Black Box SM500A User manual

Automatic Switching System
SM500A
January 2005
990-000-0001-E8
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CUSTOMER
SUPPORT
INFORMATION

SM500A—Automatic Switching System
Black Box Corporation 2990-000-0001-E8
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
B 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.

SM500A—Automatic Switching System
Black Box Corporation 3990-000-0001-E8
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.
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.

SM500A—Automatic Switching System
Black Box Corporation 4990-000-0001-E8
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.

SM500A—Automatic Switching System
Black Box Corporation 5990-000-0001-E8
Contents
1General Description........................................................................................................................8
1.1 Introduction............................................................................................................................8
1.2 User Interfaces.......................................................................................................................8
1.3 System Switching Functions...................................................................................................8
2Components..................................................................................................................................10
2.1 Rack Mount Chassis ............................................................................................................10
2.2 Control Cards.......................................................................................................................11
2.3 Software Applications...........................................................................................................14
2.4Switching Interface Cards.....................................................................................................14
2.5 System Cables.....................................................................................................................15
2.6 AC Redundant Power Supply...............................................................................................15
2.6.1 Description.............................................................................................................15
2.6.2 Components...........................................................................................................16
2.6.3 Installation Procedure.............................................................................................17
2.6.4 Maintenance...........................................................................................................17
3Installation ....................................................................................................................................19
3.1 Installation Procedure...........................................................................................................19
4User Interfaces (Using Advanced Control Cards SM533-C and SM534-C).................................29
4.1 General Description..............................................................................................................29
4.2 System Diagram...................................................................................................................29
5Control via ASCII ..........................................................................................................................31
5.1 DIP Switch (S1) Setting........................................................................................................31
5.2 ASCII Local Configuration....................................................................................................31
5.3 ASCII Commands ................................................................................................................32
5.3.1 HELP .....................................................................................................................32
5.3.2 HELP GET.............................................................................................................32
5.3.3 HELP SET..............................................................................................................33
5.3.4 GET RACK n CARDS.............................................................................................33
5.3.5 GET RACK n CHANNEL NAME .............................................................................33
5.3.6 GET RACK n CHANNEL STATUS..........................................................................34
5.3.7 GET RACK n DIPSW STATUS...............................................................................34
5.3.8 GET RACK n NETWORK CONFIGURATION.........................................................35
5.3.9 GET RACK n SNMP CONFIGURATION.................................................................35
5.3.10 GET RACK n TIME.................................................................................................35
5.3.11 GET RACK n VERSION.........................................................................................35
5.3.12 SET RACK n CHANNEL c COM|A|B [name]...........................................................36
5.3.13 SET RACK n CHANNEL c PORT A|B.....................................................................36
5.3.14 SET RACK n ECHO ON|OFF.................................................................................36
5.3.15 SET RACK n FACTORY DEFAULTS .....................................................................36
5.3.16 SET RACK n GROUP m PORT A|B .......................................................................36
5.3.17 SET RACK n GANG PORT A|B..............................................................................36
5.3.18 SET RACK n SYSGANG PORT A|B.......................................................................36
5.3.19 SET RACK n IP ADDRESS x.x.x.x .........................................................................37
5.3.20 SET RACK n NAME [name]....................................................................................37
5.3.21 SET RACK n SNMP MANAGER x.x.x.x..................................................................37
5.3.22 SET RACK n SNMP READ COMMUNITY NAME name..........................................37
5.3.23 SET RACK n SNMP WRITE COMMUNITY NAME name ........................................37
5.3.24 SET RACK n SNMP TRAPS ON|OFF.....................................................................37
5.3.25 SET RACK n SUBNET MASK x.x.x.x.....................................................................37
5.3.26 SET RACK n SYSGANG ENABLE|DISABLE..........................................................37
5.3.27 SET RACK n TELNET IDLE TIMEOUT m...............................................................37

