Dewar Electronics Pty. Ltd. - M750 Fibre Optic Interface

M750 Fibre Optic Interface

FEATURES

G703, 64 Kbit co-directional signal channels.
ST connectors for secure connection.
850 to 890 nm multimode fibre cables
1265 to 1380 nm singlemode fibre cables
Isolates communications from ground potential rise and EMI/RFI
Mix and match modules to suit applications.
Only 1U rack height .
Up to 6 individual FOI channels per rack

OVERVIEW

The Dewar M750 Fibre Optic Interface (FOI) was designed to allow simple and easy point to point co-directional G703, 64 Kbit fibre optic communication links for information systems and industrial applications. These units offer a minimum 500 VDC isolation between I/P and O/P data signals and earth.Offering the highest level of reliability the Dewar M750 allows the user a level of flexibility to suit their individual needs. Each FOI utilises a pair of 850 nm multimode fibre optic cables terminated with FC style connectors.

The 19", 1U high case can house up to seven modules. Up to six FOI modules can be powered by one power supply module. This facilitates for mix and match of FOI and power supply modules which allows complete isolation of circuits. Customer can specify module locations at ordering or can locate the module positions within the rack at installation.

SPECIFICATIONS

POWER SUPPLY
Input: 20 to 60, 90 to 180 VDC in two optional modules
Led Indicator power out.
Protection Input fuse, Current Limit, Short circuit

HFD IEC255-22-1 Cl 11.
Impulse IEC255-5 Cl 111
PSU Burden 3 watts max (1.5 typical) per PSU
FO Burden 5 watts max (3.5 typical) per FO Interface

GENERAL
Isolation: 500 VDC between-:
1/ Data Signals and PSU earth.
2/ I/P & O/P Data signals and earth.

Temp. Operating: -5°C to 50°C.
Temp. Storage: -20°C to +85°C.
Relative Humidity: 5% to 95% at +40°C.
non condensing.
Altitude: 0 to 3000 Meters

MECHANICAL
Case: 19" standard rack width x 1U high.
Overall size: 482.6mm x 43.6mm x 160mm depth.

FIBRE OPTIC INTERFACE

Multimode
Receiver: ST, 62.5/125 um fibre cable
Transmitter: ST, 62.5/125 um fibre cable
Wavelength: 810 to 890 nm
Optical Att: 12dB max.Transmitter to Receiver.
Up to 2 kms depending on cable quality

Singlemode
Receiver: ST, 9/125 um fibre cable
Transmitter: ST, 9/125 um fibre cable
Wavelength: 1265 to 1380 nm
Optical Att: 12dB max.Transmitter to Receiver.
Up to 20 kms depending on cable quality

G703 ELECTRICAL CONNECTION
Co-Directional: G703, 64KBit
Termination: 120 ohm
Response delay: < 500nSec
Led Indicators: Data Signal present. Rx & Tx.
Power.

APPLICATION

INSTALLATION: M750 FIBRE OPTIC INTERFACE

The M750 case is designed to be installed into a standard 19” (482.6 mm) wide rack of minimum 1U height (44.45 mm). The end brackets form part of the case. Mounting hardware is not supplied.

All connections are made to the rear of the case assembly. It is suggested a minimum distance of 150 mm be allowed at the case rear for ease of cable connections. FOI and PSU modules are assembled on the same footprint. Up to seven modules can be mounted in a single case. Up to six FOI modules can be powered by one PSU. Due to power connection needs, the extreme left module as seen from the front can only house a PSU card. A PSU must always be mounted to the left of the FOI module(s).

A tally plate is provided to allow the installer to identify the position of each module.
LED Indicators. A green LED indicates power output from the PSU and power applied to a fitted FOI. module. Yellow LED’s indicate data transmit and receive.

Connection	All connections viewed from rear of case
Fibre Optic	As shown. Receiver and transmitter cables needed are ST style. The fibre optic mating connectors are user supplied. Extreme care should be taken when making fibre optic connections.
Wire	Solid or stranded. Up to 2.5sq mm
Electrical :	As shown . All mating connectors are supplied. (Phoenix P/N MSTBA-2.5/4-ST)
Power Supply:	As shown. The mating connector is supplied. (Phoenix P/N GMSTBA-2.5/3-ST)

Ordering. (Example)

Rack Case M750 Power Supply. P1 = 20 TO 60 VDC P2 = 90 TO 150 VDC P3 = 200 TO 300 VDC Fibre Optic Interface FM = F.O.I Multimode FS = F.O.I Singlemode X = Blank	Model No. M750 - 1 M750 - 21 M750 - 22 M750 - 23 M750 - 3 M750 - 5