CANOGA PERKINS 2370 High-Speed Universal Fiber Optic Modem - Manual (Page 10)

EdgeAccess Universal Chassis System
Model 2370 Model User Manual 1-2
Figure 1. Model 2370 Modem
1.1 Modem Operation
The electrical connection between the network equipment and the 2370 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 2370 operates asynchronously at up to 15 Mbps and synchronously at up to 20 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.