SM500A—Automatic Switching System
Black Box Corporation 6990-000-0001-E8
5.3.28 SET RACK n TIME mm/dd/yyyy hh:mm..................................................................37
5.3.29 SET RACK n WEB PW old new..............................................................................38
5.3.30 RESET RACK n.....................................................................................................38
5.4 ASCII Error Messages..........................................................................................................38
6Control via SNMP..........................................................................................................................39
6.1 DIP Switch (S1) Setting........................................................................................................39
6.2 SNMP Network Configuration...............................................................................................39
6.2.1 Setting the IP Address and SNMP Configuration....................................................39
6.2.2 SNMP and System Gang (Optional) Connections...................................................41
6.3 SNMP MIB...........................................................................................................................43
6.3.1 Description.............................................................................................................43
6.3.2 SNMP Version and Settings ...................................................................................43
6.3.3 MIB File (RSS500.mib)...........................................................................................43
6.3.3.1 Version and Enterprise Number ..............................................................43
6.3.3.2 Rack Information.....................................................................................44
6.3.3.2.1 rackRTCDate........................................................................44
6.3.3.2.2 rackRTCTime .......................................................................44
6.3.3.2.3 rackSwitchKey......................................................................44
6.3.3.2.4 rackGangSwitch...................................................................44
6.3.3.2.5 rackSysGangSwitch..............................................................44
6.3.3.3 Channel Information................................................................................45
6.3.3.3.1 ch1.......................................................................................45
6.3.3.3.2 ch2.......................................................................................45
6.3.3.3.3 ch3.......................................................................................45
6.3.3.3.4 ch4.......................................................................................45
6.3.3.3.5 ch5.......................................................................................45
6.3.3.3.6 ch6.......................................................................................46
6.3.3.3.7 ch7.......................................................................................46
6.3.3.3.8 ch8.......................................................................................46
6.3.3.3.9 ch9.......................................................................................46
6.3.3.3.10 ch10.....................................................................................46
6.3.3.3.11 ch11.....................................................................................46
6.3.3.3.12 ch12.....................................................................................47
6.3.3.3.13 ch13.....................................................................................47
6.3.3.3.14 ch14.....................................................................................47
6.3.3.3.15 ch15.....................................................................................47
6.3.3.3.16 ch16.....................................................................................47
6.3.3.3.17 ch17.....................................................................................47
6.3.3.3.18 ch18.....................................................................................48
6.3.3.3.19 ch19.....................................................................................48
6.3.3.3.20 ch20.....................................................................................48
6.3.3.3.21 ch21.....................................................................................48
6.3.3.3.22 ch22.....................................................................................48
6.3.3.3.23 ch23.....................................................................................48
6.3.3.3.24 ch24.....................................................................................49
6.3.3.3.25 ch25.....................................................................................49
6.3.3.3.26 ch26.....................................................................................49
6.3.3.3.27 ch27.....................................................................................49
6.3.3.3.28 ch28.....................................................................................49
6.3.3.3.29 ch29.....................................................................................50
6.3.3.3.30 ch30.....................................................................................50
6.3.3.3.31 ch31.....................................................................................50
6.3.3.3.32 ch32.....................................................................................50
6.3.3.4 Traps......................................................................................................50

SM500A—Automatic Switching System
Black Box Corporation 7990-000-0001-E8
6.3.3.4.1 chStatusChange...................................................................50
6.3.3.4.2 keyStatusChange .................................................................50
7Control via Web Browser .............................................................................................................52
7.1 DIP Switch (S1) Setting........................................................................................................52
7.2 Web Browser Configuration..................................................................................................52
7.2.1 Setting the IP Address............................................................................................52
7.2.2 Web Browser and System Gang (Optional) Connections........................................54
7.3 Status Window.....................................................................................................................55
7.4 Switch Operation Window ....................................................................................................56
7.5 Name Window......................................................................................................................57
8Control via Advanced GUI Based Management (SM540A)..........................................................59
8.1 General Description..............................................................................................................59
8.2 Installation............................................................................................................................59
8.2.1 DIP Switch (S1) Setting..........................................................................................59
8.2.2 Software Installation...............................................................................................59
8.2.3 Setting the IP Address............................................................................................60
8.2.4 Software Application and System Gang (Optional) Connections .............................61
8.3 Primary Windows.................................................................................................................62
8.3.1 Main Window..........................................................................................................62
8.3.2 Chassis Status Window..........................................................................................63
8.3.3 Chassis Connection Status Window .......................................................................64
8.4 System Setup.......................................................................................................................65
8.4.1 Add/Delete/Rename Rack (Chassis).......................................................................65
8.4.2 Name Ports............................................................................................................66
8.4.3 Define Groups........................................................................................................66
8.5 Connecting to Chassis (Rack) ..............................................................................................68
8.6 Switching (Individual, Gang, System Gang) ..........................................................................68
8.7 Switching (User Defined)......................................................................................................69
8.7.1 Defining a Group Switch.........................................................................................69
8.7.2 Defining a System Switch.......................................................................................69
8.7.3 Performing a System Switch...................................................................................70
8.8 Errors...................................................................................................................................71
9System Specifications..................................................................................................................72
9.1 Automatic Switching System SM500A..................................................................................72
9.2 AC Redundant Power Supply...............................................................................................72

