FDM2-Fiber Hub / Fiber Optic Digital Modem
|Four Port Optical Star|
|Intuitive Ring Status Display|
|ROS Memory System utilized to provide
|Configurable Multiple Fiber Topology|
|Immune to optical overloads|
|Key-on-data (KOD) functionality|
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The FDM2-Fiberhub is part of the
Modem series and provides active
bi-directional, optical star communications to three optical ports. The
FDM2-Fiberhubs can be ganged together either optically or electrically to
provide further expansion. Two Auxiliary Data Ports are provided with full
handshaking and Anti-Streaming capabilities. As with all FDM Series it shares
the unique capabilities of being operated in many other topologies such as Point
to Point, Daisy Chain and Dual Redundant Ring Formats. The FDM2-Fiberhub
is 100% compatible with all modems in the FDM Series, e.g. FDM1SA Stand Alone,
FDM170 Plug-in for the 170 Controller and the FDM2070-6D Plug-in for the 2070
A typical FDM2-Fiberhub application would be in a
Daisy Chain or Dual Redundant Ring format at a point where two arterials, main
and secondary intersect. The requirement here is to tie in the secondary optical
branch circuits into the main arterial fiber trunk. Another feature is the
two Auxiliary Data Ports that can operate as a DTE or DCE with full handshaking.
Connect one of these data ports into the local controller plus add in
another data branch circuit such as a Spread Spectrum Radio to bring in that
orphaned controller on line.
The FDM2-Fiberhub represents a new generation of
fiber optic modems utilizing a Replaceable Operating System. As ITS requirements
change, or new features become available, a new ROS Memory System can be created
so as to provide a Migration Path to upgrade the existing system.
When the FDM2-Fiberhub is operated in the DCRR
format, it supports redundant communications paths, any single point of failure
such as a modem failure or fiber cable cut, the system will automatically self
heal around the point of failure making it the ideal choice for critical data
Each modem has an Intuitive Ring Status Display
that graphically mimics the switching status of the modem providing instant
recognition as to the switching state of the modem and the ring system. Should a
fold-back occur at a modem the display shows a pictorial view of the fold-back,
its direction and all the other modems receive notification of this condition
and flash the fold-back indication on their screens.
Automatic Receive Fiber Identification will
flash either a 1 or 2 to identify the Ring 1 or Ring 2 fiber.
The Modem can operate over Multimode or
Singlemode fibers, is immune to optical overloads and therefore does not require
the insertion of optical attenuators. The modems ergonomic design has no
internal adjustments and all connections, adjustable options and their labeling
are on the external surfaces of the modem.
Activating the KOD function sets the FiberHub’s
auxiliary data port(s) to act as a DTE device. Signals based on data received
from the fiber system will generate an RTS handshake. This unique Key-On-Data
capability is essential for communicating with a communications device that
requires active RTS/CTS handshaking from a DTE device.
Anti-Streaming times are computer generated in precise, digitally programmed, 2
seconds increments starting from a base of 2 seconds to a maximum of 126 seconds
to meet the demands for systems that require precise timing schemes.
Standalone Aux Data Port 1 DB9F Aux Data Port 2 RJ45 RS232/485/422
Data Rate Up to 115.2 Kbps (Asynchronous) Bit Error Rate Better than 1x10-9
within specified dynamic range MTBF In excess of 100,000 Hrs Control Lines RTS,
Connectors ST, FC, SC
Dynamic Range 12db @ 1300nm MM. (Minimum) 24db @ 1310nm SM.
USER ADJUSTABLE OPTIONS
Anti-Streaming Clear (push button)
Note: The anti-streaming feature clears automatically when a normal condition
returns but the ERROR indicator stays on until cleared manually with the front
panel push button.
Daisy Chain Daisy Chain Configuration 2 Rings/1 Ring Ring configuration
RS232/RS485 Data port operation selection RTS/CTS On/off CTS Delay time
selection (0 or 8 ms) KOD RTS, Data Delay Anti-Streaming On/Off Anti-streaming
Adjustable in 2 second increments from 2 to 126 seconds Data Rate Switch
selectable 1200, 2400, 9600, 19200, 38400 56700, 115200 Bps Parity None, Odd, or
INDICATORS Front Panel
TX DATA Transmit RS232/485/422 RX DATA Received RS232/485/422 ANTI-STRM
Anti–Streaming PWR DC Power FIBER STATUS Dual seven segment display
Stand Alone 2.306” W x 6.15” H x 8” D
Stand Alone 18-30 VDC
Optional External 115 VAC Supply External 220-240 VAC Battery Back-up (six
Temperature -37 to +74o C Humidity 95% non-condensing