Fiber Interface Module; Genera; Functions; Electrical Description - Mitel SX-200 Practices

17
' FIBER INTERFACE MODULE
General
17.-l The Fiber Interface Module (FIM) provides a fiber optic based communications link
between the Control Cabinet and the Peripheral Cabinets or Bays of the SX-2UO FD
system. One FIM connects to the Peripheral FIM Carrier located in each Peripheral
Cabinet. Up to seven FlMs are connected to the two Quad FIM Carriers located in
the Control Cabinet,
The FIM measures 114.3 mm x 105 mm (4.5 in. x 4.14 in.).
Functions
17.2 The FIM consists of three functional sections:
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a Transmit Section
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a Receive Section
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a Control Section.
Electrical Description
17.3 The Transmitter Section accepts data in serial format. Data is converted to byte
interleaved format and a checksum byte and overhead information is added along
with frame syncronization. Parallel data is converted to serial form and encoded.
The optical interface converts the serial data to light and transmits it on the fiber.
The Receiver extracts the bit clock from the incomming serial data, converts the data
to parallel, and extracts frame sync. After the data is decoded, the status information
and the data are combined, frame alligned and reformatted for output.
The Control Section generates control signals, the transmit clock (bit clock), and
regenerates the telephony clocks for the Peripheral Cabinet (Bays) and provides status
information for the Control Cabinet.
Cabling
17.4 Two fiber optic cables are connected to each FIM. One cable is used for TX
(transmit) and the other for Rx (receive). The cables are 62.5/125 pm Glass
Multi-mode and use ST Connector systems. The fiber optic links are operable up to
one km.
9109-096-I 25-NA Issue 1
Revision
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