SM500A—Automatic Switching System
Black Box Corporation 8990-000-0001-E8
1General Description
1.1 Introduction
The Automatic Switching System SM500A provides an efficient, reliable means of switching
different interfaces between “active” and “fallback” positions.
The SM500A can perform switching at the channel, chassis, or system level. At the system
level,up to 64 chassis can be ganged together. Each chassis accommodates one Power
Supply/Control Card or Advanced Control Card and up to 16 Switching Interface Cardswith
up to 32 switching channels, for a system maximum of 2048 switching channels.
Switching Interface Cardsare transparent to all communication formats and speeds. For
switching,they use magnetic latching relays, which remain in the last switched position in the
event of power loss. A wide variety of Switching Interface Cards—RS-232/V.24, EIA-530,
Coax, RJ-11, RJ-45, V.35, and others—can be mixed within the same chassis, affording
maximum flexibility to the user.
For additional reliability, two Power Modules (SM514-A-PS or SM514-A-PS-E) per chassis
or an AC Redundant Power Supply (SM535A)may be used with the Automatic Switching
System SM500A. The SM500A also has options to operate with -48VDC.
1.2 User Interfaces
This documentation describes five types of control for the SM500A Automatic Switching
System—control via manual switching, SNMP protocol, ASCII commands, Web browser and
GUI based software. For manual control, the following Power Supply/Control Cards may be
used: SM531 C (12VAC) or SM532 C (-48VDC). For SNMP, ASCII, Web browser or GUI
based software, the following Advanced Control Cards may be used: SM533 C (12VAC) or
SM534 C (-48VDC).
1.3 System Switching Functions
The Automatic Switching System SM500A provides the following switching functions:
Individual card switching—this function applies only to a single channel and is triggered by
the toggle switch located on the front of the corresponding Switching Interface Card. For
cards with double channels, two toggle switches (one per channel) are available. The two
toggle switches may be connected in parallel (via jumper selection) to perform simultaneous
switching of the two channels, if required. The switching is enabled/disabled by turning the
key-activated switch on the chassis front panel.
Group gang switching—this function applies to a selected group of Switching Interface
Cards that simultaneously switch within one chassis. The group is defined by assigning a
number (via jumper selection) to each card in the group. Up to four groups may be defined.
Switching of the group is performed by any one of the toggle switches of the cards that
belong to the group. The switching is enabled/disabled by turning the key-activated switch on
the chassis front panel.
Chassis gang switching—this function simultaneously switches all Switching Interface
Cards within one chassis. It is performed by toggling the GANG switch located on the chassis
front panel. GANG switching is enabled/disabled by turning the key-activated switch on the
chassis front panel.

SM500A—Automatic Switching System
Black Box Corporation 9990-000-0001-E8
System gang switching—this function switches simultaneously all the chassis in a system
and is enabled via jumpers on the Power Supply/Control Card.It is performed by toggling the
GANG switch while pressing the SYSTEM GANG button on the chassis front panel. System
gang switching can be initiated from multiple chassis and is enabled/disabled by turning the
key-activated switch on the front panel of the chassis that is initiating the switching. The
key-operated switch positions on the remaining interconnected chassis are disregarded.
Remote system gang switching—this switching function is initiated from a contact closure
applied to the CONTACT CLOSURE SWITCHING connector located on the Power
Supply/Control Card or Advanced Control Card. It will simultaneously switch an entire
system. This function is independent of the key-activated switch position on the front panel of
all chassis.

