Maxcom MX3257HD Installation instructions

MAXCOM PRODUCT SPECIFICATIONS
Description
The rack-mountable MX3257HD fiber optic video
multiplexer is ideal for transmitting 1 channel of video, 2
channels of audio and 1 high speed serial data channel
on one fiber optic cable.
The high speed serial data channel may be either DVB-
ASI or SMPTE-310M. The MX3257HD’s High Speed
Serial data channel employs automatic cable
equalization for error free operation over long coaxial
cable runs.
The MX3257HD operates by digitizing and multiplexing
video, audio and high speed data onto a high-speed
serial data stream, which is then transmitted via fiber
optics.
Because the system employs digital transmission
techniques, performance characteristics are consistent
and maintained over the specified distance with no
degradation of signal.
The MX3257HD is designed to work with standard
singlemode or multimode fiber optic cable and can be
wall mounted or rack mounted. Both transmitter and
receiver come equipped with internal power supplies.
Optical Link LEDs facilitate the continuous monitoring of
the fiber optic system.
FIBER OPTIC VIDEO / AUDIO / ASI LINK
Model MX3257HD
Model Selection Guide
Model
Description
MX3257HDT-1S-1V-2A-ASI-SCA-40
Fiber Optic Mux TX, 1 Video, 2 Audio, 1 DVB-ASI, Singlemode, SC/APC Connector, 40 Km
MX3257HDR-1S-1V-2A-ASI-SCA-40
Fiber Optic Mux RX, 1 Video, 2 Audio, 1 DVB-ASI, Singlemode, SC/APC Connector, 40 Km
MX3257HDT-1S-1V-2A-S310-SCA-40
Fiber Optic Mux TX, 1 Video, 2 Audio, 1 SMPTE-310, Singlemode, SC/APC Connector, 40 Km
MX3257HDR-1S-1V-2A-S310-SCA-40
Fiber Optic Mux RX, 1 Video, 2 Audio, 1 SMPTE-310, Singlemode, SC/APC Connector, 40 Km
MX3257HDT-1S-1V-2A-ASI-SCA-80
Fiber Optic Mux TX, 1 Video, 2 Audio, 1 DVB-ASI, Singlemode, SC/APC Connector, 80 Km
MX3257HDR-1S-1V-2A-ASI-SCA-80
Fiber Optic Mux RX, 1 Video, 2 Audio, 1 DVB-ASI, Singlemode, SC/APC Connector, 80 Km
MX3257HDT-1S-1V-2A-S310-SCA-80
Fiber Optic Mux TX, 1 Video, 2 Audio, 1 SMPTE-310, Singlemode, SC/APC Connector, 80 Km
MX3257HDR-1S-1V-2A-S310-SCA-80
Fiber Optic Mux RX, 1 Video, 2 Audio, 1 SMPTE-310, Singlemode, SC/APC Connector, 80 Km
Other Connectors and Distances Available Upon Request
Features
High Quality 10 Bit Digital Sampling of Video Input
High Speed Data Channel for DVB-ASI or SMPTE-310M
High Speed Data Channel employs Automatic Cable Equalization
Digital Transmission of Stereo Audio
Baseband Video or composite Video/Audio Transmission over video channel
External Audio Compatible with Balanced or Unbalanced Audio Formats
High Quality Uncompressed Digital Transmission
67 dB SNR

