Telecast Diamondback User manual

Telecast Fiber Systems, Inc.
102 Grove Street
Worcester, MA 01605
Tel: [phone]
Fax: [phone]
www.telecast-fiber.com
Diamondback™
8 Channel Video Multiplexer
Instruction Manual

Diamondback™
ii
DiamondBack Receiver and Transmitter Front
DiamondBack Receiver and Transmitter Rear

Telecast Fiber Systems
List of Figures
List of Tables
Table of Contents
Laser Safety iv
FCC Part A Manual Notice iv
Warning CE iv
Introduction 1
Setup 1
Packing List 1
Attaching the Rack Mount Adapters 2
Line Power 2
Configuring Signal I/O 3
Rear Panel Connections 3
Front Panel Indicators and Control 3
System Example 4
Fiber Optic Cable Runs 5
Making the Fiber Connection 6
Optical Transmitter Losses 6
Power Switch 7
System Block Diagrams 7
Battery Pack 9
Repair 9
Accessory List 9
Troubleshooting 10
Specifications 11
Warranty 12
iii
Figure 1. Installing the Rack Mount Adapters 2
Figure 2. Diamondback Rear Panel 3
Figure 3. Front Panels, RX (Upper) and TX (Lower) 3
Figure 4. Example of the DiamondBack/Adder 161 5
Figure 5. TX Block Diagram 8
Figure 6. TX Input Schematic 8
Figure 7. RX Block Diagram 9
Figure 8. RX Output Schematic 9
Table 1. Power Input Pin-outs 2
Table 2. Optical Loss Margin 7
Table 3. Troubleshooting Chart 11

Diamondback™
iv
Laser Safety
FCC Part A Manual Notice
Warning CE
Class 1 Laser. Do not stare into a connector port or fiber.
Laser Radiation
The unit is a CDRH Class 1 laser device. Although this means it is eye safe, you must
avoid looking directly at, or staring into, the laser beam located on an ST connector or
on the end of a fiber.
Infrared radiation is produced at the fiber connection port on the rear of the unit and at
the end of unterminated optical fibers that are attached to this port. Avoid long, direct
exposure to the light that comes from these sources.
Do not power up the unit when there is no fiber attached to the fiber connection port.
There are no user adjustments inside the Diamondback. Do not attempt any type of
service to this instrument other than so instructed in this manual. Refer servicing to
Telecast Fiber Systems, Inc.
Warning!
This equipment has been tested and found to comply with the limits for a Class A
digital device, pursuant to part 15 of the FCC rules. These limits are designed to
provide reasonable protection against harmful interference when the equipment is
operated in a commercial environment. This equipment generates, uses and can
radiate radio frequency (RF) energy and, if not installed and used in accordance with
the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference
in which case the user will be required to correct the interference at his own expense.
This is a Class A product. In a domestic environment this product may cause radio
interference.

Telecast Fiber Systems
Introduction
1
The Telecast DiamondBack™ system consists of a single or dual optical output fiber
optic transmitter/multiplexer (TX) and a mating receiver/demultiplexer (RX). The TX
unit multiplexes and launches simultaneously on the fiber up to eight channels
consisting of video inputs and/or data signals. The data signals can be the coaxial
output of the Telecast Adder™ 161 orAdder™ 882i. In this way, the Diamondback
can transmit a mix of video, audio and intercom on one singlmode fiber. Configuration
diagrams are featured on page 5.
Within a DiamondBack TX, the video signals are first digitized at 147 MHz and then
multiplexed at a data clock rate of 1.47 Gb/s. This digital data is converted to an optical
signal and launched into the fiber. The DiamondBack RX receives the optical
transmission and restores the video and data signals to the corresponding outputs.
The DiamondBack TX is optionally equipped with two parallel laser outputs for
redundancy or split feeds. In redundant operation, the DiamondBack RX accepts two
optical inputs, with automatic switchover protection.
DiamondBack electrical signal I/O channels are individually configured for video or
data use by a toggle switch on the rear panel adjacent to the input BNC on the TX and
its corresponding BNC output on the RX. The TX and RX units have similar
appearances; front and rear views are shown in Figures 3 and 4. Front panel indicators
for channel and system status are very similar, and the locations of the electrical I/O
connections on the rear panels are identical.
A rotary switch and BNC output on both TX and RX front panels enables the selection
of one of the eight video signal channels for display on a local monitor.
An internal Ni-Cad battery provides backup in the event of line power loss.
DiamondBacks are housed in a standard 19 inch electronics rack.
Setup
Packing List
The DiamondBack system consists of:
• One DiamondBack TX Transmitter
• One DiamondBack RX Receiver
• Two external power supplies (AC/DC adapters)
• Rack mount adapter kits
After unpacking, inspect the units for mechanical damage, and all electrical connectors
for bent or damaged pins and latches. Report any damage to the carrier and to
Telecast Fiber Systems, Inc. Leave the protective caps on the optical connectors until it
is time to attach the fiber. Replace the caps whenever the fiber is disconnected.

