2.6
TRANSCEIVERS FOR LAN APPLICATIONS
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NOTE: Designer will use the transceivers for ESS or
UMCS systems which use a LAN topology for
communication.
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Transceivers for FO LAN applications shall be active units, compatible with
the LAN cards, modems and repeaters used in the system. Indicators
provided shall be for power, collision detection, receive, transmit, and
status. Power for transceivers shall be derived from the Attachment Unit
Interface (AUI) port of LAN equipment or from a dedicated power supply.
Transceiver loss characteristics shall be less than 1.0 db. Connectors
shall be low loss and compatible with LAN equipment. Circuitry shall be
included so when a device is disconnected, other devices on the LAN
continue to operate without any disruption.
2.7
FO SWITCHES
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NOTE: Designer will show FO switches and designate
latching or nonlatching on contract drawings.
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FO switches shall be single pole, double throw. Switching speed shall be
less than 15 milliseconds. Insertion loss shall be less than 1.5 dB.
Crosstalk attenuation between FO outputs shall be 40 dB or greater. FO
switches shall be latching or nonlatching as shown.
2.8
FO SPLITTER/COMBINER
FO splitter/combiner units shall provide full-duplex communications in a
multi-point configuration. Each unit shall have one input port module and
up to four output port modules. FO splitter/combiner units shall be
mechanically and optically compatible with the remainder of the FO system.
The splitter/combiner shall allow a mixed configuration of port module
operating wavelengths and single-mode or multimode FO cables. Each port
module shall have a separate FO cable input and output. Port modules shall
be connected using an electronic data bus. Port module FO transmitters
shall regenerate the optical signal at the transmission rate specified.
Port modules shall be rack-mounted in a 483 mm 19 inch rack complying with
EIA ANSI/EIA-310-D. The total propagation delay through the
splitter/combiner shall be less than 100 nanoseconds.
2.9
FIBER OPTIC DIGITAL REPEATERS (FODR)
FODRs shall combine the features specified for Fiber Optic Digital
Repeaters and Local Area Network (LAN) transceivers. FODRs shall
regenerate the optical signal at the transmission rate specified. The
FODRs shall be mechanically and optically compatible with the remainder of
the Fiber Optic System. FODRs shall restore the optical signals amplitude,
timing and waveform. The FODR shall provide an electrical interface to the
transmission media. The electrical interface shall be identical to all
other network interfaces as specified.
SECTION 16768A
Page 20
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