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Black Box SM500A Manual

Black Box SM500A Manual

Automatic switching system
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January 2005
990-000-0001-E8
Automatic Switching System
SM500A
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
CUSTOMER
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-
SUPPORT
0746
INFORMATION
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com

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  • Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX CUSTOMER FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746- SUPPORT 0746 INFORMATION Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 SM500A—Automatic Switching System FEDERAL COMMUNICATIONS COMMISSION 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.
  • Page 3 SM500A—Automatic Switching System 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.
  • Page 4 SM500A—Automatic Switching System 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.

  • Page 5: Table Of Contents

    SM500A—Automatic Switching System Contents General Description........................8 Introduction..........................8 User Interfaces........................8 System Switching Functions....................8 Components..........................10 Rack Mount Chassis ......................10 Control Cards........................11 Software Applications......................14 Switching Interface Cards.....................14 System Cables........................15 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 Installation ............................19...
  • Page 6 SM500A—Automatic Switching System 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 ASCII Error Messages......................38 Control via SNMP..........................39 DIP Switch (S1) Setting......................39 SNMP Network Configuration....................39 6.2.1 Setting the IP Address and SNMP Configuration ............39 6.2.2...
  • Page 7 Switching (Individual, Gang, System Gang) ................68 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 Errors...........................71 System Specifications........................72 Automatic Switching System SM500A..................72 AC Redundant Power Supply ....................72 Black Box Corporation 990-000-0001-E8...

  • Page 8: General Description

    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 Cards with up to 32 switching channels, for a system maximum of 2048 switching channels.
  • Page 9 SM500A—Automatic Switching System 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.

  • Page 10: Components

    SM500A—Automatic Switching System 2 Components 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.

  • Page 11: Control Cards

    SM500A—Automatic Switching System 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...
  • Page 12 Connecting Power Module SM514-A-PS or SM514-A-PS-E to “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-E to “12VAC2”...
  • Page 13 SM500A—Automatic Switching System 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) Black Box Corporation 990-000-0001-E8...

  • Page 14: Software Applications

    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.

  • Page 15: System Cables

    SM500A—Automatic Switching System SM507-C AB Double Channel Coax, 75 ohm SM508-C AB RJ-11 Card SM508-C-2 Double RJ-11 Card SM509-C AB RJ-45 Cat-5 Card SM509-C-2 Double RJ-45 Cat-5 Card SM511-C AB DB-9 Card F/F SM512-C AB DB-15 (T-1) Card F/F SM518 Blank panel, 7"...

  • Page 16: Components

    SM500A—Automatic Switching System 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.

  • Page 17: Installation Procedure

    SM500A—Automatic Switching System 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.
  • Page 18 SM500A—Automatic Switching System 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.

