Siemens SINAUT ST7 - Star Network Via an External Multiple Transformer, 4-Wire Full-Duplex

Network Configurations
© Siemens AG 2002 All Rights Reserved 6NH7811-0AA22
MD2 Modem (07/2002) 5-21
5.1.7 Star Network via an External Multiple Transformer,
4-wire Full-duplex
Overview
Fig. 5-7 shows a configuration for a star network, 4-wire full-duplex.
The MD2 modem on the left represents a 4-wire terminal point to which two
multiple transformers (in this example these are two 4-way transformers) are
connected. The left multiple transformer provides 4 channels for the receiving
direction, the right one 4 channels for the sending direction. Multidrop lines or
point-to-point connections can be connected via the available four 4-wire lines.
The modem is set to the "Normal" operating mode. Table 5-14 shows all the settings
necessary on the MD2 modem and the LTOP2s.
Fig. 5-7 Network configuration: star network via an external multiple transformer, 4-wire full-duplex
DTE
TIM3V/4
LTOP2
MD2
RS232
LTOP2
overvoltage
protection
6NH9821-0BC12
4 x 4-wire-
dedicated
line
1. 2. 3. 4.
Cable
6NH7700-2AR60
Connection to
4-way transformer
requires adaptation
see Table 5-15
LTOP2
600
Ω
4 x 600Ω
600
Ω
4 x 600Ω
LTOP2
LTOP2
Multiple transformer
for receiving direction
Multiple transformer
for sending direction
4-way transformer
6NH9812-4GA
Note: only suitable
for 1200 or 2400 bps