Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
2.7 MULTIPLEXER, INTERNAL CONNECTIONS ON THE MOTHERBOARD
Figure 2-24 is a simplified functional diagram of the internal connections of an IMUX 2000
Multiplexer using an electrical E1 interface. Figure 2-25 shows the connections of an IMUX 2000
Multiplexer using an fiber optic interface.
All modules, Module Adapters, and rear panel connectors communicate with each other through the
signal and power buses on the motherboard. Input power enters at the rear-panel terminal block and
passes to the power supply module. The power supply output goes to the power bus, from which the
Common Module and each channel module draw current as needed. Power supplies from the signaling
battery and ring generator, if used, also connect to the power bus.
The signal bus is actually comprised of four buses: "TX A," "RX A," "TX B," and "RX B." In a
terminal multiplexer, the channel modules place their transmit signals on the TX A bus. The E1
Common Module takes these signals and multiplexes them together for transmission on the E1 line. It
also takes the incoming E1 signal, demultiplexes it, and places the resulting channel signals on the RX
B bus, from which the channel modules take their individual receive data.
In a drop/insert multiplexer, the channel modules set to transmit in direction A and the CM4
designated as DI-A work together in a terminal multiplexer. However, the channel modules set to
transmit in the B direction work together with the CM4 designated as DI-B, using the TX-B bus and
the RX-A bus.
This topic is discussed further in Section 4 of this manual.
IMUX 2000E1 RFL Electronics Inc.
April 1, 2007 2-47 (973) 334-3100
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