  • Page 19: Installation

    SM500A—Automatic Switching System 3 Installation 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:...
  • Page 20 SM500A—Automatic Switching System 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-C and SM532-C) Using the bank of jumpers (figure 3.3), set up the Power Supply/Control Card to perform...
  • Page 21 SM500A—Automatic Switching System NOTE: The yellow LED, labeled “ENBL”, is illuminated to indicate that the “SYSTEM GANG” function is active. To perform any local switching functions, the key-operated switch must be in the ENABLE position. 3. Remote system gang switching via contact closure—JP1 to JP5 in position 2-3. This card has an additional capability of performing system gang switching activated by an external control voltage.
  • Page 22 Table 3.1. Switching functionality as function of Power Supply/Control Card jumper settings 4. Install Power Supply/Control Card in Chassis Install the Power Supply/Control Card in the SM500A chassis, slot 17, fastening it into place with the supplied screws (figure 2.2).
  • Page 23 AC sources. Make sure that the two POWER indicator LEDs, located on the AC Redundant Power Supply front panel, light up. Also, see that the PS1 and PS2 LEDs on the SM500A chassis front panel are illuminated. NOTE: For enhanced redundancy, the AC Redundant Power Supply may be fed from a 115VAC source at one power input and a 230VAC source at the other power input.
  • Page 24 Card SM534-C. Connect leads from the outside power source to the control card two-pin terminal strip connector, which is provided with the card (figure 3.3B). Also, verify that the PS1 LED on the SM500A chassis front panel is illuminated. Black Box Corporation...
  • Page 25 SM500A—Automatic Switching System Figure 3.3B. Connection of wires to -48V terminal block connector. Connector is provided with the control card. 7. Connect Ground Establish ground between the chassis and office ground. A frame grounding screw is located on the control card. This and all other grounding connections must be established to comply with all local and national electrical codes.
  • Page 26 SM500A—Automatic Switching System 3. Toggle the channel switches. Then toggle the Gang Switch. No switching should be performed. 4. Push the SYSTEM GANG button and toggle the GANG switch simultaneously to A or B. No switching should occur. 5. Reinsert key into the chassis and turn to the ENABLE position.
  • Page 27 SM500A—Automatic Switching System 7. Toggle the channel switches in that particular chassis. Each channel should switch to the required position, and the LEDs should provide a visual indication of the switched position. 8. Toggle the GANG switch to the A or B position. All channels within the chassis should switch to the required position.
  • Page 28 SM500A—Automatic Switching System Figure 3.5. Power Supply/Control Card pin configuration and control applications Black Box Corporation 990-000-0001-E8...

  • Page 29: User Interfaces (Using Advanced Control Cards Sm533-C And Sm534-C)

    SM500A chassis and manager. 3. Control via Web browser uses a standard browser interface for performing switch operations with the SM500A chassis. The browser shows a graphical view of the chassis and provides point and click operation. 4. Control via Advanced GUI Based Management uses proprietary software. Similar to the Web browser interface, the program provides a graphical view of the SM500A chassis and provides point and click operation.
  • Page 30 SM500A—Automatic Switching System Figure 4.1. Typical Configuration Black Box Corporation 990-000-0001-E8...

  • Page 31: Control Via Ascii

    SM500A—Automatic Switching System 5 Control via ASCII 5.1 DIP Switch (S1) Setting Control via ASCII requires setting the toggles on DIP switch S1 located on the Advanced Control Card (SM533-C or SM534-C). Figure 5.1 shows the location of DIP switch S1.

  • Page 32: Ascii Commands

    5.3 ASCII Commands This section describes the ASCII command grammar for managing the Automatic Switching System SM500A via local control (COM1 serial port on the Advanced Control Card) or via remote control/Telnet session (via Ethernet port on the Advanced Control Card).

  • Page 33: Help Set

    SM500A—Automatic Switching System GET RACK n TIME GET RACK n VERSION GET COMMANDS GET RACK n NETWORK|SNMP CONFIGURATION 5.3.3 HELP SET SET COMMANDS SET RACK n CHANNEL c COM|A|B [name] SET RACK n CHANNEL c PORT A|B SET RACK n ECHO ON|OFF...

  • Page 34: Get Rack N Channel Status

    SM500A—Automatic Switching System ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________ ________...

  • Page 35: Get Rack N Network Configuration

    SM500A—Automatic Switching System Must be in ON position Must be in OFF position DIPSW2 1-8 (Not Used) DIPSW DIPSW-1 OFF ON OFF OFF OFF OFF OFF DIPSW-2 OFF OFF OFF OFF OFF OFF OFF OFF 5.3.8 GET RACK n NETWORK CONFIGURATION Retrieves network configuration parameters.

  • Page 36: Set Rack N Channel C Com|A|B [Name]

    SM500A—Automatic Switching System PART NUMBER VERSION NUMBER 1.0 (Build 01) 981-000-00 5.3.12 SET RACK n CHANNEL c COM|A|B [name] Use this command to set a label identifier to a port (COM, A, B) on a channel c. Channels are identified by channel c (1-32).