OPTICS
90 - 240 VAC
47 - 63 Hz
Video Audio SC
+ I + I
G
G
1
2
+ I + I
G
G
3
4
Audio
Rear Panel
Standards
NTSC, PAL, SECAM
Channels
(1) Video, (2) Audio & (1) High Speed Data
Video Bandwidth
SNR / dP / dG
10 Hz to 6.5MHz
67 dB, < 1 deg / < 1%
Video I/O
BNC, 1V p-p, 75 Ohm
High Speed Data
BNC, 1V p-p, 75 Ohm
DVB-ASI @ 270Mbps, SMPTE-310M @ 19.4 Mbps
Stereo Audio I/O
Terminal Block, 1Vp-p, 10 KOhm
Physical Dimensions
17” x 1.75” x 10”
Environment
Temperature: Operating: 0C to 50C
Storage: -20C to 70C
Humidity:
Operating: 10% to 90% RH
Storage: 5% to 90% RH
Input Power Requirements:
Voltage: 90 – 240 VAC, 47- 63 Hz
2248 Meridian Ste H
Minden, Nv. 89423
1-877-330-5333
W
WW WW W. .M MA AX XC CO OM MC CP PR RP P. .C CO OM M
Package Includes
Transmitter or Receiver (Must be purchased separately
Power Cord
Rack-mountable hardware
Easy to follow owner's manual
Warranty
5 year limited warranty
Video I/O: BNC, 75 Ohm
Stereo Audio Terminal Block, 10K Ohm
AC Power Input
Optical I/O
SC/PC or SC/APC
High Speed Data Channel: BNC, 75
Ohm
- DVB-ASI (270Mbps Transport)
- SMPTE-310M 19.4Mbps

User’s Manual
MAX3257HD Series
Model: MAX3257/4A/3HD
1 VIDEO / 4 AUDIO / 3 DVB-ASI CWDM multiplexer
Video / Audio / ASI Fiber Optic Multiplexing System
Installation and User Guide

3257 HD Series User’s Manual No: UM-3257-D2
Page 2 www.maxcomcorp.com
TABLE OF CONTENTS
1 SAFETY INSTRUCTIONS
2 INTRODUCTION
2.1 System Description
2.2 Front Panel Indicator Description
2.3 Rear Panel Indicator Description
3 INSTALLATION
3.1 General Installation
3.2 Power Connection
3.3 Fiber Optic Cables Connection
3.4 Video Connections
3.5 Audio Connections
3.6 Balanced Audio Connections
3.7 Unbalanced Audio Connections
3.8 External Audio Sub-Carrier Connections
3.9 DVB-ASI Connections
4 OPERATION

3257 HD Series User’s Manual No: UM-3257-D2
Page 3 www.maxcomcorp.com
1 SAFETY INSTRUCTIONS
THE 3257 SYSTEM MAY CONTAIN A CLASS IIIb LASER. PLEASE OBSERVE THE
FOLLOWING SAFETY PRECAUTIONS THAT APPLY TO LASER EQUIPPED UNITS.
WARNING: Do not disconnect the fiber optic external connector with the power turned
on. Exposure to Class IIIb Laser radiation is possible when the external fiber connector
is disconnected while the unit is still powered up. Ensure the rubber boot is in place
whenever the fiber optic cable is disconnected.
CAUTION: Attempting to make adjustments or performing operations other than those
specified may result in hazardous radiation exposure. Exposure for only seconds can
cause permanent eye damage as well as other injuries.

3257 HD Series User’s Manual No: UM-3257-D2
Page 4 www.maxcomcorp.com
2 INTRODUCTION
2.1 System Description
The 3257 HD Series is a Video / Audio / DVB-ASI fiber optic multiplexer. The 3257 Series
video modules can be configured to transmit simplex (one direction) or duplex (two direction) video &
audio, and 1 to 4 DVB-ASI signals using CWDM technology. Depending on the distance requirements
between sites, the 3257s may be equipped to operate over multimode or single mode fiber. Distances
between the transmitter and receiver can be up to 3 Km for multimode operation and up to 120 Km for
single mode operation
.
SYSTEM I/O CONFIGURATION
Each of the four ports can be configured for one of the following options:
Simplex Video and Simplex Audio –2 Channels
Simplex Video and Simplex Audio –4 Channels
Simplex Video and Simplex Audio –6 Channels
Simplex Video and Simplex Audio –8 Channels
DVB-ASI –1 to 4 channels
VIDEO / AUDIO TECHNOLOGY:
The 3257 system uses uncompressed 10 bit analog to digital modulation techniques which
provides excellent video quality. The audio circuitry also digitizes the audio signals prior
to transmission. The 2 channels of audio may be used for stereo audio or for two separate
channels of audio.
DVB-ASI Transmission Technology
The ASI option on the 3257HD series will accept any PCM 1Vp-p, 75 ohm
signal up to 600Mbps. The digital electrical signal connected to the BNC connector is
converted to an optical signal. The ASI circuit’s receiver takes the incoming optical signal and
converts it back to electrical I/O: 75 Ohm up to 1Vp-p. The interface will NOT accept bipolar
signals; such as T1, T3, E1 or E3.

