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MARCH 1997
MX515A
MX515AE
Local Mux-6
R L B
L L B
L O S S
S Y N C
O T E
R E M
A L
L O C
T E S T
E R
P O W
CUSTOMER
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
SUPPORT
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
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Table of Contents
Related Manuals for Black Box Local Mux-6
Summary of Contents for Black Box Local Mux-6
- Page 1 Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) SUPPORT FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 LOCAL MUX-6 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 LOCAL MUX-6 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 LOCAL MUX-6 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...
- Page 5 LOCAL MUX-6 TRADEMARKS All applied-for and registered trademarks are the property of their respective owners.
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Page 6: Table Of Contents
LOCAL MUX-6 Contents 1. Specifications .........8 1.1 Sub-Channel . -
Page 7: Specifications
LOCAL MUX-6 1. Specifications 1.1 Sub-Channels Transmission Format—Asynchronous Data Rate—Up to 19.2 kbps (refer to Table 2-1) Distortion—Refer to Table 2-1 Interface—EIA RS-232-C/CCITT V.24 Connectors—(6) DB25 female Number of Sub-channels—Up to twelve by attaching a channel doubler to each of the connectors Mode of Operation—Full duplex... -
Page 8: General
LOCAL MUX-6 1.3 General Diagnostics Local digital loopback—Activated by pushbutton. Remote digital loopback—Activated by pushbutton. Switches/Indicators Power Indicator (Green)—On when unit is powered. Test Indicator (Yellow)—On when local or remote unit is performing a loopback. Local Sync Loss Indicator (Red)—On when synchronization is lost at local unit. -
Page 9: Introduction
2.2 Functional Description The Local Mux-6 contains six sub-channels that can be expanded to twelve through connection of channel-doubler cables. The number of channels available (6/12) is set by a user-selectable strap. -
Page 10: Applications
19.2 25.0 2.3 Applications The Local Mux-6 is used mainly for point-to-point configurations where distances of up to several kilometers are involved. A typical application is demonstrated in Figure 2-1, where a cluster of terminals is connected to a host computer through a single link. Different configurations are available using the 4-wire transmission media. - Page 11 Figure 2-1. Typical Point-to-Point Installation. For installations involving clusters of terminals distributed in several locations, Local Mux-6 units may be installed in a ring-type configuration (refer to Figure 2-2). At each site the unconnected channels must be bypassed by shorting Pins 2 and 3 of the relevant sub-channel connector.
- Page 12 LOCAL MUX-6 Table 2-2. Distortion. Data Rate Distortion Number of on Each per Node Nodes/Sites Sub-Channel 19.2 kbps 25.00 9.6 kbps 12.50 4.8 kbps 6.250 2.4 kbps 3.125 1.2 kbps 1.5625 TERM 2 WIRE HOST 2 WIRE 2 WIRE TERM...
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Page 13: Installation
LOCAL MUX-6 3. Installation 3.1 Site Preparation The Local Mux-6 must be installed within 5 feet (1.5 m) of a grounded AC outlet. 3.2 Setup 1. Unscrew the two upper cover screws located at the back of the unit (refer to Figure 3-3). -
Page 14: Installation In 19" Racks
3.3 Installation in 19” Racks 3.3.1 G ENERAL The Local Mux-6 can be installed in a 19" rack. Its height is slightly less than 1U (1.75"), and the width is slightly less than the available mounting width. WARNING Disconnect the units from mains power while performing the following procedures. -
Page 15: Electrical Installation
3.4.1 AC P OWER AC power is supplied to the Local Mux-6 through a 5 feet (1.5 m) cord terminated by a grounded 3-wire plug. The AC cord is fused at the rear panel AC power receptacle of the unit. A slow-blow fuse of 0.1A is required for 230V operation, and a 0.2A fuse is required for 115V operation. -
Page 16: Main Channel
LOCAL MUX-6 3.4.3 M HANNEL A 5-screw terminal block is located at the rear panel, marked TX-A, TX-B, CHASSIS GND, RX-A, RX-B for connecting transmit and receive wires and the cable shield (if available). TX connectors at the local unit must be connected to RX connectors at the opposite unit. - Page 17 Common signal and DC power-supply ground. 2 (14) Transmit Data Serial digital data from a terminal or other source into the Local Mux-6. 3 (16) Receive Data Serial digital data output from the Local Mux-6. 4 (19) Request to Send...
- Page 18 Clear to Send (CTS) Data Set Ready (DSR) Received Line Signal Detector Not used Signal Ground Port B Secondary TD Secondary RD Secondary RTS Secondary CTS Secondary DSR Secondary RLSD Not used Figure 3-4. Connecting Channel Doubler to Local Mux-6 Sub-Channel.
- Page 19 LOCAL MUX-6 Local Mux-6 Sub-Channel Special Connector Cable 1 Channel Doubler Protective Ground Transmitted Data (TD) Received Data (RD) Request to Send (RTS) Clear to Send (CTS) Data Set Ready (DSR) Received Line Signal Detector Signal Ground Secondary TD Secondary RD Figure 3-5.
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Page 20: Operating Instructions
Local Mux-6. 4.2 Controls and Indicators Tables 4-1 and 4-2 list the function of the Local Mux-6 indicators and switches. The Local Mux-6 front panel is shown in Figure 4-1. Figure 4-1. Local Mux-6 Front Panel. - Page 21 LOCAL MUX-6 Table 4-1. Local Mux-6 Indicators. Item Indicator Function Power Green LED lights when power is present. Test Yellow LED lights when either local or remote unit is performing a test. Local Sync Loss Red LED lights when synchronization is lost at the local unit.
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Page 22: Operating Procedure
The Local Mux-6 operates entirely unattended except when performing system tests. Turning Off the Power To turn off Local Mux-6, simply remove the AC power cord from the AC source. Operational Field Strapping Changes If you need to reconfigure the Local Mux-6 for twelve-channel mode or six-channel mode, follow the appropriate set-up procedure described in Section 3-2. -
Page 23: System Tests
LOCAL MUX-6 4.4 System Tests Two system tests are available in the Local Mux-6: local loopback and remote loopback. Local Loopback When performing local loopback, the data from the local transmitter is looped back to the local receiver at the digital level, thus checking all local digital circuitry for proper operation. -
Page 24: Fault Isolation Annd Troubleshooting
LOCAL MUX-6 4.5 Fault Isolation and Troubleshooting The symptoms and corresponding procedures listed in Table 4-3 enable the user to identify, isolate, and correct faults in accordance with the knowledgeable tools and replacement parts available. WARNING These service instructions are for use by qualified personnel only. - Page 25 © Copyright 1997. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...