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Specifications 

 

Power 

Wall-mount Power Supply, 100-240 VAC/47-63 Hz Input, 
5 VDC, 1.2 Amp Output, UL/CUL

 

 

Interface 

EIA RS-232-C; CCITT V.24, V.28; ISO 2110 
 

Flow Control 

Will pass XON/XOFF only. 
 

Size 

1”H x 2.7”W x 4.2”L 
 

Weight

  

1.4 lb. includes supply 
 

Data Rate 

Transparent to rates up to 76.8 kbps (high/low speed jumper) 
 

Data Format 

Asynchronous, Bi-Directional 
 

Connectors 

(1) - DB25 female or male, (2) - fiber optic ST 

 
Switches 

(1) - DCE/DTE toggle 

 
Fiber Optic Wavelength 

850 nm 

 
Receiver Sensitivity 

Typical: 3 uW / -25.2 dBm 

 

Transmitter Coupled Power 

Actual coupled power varies in fiber optic applications due to mechanical alignment of components and/or 
connector and optical fiber tolerances. The Fiber Driver provides a range select feature that allows the user to 
compensate for these variations as needed. 
 

Table 1.1 - Transmitter Coupled Power Settings (W3) 

 

cable type 

W3=A (short range) 

(uW/dBm) 

W3=B (medium range) 

(uW/dBm) 

W3=C (long range) 

(uW/dBm) 

multimode 
50/125 um 

4.0/-24.0 

12.0/-19.2 

20.0/-17.0 

multimode 
62.5/125 um 

10.0/-20.0 

28.0/-15.5 

46.0/-13.4 

Multimode 
100/140 um 

24.0/-16.2 

72.0/-11.4 

120/-9.2 

 
(NOTE: Set jumper W3 to the lowest power setting for your application to avoid saturating the far-end unit’s 
receiver.) 

Summary of Contents for MD940A-F

Page 1: ...ER CUSTOMER SUPPORT INFORMATION Order toll free in the U S 877 877 BBOX outside U S call 724 746 5500 FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com ...

Page 2: ...25 2 dBm Transmitter Coupled Power Actual coupled power varies in fiber optic applications due to mechanical alignment of components and or connector and optical fiber tolerances The Fiber Driver provides a range select feature that allows the user to compensate for these variations as needed Table 1 1 Transmitter Coupled Power Settings W3 cable type W3 A short range uW dBm W3 B medium range uW dB...

Page 3: ...g the Fiber Drivers Remove the two screws and lift off the cover to access the internal configuration jumpers on the Fiber Driver Set jumpers W1 W2 and W3 as appropriate for your application see Figure 3 1 and Table 3 1 Reinstall the cover and then set toggle switch S1 for either DTE to connect to a PC or DCE to connect to a modem Connect the two fiber drivers using multi mode fiber optic cables w...

Page 4: ...pen DCE Data Carrier Equipment DTE Data Terminal Equipment Set toggle switch S1 for either DTE to connect to a PC or DCE to connect to a modem Note 1 Pin 6 DSR is pulled to 5 volts through jumper W1 Please see Table 3 1 for details Troubleshooting If the Fiber Drivers fail to operate check the following before calling for technical support 1 Are both units powered on Check to see if the power supp...

Page 5: ...dential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for radio noise emissi...

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