2.2.2
Digital FO Transmitter and Receiver Modules
FO transmitter/receiver pairs used to pass digital signals shall accept
inputs and provide outputs compatible with [EIA ANSI/EIA/TIA-232-F] [EIA
ANSI/TIA/EIA-485-A] [20 mA current loop] [T1] [10 Base-F]. Digital data
rates through each link shall be [9.6 KBPS] [19.2 KBPS] [38.4 KBPS] [1.54
MBPS] [10 MBPS]. FO transmitter and receiver modules shall be housed [in
field equipment enclosures where possible] [in new enclosures] [as shown].
FO transmitter and receiver modules shall be compatible with each other,
the FO cable, and connectors.
2.2.3
FO Transmitter Module
The FO transmitter module shall accept electronic signals and shall
modulate a light source. The light source shall be coupled into an FO
cable. The operating wavelength shall be centered on [850] [1300] [1550]
[850 and 1300] [1300 and 1550] nanometers.
2.2.4
FO Receiver Module
The FO receiver module shall receive light from the FO cable and shall
convert this light into an electronic signal identical to the electronic
signal applied to the FO transmitter module. The operating wavelength
shall be the same as the transmitter.
2.3
FO DIGITAL REPEATERS
FO digital repeaters shall be used to extend the range of the FO data
transmission system when necessary to meet the requirements of paragraph
SYSTEM REQUIREMENTS. For simplex circuits, the repeater shall consist of
an FO receiver connected to an FO transmitter. For Duplex circuits, the
repeater shall consist of a pair of FO receivers that are connected to a
pair of FO transmitters. The FO receivers shall receive the optical signal
and drive the transmitters. The transmitters shall regenerate the optical
signal at the transmission rate specified. The FO repeater shall be
mechanically and optically compatible with the remainder of the FO system.
2.4
FO ANALOG REPEATERS
FO analog repeaters shall be used to extend the range of the FO data
transmission system when necessary to meet the requirements of the
paragraph SYSTEM REQUIREMENTS. For simplex circuits, the repeater shall
consist of an FO receiver connected to an FO transmitter. For duplex
circuits, the repeater shall consist of a pair of FO receivers that are
connected to a pair of FO transmitters. The FO receivers shall receive the
optical signal and drive the transmitters. The transmitters shall
regenerate the optical signal in compliance with EIA 170. The FO repeater
shall be mechanically and optically compatible with the remainder of the FO
system.
2.5
TRANSCEIVERS FOR VIDEO APPLICATIONS
FO Transceivers shall allow bi-directional signal transmission on a single
fiber. The operating wavelength in one direction shall be 1300/850
nonometers, while in the opposite direction it shall be 850/1300
nanometers. Crosstalk attenuation between channels shall be 40 dB or
greater. FO transceivers shall be selected to match or exceed the highest
data rate of attached input devices. The FO transceiver shall be
mechanically and optically compatible with the remainder of the FO system.
SECTION 16768A
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