Network Configurations
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002) 5-13
5.1.5 Star Network via the MD2-internal Two-way Transformer,
2-wire Half-duplex
Overview
Fig. 5-5 shows a configuration for a star network, 2-wire half-duplex. The MD2
modem on the left represents a 2 x 2-wire terminal point which uses the two-way
transformer integrated in the MD2 to connect a small star network consisting of two
2-wire dedicated lines: 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.
Note that the DIL switch settings on all three modems are different due to their
location in the star network: one is a 2 x 2-wire terminal point (see Table 5-8), one
is a 2-wire terminal point (see Table 5-9) and the last one is a 2-wire tapping point
(see Table 5-10).
Fig. 5-5 Network configuration: star network via the MD2-internal two-way transformer, 2-wire half-
duplex
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