3257 HD Series User’s Manual No: UM-3257-D2
Page 5 www.maxcomcorp.com
Power Link
Status
MAXCOM
2.2 Front Panel Indicators
The following diagram depicts the front panel indicators:
Link Indicator (light off):
TX –Problem with Transmitter
RX –Problem with Optical link
Power Indicator
Link Indicator (light on):
TX –Transmitter status OK
RX –Optical link OK

3257 HD Series User’s Manual No: UM-3257-D2
Page 6 www.maxcomcorp.com
2.3 Rear Panel Indicators
The following diagram depicts the 3257T and 3257R rear panel configuration
with optional audio channels installed:
NOTE: Model Depicted is configured with 1 Video 8 Audio and 4 ASI Channels

3257 HD Series User’s Manual No: UM-3257-D2
Page 7 www.maxcomcorp.com
90 - 240 VAC
47 - 63 Hz
0
1
FUSE
3 INSTALLATION
3.1 General Installation
The units may be shelf mounted, 19” EIA rack mounted or table mounted. In
order to mount the units in an 19” rack, the Rack Mount Brackets must be first
installed by mounting the brackets to the mounting holes in the sides of the
3257.
Make sure that there is enough space to pull and connect both the electrical
data and optical cables without stressing them beyond the manufacturer’s
limitation strain specifications or exceeding the cable’s minimum bend radius.
3.2 Power Connection
The 3257 Series is compatible with 90 - 240 VAC power, 47Hz – 63Hz.
The Power Entry Module incorporates an IEC 3 prong power input connector, a switch
and a fuse holder, shown below:
IEC 3 Prong Power Input
Power Entry Module
Fuse Holder
On / Off
Switch

3257 HD Series User’s Manual No: UM-3257-D2
Page 8 www.maxcomcorp.com
3.3 Fiber optic cable connection
Verify that the fiber cable meets the 3257 Series’ transmission requirements.
Relevant cable specifications include loss, distance (dispersion) and return
loss.
Optical Specifications: For MX3257/2HD
Service
wavelength
Tx Output
Power
Rx Receiver
sensitivity
Loss in Fiber
Video +Audio
1310nm
-5dbm
-30dbm
0.35dbm/Km
HD Ch 1
1510nm
-3dbm
-24dbm
0.27dbm/km
HD Ch 2
1550nm
-3bbm
-24dbm
0.25dbm/km
Optical Specifications: For MX3257/3HD
Service
wavelength
Tx Output
Power
Rx Receiver
sensitivity
Loss in Fiber
Video +Audio
1510nm
-3dbm
-24dbm
0.27dbm/Km
HD Ch 1
1530nm
-3dbm
-24dbm
0.26dbm/km
HD Ch 2
1550nm
-3bbm
-24dbm
0.25dbm/km
HD Ch 3
1570nm
-3dbm
-24dbm
0.26dbm/Km
]

3257 HD Series User’s Manual No: UM-3257-D2
Page 9 www.maxcomcorp.com
+ I + I
G
G
1
2
+ I + I
G
G
3
4
+ I + I
G
G
5
6
+ I + I
G
G
7
8
Audio
Video
3.4 Video Connections
Video signals are sent over a 75 ohm coax cable terminated in a BNC
connector (e.g. RG 59U with a BNC connector)
a. At the TX end (3257T), connect the video source to the VIDEO BNC
connector.
b. At the RX end (3257R), connect the VIDEO BNC to monitor. The output video
level may be adjusted by using a small screwdriver to turn the screw above the
output video connector, as shown below:
Video Output Level Adjust (RX only)
Video INPUT/ OUTPUT Connector:
75 Ohm, BNC

