1 MODEL FLD-496SA 9600 Baud FIBER OPTIC/FSK MODEM GDI COMMUNICATIONS, LLC 280 Interstate 80 Exit 1 PO Box 1330 Verdi, NV 89439 Phone (775) 345-8000 Fax (775) 345-8010
PROPRIETARY DATA This document contains confidential, proprietary data with all rights and titles reserved by GDI Communications LLC. By accepting this document, the recipient assumes custody hereof and agrees not to disclose this data or any portion of this data to any unauthorized person without the prior written consent of GDI Communications LLC. Recipient further agrees not to incorporate these drawings, specifications or technical information, in whole or in part, in any other product or endeavor. THIS LEGEND SHALL BE INCLUDED ON ANY REPRODUCTION OF THIS DOCUMENT
FLD-496SA 2 TABLE OF CONTENTS DESCRIPTION... 3 SPECIFICATIONS... 4 INSTALLATION... 4 MAINTENANCE... 6 CONNECTION DIAGRAM... 7
FLD-496SA 3 DESCRIPTION The FLD-496SA is a combination of a Fiber Optic Modem and a Type 496 Modem. The FLD-496SA has an FSK input and output to the Fiber Optic section of the Modem. This Modem will tie directly to the FSK interface of our type Model 496 Modems or other compatible FSK Modem as is used on NEMA traffic control equipment. The existing Modems used in the traffic control equipment can be left in place when converting over to a Fiber Optic system. This means that you don't have to worry about not having a standard EIA-232 interface available as with some NEMA Controllers. Just leave the existing Modems in place and connect the FLD- 496SA to the FSK lines from the existing Modem. The FLD-496SA has a removable Phoenix type terminal block on the rear panel for easy connection. The FLD-496SA operates at 9600 Baud. The frequencies used by the host Modem should correspond with a Mark Frequency of 11200 Hz and a Space frequency of 17600 Hz to work correctly. The FLD-496SA-1 operates at 850 nm into Multi-mode cable using ST type connectors. The FLD496SA-2 has 1300 nm single mode LED emitters and detectors and is available with ST or FC type connectors. The Fiber Optic section of the FLD-496SA-1 has a range of about 3-5 Km depending on the connector loses and quality of the cable. The range of the FLD-496SA-2 depends on the power level of the Emitter being used. Power ranges of 21 to 13 dbm are available. The FLD-496SA has two modes of operation: as a Master and as a Remote. In the Master Mode, data from the FSK section is transmitted to both Emitters of the Fiber Optic section. Data from the two Detectors is ORed together and sent to the FSK section. In the Remote Mode of operation, data coming in on Detector 1 is sent to the FSK section and to Emitter 2 where the signal is regenerated and sent on to the next Remote Modem. Data coming upstream from a Remote Modem comes in on Detector 2 and is ORed with data from the FSK section and is transmitted out Emitter 1. The Fiber Optic signal is therefore regenerated. There is no maximum length for a system as long as each hop is less than the maximum range of the FLD-496SA being used. A 9-Volt Lithium battery is used to keep the Fiber Optic section running in the event of a power Failure. A front panel Led indicates that the battery is good when lit and needs to be replaced when dark. A front panel switch allows you to disconnect the battery to prevent it from discharging when the Modem is not being used. The FLD-496SA is normally operated 4 wire full duplex but can also be operated in a 2 wire half duplex mode by setting the appropriate switches on the rear panel. The Local Echo switch is normally off for full duplex and on for half duplex. The FLD-496SA also has anti-streaming capability that can be turned on and off with a dipswitch on the rear panel. Antistreaming prevents a controller from
FLD-496SA 4 continuously transmitting and hogging the fiber. If a controller tries to transmit for more than 7 seconds, the local is shut down. When the Local Controllers starts operating correctly and drops RTS, the Anti-streaming circuit will automatically reset. Anti-streaming is normally not used in the Master Mode because the Master can be transmitting for long periods of time. SPECIFICATIONS Power... 90-135 VAC 50-60Hz < 2 Watts Temperature.....-37 to +74 C Humidity... 5-95% non-condensing Fiber Interface... ST Type Connectors (FC Optional on 1300nm) 850nm Multi-mode Fiber 1300nm Single-mode Fiber FSK SECTION Mark Frequency... 11,200 Hz Space Frequency... 17,600 Hz, Output Level -8 to 0 dbm Adjustable by Pot. Receiver sensitivity... -40 dbm Line Impedance....600 Ohms Modulation... Phase coherent FSK Physical Size...5.75"W x 8.6"D x 1.6"H FIBER SECTION 850 nm (62.5/125 cable) Emitter output....-7 to 16 dbm Receiver sensitivity...-40 dbm max Power budget... 15 dbm Typ. 1300 nm (8.3 Cable) Emitter output... -21 to 13 dbm Receiver sensitivity... -33dBm Power Budget...12 to 20 dbm INSTALLATION The FLD-496SA is very easy to use and install in a system. The only connector on the rear panel is the FSK connector. The 4 pins of the connector are labeled for function in a 4 wire system. For a 2 wire system use the "Out" pins 3 and 4. The switches are labeled on the rear panel. For full duplex operation, the "FULL" switch should be on and "HALF" and "ECHO" switches should be OFF. For Half duplex operation, "FULL" s h o u l d be OFF and "HALF" and "ECHO" should be on. The "ECHO" switch squelches the receiver when transmitting. "MAST" "RMTE" switch selects Master or Remote operation as described earlier. The "MAST" position is usually used for the central computer that controls or interrogates the Local controllers. If you have a point to point system, all of the Modems can be set in the "MAST" position. Data Rate... 9600 bps (Max.)
