Black Box Fiber Optic Modem manual Operating Parameters, MED100A Circuit Diagram

MED100A 304 pg. 4 / 4 6132-r1

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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