Installation/Operation Instructions - AV-iQ
Installation/Operation Instructions
Fiber Optic Data Transmission System
Part Number:
DXA/DXB-4K/4K
(RS-485 Bi-Directional Data Transceiver)
700 Elmont Rd, Elmont, NY 11003, Tel: 516-285-1000; Fax: 516-285-6300
www.Meridian-tech.com
DXA/DXB-4K/4K
Page 1
02/08 Rev 1.0
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 ...............................................................................5
700 Elmont Rd, Elmont, NY 11003, Tel: 516-285-1000; Fax: 516-285-6300
www.Meridian-tech.com
DXA/DXB-4K/4K
Page 2
02/08 Rev 1.0
1.0 Product Description
Meridian’s DXA & DXB-4K/4K product series are fiber optic modems that transmit four bidirectional 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-1001/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 bi-directional optical input/output
connector is located on the right side of both the transmitter (DXA) and receiver (DXB) modules.
The bottom two SIMs card each contains the two uni-directional RS-485 data channels.
2.0 Installation
Series DXA & DXB-4K/4K products are two-slot wide cards and, as such, occupy two slots in
Meridian’s standard chassis (SR-1001/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 DXA&DXB-4K/4K series products transmit and receive the following signals:
Signal Type
RS-485 (4-wire)
Channels
Transmit
Receive
4
Yes
Yes
700 Elmont Rd, Elmont, NY 11003, Tel: 516-285-1000; Fax: 516-285-6300
www.Meridian-tech.com
DXA/DXB-4K/4K
Page 3
02/08 Rev 1.0
The tables below identify the specifications for the various signals that these modems
transmit/receive.
Data
Formats
Data Rate (RS-485)
Bit Error Rate (BER)
RS-485 (4-wire)
DC to 300Kb/s
Better than 10-9
Connectors
Video
Data
Optical
75? BNC w/gold center pin
DB9 Female
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
DXA/DXB-4K/4K
Pin #
1
DXA-(Port#3) DXB-(PORT#4)
Ch 1 IN (+)
DXA-(Port#4) DXB-(PORT#3)
Ch 1 OUT (+)
2
Ch 1 IN (-)
Ch 1 OUT (-)
3
Ch 2 IN (+)
Ch 2 OUT (+)
4
Ch 2 IN (-)
Ch 2 OUT (-)
5
Gnd
6
Ch 3 IN(+)
7
Ch 3 IN (-)
Ch 3 OUT (-)
8
Ch 4 IN (+)
Ch 4 OUT (+)
9
Ch 4 IN (-)
Ch 4 OUT (-)
Gnd
Ch 3 OUT (+)
Figure 4.1
Front Panel Layout/Pinout Diagram
700 Elmont Rd, Elmont, NY 11003, Tel: 516-285-1000; Fax: 516-285-6300
DXA/DXB-4K/4K
www.Meridian-tech.com
Page 4
02/08 Rev 1.0
5.0 Optical Specifications
Optical Specifications
Fiber Type/Size
(um)
Optical
Output
(dBm)
Rx
Sensitivity
(dBm)
-3
-24
9/125
-3
Singlemode (DFB
Laser)
+3
Multimode (FP Laser)
62.5/1 25
Singlemode (FP Laser)
9/125
Optical
Budget
(dB)
Wavelength
(nm)
Optical
connector
Optical
Dynamic
Range (dB)
21
1300/850
ST
24
-24
21
1310/1 550
ST, FC
24
-24
27
1310/1 550
ST, FC
24
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 powerindicator 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 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: 516-285-1000; Fax: 516-285-6300
www.Meridian-tech.com
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