FLD-496SA 5 The Remote Mode allows daisy chaining the local modems so that the signal is sent down one fiber and back up another fiber to multiple intersections with the signal being regenerated at each local. This allows the use of just a pair of fibers with no restriction on the physical length of the system as long as no individual "hop" is longer than the range of a Modem. The power cord should be plugged into a standard 3-prong receptacle that will supply 90 to 135 VAC 60 Hz. If Battery back up is required, the battery should be installed just before powering up the modem. The battery will start supplying power as soon as it is plugged in and the front panel switch is "ON". Therefore make sure that the Battery switch is in the "OFF" position until the Modem is powered up and installed. The battery will last about 8 hours of power failures. The battery can be tie-wrapped in place through the holes in the board and the holder. The ST and FC connectors for the Fiber Optic cable are on the front panel. NEVER LOOK INTO THE EMITTERS. The Batteries may be supplying power to the emitters. The light from the emitters is in the infrared region of the spectrum and can't be seen by Humans. The light maybe intense enough to damage the retina of the eye. Leave the protectors on unused ports. In the Master Mode of operation, both Emitter 1 and Emitter 2 have the same data on them and this is sent down stream to the Remote or Local controllers. Detector 1 and Detector 2 receive data from the Local or Remote controllers. One set (EMT1, DET1 or EMT2, DET2) can be left unused. In the Remote Mode of operation, data coming down stream from the Master goes in DET1 and is regenerated and sent out EMT2. EMT2 of the first Remote is then connected to the next Remote Modem DET1 in line. Data coming upstream to the Master comes into DET2 on the Remote Modem, is regenerated and sent out EMT1 which is connected to the next Remote going upstream or DET1 or DET2 of the Master Modem. The fiber optic cables cannot be bent sharply. A sharp bend may cause attenuation in the cable or may cause the glass fiber to fracture. The cables attached to the modem should be supported. The only adjustment in the FLD-496SA is an FSK output level located on the PC Board. To adjust the Level Potentiometer you must remove the cover of the FLD- 496SA. The cover can be removed by taking out the two screws on either the front or back panels and removing the panel and then sliding the cover off. Be CAREFUL There is 120 VAC on the Board. Turning the Pot Clockwise increases the output level. Outputs greater than 0 db can be obtained. FLD496SA-2 and used ports If DET 2 of the FLD-496SA-2 is not being used in either a Master or Local/Slave (last Slave in a Line) application, the DET 2 should be disabled. This is done by removing the jumper located inside the case near DET 2. The jumper is connected to R24 and C47. The jumper shunt should be kept on one of the posts of the header so it won't
FLD-496SA 6 be lost and will be available if needed in the future. Disabling the detector will prevent stray noise from getting into the system. The Jumper is only used on the FLD 496SA-2 and not the 1 version. MAINTENANCE The FLD-496SA does not require any normal routine maintenance. The only adjustment inside the FLD-496SA is for Transmit level, which set for 0 dbm at the factory. If the Battery indicator is out, and the Battery Switch is ON, the Battery should be replaced. The Battery being used is a lithium 9 Volt battery. An Alkaline battery can be used but the back-up time will be shorter. We supply an ULTRALEFE U9VL-BP with the modem. A tie-wrap can be used to secure the battery and holder to the board. You should never touch the ends of the fiber optic cables. Dirt and dust can render the cable useless. If the cables need to be cleaned, use reagent grade isopropyl alcohol and/or dry compressed air.
FLD-496SA 7
.
GDI Communications, L.L.C. TRAFFIC ELECTRONICS MANUFACTURER SPECIALIZING IN COMMUNICATIONS 280 1-80 WEST, EXIT 1 P.O. BOX 1330 VERDI, NEVADA 89439 TELEPHONE: (775) 345-8000 FAX: (775) 345-8010