SM500A—Automatic Switching System
Black Box Corporation 10 990-000-0001-E8
2Components
A standard Automatic Switching System SM500A consists of a Rack Mount Chassis, a
Power Supply/Control Card or Advanced Control Card, one or two Power Modules, and
selected Switching Interface Cards.
2.1 Rack Mount Chassis
The Rack Mount Chassis has 17 slots numbered 1 through 17 (refer to figure 2.2). A Power
Supply/Control Card or Advanced Control Card must be inserted into slot 17. Up to 16
Switching Interface Cardsmay be inserted into slots 1 through 16.
Model Description
SM500A Rack Mount Chassis with 17 slots—16 slots for Switching Interface Cards,
one slot for Power Supply/Control Card or Advanced Control Card. A
key-operated switch on the front panel enables/disables all local switching
functions. Two LEDs (PS1 and PS2) indicate power-on condition. If a Power
Module (SM514-A-PS or SM514-A-PS-E) is connected, PS1 will illuminate. If
an AC Redundant Power Supply (SM535A) or second Power Module is
connected, PS1 and PS2 will illuminate. If an outside voltage source,
-48VDC, is connected, PS1 will illuminate.
Figure 2.1. Front view of SM500A chassis.

SM500A—Automatic Switching System
Black Box Corporation 11 990-000-0001-E8
Figure 2.2. Rear view of SM500A chassis with cards inserted. Cards will vary according to application.
Slots 1-16 reserved for Switching Interface Cards. Slot 17 reserved for Power Supply/Control Card or
Advanced Control Card.
2.2 Control Cards
A Power Supply/Control Card or Advanced Control Card (figure 2.3) must be inserted into
slot 17 of the SM500A chassis. This card provides power and control to one chassis. Two
types of cards are available—one using 12VAC that can be also used with one or two Power
Modules if power redundancy is required or with the AC Redundant Power Supply; the other
type is used with -48VDC.
Model Description
SM531-CPower Supply/Control Card, 12VAC. Three types of control configuration are
available for this card, depending on one of the following applications in
which the SM500A chassis is used:
1. Chassis gang switching.A toggle switch on the SM500A chassis front
panel, labeled “GANG”, provides the capability to perform gang switching on
chassis level. To perform local switching functions, the key-operated switch
on the chassis must be in the ENABLE position.
2. System gang switching.By pressing and holding the “SYSTEM GANG”
pushbutton while toggling the “GANG” switch, switching is extended to the
entire system. All Power Supply/Control Cards must be interconnected via
RJ-11 cables using “GANG IN/GANG OUT” ports to perform system gang
switching. To perform local switching functions, the key-operated switch on
the initiating chassis must be in the ENABLE position. This overrides the
key-operated switch positions on the remaining interconnected chassis.

SM500A—Automatic Switching System
Black Box Corporation 12 990-000-0001-E8
3. Remote system gang switching via contact closure. This card has an
additional capability of performing system gang switching activated by an
external control voltage. This functionality is available through the
“CONTACT CLOSURE SWITCHING” port. The controlling voltage can be
supplied from an RS232 control lead or any other source switched between
+12V and -12Vor from an external relay or switch contact using +12Vand
-12Vavailable at the “CONTACT CLOSURE SWITCHING” connector
through a 1K ohm resistor. Switching to “A” requires +12V. Switching to “B”
requires -12V. For setup, refer to the installation procedures. This function is
independent of the key-operated switch position. This function can be
extended to the entire system by interconnecting all the Power
Supply/Control Cards using RJ-11 cables at the “GANG IN/GANG OUT”
ports. System gang switching is available as described in item2.
NOTE:The position of the key-activated switch on the chassis front panel affects only
local switching. The position is disregarded for all remote switching. Interconnected
chassis will follow the key position of the chassis that is initiating the local switching.
Connecting Power Module SM514-A-PS or SM514-A-PS-Eto “12VAC1”
connector will power the SM500A chassis and illuminate the PS1 LED on the
chassis front panel.
Connecting Power Module SM514-A-PS or SM514-A-PS-Eto “12VAC2”
connector will power the SM500A chassis and illuminate the PS2 LED on the
chassis front panel.
If power redundancy is needed, two Power Modules can be connected or the
AC Redundant Power Supply (SM537) can be used.
SM532-CPower Supply/Control Card, -48VDC. Same as SM531-C, but powered from
an external -48VDC using the “-48VDC” connector. The PS1 LED on
SM500A chassis front panel is illuminated when card is powered.
SM533-CAdvanced Control Card, 12VAC. Provides local control as SM531-Cwith
addition of SNMP, Telnet, Web browser and RS-232 control. A GUI based
software (SM540A) can be also used with the Advanced Control Card.
Note that the COM1 port is a DCE configuration. Pin 2 is TDX, pin 3 is RDX,
pin 5 is SIG GND. All other pins are not used. COM2 port is not used.
SM534-CAdvanced Control Card, -48 VDC. Same as SM533-C, except for -48VDC.
NOTE: Control Cards SM532-Cand SM534-Care protected from overload by an internal
fuse.
Figure 2.2a. Pin assignments for COM1 (DB9 female)

