INSTRUCTION MANUAL
DVM-2200
DIGITAL VIDEO, AUDIO & DATA
FIBER OPTIC MULTIPLEXER
TRANSPORT SYSTEM
MULTIDYNE Electronics, Inc.
Innovations in Television Testing & distribution
1-(800)-4TV-TEST, 1-(800)-488-8378
191 FOREST AVENUE
LOCUST VALLEY, NY 11560-2132 USA
(516)-671-7278 FAX (516)-671-3362
MULTIDYNE and DVM-2200 are registered trademarks of MULTIDYNE Electronics, Inc.
Copyright 2001 MULTIDYNE Electronics, Inc., Locust Valley, New York. Printed in the United
States of America. All Rights Reserved. Contents of this publication may not be reproduced in
any form without the written permission of MULTIDYNE Electronics, Inc.
This product was designed and manufactured in the
UNITED STATES of AMERICA
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TABLE OF CONTENTS
INTRODUCTION 4
FEATURES AND OPERATION 4
VIDEO CHANNEL 4
TRANSMITTER, DVM-2200-FTX 5
RECEIVER, DVM-2200-FRX 5
AUDIO CHANNELS 5
DATA CHANNELS 5
SDI SETTINGS 6
SDI DATA RATE SETTINGS FOR THE MANUAL MODE ONLY: 6
ALARMS 6
OPTICAL OPTIONS 6
INSTALLATION 6
POWER REQUIREMENTS 7
CIRCUIT DESCRIPTION 7
DVM-2200-FTX TRANSMITTER DESCRIPTION 7
DVM-2000-FRX RECEIVER SECTION 8
SPECIFICATIONS 9
DRAWINGS 10
DVM-2200-FTX TRANSMITTER & DVM-2200-FRX RECEIVER D-TYPE CONNECTOR WIRING DIAGRAM 10
DVM-2200-FTX TRANSMITTER MECHANICAL DRAWING 11
DVM-2200-FRX RECEIVER MECHANICAL DRAWING 12
UTIL-200-DVM TRAY MECHANICAL DRAWING 13
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Instruction Manual, DVM-2200 INTRODUCTION 4
INTRODUCTION
The DVM-2200 12 Bit Video and 24 Bit Audio Fiber Optic Transport offers state-of-the-art
performance exceeding RS250C Short-haul and Broadcast Specifications with a Signal to Noise
ration exceeding 75 dBs. The system will support one video, up to 6 audio and up to 3 data
channels per optical wavelength.
multiple optical sources to share a single fiber, multiplying the capacity of fiber optic cables by a
factor of eight. Applications include links from studio to transmitter, studio to studio, studio to
CATV head-end, distance learning and backhaul feeds from special events. The transmit and
receive units are available in portable and rack-mount packages making the system ideal for both
field and studio applications. The transmit unit includes a 1000 feet post-equalizer for 8281 type
cable.
The user can (WDM) Wave Division Multiplex, permitting
FEATURES and OPERATION
!!!!!! DANGER !!!!!!
INVISIBLE LASER RADIATION
AVOID DIRECT EXPOSURE TO BEAM
OUTPUT POWER MAX: 2 mW. WAVELENGTH: 1300/1550 NM. CLASS III b LASER
The optical laser transmitter may harm the human eye. Proper eye
protection should be used at all times when working with laser. Please read the entire
manual before operating the Fiber Optic devices.
WARNING
HIGH VOLTAGES INSIDE
The unit should be only serviced or opened by qualified personnel.
There are no user serviceable parts or adjustments inside.
VIDEO CHANNEL
The video performance of the fiber optic system exceeds RS-250C Short-haul
specifications. The system uses state-of-the-art technology to offer a true 12 bit Video Analog to
digital conversion and a 24 bit Audio A to D conversion. By using 12 bits we are able to achieve
a Signal to Noise ration of over 75 dBs. The system is ultra linear and distortion free giving
differential gain and phase of less than 0.3 % and 0.3 degrees, respectively. The video input and
output signals are back-porch clamped.
The system has a video bandwidth of 8 MHz. The transmission of NTSC, PAL, SECAM
and video with diplexed audio carriers at 4.5 MHz, 5.8 MHz and 6.4 MHz are fully compatible with
the fiber optic system.
