Meridian DT-2V2K/2K User manual

Installation/Operation Instructions
Fiber Optic Video/Data Transmission System
Part Number:
DT-2V2K/2K
(Video Transmitter/Data Transceiver)
DR-2V2K/2K
(Video Receiver/Data Transceiver)
700 Elmont Rd, Elmont, NY 11003, Tel: [phone]; Fax: [phone]
www.Meridian-tech.com
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Table of Contents
1.0 PRODUCT DESCRIPTION.........................................................................3
2.0 INSTALLATION..........................................................................................3
3.0 PRODUCT SIGNAL FORMAT & SPECIFICATIONS .................................3
4.0 DATA SIM SIGNAL ASSIGNMENT (PINOUTS) ........................................4
5.0 OPTICAL SPECIFICATIONS .....................................................................5
6.0 TROUBLESHOOTING................................................................................6
700 Elmont Rd, Elmont, NY 11003, Tel: [phone]; Fax: [phone]
www.Meridian-tech.com
Page 2

1.0 Product Description
Meridian’s DT&DR-2V2K/2K product series are fiber optic modems that transmit two channels
of uni-directional digitized video and two bi-directional RS-485 (4-wire) data channels over one
optical fiber using digital transmission technologies. This product series uses Meridian’s
standard 2-slot wide chassis mount card assembly and plugs into the following Meridian chassis:
SR-1000/S, SR-1200/S, SR-1500/S, and SR-2001 & SR-2000 series 19” equipment chassis.
The digital modules consist of various plug-in personality function cards or SIMs. The top card
is the optical card that contains the fiber optic interface. The optical output (Tx) connector is
located on the left side of the module while the optical input (Rx) connector is adjacent to it on
the right side of the module. The second SIM contains the two video Input/Output coaxial
interfaces. The bottom SIM card contains the two bi-directional RS-485 data channels.
2.0 Installation
Series DT&DR-2V2K/2K products are two-slot wide cards and, as such, occupy two slots in
Meridian’s standard chassis (SR-1000/S, SR-1200/S, SR-1500/S, and SR-2001 & SR-2000 series
19” equipment chassis). To install in the chassis, orient the card with the Meridian logo at the top
of the module and slide onto the top and bottom card guides in the chassis. Press securely on the
top and bottom of the module to ensure that it is fully seated in the chassis so that the electrical
connector mates with the chassis-mounted motherboard. Once installed, manually tighten the two
thumbscrews located at the top and bottom of the card. Do not use tools to secure these and do
not over tighten.
Note: A fully loaded subrack should have forced-air cooling to avoid excessive heat generation
inside the chassis. A fan assembly tray (P/N FA-2000) with three (3) fans is available and should
be installed under the 19" SR-2000/1 whenever possible.
3.0 Product Signal Format & Specifications
The DT&DR-2V2K/2K series products transmit and receive the following signals:
Signal Type Channels Transmit Receive
NTSC/PAL video 2 DT-2V2K/2K DR-2V2K/2K
RS-485 (4-wire) 2 Yes Yes
700 Elmont Rd, Elmont, NY 11003, Tel: [phone]; Fax: [phone]
www.Meridian-tech.com
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The tables below identify the specifications for the various signals that these modems
transmit/receive.
Video
Format NTSC, PAL, SECAM
Voltage/Impedance 1Vp-p, 75Ω, 1.5Vp-p (max)
Differential Gain <1%
Differential Phase <0.7o
SNR >60dB (weighted)
Return Loss >30dB
Field Tilt <0.5%
Data
Formats RS-485 (4-wire)
Data Rate (RS-485) DC to 300Kb/s
Bit Error Rate (BER) Better than 10-9
Connectors
Video 75ΩBNC w/gold center pin
Data DB9 Female
Optical Singlemode – ST or FC
Multimode - ST
4.0 Data SIM Signal Assignment (Pinouts)
There is one data SIM card in these modules. This data cards transmits/receives two
RS-485 (4-wire) data channels. The data SIM has a DB9 female connector.
The table below shows the appropriate pinout for each of the connectors
RS-485 Data Connector Pinout Assignment
(Port #4)
Pin # DT-2V2K/2K DR-2V2K/2K
1 Ch1 OUT (+) Ch1 IN+
2 Ch1 OUT (-) Ch1 IN (-)
3 Ch 2 OUT+ Ch2 IN (+)
4 Ch 2 OUT (-) Ch2 IN (-)
5 Gnd Gnd
6 Ch 1 IN+ Ch1 OUT (+)
7 Ch 1 IN (-) Ch1 OUT (-)
8 Ch 2 IN+ Ch2 OUT (+)
9 Ch 2 IN (-) Ch2 OUT (-)
700 Elmont Rd, Elmont, NY 11003, Tel: [phone]; Fax: [phone]
www.Meridian-tech.com
Page 4

DT-2V2K/2K
(
4-wire
)
DR-2V2K/2K
(
4-wire
)
Figure 4.1Figure 4.1
Front Panel Layout/Pinout DiagramsFront Panel Layout/Pinout Diagrams
5.0 Optical Specifications5.0 Optical Specifications
Optical SpecificationsOptical Specifications
Fiber Type/Size
(um)
Optical
Output
(dBm)
Rx
Sensitivity
(dBm)
Optical
Budget
(dB)
Wavelength
(nm)
Optical
connector
Optical
Dynamic
Range (dB)
Multimode (FP Laser)
62.5/125 -3 -24 21 1300/850 ST 24
Singlemode (FP Laser)
9/125 -3 -24 21 1310/1550 ST, FC 24
Singlemode (DFB
Laser)
9/125
[phone]/1550 ST, FC 24
700 Elmont Rd, Elmont, NY 11003, Tel: [phone]; Fax: [phone]
www.Meridian-tech.com
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6.0 Troubleshooting
Below is a listing of several problems that may arise during the installation & operation of the modules. If
you are having difficulty installing or operating the modules please refer to this list below.
Problem: Module does not fit in chassis slots
Action: Check module orientation. Meridian “Globe” must be oriented on the top left hand side
of the module
Make sure the card guides in the chassis are aligned with the extrusion on the module
Problem: Card power LED does not light when power to the module/subrack is applied or power
indicator turns on and off
Action: Check power supply to ensure that it is plugged in and turned on. If flashing continues,
move module to another chassis or location in the same chassis, if available.
Problem: No video at output of module
Action: Check to ensure that the video channel-specific LEDs are on (Green). Also, check to
ensure that the optical LEDs are ON. If no video is still present, check to ensure that the
monitor is ON and the video cable is connected to the correct video port on the Rx
module.
Problem: Video image is dark
Action: Check the iris control on the camera to ensure that it is open to the proper amount for the
conditions
Problem: Video image is too bright and appears overexposed
Action: Check the Video overload indicator on the Rx module. If it is Red, the video signal level
is too high and the CCTV iris should be checked to ensure that it is open properly for the
conditions.
Problem: No Data
Action: Check the data input status indicator light #1 on the transmit module to ensure it is on
(indicating a data input signal). Also check the data output status indicator light #2 on
the corresponding receiver module to ensure that the signal is being transmitted and
received. If not, please check the data input/output and fiber connections.
If the problem still persists after reviewing the above items, please contact Meridian technical
support (516-285-1000).
700 Elmont Rd, Elmont, NY 11003, Tel: [phone]; Fax: [phone]
www.Meridian-tech.com
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