Mitel 3300 ICP Technician's Handbook page 20

3300 ICP Technician's Handbook – Release 3.2
Fiber Interface Module Specifications (9400-300-301-NA)
Fiber optic cable type
Notes:
1. The run length is the one-way length of fiber optic cable between
nodes.
2. ST is a registered trademark of AT&T.
3. Some channels of the electrical interface are not available.
4. The optical budget is the allowable loss through fiber optic cable,
splices, and connectors. The optical budget applies to the run length.
Operation
The FIM has three functional sections: a transmitter, a receiver, and
a control section.
The transmitter section accepts data from the node in which it is
installed. The data is converted to byte-interleaved format, and a
checksum is calculated. The checksum byte is combined with the
data and the frame synchronization information. The frame is
encoded as serial data and transmitted on the fiber.
The receiver section converts the incoming data to parallel format,
extracts the frame synchronization information, and decodes the
data. Control and status information is extracted and further
decoded. The checksum is verified and an error counter updated.
The status information and data are combined, frame-aligned, and
re-formatted for output.
The control section generates control signals and the transmit
clocks. This section also regenerates the telephony clocks for the
peripheral nodes, and provides status information for the Main
Controller.
Two LEDs indicate the detection of local and remote clocks.
62.5/125 um Multimode
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