903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 2-10
2.4 Optical Configuration
The optical configuration of a 4VID and 8VID dual fiber systems is shown in the figure below.
WDM
SPLITTER
WDM
FIBER
SWITCH
ST (FC OPTIONAL)
LC-LC
LC-LC
SMF-28 FIBER
FIBER SYSTEM (FORJ, FIBER,
CONNECTORS, JUNCTION BOXES)
SMF-28 FIBER
REMOTE MODULE FMB-X-2.5-R
CONSOLE MODULE FMB-X-2.5-C
ST
(FC OPTIONAL)
SFP
TXVR
LC
LC
SFP
TXVR
LC
LC
TX 1310 nm
RX 1550 nm
TX 1550 nm
RX 1310 nm
Figure 2-7: Model 903 Dual Fiber Optic Transmission System (4VID, 8VID)
The FMB-X-2.5R card in the remote subrack optically multiplexes the 1310 nm uplink and 1550 nm downlink
on the same fiber with a standard 1310/1550 nm WDM. A second 1310/1550 nm WDM at the FMB-X-2.5C
card multiplexes the uplink and downlink to the receiver and transmitter respectively.
The remote FMB-X-2.5R includes an optical splitter to provide redundant signals over two separate
singlemode fibers. At the console module, one of the two fibers for each link is selected by the fiber switch
integrated with the FMB-X-2.5-C located in slot C. Hence the downlink is only present on one fiber at a time.
The fiber switching can be performed automatically or manually, depending on the position of the toggle
switch on the front panel of the FMB-X-2.5C card. Refer to section 3.1.2 for more information about the
FMB-X-2.5C.
Содержание Focal 903
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