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AUGUST 1993
MX880A
MX880AE
MX880A-ST
MX880AE-ST
Async/Sync Fiber Optic Multiplexor
CUSTOMER
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
SUPPORT
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
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Table of Contents
Related Manuals for Black Box MX880A
Summary of Contents for Black Box MX880A
- Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 SUPPORT Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 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.
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Page 3: Table Of Contents
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR Contents Chapter Page 1.0 Specifications ..................... 1 2.0 Introduction ....................3 2.1 Description ..................3 2.2 Applications ..................4 3.0 Configuration ..................... 6 3.1 Selecting the Number of Subchannels ..........7 3.2 Setting Synchronous Data Rates ............7 3.3 Selecting the Transmit Clock (TC) Source ........ -
Page 4: Specifications
CHAPTER 1: Specifications 1.0 Specifications Approvals — FCC Class A, DOC Class/MDC classe A Multiplexing Technique — Time division User Channels — (6); (12) with Doubler Cable (EYN356) Interface — Channel: Serial EIA RS-232C/CCITT V.24, DCE; Composite: Dual fiberoptic Protocols — On 3 or 9 channels: Asynchronous only;... - Page 5 ASYNC/SYNC FIBER OPTIC MULTIPLEXOR (8): (2) Front-mounted pushbuttons: Local Loopback, User Controls — Remote Loopback; (6) Internal: (3) Jumpers: Number of Channels, Clock Source, Connected/Disconnected Grounds; (3) Rotary Switches: Synchronous Data Rate/Asynchronous for Channels 1 through 3 Indicators — (4) Front-panel LEDS: Power, Test, Local Sync Loss, Remote Sync Loss Diagnostics —...
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Page 6: Introduction
CHAPTER 2: Introduction 2.0 Introduction 2.1 Description The Async/Sync Fiber Optic Multiplexor is a full-duplex time-division synchronous/asynchronous multiplexor that enables up to 12 terminals to be multiplexed onto a single fiberoptic channel. (The mux’s normal total of six subchannels can be increased to 12 by using channel-doubler cables, product code EYN356.) Channels 1 through 3 can be set to operate either synchron- ously or asynchronously, while the remaining three or nine channels always operate asynchronously. -
Page 7: Applications
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR Table 2-1. Performance in Various Configurations Total # of Max. # Subchannels Data Rate Distortion (%) Controls per Subchannels In Use (kbps) (Async Channels) Subchannel Sync Async Sync Async 6 minus sync 19.2 19.2 6.25 6 minus sync 19.2 38.4 12.5... - Page 8 CHAPTER 2: Introduction For installations involving clusters of terminals distributed in several locations, the Async/Sync Fiber Optic Multiplexor units may be installed in a ring-type (multipoint) arrangement, as shown below in Figure 2-2. Figure 2-2. Typical ring (multipoint) installation. On each terminal-end mux in a ring arrangement, the unconnected channels must be bypassed by shorting Pin 2 to Pin 3 of the relevant subchannels’...
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Page 9: Configuration
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR 3.0 Configuration Four setup procedures must be completed before the multiplexor can be installed and operated: selecting the number of subchannels, setting synchronous data rates, selecting the transmit clock (TC) source, and setting the ground. Refer to the board layout in Figure 3-1, below, for the location of the straps (jumpers) and switches referred to in the rest of this chapter. -
Page 10: Selecting The Number Of Subchannels
CHAPTER 3: Configuration 3.1 Selecting the Number of Subchannels 1. Unscrew the two upper-cover screws located at the back of the unit and slide the upper cover backward. 2. Locate the strap labeled “SELECT 6 OR 12 CHANNELS.” 3. For up to 6 channels with no controls, place the strap between the center pin and the one marked “6.”... -
Page 11: Setting The Ground
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR 3.4 Setting the Ground 1. With the cover still off the multiplexor, locate the strap marked “GND.” According to your requirements, set the signal ground to either be connected to or disconnected from the shielding (chassis or protective) ground. -
Page 12: Installation
CHAPTER 4: Installation 4.0 Installation 4.1 AC Power Requirements AC power is supplied to the Async/Sync Fiber Optic Multiplexor through a 5-foot (1.5-meter) cord terminated by a grounded three-wire plug; therefore, the multiplexor must be placed within five feet of a grounded AC outlet. The AC cord is fused at the rear-panel AC-power receptacle of the unit. -
Page 13: Subchannels
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR 4.3 Subchannels Six DB25 female connectors, located on the rear panel, enable the end-users to be connected to the unit. Detailed information about the signals present at these connectors is given in Table 4-1 on the next page. To operate the multiplexor with more than six channels, channel doublers are required (see Figure 4-2, below). - Page 14 CHAPTER 4: Installation Table 4-1. Pin Assignments for Subchannel Connectors CCITT Pin # Signal Name Description V.24 R5-232-C Protective Ground Chassis ground. Can be isolated from Signal Ground. Signal Ground Common signal- and DC-power-supply ground. 2 (14) Transmit Data Serial digital data input from a terminal or other source to the multiplexor.
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Page 15: Operation
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR 5.0 Operation The installation procedures covered in the previous section must be completed and checked before the multiplexor can be operated properly. 5.1 Controls and Indicators This section describes the front-panel controls and indicators (shown in Figure 5-1, below). -
Page 16: Operating Procedure
CHAPTER 5: Operation 5.2 Operating Procedure CAUTION! The protective-ground terminals of the multiplexor must be connected to the protective-ground conductor of the power cord. The mux’s power- cord plug should be inserted only in (a) an outlet provided with a protective-ground contact or (b) an extension cord with a protective- ground conductor;... - Page 17 ASYNC/SYNC FIBER OPTIC MULTIPLEXOR 5.3.2 R EMOTE OOPBACK Remote loopback sends data back from the remote receiver to the remote transmitter, which checks all local digital circuitry as well as both the local and remote analog interfaces, main channel link, and remote digital receiver section.
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Page 18: Troubleshooting
CHAPTER 6: Troubleshooting 6.0 Troubleshooting This chapter lists some problems that might occur during installation and operation of your mux, along with some possible solutions. CAUTION! These service instructions are for use by qualified personnel only. To avoid shock, do not perform any service action not listed below. 6.1 Front-Panel Indicators Don’t Light 1. -
Page 19: Remote Sync Loss Led Is On
ASYNC/SYNC FIBER OPTIC MULTIPLEXOR loopback test. If the Test LED comes ON and the Local Sync Loss LED goes OFF, go to Step 3. If this doesn’t happen, try replacing the remote unit: A) If you don’t have a replacement unit, call your supplier. B) If the system works fine with the replacement unit, the original remote unit is probably faulty. -
Page 20: Calling Your Supplier
CHAPTER 6: Troubleshooting 6.4 Calling Your Supplier If you determine that your multiplexor itself is malfunctioning, do not attempt to alter or repair the unit. Contact your supplier. Before you do, make a record of the history of the problem. Your supplier will be able to provide more efficient and accurate assistance if you have a complete description, including: •... - Page 21 NOTES...
- Page 22 © Copyright 1993. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...