3257 HD Series User’s Manual No: UM-3257-D2
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www.maxcomcorp.com
+ I + I
G
G
1
2
+ I + I
G
G
3
4
+ I + I
G
G
5
6
+ I + I
G
G
7
8
Audio
Video
3.5 Audio Connection
The 3257 Models have either simplex or duplex audio. The 3257 supports both
balanced audio and unbalanced audio. Accessing the audio I/O requires connecting
to one or both channels of audio. The audio input and output impedance is
10Kohms.
The Audio Terminal Block on the Video/Audio module provides the connectivity for
transmitting and receiving audio. The illustrations below show how to connect
balanced and unbalanced audio:
3.6 Balanced Audio (Differential)
For Balanced audio connections, connect the audio “+” lead to the respective audio
channel “+” input and the “-“ lead to the audio channel “-‘ lead, as shown below.
Balanced Audio Input
Audio Channel 1, 3, 5, 7
Connect Ground to TB Pin 1
Connect Input + to TB Pin 2
Connect Input –to TB Pin 3
Audio Channel 2, 4, 6, 8
Connect Input + to TB Pin 4
Connect Input –to TB Pin 5
Connect Ground to TB Pin 6
Balanced Audio Output
Audio Channel 1, 3, 5, 7
Connect Ground to TB Pin 1
Connect Input + to TB Pin 2
Connect Input –to TB Pin 3
Audio Channel 2, 4, 6, 8
Connect Input + to TB Pin 4
Connect Input –to TB Pin 5
Connect Ground to TB Pin 6

3257 HD Series User’s Manual No: UM-3257-D2
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+ I + I
G
G
1
2
+ I + I
G
G
3
4
+ I + I
G
G
5
6
+ I + I
G
G
7
8
Audio
Video
3.7 Unbalanced Audio (Single Ended)
For Unbalanced audio connections, connect the audio I/O to the respective “+” and
“GND“ leads on the output audio connector, as shown below.
Note: Unbalanced Audio output will be 3dB less than input
Note: DO NOT connect the (-) lead to ground on the audio OUTPUT as this may
create noise on the ground, which may distort the video signals.
UnBalanced Audio Input
Audio Channel 1, 3, 5, 7
Connect Ground to TB Pin 1
Connect Input + to TB Pin 2
Audio Channel 2, 4, 6, 8
Connect Input + to TB Pin 4
Connect Ground to TB Pin 6
UnBalanced Audio Output
Audio Channel 1, 3, 5, 7
Connect Ground to TB Pin 1
Connect Input + to TB Pin 2
Audio Channel 2, 4, 6, 8
Connect Input + to TB Pin 4
Connect Ground to TB Pin 6

3257 HD Series User’s Manual No: UM-3257-D2
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3.8 External 4.5Mhz Audio Sub-Carrier
The 3257 Series also includes an option for transmitting video, audio and a 4.5Mhz audio sub-
carrier as an external signal. The figure below depicts the 3257 set up with video, 4 channels
of baseband audio and an external audio sub-carrier channel. The audio sub-carrier channel
uses a BNC connector with 75 ohm impedance.
+ I + I
G
G
1
2
+ I + I
G
G
3
4
AudioVideo Audio SC
Video I/O
BNC
75 Ohm
Baseband Audio I/O
External Audio Sub-Carrier I/O
BNC Connector
75 Ohm

3257 HD Series User’s Manual No: UM-3257-D2
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3.9 DVB-ASI Connections
DVB-ASI signals are sent over a 75 ohm coax cable terminated in a BNC
connector (e.g. RG 59U with a BNC connector)
The DVB-ASI I/O will accept ANY PCM signal from 1Mbps to 600Mbps that is
less than 1Vp-p and is compatible with 75 ohm terminations.
The DVB-ASI connection is NOT compatible with T-3 (DS3), T1 (DS1), or any bipolar
Signal .Each HD transport stream is send on different CWDM optical wavelength

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4 Operation
Turn-On Procedure
To operate the 3257 video transmission system:
1. Install the 3257 units to the appropriate power supply using the power entry
module to provide power via an IEC 3 prong cable.
2. The indicator “POWER” on the front panel shows that the unit is properly
powered.
3. Install the fiber optic cables to the 3257
4. Verify that the LINK lights are illuminated. This indicates that the unit has a
good optical link.
5. Connect the Video and Audio Input and Output Signals
Verify that video and audio is being received properly.