Model 2557

RS-232 Asynchronous to Fiber Mini Modem

• 50 to 115 Kbps asynchronous operation on fiber optic cable, simplex or full duplex operation
• 1000 ft (300 m) distance capability.
• 0 to 50°C operating range
• ST connector receptacles (SMA option)
• DTE or DCE switch selectable
• Mini Bit-Driver is powered by DTE (RS-232 Self-powered)
• LED indicators for transmit and receive data
• Male or female RS-232C (V.24) connectors

Specifications

Operation Mode:	Asynchronous, simplex or full duplex
Input/Output Interface:	RS-232-C, Type D Asynchronous to 115.0 Kbps, connects directly to Terminal (RS-232 cable not required)
Transmission Line Interface:	ST connector is standard for interfacing with fiber optic duplex cable. (SMA option).
Transmission Distance:	1000 ft. (300 m)
Optical Power into a 50 Micron Core Optical Fiber:	0.5microwatts, 10 dB power budget @ 820 nanometers.
Receiver Sensitivity:	50 nanowatts at less than 10-9 bit error rate
Operating Temperature:	0°C to 50°C
Input Power:	Host supplied or Pin 9
Size:	1.75 x 3 x 0.625 in (4.5 x 7.5 x 1.6 cm)
Enclosure:	Metal Enclosure
Weight:	0.25 lb (100 grams)

DB-9F RS - 485 9 PIN CONNECTOR - FEMALE
PINS UTILIZED BY 2117 MINI MODEM

1*	AA	Protective Ground	Chas. Gnd
2	BA	Transmitted Data	TXD
3	BB	Received Data	RXD
4*	CA	Request to Send	RTS
5*	CB	Clear to Send	CTS
6**	CC	Data Set Ready	DSR
7*	AB	Signal Ground	Sig. Gnd
8**	CF	Data Carrier Detect	DCD
9		Positive 5 VDC Input	+5VDC
20**	CD	Data Terminal Ready	DTR

Operating Distance for Fiber Optic Cable

Fiber Size	Attenuation	Distance	Distance
(Microns)	dB/Km	Meters*	Feet*
50	3	2000	6600
62.5	4	2000	6600

* High Power Option Available