American Fibertek RR-92485SL - Manual (Page 3)

3
INSTALLATION AND OPERATION INSTRUCTIONS
INTRODUCTION
Thank you for purchasing your American Fibertek Series 92485SL singlemode twenty-four
channel video multiplexer with bi-directional multi-protocol data. Please take a few minutes to
read these installation instructions in order to obtain the maximum performance from this
product.
FUNCTIONAL DESCRIPTION
The 92485SL Series units operate as a transmitter / receiver pair for the digital transmission of
twenty-four simultaneous NTSC or PAL video signals along with two channels of field
configurable bi-directional data over one singlemode fiber optic cable. These data channels may
be configured as RS485 data, RS422 data, RS232 data, or Manchester data. The RS485
channel may be configured for 2-wire (half duplex) or 4-wire (full duplex) with or without biasing.
Switch selectable internal 120 ohm terminations are available for RS422 or RS485 data.
NOTE: This unit is shipped with Data Channel 1 and Data Channel 2 in the RS485 4-wire
configuration. For other configurations, please refer to the DATA MODE section for
changes to the default switch settings.
NOTE: This unit is shipped with data terminations off and data bias off for Data Channel
1 and Data Channel 2. For other configurations, please refer to the DATA TERMINATION /
BIAS section for changes to the default switch settings.
The RT-92485SL transmitter accepts up to twenty-four video inputs in three groups containing
eight videos and multiplexes each group into a high speed serial data stream. The first group’s
serial data stream modulates a laser at 1510nm wavelength. The second group’s serial data
stream modulates a laser at 1530nm wavelength. The third group’s serial data stream
modulates a laser at 1550nm wavelength. A Course Wave Division Multiplexer (CWDM)
combines these three wavelengths, along with the forward data wavelength of 1490nm and the
return data wavelength of 1470nm, onto a single optical output port for connection to the fiber
transmission system. Correspondingly, the RR-92485SL receiver converts the optical signal into
twenty-four independent video output signals and two forward data channels while transmitting
the two return data channels.
The 92485SL Series product is designed to operate over an optical loss budget range of 0dB to
21dB on 9um singlemode fiber. Refer to the product specification sheet for additional
performance data.