CANOGA PERKINS 2340 Universal Fiber Optic Modem - Manual (Page 10)

Model 2340 Model User Manual 1-2
Figure 1. Model 2340 Modem
1.1 Modem Operation
The electrical connection between the network equipment and the 2340 differs according to the
electrical line interface module (ELIM). The conversion between electrical and optical signals is
similar in all applications. The modem multiplexes the clock, data, and control lead inputs from the
ELIM, then adds framing and supervisory information. The optical receiver extracts the clock and
data information from the optical signal, establishes the frame-bit lock, then demultiplexes the clock,
data, control signals, and routes the signals to the interface circuits.
The 2340 operates asynchronously at up to 1.5 Mbps and synchronously at up to 2.048 Mbps.
Operation mode options include external, internal, and slave timing. The built-in clock can generate
the common clock rates, including most Nx56/Nx64K rates.