Optical Transceivers; Fiber Optic Receiver - Motorola MPMC221 Installation And Use Manual

Introduction
1

Optical Transceivers

Fiber Optic Receiver

1-10
Station is
operational
Normal
Function
Primary ring
Secondary ring
Figure 1-4. Station Bypass Operation
The MPMC222 uses two optical transceivers for connection to an
FDDI dual ring. Each optical transceiver consists of one fiber optic
receiver and one fiber optic transmitter. On the adapter, each
transceiver typically connects to the FDDI LAN through an optical
bypass relay. The MPMC221 has only one optical transceiver and
therefore can not be used with an optical bypass relay.
The fiber optic receiver consists of a PIN diode, amplifier, equalizer,
automatic gain circuit, and comparator. The PIN diode receives an
optical signal from the fiber and converts it to an electrical
waveform. The signal is then amplified and conditioned. The
conditioned waveform is then passed through a comparator which
determines the logical output. The resulting bit stream is fed to the
PHY with a pair of differential drivers.
Station
has a failure
Optical
Bypass
Relays
Network
Bypass
Function
11719 9701