Network Configurations
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002) 5-17
5.1.6 Star Network via an External Multiple Transformer,
2-wire Half-duplex
Overview
Fig. 5-6 shows a configuration for a star network, 2-wire half-duplex.
The MD2 modem on the left represents a 2-wire terminal point to which a multiple
transformer (in this example a 4-way transformer) is connected to connect a star
network consisting of up to four 2-wire dedicated lines. In Fig. 5-6 only two
dedicated lines are shown: the first 2-wire dedicated line is a multidrop line, the
second 2-wire dedicated line is a point-to-point connection.
The MD2 on the right is a 2-wire tapping point, the MD2 modem in the middle is a
2-wire terminal point. All three modems are set to the "Normal" operating mode.
All available baud rates and character recognition methods can be used in this
configuration. However, the 4-way transformer 6NH9812-4GA shown in Fig. 5-6 is
only suitable for 1200 or 2400 bps.
Fig. 5-6 Network configuration: star network via an external multiple transformer, 2-wire half-duplex
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