  • Page 37: Set Rack N Ip Address X.x.x.x

    SM500A—Automatic Switching System 5.3.19 SET RACK n IP ADDRESS x.x.x.x Sets the rack IP address. Defaults to 192.168.0.1 5.3.20 SET RACK n NAME [name] Sets the identifier name for rack n. The identifier name has a maximum length of 31 characters.

  • Page 38: Set Rack N Web Pw Old New

    SM500A—Automatic Switching System The time has the hh:mm format, with 0 – 23 0 – 59 If the unit fails to set the time on the rack, a RTC error message is returned. 5.3.29 SET RACK n WEB PW old new Sets a password for the web submit pages.

  • Page 39: Control Via Snmp

    6.2.1 Setting the IP Address and SNMP Configuration Note: The IP address MUST LOCALLY be configured into the SM500A chassis in order to establish an Ethernet connection. Use the COM1 port on the Advanced Control Card for the local connection.
  • Page 40 SM500A—Automatic Switching System Figure 6.2. Local RS232 connection via COM1 on the Advanced Control Card (SM533-C) for chassis IP configuration Configure the IP address of each chassis 1. Using a terminal or terminal emulation program on a PC (HyperTerminal, for example), configure the terminal communication settings as follows.

  • Page 41: Snmp And System Gang (Optional) Connections

    SET RACK 1 SNMP MANAGER x.x.x.x Where x.x.x.x is the IP address. The chassis responds with: 1:OK 3. Choose whether or not the SM500A transmits the traps to the SNMP Manager by executing the command: SET RACK 1 SNMP TRAPS ON|OFF The chassis responds with: 1:OK 4.
  • Page 42 SM500A—Automatic Switching System Figure 6.3. Typical connection and daisy chain Gang In/Gang Out connections on the Advanced Control Card. SNMP can access every chassis in the system. Figure 6.4. Typical setup for combined SNMP and manual control using various control cards. SNMP can access only the first chassis in the system.

  • Page 43: Snmp Mib

    SM500A chassis. 6.3.2 SNMP Version and Settings The SNMP agent on the SM500A implements SNMP v1, and allows the user to access the unit using SNMP management software. The community names for the SNMP agent are defined as follows:...

  • Page 44: Rack Information

    SM500A—Automatic Switching System 6.3.3.2 Rack Information -- the rack info rack OBJECT IDENTIFIER ::= { RSS500 1 } 6.3.3.2.1 rackRTCDate rackRTCDate OBJECT-TYPE SYNTAX DisplayString (SIZE (0..10)) ACCESS read-write STATUS mandatory DESCRIPTION "The current date for the unit. The format is: MM/DD/YYYY"...

  • Page 45: Channel Information

    SM500A—Automatic Switching System "The System Gang Switch Operation. Forces all channels on the daisy-chained system (via cable connections on GANG IN/GANG OUT ports) to switch to the selected port." ::= { rack 5 } 6.3.3.3 Channel Information -- the channel info...

  • Page 46: Ch6

    SM500A—Automatic Switching System "The channel 5 status." 6.3.3.3.6 ch6 ::= { channel 5 } ch6 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write STATUS mandatory DESCRIPTION "The channel 6 status." 6.3.3.3.7 ch7 ::= { channel 6 } ch7 OBJECT-TYPE...

  • Page 47: Ch12

    SM500A—Automatic Switching System STATUS mandatory DESCRIPTION "The channel 11 status." ::= { channel 11 } 6.3.3.3.12 ch12 ch12 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write STATUS mandatory DESCRIPTION "The channel 12 status." ::= { channel 12 } 6.3.3.3.13 ch13...

  • Page 48: Ch18

    SM500A—Automatic Switching System SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write STATUS mandatory DESCRIPTION "The channel 17 status." 6.3.3.3.18 ch18 ::= { channel 17 } ch18 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write STATUS mandatory DESCRIPTION "The channel 18 status."...

  • Page 49: Ch24

    SM500A—Automatic Switching System ::= { channel 22 } ch23 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write STATUS mandatory DESCRIPTION "The channel 23 status." ::= { channel 23 } 6.3.3.3.24 ch24 ch24 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) }...