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Instruction Manual, DVM-2200 FEATURES and OPERATION 5
TRANSMITTER, DVM-2200-FTX
The transmitter unit, designated by model number DVM-2200-FTX, includes a VIDEO IN
BNC connector, J5, in the rear of the UTIL-200-DVM Tray and a front edge equalizer monitoring
BNC. The gain and equalizing flatness of the input video can be adjusted from the front edge and
monitored from the front edge output. The VIDEO gain and video EQU controls can be found on
the transmitter front edge. For optimal system performance the VIDEO gain and video EQU
adjustments should be set for 100 IRE units and a flat frequency response, respectively. The
transmitter front panel includes a VIDEO PRES LED to indicate the delivery of video to the A to
D. The laser FAIL LED indicates a laser failure when RED. The audio level OVF LEDs indicate
an audio level overflow in the audio A to D when RED. This typically occurs when the input level
exceeds +18 dBm. The SDI Serial Digital Video input is J1 on the rear of the Tray. When an SDI
signal is present, it takes priority and is transported through the system. When no SDI is present,
the analog video and audio signals are transported. The POWER LED indicates that power is
ON the UTIL-200-DVM power supply units. The SDI input has a squelch circuit controlled by
R51. The clock-wise position turns the squelch OFF. The squelch is set to prevent false SDI
triggers due to noise.
RECEIVER, DVM-2200-FRX
The receiver unit, designated by model number DVM-2200-FRX, includes a VIDEO OUT
BNC connector, J5, on the rear of the UTIL-200-DVM. The receiver front panel includes a VIDEO
PRESENT LED, labeled VIDEO, to indicate the delivery of video to the A to D. The NO
LOCK/SDI LED, labeled NO LOCK, indicates that the decoder multiplexer is not locked or that an
SDI signal is present when RED. The SDI Serial Digital Video output is J1 on the rear of the
Tray. When an SDI signal is present, it takes priority and is transported through the system. The
VIDEO GAIN is controlled by the potentiometer VID. The AUDIO GAIN is controlled for channels
1 through 6 via the potentiometers labeled 1 through 6. The POWER LED indicates that power
is ON. The jumper J5 should be set in the SYNC mode with the jumper in the left most position.
The jumper J4 should be in the upper position.
AUDIO CHANNELS
The fiber optic system includes 6 channels of high quality CD grade audio encoded in 24
bits. The balanced audio inputs are High impedance by default. When the optional –DVMAUDIO
Screw Terminal Adapters are used, the input impedance is 600 Ohms by default. The 600-Ohm
termination may be removed for high impedance operation. The balanced audio outputs have a
source termination of 50 Ohms. The system is able to accommodate a maximum input and
output level of +18 dBm with a 600-Ohm termination. The input level to the transmitter should not
exceed +18 dBm. The AUDIO OUTPUT LEVELS on the receiver have a +/- 6 dBm gain
adjustment for setting system audio levels, labeled CH1 through CH6. The audio I/Os are
brought to a 25-pin D-type connector on the rear of the UTIL-200-DVM Tray. When using the
optional –DVMAUDIO adapter board, the audio I/O’s are labeled A1+, A1- through A6+, A6-
respectively. The terminal labeled GND is the audio ground connection.
DATA CHANNELS
The fiber optic system can accommodate up to 3 simplex RS-232 data channels. The 3
RS-232C data channel connections are labeled as D0, D1 and D2. The terminal labeled GND is
the data ground connection.
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Instruction Manual, DVM-2200 FEATURES and OPERATION 6
SDI SETTINGS
By default the SDI settings on the receiver are set for the SMPTE and Automatic modes.
In most applications you will not need to change any of these settings. Jumper J6 should be set
in the SMPTE mode which is the down of lower position. The Automatic/Manual jumper is
located to the right of the oscillator Y1 and below transistor Q5. The upper position, AUTO is the
automatic setting. In the AUTO mode the jumpers J7, J8 and J9 should be in the OPEN
state. When a noisy SDI signal is present, it may be necessary to put the SDI re-clocker into
manual mode. The MAN or manual mode is the lower position. In the manual mode it is
necessary to set the desired SDI data rate using jumpers J7, J8 and J9. The chart below shows
the settings. The logic 1 settings for J7 and J8 are the lower position with the upper position logic
0. The logic 1 setting for J9 is the left position with the right position logic 0.
SDI Data Rate Settings for the Manual Mode ONLY:
J9 J8 J7
143 Mbps 0 0 0
177 Mbps 0 0 1
270 Mbps 0 1 0
360 Mbps 0 1 1
540 Mbps 1 0 0
ALARMS
The VLOSS alarm output indicates the loss of video signal when asserted LOW. The
ALARM output indicates a laser failure in the transmitter unit or that the de-multiplexer has not
locked when asserted low.
OPTICAL OPTIONS
The DVM-2200 Fiber Optic system is available in several different optical configurations.