SM500A—Automatic Switching System
Black Box Corporation 13 990-000-0001-E8
Figure 2.3. From left to right, Power Supply/Control Cards SM531-C(12VAC) and SM532-C
(-48VDC)
Figure 2.3a. From left to right, Advanced Control Cards SM533-C(12VAC) and SM534-C(-48VDC)

SM500A—Automatic Switching System
Black Box Corporation 14 990-000-0001-E8
Model Description
SM514-A-PS Power Module 115VAC/12VAC. Used for 115VAC application. Provides
power to a fully loaded SM500A chassis. For applications where redundant
power is required, the use of two Power Modules is needed.
SM514-A-PS-EPower Module 230VAC/12VAC. Used for 230VAC application. Provides
power to a fully loaded SM500A chassis. For applications where redundant
power is required, the use of two Power Modules is needed.
SM535A AC Redundant Power Supply. rack mount unit 19” (48.26 cm) wide, 3.5”
(8.89 cm) high, 6.25” (15.87 cm) deep. Provides redundant power to up to
eight SM500A fully loaded chassis. It has two main power feeds that can be
connected to 115VAC or 230VAC.
Figure 2.4. Left to right, Power Module SM514-A-PS/SM514-A-PS-Eand AC Redundant Power
Supply SM535A (front view)
2.3 Software Applications
Provides a user interface to enable remote operations on one or multiple chassis in an
Automatic Switching System.
Model Description
SM540A GUI based management software application for PC. Requires Advanced
Control Cards SM533-Cor SM534-C.
2.4 Switching Interface Cards
Model Description
SM501-CAB V.35 21-Conductor Card F/F. Switches 19 conductors: A and B are
common, C, D, E, F, H, J, K, L, P, R, S, T, U, V, W, X, AA, BB are switched.
SM503-CAB RS-232/V.24/EIA-530 DB-25. 25-Conductor Card F/F. Switches 25
conductors. A, B, and Common: female.
SM503-C-FM AB RS-232/V.24/EIA-530 DB-25. 25-Conductor Card, F/M. Switches 25
conductors. A and B: female; Common: male.
SM504-CAB Coax BNC Card, 75 ohm

SM500A—Automatic Switching System
Black Box Corporation 15 990-000-0001-E8
SM507-CAB Double Channel Coax, 75 ohm
SM508-CAB RJ-11 Card
SM508-C-2Double RJ-11 Card
SM509-CAB RJ-45 Cat-5 Card
SM509-C-2Double RJ-45 Cat-5 Card
SM511-CAB DB-9 Card F/F
SM512-CAB DB-15 (T-1) Card F/F
SM518 Blank panel, 7" high
Figure 2.5. Switching Interface Cards
2.5 System Cables
Model Description
EL04M-04 Interconnecting cable for system gang switching, RJ-11 type, 3 ft
EL04M-14 Interconnecting cable for system gang switching, RJ-11 type, 15 ft
2.6 AC Redundant Power Supply
2.6.1 Description
The AC Redundant Power Supply is composed of two plug-in Power Supply Units, normally
operating in a “load-sharing” mode but each capable of operating independently. It can
provide power for up to eight fully loaded chassis and replaces the Power Module (wall unit),
(SM514-A-PS, SM514-A-PS-E)in each of the eight chassis.
Each plug-in Power Supply Unit has its own voltage selection switch (115/230VAC), fuses,
and AC supply input. Connecting each Power Supply Unit to a different power line improves

SM500A—Automatic Switching System
Black Box Corporation 16 990-000-0001-E8
reliability of the connected systems. There is a POWER LED on the front panel of each unit.
Refer to Figure 2.6.
The AC Redundant Power Supply has eight output connectors on the rear panel to provide
power to the selected chassis. Eight 6-foot supply cables (SM539)are provided with each unit
for connection to the chassis. Refer to Figure 2.7.
2.6.2 Components
The AC Redundant Power Supply SM535A assembly consists of the following components:
Qty Model Description
1SM538A Rack Mount Chassis
2SM537 Plug-in Power Supply Unit
2EPWR08 Six-foot AC Cord
8SM539 Eight-foot Interconnecting Low Voltage Power Cable
Figure 2.6. AC Redundant Power Supply unit (SM535A) front panel.

