Black Box Modem Fiber Optic Modem User Manual download pdf (Page 4)

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: [email protected]

Table 4: Operating Parameters

Parameter Min. Typical Max. Conditions

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.

Figure 4: MED100A Circuit Diagram

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