There are multi-mode systems available with 1310 nm wavelengths. The multi-mode systems
are available with ST connectors. The Singlemode laser systems are available in 1310 nm and
1550 nm wavelengths with ST, SC or FC connectors. The 1310 nm single-mode laser system is
available with -8 dBm, -3 dBm, 0 dBm and +3 dBm optical powers. The 1550 nm single-mode
laser system is available in an optical power of +3 dBm. Please read the section INSTALLATION
and HANDLING for further information.
INSTALLATION
Extreme caution should be used when handling Laser equipment. Appropriate eye
protection should be worn at all times. Direct exposure to the eyes and skin can be harmful. The
video, audio, data and optical connections can be found in the sections above. There are no user
serviceable parts or adjustments inside the system. The only user controls and interfaces are
present on the front and rear panels. If service or calibration adjustments are necessary please
return the system to the factory.
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Instruction Manual, DVM-2200 FEATURES and OPERATION 7
When installing a 1310 or 1550 nm Singlemode Laser system the launched optical power
can vary from -8 dBm to +3 dBm depending on the model purchased. The receiver will
compensate for variations in optical attenuation. The receiver unit will operate with an optical
signal from –32 to +3 dBm with out over-load.
The DVM-2200-FRX Fiber Optic Receiver for Singlemode applications all has an optical
window from the wavelength of 1100 to 1600 nm. If a Singlemode system is to be Wave Division
Multiplexed with other optical wavelengths in the 1100 to 1600 nm range, the appropriate optical
filters and wave division multiplexers should be used. The user may contact MULTIDYNE to
purchase such devices.
POWER REQUIREMENTS
The UTIL-200-DVM-AC operates from 85 to 265 VAC with two dual redundant power
supplies each with a separate line cord. The UTIL-200-DVM is available with a 48 VDC Telco
Power supply. The PWR 1 and PWR2 LEDs glow green when the unit is powered up and
operating properly. If the unit is plugged into an active outlet and the POWER LED does not
glow, check the internal fuse.
NOTE
Use only a 2 Amp replacement fuse for the PS-200-DVM-AC and PS-200-DVM-48VDC power
supplies
for the UTIL-200-DVM Series of Trays
CIRCUIT DESCRIPTION
The Multidyne DVM2200 is a highly linear low noise, low distortion fiber optic link.
The circuitry in the transmitter processes and digitizes seven analogue and 3 digital signals and,
through high speed time division multiplexing, serializes them into a single, self clocking bit
stream that modulates the output of an LED or a laser. At the receiving end a high speed
demultiplexer extracts the imbedded clock and then the data in a parallel format to be presented
to seven digital to analogue converter that reconstruct the 7 analogue signals.
DVM-2200-FTX TRANSMITTER DESCRIPTION
U22 is an AD8052 dual wide band operational amplifier. The first half is the input video
buffer. It interfaces video to the anti-aliasing low pass filter after some processing. Diodes D10 to
D13 suppress transients that could be harmful to the buffer. R60 adjusts the common mode
rejection of the buffer. Capacitors C89 to C92 together with resistors R65 to R68 form a 4-pole
variable cable equalizer that restores the phase and amplitudes of certain video frequency
components. LPF1 is an elliptical 11-pole low pass filter. It attenuates out of band signals that
would produce aliasing products at the output of U23, the video analogue to digital converter. The
second half of U22 is the video post amplifier that overcomes the filter losses and, through the
adjustment of C68 trims the high frequency response of the input video channel. R48 is adjusted
to 1VPP terminated in 75 . Q1 is the video sync separator. Composite sync is present at Q1’s
collector. Q2 is a “box car” pulse former that generates a positive going pulse beginning with the
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Instruction Manual, DVM-2200 FEATURES and OPERATION 8
second edge of horizontal sync and ending approximately with the end of color burst. The positive
pulse is AC coupled to the gate of Q3 a junction NFET that abruptly conducts during burst time
and dumps the average DC value plus any low frequency component into C57. U29, a very high
gain amplifier, applies the DC error in phase opposition to the input buffer thus canceling its
effects and clamping the video’s back porch to the level set by R7. U20 is a high precision pushpull video driver. The analogue to digital converter wants to see video 4 volts (2 volts on each
side) of push pull video centered on its +2V reference, U20 does just that. The video channel is
adjusted using full level modulated stair step as follows. Adjust the video front panel controls for
a well-equalized 1VPP at J9 then while monitoring video at the receiver’s output adjust R70 for
maximum gain and R7 to center the DC bias for not clipping of the chroma or sync. It is very
helpful to monitor U23 pin 14 for no pulses during this adjustment. U23 makes a 12-bit
measurement of the video at every tick of the clock supplied by a monolithic crystal oscillator Y1.
U24 is the high-speed monolithic serializer. It accepts 16 bits plus system clock and serializes
them into a single differential PECL bit stream that drives the laser or LED module.
