Black Box Fiber Optic Modem Manual De Usuario

MED100A 304 pg. 4 / 4 

6132-r1

 

Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018 

Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746 

To contact us about Black Box products or services: 

info@blackbox.com

 

 

Data Rates (RS-232 Operation) 

0 bps 

 

115.2 kbps   

Data Rates (RS-422/485 Operation) 

0 bps 

 

500 kbps 

 

Power Supply Voltage 

10 VDC  12 VDC 

30 VDC 

 

Power Supply Current Draw 

 

 

140 mA 

Full RS-485 Termination 

Optic Wavelength 

 

820 nm 

 

 

Fiber TX Launch Power 

-17 dBm  -13 dBm 

-10 dBm 

 

Minimum Required Fiber Rx Power 

 

-25.4 dBm  -24 dBm 

 

Maximum Receiver Power 

 

 

-10 dBm 

 

Coupled Power Budget 

 

12.1 dB 

 

 

Fiber Range 

 

2.5 miles   

 

End to End Delay 

 

2000 ns 

2650 ns 

Point-to-Point RS-232 Operation (See Notes 1 & 2) 

End to End Delay 

 

550 ns 

1000 ns 

Point-to-Point RS-422/485 Operation (See Notes 1 & 2) 

End to End Skew 

 

900 ns 

1100 ns 

Point-to-Point RS-232 Operation (See Note 3) 

End to End Skew 

 

50 ns 

120 ns 

Point-to-Point RS-422/485 Operation (See Note 3) 

Maximum Total Fiber Ring Length 

 

 

5 Miles 

(See Note 1) 

Delay between Rx & Tx on a fiber ring  52 µs 

 

 

(See Note 4) 

 

Note 1: For the total transmission time over long fibers, the time to transverse the fiber must be considered if delay is an issue. Light takes about 8.05 microseconds to travel over 1 mile of fiber. 
Note 2: When operating in a ring configuration, each node in addition to the two in the point-to-point specification adds an additional 100 to 200 nanoseconds of delay. 
Note 3: When operating in a ring configuration, each node in addition to the two in the point-to-point specification adds an additional 50 to 70 nanoseconds of skew. 

 

Note 4: When operating in a ring configuration, each serial device must wait at least this minimum time between receiving data from the ring and transmitting back on to it.