  • Page 50: Ch29

    SM500A—Automatic Switching System 6.3.3.3.29 ch29 ch29 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write STATUS mandatory DESCRIPTION "The channel 29 status." ::= { channel 29 } 6.3.3.3.30 ch30 ch30 OBJECT-TYPE SYNTAX INTEGER { NA(0), A(1), B(2) } ACCESS read-write...
  • Page 51 SM500A—Automatic Switching System ENTERPRISE RSS500 VARIABLES { rackSwitchKey } DESCRIPTION "This trap is generated when a change in status on the security switch key is detected." ::= 2 Black Box Corporation 990-000-0001-E8...

  • Page 52: Control Via Web Browser

    The embedded web server on the SM500A allows network management of the unit over a web browser. To access the SM500A, use your web browser and, set the address field on the browser to point to the configured IP address of the rack. For example, for a rack with the default IP address you would enter http://192.168.0.1...
  • Page 53 SM500A—Automatic Switching System Figure 7.2. Local RS232 connection via COM1 on the Advanced Control Card (SM533-C) for chassis IP configuration Configure the IP address of each chassis 1. Using a terminal or terminal emulation program on a PC (HyperTerminal, for example), configure the terminal communication settings as follows.

  • Page 54: Web Browser And System Gang (Optional) Connections

    SM500A—Automatic Switching System 7.2.2 Web Browser and System Gang (Optional) Connections Connect the Ethernet cable 1. Connect Ethernet cables from the Ethernet port on the Advanced Control Card from each chassis to an Ethernet hub (figure 7.3) or similar functioning network device.

  • Page 55: Status Window

    SM500A—Automatic Switching System Connect the System Gang cables (optional) This optional cable connection is applicable to system gang switching and remote system gang switching. Both of these switching functions will switch simultaneously all the chassis in a system, from the initiating chassis downward to daisy chained chassis.

  • Page 56: Switch Operation Window

    SM500A—Automatic Switching System The following information is displayed in the Home/Status window: 1. Rack name – entered name of the chassis 2. IP address – IP address of the chassis 3. Version – Current firmware version 4. Part number – Chassis part number 5.

  • Page 57: Name Window

    SM500A—Automatic Switching System Figure 7.6. Web browser interface. Switch Operation window. The following additional information is also displayed: 1. The status of the current switch positions. Highlighted. 2. The entered names of the COM, A and B ports. 3. Active slots are indicated by the slight outline of the A and B boxes.
  • Page 58 SM500A—Automatic Switching System The chassis acknowledges the operation with one of the following messages: COMPLETED Identifiers updated successfully. DENIED Denied because of an invalid password. The chassis identifier has a maximum length of 31 characters. Channel port identifiers have a maximum length of 8 characters.

  • Page 59: Control Via Advanced Gui Based Management (Sm540A)

    Automatic Switching System via PC. It runs on a local PC connected to a local area network to which the SM500A systems are connected. The software application features a PC based graphical interface with point and click operation.

  • Page 60: Setting The Ip Address

    8.2.3 Setting the IP Address Note: The IP address MUST LOCALLY be configured into the SM500A chassis in order to establish an Ethernet connection. Use the COM1 port on the Advanced Control Card for the local connection. Figure 8.1. Local RS232 connection via COM1 on the Advanced Control Card (SM533-C) for chassis...

  • Page 61: Software Application And System Gang (Optional) Connections

    SM500A—Automatic Switching System 4. Set the echo using the command, “SET RACK 1 ECHO ON”. 5. Enter the IP address for the chassis using the command “SET RACK 1 IP ADRESS x.x.x.x”, where x.x.x.x is replaced by the IP address.

  • Page 62: Primary Windows

    SM500A—Automatic Switching System Figure 8.3. Typical setup for combined manual/software control using various control cards. The Advanced GUI Based Management can access only the first chassis in the system. System gang switching can be performed on all chassis. Connect the System Gang cables (optional) This optional cable connection is applicable to system gang switching and remote system gang switching.