The audio section interfaces a well balanced audio signal to the audio analogue to digital
converters. U1, U5 and U9 are dual audio buffers. They convert balanced audio to single ended.
U2, U3, U6, U7, U10 and U11 convert single ended audio to accurately balanced audio ready to
be digitized by U4, U8 and U12 stereo analogue to digital converters. U4 is the master that
supplies drive signals to U8 and U11. LEDs 1, 2 and 3 indicate overflow. U18 strobes the
registers where this overflow signals are being stored. They glow when the input audio goes over
+19bB. All measurements are performed at input level of +18dBm. U15 is a quadruple digital
multiplexer. It inserts external asynchronous data into the digital audio user bit location. Normally
only 2 channels are used for external data while the third one carries video presence indication
from the transmitter to the receiver. Alarms are provided at the transmitter end for laser failure
and for video loss. At the receiver end there are alarms for remote video loss and loss of optical
input. The optical failure alarms on both sides are dry relay contacts grounding the external
connection, the video loss failure are on both sides open collectors sinking 40mA positive DC to
ground. U20 is an automatic reset generator.
DVM-2000-FRX RECEIVER SECTION
The data modulated light beam is transformed into a balanced PECL bit stream and
presented to U15, a monolithic high-speed deserializer. The internal state machine of U1 driven
asynchronously by Y1 a monolithic crystal oscillator, recombines the data into a 16 bit parallel bit
stream. Internal phase lock loops regenerate the sending end sampling clock with an edge
stability of a few pico-seconds. The first 12 bits of the reconstituted data are presented to U16,
the video analogue to digital converter that reconstitutes the original video signal. R16, a front
panel control varies the converter’s DC reference thus adjusting the output gain. LPF1 is the
reconstitution low pass filter that removes the clock components from the video. U17 provides
gain and flatness adjustments while interfacing the video to the outside world. The audio portion
transforms the three audio bit stream again into audio. The associated operational amplifiers are
2 pole low pass filters and output drivers. U1 edge detects the audio channel pulse and triggers
monostable multivibrator U3 that produces a strobe pulse occurring at the center of the digital
audio’s user bit location. The positive edge of U3’s output strobes that location recovering
external data and remote video presence indication. The whole audio system calibration relies
just on 6, one per channel, output gains.
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Instruction Manual, DVM-2200 SPECIFICATIONS 9
SPECIFICATIONS
Video Performance:
Exceeds the RS-250C Short-haul specification.
Signal to noise .............................................................................................> 75 dB
Differential gain............................................................................................ < +/- 0.3 %
Differential phase......................................................................................... < +/- 0.3
Chrominance to luminance gain ..................................................................< +/- 1 %
Chrominance to luminance delay ................................................................< +/- 10 nsec.
Frequency response to 8 MHz..................................................................... < +/- 0.1 dB
3 dB Bandwidth............................................................................................ 8 MHz
Luminance non-linearity............................................................................... < 1 %
Ringing ........................................................................................................ < +/- 0.5 %
Tilt................................................................................................................ < +/- 0.2 %
Video output & input impedance.................................................................. 75 Ohms
Audio Performance:
Signal to noise ............................................................................................. > 90 dB
Frequency response to 20 Hz to 20 KHz .................................................... < +/- 0.1 dB
Distortion ..................................................................................................... < 0.05 %
Audio output level, adjustable...................................................................... Unity, +/- 6 dBm
Maximum input & output level, 600 Ohm termination .................................. +18 dBm
Audio output impedance, balanced .............................................................50 Ohms
Audio input impedance, balanced (selectable)............................................ 600 Ohms or High
Data channels RS-232C, RS-422, CMOS
Power dissipation ........................................................................................ < 15 Watts, per unit
AC operation................................................................................................ 110 or 220 VAC (optional
48VDC)
Operating temperature................................................................................. 0 to +50 C
Portable and Wall-mount: ............................................................................7” L x 5 ¾” W x 1 ¾” H
Triple Rack-mount Kit for 3 modules (Part number -RMT): ......................... 7” L x 19” W x 1 ¾” H
Specifications subject to change without notice.
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Instruction Manual, DVM-2200 DRAWINGS 10
DRAWINGS
DVM-2200-FTX Transmitter & DVM-2200-FRX Receiver D-type Connector Wiring Diagram
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Instruction Manual, DVM-2200 DRAWINGS 11
DVM-2200-FTX Transmitter Mechanical Drawing
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Instruction Manual, DVM-2200 DRAWINGS 12
DVM-2200-FRX Receiver Mechanical Drawing
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Instruction Manual, DVM-2200 DRAWINGS 13
UTIL-200-DVM Tray Mechanical Drawing
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