Diamondback™
2
Attaching the Rack Mount Adapters
Units are shipped ready for bench use. To mount a unit in an electronics rack, the
adapters must be attached. Each adapter is held in place by two #10 flat head screws;
see Figure 1.
Figure 1. Installing the Rack Mount Adapters
Note: Place each unit in its intended location before attaching any cables or wires to
prevent accidental damage to the cables or their connectors.
Line Power
Any power supply used with the DiamondBack must provide a minimum of 1.5 amps,
continuous, at 12 to 24 VDC. Although the units will operate at 12 VDC, 13.8 VDC is
required to charge the internal UPS battery. This battery charges whenever the input
voltage is 13.8 VDC or higher. Full charge takes approximately 16 hours.
Power input is through a 4-pin XLR connector located on the left side of the rear panel;
see Figure 2. Be sure that AC outlets are within reach of their 6-foot power cords. The
Pin-out of the Power In connector is shown in Table 1.
1 ground
2 no connection
3 no connection
4 +12 to 24 VDC
Pin Signal
Table 1. Power Input Pin-out

Telecast Fiber Systems
3
Configuring Signal I/O
Rear Panel Connections
All setups and connections are on the rear panel, which is the same for the TX and RX
units; see Figure 2.
The rear panel has 8 BNC female connectors. From left to right in Figure 2, they are:
Channel TX & RX. Chan 8 to Chan 1 are the video or data inputs on the TX and
the corresponding channel outputs on the RX. Beneath each connector
is a Vid/Data toggle switch which must be configured for either video
(left) or data (right).
Caution: Toggle switches on the TX and RX must be in the same position,
channel-for-channel and unused inputs and outputs should be switched
into the VIDEO position.
Front Panel Indicators and Controls
The front panels of the RX and TX are shown in Figure 3.
Figure 3. Front Panels, TX (Upper) and RX (Lower)
Monitor RX & TX.A rotary switch to select the video channel for output to the
adjacent BNC. A standard composite video monitor can be connected
to this port.
Figure 2. Rear Panels, same for TX and RX

Diamondback™
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Signal TX (signal input) and RX (signal output). LEDs, one per signal
channel, which illuminate green when a video sync pulse
or a data stream is present. These LEDs will flicker when
unsynchronized video (e.g., RGB) is present.
Link RX only. Includes the following:
Fiber 1 & Fiber 2: LEDs which indicate the fiber being
used to communicate with the transmitter.
Select: A push-button that toggles between the two fiber
inputs. The default on power up is always Fiber 1,
if the TX is already activated.
Status: LED which illuminates green if the system has
valid optical data.
Power External: LED which illuminates green when 12 to 24 VDC of
external power is supplied to the unit.
Internal: LED which illuminates green after approximately 30
minutes of battery charging, and illuminates red when
external voltage is absent and the battery is discharging.
Alarm TX Alarm: An intermittent beep will sound when the alarm switch
is on and the system is being powered by the internal
battery backup. The alarm will stop automatically if
external power is restored.
RX Alarm: For power monitoring conditions, the RX alarm
functions the same as the TX alarm. For fiber switching
situations, the alarm will continue to sound even if the
opticalsignal is restored, indicating to the user the type of
malfunction that has occurred. The RX alarm Off/Reset
slide switch on the front panel must be manually reset.
System Examples
The combination of Telecast’s DiamondBack video multiplexer and Telecast’s Adder
161 Audio/Data multiplexer provides a powerful network solution for carrying audio,
video and data economically from point to point. the Adder can be connected to any
of the DiamondBack input chanelsl switched to “Data” position on the rear panel.
An example of an efficient use of the DiamondBack and theAdder 161 is shown in
Figure 4. The Adder 161 can multiplex up to 16 channels of audio, 2 streams of digital
data, and 4 switch closures for delivery on its coaxial output to the DiamondBack TX.
Another example, not pictured, could have two sets of Diamondbacks transmitting and
receiving in opposing directions. With this bi-directional transmission path (on one or
two fibers) the Adder 882i can supply up to 10 2-way intercoms.

Telecast Fiber Systems
5
Figure 4. Example of the DiamondBack/Adder 161 Network
Fiber Optic Cable Runs
The optical output from the TX is generated by a laser diode that is coupled to the
fiber. User connections are made at a bulkhead ST type connector on the rear
panel. Operation is primarily intended for use on single mode fiber; consult the factory
for multimode fiber operation.
The input at the RX uses a InGaAs pin diode and amplifier to convert the optical signal
back into an electrical signal.
Warning:
Never look directly into the end of a connected optical fiber while any component is
operating; eye damage is possible.
DiamondBack launches the signals into 9 micron diameter core single mode fibers.
Assembled cables and connectors are available from Telecast Fiber Systems, Inc.
Diamondback TX
D
iamondback RX
F
iber 1
Fiber 2
Adder 161 TX
A
dder 161 RX
7 Monitor Videos in 7 Monitor Videos out
coax
coax
1
6 Audio, 2 Data & 4 closures in
1
6 Audio, 2 Data & 4 closures out

Diamondback™
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The Transmitter’s optical outputs Fiber 1 and Fiber 2 have the following characteristics:
•Fully redundant
•Have independent power drivers
•Both remain active in the absence of a failure
The Receiver takes its signal selectively from Fiber 1. If the signal on Fiber 1 is lost,
the RX automatically switches to its Fiber 2 input. If the signal on Fiber 1 is restored,
and the signal on Fiber 2 is lost, the RX switches back to Fiber 1. If both fibers remain
active, pressing the Select button on the front panel will toggle between them.
Making the Fiber Connection
1. Inspect the fiber ends and clean them with dry compressed air or with Kim-Wipes
that have been wet with isopropyl alcohol. Fingerprints or other dirt on the optical
connector end surfaces will reduce the received optical signal level.
2. Connect the fibers to their matching ports on both the TX and RX units.
Optical Transmitter Losses
The maximum fiber distance is defined by the optical loss operating margin. The RX
signal must be - 21 dBm or higher. Losses on single mode fiber are approximately 0.5
dB/km or less. Refer to Table 1 for the expected TX output requirement and the
consequent RX input power.
Signal Min
TX Optical Output - 6dBm
RX Optical Input - 21dBm
Optical Loss Margin 15dBm
Table 2. Optical Loss Margin
Use an optical power meter for testing the optical signal development and its
transmission over the fiber. Instructions for this test are supplied with the meter.