  • Page 63: Chassis Status Window

    SM500A—Automatic Switching System Figure 8.3. Advanced GUI Based Management, main window. 8.3.2 Chassis Status Window The chassis status window displays the A/B switch positions of the specified chassis in real time. Other displayed information includes the IP address, error log, key status, firmware version and part number.

  • Page 64: Chassis Connection Status Window

    SM500A—Automatic Switching System Figure 8.4. Advanced GUI Based Management, Status window. 8.3.3 Chassis Connection Status Window The chassis connection status window displays the connection status of all chassis that have been entered for the system. All chassis are polled approximately every 10 seconds. Green indicates a connected chassis.

  • Page 65: System Setup

    SM500A—Automatic Switching System 8.4 System Setup 8.4.1 Add/Delete/Rename Rack (Chassis) To ADD a new chassis to the system: 1. Click the ‘Add New Rack’ button in the main window. The ‘Add Rack’ window appears. 2. Enter the chassis name and its IP address in the blank fields.

  • Page 66: Name Ports

    SM500A—Automatic Switching System 8.4.2 Name Ports To NAME PORTS for a specified chassis: 1. Click the ‘Select Rack’ drop down list in the main window to select a chassis. 2. Click the ‘Name Ports’ button. The ‘Name Ports for Rack xxx’ window appears. The IP address of the chassis is also shown in the window heading.
  • Page 67 SM500A—Automatic Switching System 4. Select the checkboxes for the channels that will be included in the group. Click ‘Set All’ to select all channels. Click ‘Clear All’ to deselect all channels. 5. Click ‘OK’ when finished. 6. Repeat steps 2 through 5 to define other groups in the chassis.

  • Page 68: Connecting To Chassis (Rack)

    SM500A—Automatic Switching System Figure 8.10. Advanced GUI Based Management, Group Definition window. 8.5 Connecting to Chassis (Rack) To CONNECT to a specified chassis: 1. Click the ‘Select Rack’ drop down list in the main window to select a chassis. 2. Click the ‘Connect Rack’ button. The connection status box in the main window shows the connection status and IP address.

  • Page 69: Switching (User Defined)

    SM500A—Automatic Switching System Figure 8.11. Advanced GUI Based Management, Status window. 8.7 Switching (User Defined) 8.7.1 Defining a Group Switch To DEFINE a GROUP Switch: 1. Click the ‘Define System Switch’ button in the main window. The ‘Define System Switch’ window appears.

  • Page 70: Performing A System Switch

    SM500A—Automatic Switching System 3. In the ‘Name’ field, enter/edit the name of the system switch (up to 32 characters). 4. To select groups to add to the system switch, first select a chassis from the ‘Select Rack’ drop down list; its group names are then displayed in the bottom right box titled, ‘Group Switches For All Racks’.

  • Page 71: Errors

    SM500A—Automatic Switching System 8.8 Errors To VIEW Rack (Chassis) Errors: 1. Click from the ‘Rack Errors’ drop down list in the main window. To PURGE Rack (Chassis) Errors: 1. Click the ‘Purge Errors’ button in the main window. Black Box Corporation...

  • Page 72: System Specifications

    SM500A—Automatic Switching System 9 System Specifications 9.1 Automatic Switching System SM500A Signal Interfaces RS-232/V.24, V.35, RS-449, X.21/X.25,T1/T2, EIA-530, RJ-11, RJ-45, NTDS. Coax: BNC Protocols Transparent to all protocols Relay Specifications Relay type: latching Contact material: gold-clad silver Initial contact resistance: 50 milliohms...
  • Page 73 SM500A—Automatic Switching System Size 19” (48.62 cm) wide 3.5” (8.89 cm) high 6.25” (15.87 cm) deep Weight 11 lb (4.99 kg) (total assembly) Black Box Corporation 990-000-0001-E8...

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