SM500A—Automatic Switching System
Black Box Corporation 17 990-000-0001-E8
Figure 2.7. AC Redundant Power Supply unit (SM535A) rear panel
2.6.3 Installation Procedure
Mount the Chassis (SM535A), in the communication cabinet.
1. Check the slide switches located on the rear panel of each Power Supply Unit for proper
AC voltage selection—that is, 115 V (factory set) or 230 V. This procedure must be followed
to avoid damage to the Power Supply Unit.
2. Connect the two AC cords to the RS500 chassis. Verify that the two power indicator
LEDs are illuminated.
3. Connect up to eight supply cables (SM539)from the rear connectors on the AC
Redundant Power Supply chassis labeled SYS 1, . . . , SYS 8 to the corresponding chassis.
CAUTION BEFORE POWERING THE AC REDUNDANT POWER SUPPLY UNIT:
The AC Redundant Power Supply unit is factory set to 115VAC at both power inputs. For
230VAC operation, move the desired slide switch to the 230VAC setting and replace the fuses
with the ones supplied for use with 230VAC (.8A SB 230VAC).
2.6.4 Maintenance
No preventive or routine maintenance is required for the AC Redundant Power Supply. An
LED will indicate when one of the plug-in Power Supply Units is not functioning and
replacement is therefore necessary.
To replace plug-in Power Supply Unit (SM537):
1. Unplug the AC cord from power source.
2. Unscrew captive screws and remove the plug-in Power Supply Unit.

SM500A—Automatic Switching System
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3. Slide in replacement unit and tighten the screws.
4. Connect the AC cord to the power source.
5. Check the POWER indicator LEDs on the front panel. The LED for each power unit
should be on.

SM500A—Automatic Switching System
Black Box Corporation 19 990-000-0001-E8
3Installation
CAUTION: Electrostatic Discharge (ESD): Cards are ESD-sensitive. To prevent ESD
damage, always wear grounding wrist straps when touching, removing, or inserting cards.
Store and transport cards in sealed, static-shielding bags.
3.1 Installation Procedure
1. Before installation, jumpers on Switching Interface Cards must be set:
Prepare cards for group switching and double channel individual gang switching:
To set up a group of cards to switch simultaneously within one chassis, all participating
cards must be assigned a unique group jumper number, either GROUP 1, 2, 3 or 4 (figure
3.1). Each card can participate only in one group. Up to four groups per chassis are
available. For cards with double channels, two sets of group jumpers are available, one
for each channel. Cards that do not participate in any groups must be set to NEUTRAL
(default position).
To provide simultaneous switching between the two channels within a double channel
card, set the jumper from INDIVIDUAL (default) to GANG position (figure 3.2). Either
of the two toggle switches will trigger this switching.
Figure 3.1. Jumpers on Switching Interface Cards, Single Channel

SM500A—Automatic Switching System
Black Box Corporation 20 990-000-0001-E8
Figure 3.2. Jumpers on Switching Interface Cards, Double Channel
2. Install Switching Interface Cards in Chassis(s):
Install the Interface Cards into the chassis, slots 1-16, fastening each card into place with
the supplied screws (figure 2.2).
3. Power Supply/Control Card setup (applicable to SM531-Cand SM532-C)
Using the bank of jumpers (figure 3.3), set up the Power Supply/Control Card to perform
one of the following three types of control:
1. Chassis gang switch control—JP1 to JP5 in position 1-2. The “GANG” toggle switch
provides the capability to perform gang switching on chassis level.
NOTE: To perform any local switching functions, the key-operated switch must be in the
ENABLE position.
2. Chassis and system gang switching—JP1 to JP3 in position 1-2, JP4 to JP5 in
position 2-3. While pressing and holding “SYSTEM GANG” pushbutton and then
toggling the “GANG” switch, switching is extended to the entire system. All the Power
Supply/Control Cards must be interconnected using RJ-11 cables at the “GANG
IN/GANG OUT” ports to perform system gang switching.