback Switch is identical to the RS-232 Fallback Switch, except
that it has an internal loopback plug instead of a “B” switch connector.
2.4 Switches and Indicators
A pushbutton is used to manually set the Fallback Switch to the desired position
(A or B). To prevent accidental switching, you must push the button and hold it
for several seconds for switching to take effect. An LED indicates the current
Fallback Switch position (regardless of whether you switch with the button or from
the console).
A pushbutton manually sets the Loopback Switch to the desired position (loop
or normal). To prevent accidental switching, you must push the button and hold it
for several seconds for switching to take effect. An LED lights when the Loopback
Switch has been set to loop back. The Loopback Switch will automatically switch to
normal upon power-up.
In both cases, five LEDs indicate lead status activity. For RS-232 switching, the
monitored leads are SD, RD, DCD, DTR, and RTS.
2.5 Alarming
The Fallback Switch supports console-controlled data circuit alarming on both the
“A” connector and the “B” connector (independent of switch position), while the
Loopback Switch supports alarming only on the “A” side. Each data line can be
programmed, through the console, to alarm on the following interface leads:
• SD, Send Data, present/absent
• RD, Receive Data, present/absent
• SCT, Serial Clock Transmit, present/absent
• SCR, Serial Clock Receive, present/absent
• RTS, Request to Send, high/low
• CTS, Clear to Send, high/low

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FALLBACK SWITCH AND LOOPBACK SWITCH
• DCD, Data Carrier Detect, high/low
• DTR, Data Terminal Ready, high/low
The alarming can be used to alert the operator and, optionally, to automatically
switch to a backup link (Fallback Switch) or to a loopback or normal condition
(Loopback Switch). For example, loss of Carrier Detect on a Fallback Switch “A”
connector can trigger automatic switching to the “B” side, and return of Carrier
Detect on “A” can trigger automatic switching back to “A.”
In order for an alarm to be reported to the console, the condition causing the
alarm must be present for a user-definable period of time, the “Time to Alarm.”
After an alarm has been reported to the console, the clearing of that alarm is also
reported. The “clear” report is issued after the original alarm condition has been
clear for a user-definable period of time, the “Time to Clear.”
2.6 “Smart” Switching
The control firmware accepts switching commands from the console and relays
these commands to the Switch within the switch housing.
When switching has automatically occurred as a result of an alarm, the “Time to
Clear” becomes functionally a “Time to Ignore” (although the console
nomenclature does not change). This “Ignore” function takes effect immediately
upon initial alarm detection and switching. The alarm for the time in question is
artificially cleared (regardless of its actual status) and, for the “Time to Clear”
duration, all activity on that line is ignored. If any alarm conditions are present
when the timer times out, they are treated as if they had just occurred (and the
“Time to Alarm” begins its function).
2.7 Manual Switching
A front-panel push button lets you manually toggle the Fallback Switch between
the
“A” position and the “B” position. To prevent accidental switching, you must press
the button for several seconds to enable the switching.
A front-panel push button lets you manually toggle the Loopback Switch between
the “normal” position and the “loopback” position. To prevent inadvertent operation,
you must press the button for several seconds to enable the switching.